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Home My WebLink About484 Willow Stormwater Management Report Narrative_Signed Project xxxxxxx 440 North Wells Street | Suite 320 | Chicago, Illinois 60654 312.324.5500 | fax 319.364.4251 | shive-hattery.com Stormwater Management Report Eversource Energy Yarmouth – ERP Staging Lot Yarmouth, MA | January 19th, 2022 Prepared For: Eversource Energy 484 Willow Street Yarmouth, MA 02673 Shive-Hattery Project Number: 3172201210 Shive-Hattery Project Number: xxxxxxx Page 1 of 16 Project 3172201210 | Date – January 19th, 2022 Table of Contents Page List of Appendices .......................................................................................................................... 2 1. Project Narrative .................................................................................................................... 3 a. Project Description ................................................................................................................. 3 b. Pre-Development Conditions ................................................................................................. 3 c. Post-Development Conditions ................................................................................................ 4 d. Construction Sequence .......................................................................................................... 4 2. Mass DEP Stormwater Management Standards ..................................................................... 5 a. Standard 1 – New Stormwater Discharges ............................................................................. 5 b. Standard 2 – Stormwater Runoff Rates .................................................................................. 5 i. Infiltration Basin Sizing ........................................................................................................... 5 ii. Storm Sewer Sizing ............................................................................................................. 10 c. Standard 3 – Groundwater Recharge Volume ...................................................................... 11 d. Standard 4 – Water Quality & TSS Removal ........................................................................ 13 i. Required Water Quality Volume and TSS Removal .............................................................. 13 ii. Long-term Pollution Prevention Plan .................................................................................... 14 e. Standard 5 – Land Uses with Higher Potential Pollutant Loads (LUHPPLs) .......................... 14 f. Standard 6 – Critical Areas .................................................................................................. 14 g. Standard 7 – Redevelopment Projects ................................................................................. 15 h. Standard 8 – Erosion and Sedimentation Control Plan ......................................................... 15 i. Standard 9 – Operation and Maintenance Plan .................................................................... 15 j. Standard 10 – Prohibition of Illicit Discharges ....................................................................... 15 3. Yarmouth Stormwater Management Performance Standards ............................................... 15 a. Low Impact Development (LID) ............................................................................................ 15 b. Good Housekeeping Procedures ......................................................................................... 15 c. Stormwater Management Systems....................................................................................... 16 i. Post-Development Peak Discharge rates ............................................................................. 16 ii. Structural Pretreatment ........................................................................................................ 16 iii. Precipitation Data ................................................................................................................ 16 d. Stormwater Management Systems for New Development .................................................... 16 e. Stormwater Management Systems for Redevelopment ........................................................ 16 f. BMP Performance ............................................................................................................... 16 g. Discharges to Impaired Water Bodies .................................................................................. 16 Page 2 of 16 Project 3172201210 | Date – January 19th, 2022 List of Appendices Appendix A – USGS Location Map Appendix B – FEMA Map Appendix C – NRCS Web Soil Survey Map Appendix D – Pre-Development and Post-Development Stormwater Exhibits Appendix E – CN and Time of Concentration Calculations Appendix F – NOAA Rainfall Data Appendix G – TSS Removal Calculations & Hydrodynamic Separator Appendix H – Basin Sizing SewerGEMS Output Appendix I – Storm Sewer SewerGEMS Output Appendix J – Soil Borings Appendix K – Operation and Maintenance Plan Appendix L – Erosion & Sediment Control Plan (prepared by others) Appendix M – Massachusetts DEP Stormwater Checklist Page 3 of 16 Project 3172201210 | Date – January 19th, 2022 1. Project Narrative a. Project Description This project involves constructing a vehicle staging lot at 484 Willow Street, Yarmouth, MA 02673. The staging lot will be used to assist Eversource Energy in restoring utility service during emergency response situations. Vehicles and resources are brought in from other locations to assist with the response when there are large outages. It serves as a place to organize the additional resources. During normal times the lot will remain empty. The project area is approximately 4.38 acres with about 4.12 acres being disturbed by the activities of this project. In addition to constructing the staging lot, storm sewer and infiltration basins will be installed to manage stormwater runoff. Site lighting, landscaping, fencing, and a fire hydrant will also be installed. Demolition work includes tree removal, clearing and grubbing the wooded area, and fence removal. North of the project limits is the existing Eversource Energy facilities. To the east is a wooded area. To the south is an existing development and a wooded area. West of the project area is the Cape Cod Gateway Airport. The site and adjacent properties are zoned B3 Business and R.O.A.D. Overlay district. b. Pre-Development Conditions In the existing conditions, the project’s 4.38 acres are primarily covered in woods. The existing grades varies throughout the site. There are several high points and low points within the project area. By studying the topographic survey and existing grades, it appears all existing runoff from the project site meanders off-site through various existing drainage paths and eventually discharges to an upstream tributary of Hawes Run/Mill Creek, which is east of the project limits. For analysis purposes, the existing conditions have three drainage areas: Drainage Area 1, 2, and 3. As stated above, all these areas drain overland through high points and low points off-site to a tributary of Hawes Run/Mill Creek. Mill Creek discharges to Mill Pond and then ultimately to Lewis Bay. According to the Web Soil Survey of Barnstable County published by Natural Resources Conservation Service (NRCS), the project area is majority comprised of Carver loamy coarse sand which is Hydrologic Soil Group A. Results from infiltration test pits completed in October 2022 and December 2022 confirm loamy sandy soils on site. Therefore, Soil Group A is assumed for all stormwater calculations. See Appendix J for the test pit results. See below for pre-development drainage area characteristics. Calculations for these characteristics are shown in Appendix E. Table 1: Pre-Development Drainage Area Characteristics Area (acres) CN Value Pre-Development Drainage Area 1 3.12 30 Pre-Development Drainage Area 2 0.49 31 Pre-Development Drainage Area 3 0.25 31 c. Post-Development Conditions The proposed conditions consist of approximately 125,689 SF of pavement. Approximately 3.93 acres of woodland will be removed to make room for the storage lot. Infiltration basins will be constructed to Page 4 of 16 Project 3172201210 | Date – January 19th, 2022 c. Post-Development Conditions The proposed conditions consist of approximately 125,689 SF of pavement. Approximately 3.93 acres of woodland will be removed to make room for the storage lot. Infiltration basins will be constructed to accommodate the 100-year storm event and infiltrate the recharge volume and water quality volume. Runoff produced by the pavement will be conveyed to the infiltration basin through proposed storm sewer and overland flow paths. There are three drainage areas in the proposed conditions within the project’s footprint. All three consist of proposed pavement and wooded and open areas. Drainage Area 1 drains into the storm sewer system that discharges into infiltration Basin 1. Drainage Area 2 drains into the storm sewer system that discharges into infiltration Basin 2. Drainage Area 3 drains into the storm sewer system that discharges into infiltration Basin 3. See the below table for post-development drainage area characteristics. Calculations for these characteristics are shown in Appendix E. Table 2: Post-Development Drainage Area Characteristics Area (acres) CN Value Time of Concentration (minutes) Post-Development Drainage Area 1 3.12 86 5 Post-Development Drainage Area 2 0.49 66 5 Post-Development Drainage Area 3 0.25 50 5 The proposed stormwater management system has been designed to meet the requirements of the Massachusetts (MA) Department of Environmental Protection (DEP) Stormwater Handbook, the MA DEP Hydrology Handbook for Conservation Commissioners, and the bylaws and stormwater regulations of the Town of Yarmouth, including Section 2.05. Specifics of the project’s stormwater management system is discussed in the following sections. d. Construction Sequence The first phase of this project is to remove the existing trees within the project area. Approximately 3.93 acres of trees will be removed. 3.91 acres will be removed in January/February 2023. The remainder is within the 200-ft River Front Area Buffer so those will be removed after conservation permitting approval and before the end of March 2023. Removing the trees during the winter months follows environmental regulations. Additionally, it promotes a streamlined construction schedule in the springtime. Only the tree clearing activities will be completed during the winter months. The rest of the project’s construction will start in May 2023 and finish by December 2023. Once construction activity is complete, native landscaping will be planted along the frontage and neighboring property lines to provide adequate screening. Additionally, the landscape screening will also maintain the existing aesthetic as currently viewed from Willow Street. The infiltration basin and other open areas within the project footprint will be planted with a native seed mix. Page 5 of 16 Project 3172201210 | Date – January 19th, 2022 2. Mass DEP Stormwater Management Standards a. Standard 1 – New Stormwater Discharges Mass DEP Standard 1 states that no new stormwater conveyances may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. This project meets the requirements of Standard 1 because it is not proposing any stormwater discharges that are untreated or cause erosion. Per Volume 3 Chapter 1 of the MA DEP Stormwater Handbook, computations for Standards 4 – 6 may also demonstrate compliance with adequately treating stormwater for Standard 1. These computations are presented in the following Standard 4, Standard 5, and Standard 6 sections. This project is proposing all proposed stormwater runoff is directed towards infiltration basins through a storm sewer system. The basins are sized to infiltrate the water quality volume and to detain the 100-year storm event. Catch basins and hydrodynamic separators are proposed upstream of the infiltration basin to remove total suspended solids (TSS). b. Standard 2 – Stormwater Runoff Rates i. Infiltration Basin Sizing Mass DEP Standard 2 states that post-development peak discharge rates shall not exceed pre- development peak discharge rates for the 2-year, 10-year, and 100-year 24-hour storm events. Per the MA DEP Stormwater Handbook Volume 1 Chapter 1 and the Hydrology Handbook for Commissioners, TR 55 and SCS Type III methods were used to calculate the peak discharges from each drainage area. The site’s overall outfall is the existing eastern creek in both pre- and post-development conditions. Basin 1 Infiltration Basin 1 is proposed to manage stormwater runoff from post-development Drainage Area 1. Because the basin is designed to detain a 100-year 24-hour post-development storm event, it will prevent an increase in peak discharge rates at the site’s outfall from pre-development to post-development conditions for a 2-year, 10-year, and 100-year 24-hour storm events. The Bentley SewerGEMS program was used to model the proposed stormwater management system and compare pre-development to post-development conditions. While the calculated CN value for pre- development Drainage Area 1 is 30 based on TR-55, the model requires a minimum value of 40. The modeling output is included in Appendix H. Table 3: Peak Surface Runoff (cfs) – Drainage Area 1 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 1 0.004 0.11 1.49 Post-Development Drainage Area 1 6.15 10.18 16.70 Page 6 of 16 Project 3172201210 | Date – January 19th, 2022 Table 4: Peak Outfall Flowrates (cfs) – Drainage Area 1 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 1 - (Unrestricted Free Outfall) 0.004 0.11 1.49 Post-Development Drainage Area 1 - (Restricted by Proposed Infiltration Basin) 0.00 0.00 0.00 The infiltration basin was sized using Bentley SewerGEMS program with the Green Ampt seepage method applied in the model. Below are the assumed infiltration characteristics based on NRCS Web Soil Survey, soil borings, and Rawls Rate Table 2.3.3 from the MA DEP Stormwater Handbook. Table 5: Assumed Basin 1 Infiltration Characteristics Suction Head (in) (Average Value of Soil Capillary Suction along the Wetting Front) 5.6 Conductivity (in/hr) 2.41 Initial Deficit (fraction) (Fraction of Soil Volume that is Initially Dry) 0.50 The bottom of the basin is at 29.0 and the top of the basin is at 32.0. The emergency overflow elevation is at 31.75. The 100-year storm event high water level is 30.58 which provides 1-ft of free board prior to overtopping the basin. As previously discussed, the basin has been sized to prevent an increase of peak discharge from pre-development to post-development conditions for Drainage Area 1. Results from the SewerGEMS model can be found in Appendix H. Table 6: Proposed Basin 1 Geometry Elevation (ft) Area (Acres) Volume (CF) 29.0 0.338 -- 30.0 0.376 15,555 31.0 0.416 17,252 32.0 0.456 18,989 Total Infiltration Basin Volume (Average End Area Method) 51,796 Page 7 of 16 Project 3172201210 | Date – January 19th, 2022 Table 7: Proposed Basin 1 Characteristics 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm High Water Level (ft) 29.34 29.80 30.58 Required Basin Volume (CF) 5,052 12,245 25,272 Basin Release Rate (cfs) (Restricted by Infiltration) 0.00 0.00 0.00 Infiltration Time (hour) 14.78 18.27 24.17 Basin 2 Infiltration Basin 2 is proposed to manage stormwater runoff from post-development Drainage Area 2. Because the basin is designed to detain a 100-year 24-hour post-development storm event, it will prevent an increase in peak discharge rates at the site’s outfall from pre-development to post-development conditions for a 2-year, 10-year, and 100-year 24-hour storm events. The Bentley SewerGEMS program was used to model the proposed stormwater management system and compare pre-development to post-development conditions. While the calculated CN value for pre- development Drainage Area 1 is 31 based on TR-55, the model requires a minimum value of 40. The modeling output is included in Appendix H. Table 8: Peak Surface Runoff (cfs) – Drainage Area 2 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 2 0.001 0.02 0.23 Post-Development Drainage Area 2 0.33 0.82 1.72 Table 9: Peak Outfall Flowrates (cfs) – Drainage Area 2 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 2 - (Unrestricted Free Outfall) 0.001 0.02 0.23 Post-Development Drainage Area 2 - (Restricted by Proposed Infiltration Basin) 0.00 0.00 0.00 The infiltration basin was sized using Bentley SewerGEMS program with the Green Ampt seepage method applied in the model. Below are the assumed infiltration characteristics based on NRCS Web Soil Survey, soil borings, and Rawls Rate Table 2.3.3 from the MA DEP Stormwater Handbook. Page 8 of 16 Project 3172201210 | Date – January 19th, 2022 Table 10: Assumed Basin 2 Infiltration Characteristics Suction Head (in) (Average Value of Soil Capillary Suction along the Wetting Front) 5.6 Conductivity (in/hr) 2.41 Initial Deficit (fraction) (Fraction of Soil Volume that is Initially Dry) 0.50 The bottom of the basin is at 30.46 and the top of the basin is at 32.0. The 100-year storm event high water level is 31 which provides 1-ft of free board prior to overtopping the basin. As previously discussed, the basin has been sized to prevent an increase of peak discharge from pre-development to post-development conditions for Drainage Area 2. Results from the SewerGEMS model can be found in Appendix H. Table 11: Proposed Basin 2 Geometry Elevation (ft) Area (Acres) Volume (CF) 30.46 0.052 -- 31.00 0.086 1,628 32.00 0.149 5,127 Total Infiltration Basin Volume (Average End Area Method) 6,755 Table 12: Proposed Basin 2 Characteristics 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm High Water Level (ft) 30.46 30.62 31.00 Required Basin Volume (CF) 2 394 1,643 Basin Release Rate (cfs) (Restricted by Infiltration) 0.00 0.00 0.00 Infiltration Time (hour) 0 13.62 16.86 Basin 3 Infiltration Basin 3 is proposed to manage stormwater runoff from post-development Drainage Area 3. Because the basin is designed to detain a 100-year 24-hour post-development storm event, it will prevent an increase in peak discharge rates at the site’s outfall from pre-development to post-development conditions for a 2-year, 10-year, and 100-year 24-hour storm events. The Bentley SewerGEMS program was used to model the proposed stormwater management system and compare pre-development to post-development conditions. While the calculated CN value for pre- Page 9 of 16 Project 3172201210 | Date – January 19th, 2022 development Drainage Area 1 is 31 based on TR-55, the model requires a minimum value of 40. The modeling output is included in Appendix H. Table 13: Peak Surface Runoff (cfs) – Drainage Area 3 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 3 0.0003 0.009 0.12 Post-Development Drainage Area 3 0.009 0.10 0.38 Table 14: Peak Outfall Flowrates (cfs) – Drainage Area 3 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm Pre-Development Drainage Area 3 - (Unrestricted Free Outfall) 0.0003 0.009 0.12 Post-Development Drainage Area 3 - (Restricted by Proposed Infiltration Basin) 0.00 0.00 0.00 The infiltration basin was sized using Bentley SewerGEMS program with the Green Ampt seepage method applied in the model. Below are the assumed infiltration characteristics based on NRCS Web Soil Survey, test pits, and Rawls Rate Table 2.3.3 from the MA DEP Stormwater Handbook. Table 15: Assumed Basin 3 Infiltration Characteristics Suction Head (in) (Average Value of Soil Capillary Suction along the Wetting Front) 5.6 Conductivity (in/hr) 2.41 Initial Deficit (fraction) (Fraction of Soil Volume that is Initially Dry) 0.50 The bottom of the basin is at 29.9 and the top of the basin is at 31.2. The 100-year storm event high water level is 30.13 which provides 1-ft of free board prior to overtopping the basin. As previously discussed, the basin has been sized to prevent an increase of peak discharge from pre-development to post-development conditions for Drainage Area 3. Results from the SewerGEMS model can be found in Appendix H. Page 10 of 16 Project 3172201210 | Date – January 19th, 2022 Table 16: Proposed Basin 3 Geometry Elevation (ft) Area (Acres) Volume (CF) 29.9 0.023 -- 30.0 0.025 104 31.0 0.041 1,441 31.2 0.050 399 Total Infiltration Basin Volume (Average End Area Method) 1,945 Table 17: Proposed Basin 3 Characteristics 2-Year, 24-hr Storm 10-Year, 24-hr Storm 100-Year, 24-hr Storm High Water Level (ft) 29.90 29.91 30.13 Required Basin Volume (CF) 0.1 0.5 248 Basin Release Rate (cfs) (Restricted by Infiltration) 0.00 0.00 0.00 Infiltration Time (hour) 0 (negligible) 0 (negligible) 14.78 ii. Storm Sewer Sizing The storm sewer is designed to convey the 25-year storm event from the Post-Development Drainage Areas. Per the MA DEP Hydrology Handbook for Commissioners, the Rational Method was used to size the storm sewer. In the event the storm sewer system fails, the post-development drainage areas slope and spillover towards their respective infiltration basins. The Catchment Exhibit and output from Bentley SewerGEMS are included in Appendix I. As noted on the Catchment Exhibit, there are three off-site drainage areas and one undisturbed on-site area that drain through this project site. These areas do not need to be treated, but the project maintains existing drainage paths towards the east creek. Off-site catchments Off-1A and Off-1B and undisturbed catchment On-2A drain into proposed Basin 2. These areas discharge into ST FES B-4 and ST FES A-3. These structures’ invert elevations are set at 31’, which is the high-water elevation of the 100-year storm. This ensures that the runoff from Post- Development Area 2 is infiltrated and stored in Basin 2, but that any additional runoff from off-site has an exit path from the basin. Off-site catchment Off-3 drains to an existing low point at the north end of the project area. ST CB E-3 is proposed to be installed in this low point to pick up this off-site runoff and provide a path to the east creek. Page 11 of 16 Project 3172201210 | Date – January 19th, 2022 Off-site catchment Off-4 drains into proposed Basin 3. This area discharges into ST FES A-5. The invert elevation is set at 30.5, which is above the high-water elevation of the 100-year storm. This ensures that the runoff from Post-Development Area 3 is infiltrated and stored in Basin 3, but that any additional runoff from off-site has an exit path from the basin. This storm sewer configuration maintains the existing drainage paths for off-site runoff to reach the eastern creek, but also that the generated on-site runoff is being adequately treated. c. Standard 3 – Groundwater Recharge Volume Standard 3 requires infiltration of the calculated recharge volume which is based on impervious area. The recharge volume is calculated using Equation 1 from MA DEP Stormwater Handbook Volume 3 Chapter 1. Rv = F * A Rv = Required Recharge Volume F = Target Depth Factor A = Impervious Area The target depth factor is determined using Table 2.3.2 in the MA DEP Stormwater Handbook Volume 3 Chapter 1. As previously stated, the soils at the location of proposed infiltration are Hydrologic Soil Type A based on test pits. Referring to Table 2.3.2, the target depth factor is 0.6-inch for Type A. Applying the Static Method, this results in the Required Recharge Volume is: • Required Drainage Area 1 = 5,537 CF; Provided Basin 1 Infiltration Volume = 51,796 CF • Required Drainage Area 2 = 545 CF; Provided Basin 2 Infiltration Volume = 6,755 CF • Required Drainage Area 3 = 158 CF; Provided Basin 3 Infiltration Volume = 1,945 CF Therefore, the proposed stormwater management system meets Standard 3. The bottom area of the infiltration basins were sized to ensure all stormwater runoff infiltrates within 72 hours using the formula presented in MA DEP Stormwater Handbook Volume 3 Chapter 1, as listed below: T = Rv / (K*1/12*Bottom Area) T = Drawdown time (hours) Rv = Recharge Volume K = Saturated Hydraulic Conductivity Bottom Area = Bottom Area of Recharge Structure For the Static Method of infiltration, Rawls Rate is used for K and is obtained from Table 2.3.3 in the MA DEP Stormwater Handbook Volume 3 Chapter 1. Using the data from NRCS and Table 2.3.3, K is approximately 2.41 in/hr. As shown below, the provided bottom areas and provided recharge volumes are greater than the required amounts. Page 12 of 16 Project 3172201210 | Date – January 19th, 2022 Table 18: Recharge Volume Calculations – Basin 1 Table 19: Recharge Volume Calculations – Basin 2 Page 13 of 16 Project 3172201210 | Date – January 19th, 2022 Table 20: Recharge Volume Calculations – Basin 3 A completed geotechnical report has been requested for this location to confirm soil conditions, but the results were not available at the time of this report. Therefore, the assumption is that the in-situ soils at the proposed infiltration location are Hydrologic Soil Type A is based on the test pits. Once the conclusions of the geotechnical report are available this site will be reanalyzed for infiltration effectiveness. d. Standard 4 – Water Quality & TSS Removal i. Required Water Quality Volume and TSS Removal The MA Stormwater Standard 3 requires 80% Total Suspended Solids (TSS) removal of the calculated water quality volume. The water quality volume is calculated using Equation 3 from the MA DEP Stormwater Handbook Volume 3 Chapter 1. The water quality volume is determined based on proposed impervious surface area. WQV = DWQ * AIMP * 1/12 WQV = Water Quality Volume DWQ = Water Quality Depth AIMP = Impervious Area This project is within a Zone II Area which requires 1 inch for the water quality depth. This results in the Water Quality Volume of: • Required Drainage Area 1 = 9,229 CF; Provided Basin 1 Water Quality Volume = 25,272 CF • Required Drainage Area 2 = 908 CF; Provided Basin 2 Water Quality Volume = 1,643 CF • Required Drainage Area 3 = 264 CF; Provided Basin 3 Water Quality Volume = 274 CF Therefore, the proposed stormwater management system meets Standard 4. A treatment train of deep sump catch basins and hydrodynamic separators are proposed to meet the 80% TSS removal requirement. The TR-55 Graphical Peak Discharge Method was used to determine the water Page 14 of 16 Project 3172201210 | Date – January 19th, 2022 quality volume flowrate to size the hydrodynamic separator. Refer to Appendix G for details on the hydrodynamic separator and the MA DEP TSS Removal Calculation Spreadsheet. Table 21: Water Quality Volume Calculations – Drainage Area 1 Table 22: Water Quality Volume Calculations – Drainage Area 2 Table 23: Water Quality Volume Calculations – Drainage Area 3 ii. Long-term Pollution Prevention Plan The long-term pollution prevention plan has been combined with the Operation and Maintenance Plan required by Standard 9. Refer to the Standard 9 section of this report for more details. e. Standard 5 – Land Uses with Higher Potential Pollutant Loads (LUHPPLs) This project is constructing an asphalt parking lot that is intended for infrequent vehicle storage. Therefore, this project is not considered a land use with higher potential pollutant loads and Standard 5 does not apply. f. Standard 6 – Critical Areas According to the state of Massachusetts’s online MassMapper, this project does fall within Zone II. However, this project does not discharge to an Outstanding Resource Water or Special Resource Water. Page 15 of 16 Project 3172201210 | Date – January 19th, 2022 Standard 6 for Zone II has requirements for proper management of deicing chemicals, for providing 80% TSS removal with at least 44% removed prior to entering the infiltration structure, and for treating the 1” required water quality volume. Referring to the Operation and Maintenance Plan, salt will not be used as a deicing chemical at this site. Additionally, the treatment train provides 80% TSS removal prior to discharging into the proposed infiltration basin. The infiltration basin is designed to treat the required water quality volume. Therefore, this project meets the requirements of Standard 6. g. Standard 7 – Redevelopment Projects This project is considered new development and has been designed to fully comply with the MA DEP Stormwater Handbook. Therefore, Standard 7 does not apply. h. Standard 8 – Erosion and Sedimentation Control Plan A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan has been prepared and is included in Appendix L. Additionally, Erosion and Sediment Control Plans have been included in the project plan set. This project is planning to disturb over 1-acre, therefore a NPDES Construction General Permit will be acquired prior to construction. i. Standard 9 – Operation and Maintenance Plan A long-term operation and maintenance plan has been prepared and is included in Appendix K. The document is intended to satisfy the requirements of Standard 4 and Standard 9. j. Standard 10 – Prohibition of Illicit Discharges This project does not propose any new illicit discharges to the stormwater management system and therefore meets the requirements of Standard 10. 3. Yarmouth Stormwater Management Performance Standards a. Low Impact Development (LID) This project uses LID principles by minimizing the proposed impervious footprint. Reducing the impervious footprint was a comment from the Design Review process where unused pavement in the corners of the storage lot were replaced with landscaping instead. Additionally, truck turning movements were analyzed to provide the minimum amount of pavement needed for the truck to circulate the storage lot. In addition, this project is infiltrating the 100-year storm event volume which is beyond what the infiltration standard requires (refer to Standard 3 section above). b. Good Housekeeping Procedures Good housekeeping procedures are documented in the Operation and Maintenance Manual in Appendix K. This includes the procedures outlined in the Yarmouth stormwater standards section 2.05.2. Page 16 of 16 Project 3172201210 | Date – January 19th, 2022 c. Stormwater Management Systems i. Post-Development Peak Discharge rates Post-development peak discharge rates do not exceed pre-development peak discharge rates for the 2, 10, 25, 50, and 100-year 24-hour storms. Additionally, the 50-year post-development stormwater volume is retained onsite with the proposed infiltration basin. The 100-year post-development stormwater volume is also retained onsite and does not discharge offsite. ii. Structural Pretreatment Per Town regulations, structural pretreatment is required for all proposed infiltration devices to remove 44% TSS from runoff before it enters the infiltration device. This is achieved with the proposed treatment train consisting of deep sump catch basins and hydrodynamic separators. Refer to Appendix G for details on the hydrodynamic separator and the MA DEP TSS Removal Calculation Spreadsheet. iii. Precipitation Data The precipitation data provided in National Oceanic and Atmospheric Administration (NOAA) – National Weather Service “NOAA Atlas 14” was used for this project’s stormwater calculations, thus fulfilling this requirement. This data is included in Appendix F. d. Stormwater Management Systems for New Development This standard requires new developments to meet an average annual pollutant removal equivalent to 90% of the average annual load of TSS, 60% of the average annual load of Total Phosphorus (TP), and 30% of the average annual load of Total Nitrogen (TN). The TSS removal is achieved through deep sump catch basins and hydrodynamic separators. According to the MA Stormwater Standard Volume 2, the proposed infiltration basin meets the TP and TN removal percentages. Additionally, this project retains the volume of runoff greater than 1” multiplied by the total post-construction impervious surface area (refer to the Standard 4 section above). Therefore, this project meets this standard. e. Stormwater Management Systems for Redevelopme nt This project is considered new development. Therefore, the redevelopment standards do not apply. f. BMP Performance BMP performance is documented based on MassDEP Stormwater Standards and design guidance. Refer to Appendix G for details on the hydrodynamic separator and the MA DEP TSS Removal Calculation Spreadsheet. g. Discharges to Impaired Water Bodies This project is not discharging to an impaired water bodies or tributary. All runoff from 100-year storm events are retained onsite. Project 3172201210 APPENDIX A USGS LOCATION MAP The National Map Advanced Viewer USGS The National Map: National Boundaries Dataset, 3DEP Elevation Program, Geographic Names Information System, National Hydrography 6/30/2022, 12:17:28 PM 0 0.1 0.20.05 mi 0 0.15 0.30.07 km 1:9,028 USGS 2021 USGS Approx. Project Location Project 7211940 APPENDIX B FEMA MAP National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250 Feet Ü SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS Without Base Flood Elevation (BFE) Zone A, V, A99 With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mileZone X Future Conditions 1% Annual Chance Flood HazardZone X Area with Reduced Flood Risk due to Levee. See Notes.Zone X Area with Flood Risk due to LeveeZone D NO SCREEN Area of Minimal Flood Hazard Zone X Area of Undetermined Flood HazardZone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature Base Flood Elevation Line (BFE) Effective LOMRs Limit of Study Jurisdiction Boundary Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 6/30/2022 at 1:18 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Legend OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES MAP PANELS 8 B 20.2 The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. 1:6,000 70°16'4"W 41°40'48"N 70°15'27"W 41°40'21"N Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020 Approx. Project Location Project 7211940 APPENDIX C NRCS WEB SOIL SURVEY MAP Hydrologic Soil Group—Barnstable County, Massachusetts Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/28/2022 Page 1 of 4461420046143004614400461450046146004614700461420046143004614400461450046146004614700394500394600394700394800394900395000395100395200395300 394400 394500 394600 394700 394800 394900 395000 395100 395200 395300 41° 40' 40'' N 70° 16' 6'' W41° 40' 40'' N70° 15' 25'' W41° 40' 19'' N 70° 16' 6'' W41° 40' 19'' N 70° 15' 25'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 19N WGS84 0 200 400 800 1200 Feet 0 50 100 200 300 Meters Map Scale: 1:4,440 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:25,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Barnstable County, Massachusetts Survey Area Data: Version 18, Sep 1, 2021 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 10, 2018—Nov 17, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Barnstable County, Massachusetts Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/28/2022 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 11A Berryland mucky loamy coarse sand, 0 to 2 percent slopes A/D 21.7 25.1% 256A Deerfield loamy fine sand, 0 to 3 percent slopes A 0.1 0.1% 259A Carver loamy coarse sand, 0 to 3 percent slopes A 62.8 72.6% 259B Carver loamy coarse sand, 3 to 8 percent slopes A 1.1 1.2% 602 Urban land 0.8 0.9% Totals for Area of Interest 86.5 100.0% Hydrologic Soil Group—Barnstable County, Massachusetts Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/28/2022 Page 3 of 4 Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Barnstable County, Massachusetts Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/28/2022 Page 4 of 4 Project 7211940 APPENDIX D PRE-DEVELOPMENT AND POST -DEVELOPMENT STORMWATER EXHIBITS WILLOW STREET3535 323233 33 33 333333 333333333334343434 343030 353531313131 31313232 323233 3333 33 3334 343230 303030 353 535 35 2 7 27 2 8 28 2929 31 313131313131 313232 3232323232 333333333434 3 4 3436 36 36 36303030303 030 30303 0 30302 8 282 929 292929 29292931313 1 31313131313132 3232323 2 3 2 3232 323232 3232333 3 333333313233333233ON-11.34PROPERTY LINE, TYP.EXISTING DRAINAGE PATH, TYP.EXISTING GRADE VARIES AND DOES NOT HAVE ADIRECT PATH THROUGH THE PROJECT SITE TO THEEXISTING CREEK TO THE EAST.STUDYING THE TOPOGRAPHIC SURVEY AND EXISTINGGRADES, IT APPEARS RUNOFF FROM THE PROJECTSITE MEANDERS ITS WAY TO THE CREEK THROUGH ADRAINAGE PATH, SUCH AS ANY OF THE ONES SHOWN.EXISTING OFF-SITE TO ON-SITEDRAINAGE PATH, TYP.EXISTING OFF-SITE TO ON-SITEDRAINAGE PATH, TYP.EXISTING ON-SITE TO OFF-SITEDRAINAGE PATH, TYP.EXISTING ON-SITE TOOFF-SITE DRAINAGEPATH, TYP.EXISTING OFF-SITE TO ON-SITEDRAINAGE PATH, TYP.EXISTING OFF-SITE TO ON-SITEDRAINAGE PATH, TYP.EXISTING DRAINAGE PATH, TYP.EXISTING DRAINAGE PATH, TYP.ON-21.36ON-30.06ON-40.58ON-50.32ON-60.28ON-70.09ON-80.13ON-90.13EXISTING DRAINAGEPATH, TYP.EXISTING ON-SITE TO OFF-SITEDRAINAGE PATH, TYP.303030 303 5 352929 31 313131 31 31 3131313 1 323232 32 32 3232 33 3 3 333333 34 3 4 EXISTING ON-SITE TO OFF-SITEDRAINAGE PATH, TYP.OFF-10.02 ACRESOFF-20.04 ACRESOFF-30.38 ACRESOFF-40.06 ACRESOFF-50.04 ACRESOFF-60.02 ACRESIN PROPOSED CONDITIONS,DRAINAGE AREAS ON-5, ON-6AND ON-7 WILL BE REGRADEDSO RUNOFF REMAINS ON-SITE.IN PROPOSED CONDITIONS, THEBASIN IS DESIGNED SO THATDRAINAGE AREAS OFF-5 AND OFF-6ARE NOT DRAINING INTO THE BASIN.IN PROPOSED CONDITIONS,DRAINAGE AREA ON-3 WILL BEREGRADED SO RUNOFFREMAINS ON-SITE.APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:EX. DA-1PRE- DEVELOPMENT DRAINAGE AREAS EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Stormwater Exhibit - Existing.dwg1/16/2023 5:28:49 PM LEGEND:PRE ON-SITE TO ON-SITEDRAINAGE AREAPRE ON-SITE TO OFF-SITEDRAINAGE AREAPRE OFF-SITE TO ON-SITEDRAINAGE AREAPRE ON-SITE TO ON-SITEFLOW PATHPRE ON-SITE TO OFF-SITEFLOW PATHPRE OFF-SITE TO ON-SITEFLOW PATH WILLOW STREET3535 323233 33 33 333333 333333333334343434 343030 353531313131 31313232 323233 3333 33 3334 343230 303030 353 535 35 2 7 27 2 8 28 2929 31 313131313131 313232 3232323232 333333333434 3 4 3436 36 36 36303030303 030 30303 0 30302 8 282 929 292929 29292931313 1 31313131313132 3232323 2 3 2 3232 323232 3232333 3 333333313233333233 DA-13.12PROPERTY LINE, TYP.EXISTING DRAINAGE PATH, TYP.EXISTING GRADE VARIES AND DOES NOT HAVE ADIRECT PATH THROUGH THE PROJECT SITE TO THEEXISTING CREEK TO THE EAST.STUDYING THE TOPOGRAPHIC SURVEY AND EXISTINGGRADES, IT APPEARS RUNOFF FROM THE PROJECTSITE MEANDERS ITS WAY TO THE CREEK THROUGH ADRAINAGE PATH, SUCH AS ANY OF THE ONES SHOWN.OFF-10.05 ACRESOFF-30.38 ACRESOFF-40.06 ACRES3030303 0 3535 313 1 31 3 2 3 2 3 3 3 3 3 4 34353232 33 333435 3531 3 1 31 31 32 32 3 2 32 32 33 33 343434 3436 363737DA-20.49DA-30.25ON-20.04 ACRESAPRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:EX. ST-1STORMWATER EXHIBIT - PRE- DEVELOPMENT CONDITIONS EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Stormwater Exhibit.dwg1/16/2023 5:27:03 PM LEGEND:PRE DRAINAGE AREAEXISTING DRAINAGE PATHWOODED AREAPOST DRAINAGE AREAOPEN AREAPAVED AREAPRE ON-SITE AREA NOTDISTURBED BY PROJECTPRE OFF-SITE TO ON-SITEDRAINAGE AREA WILLOW STREET3535 323233 33 33 333333 333333333334343434 343030 353531313131 31313232 323233 3333 33 3334 343230 303030 353 535 35 2 7 27 2 8 28 2929 31 313131313131 313232 3232323232 333333333434 3 4 3436 36 36 36303030303 030 30303 0 30302 8 282 929 292929 29292931313 1 31313131313132 3232323 2 3 2 3232 323232 3232333 3 333333313233333233 DA-13.1232 33 33 33 33 33 33 343434 34 3030292931313132323233 33 333333 33 3231 343335333229 30 31 32 2930 PROPERTY LINE, TYP.PROPOSED STORMSEWER, TYP.DA-30.25DA-20.49POST-DISTURBANCE AREA 1TIME OF CONCENTRATIONPATH TC = 5 MINSPOST-DISTURBANCE AREA 2TIME OF CONCENTRATIONPATH TC = 5 MINSPOST-DISTURBANCE AREA 3TIME OF CONCENTRATIONPATH TC = 10 MINSPROPOSED SWALE ANDFES TO CONTINUE TOPROVIDE DRAINAGE PATHFOR OFF-SITE RUNOFF30PROPOSED DITCH ANDFES TO CONTINUE TOPROVIDE DRAINAGE PATHFOR OFF-SITE RUNOFFPROPOSED INTAKE TOCONTINUE TO PROVIDEDRAINAGE PATH FOROFF-SITE RUNOFFOFF-10.05 ACRESOFF-30.38 ACRESOFF-40.06 ACRES3030303 0 3535 313 1 31 3 2 3 2 3 3 3 3 3 4 34353232 33 333435 3531 3 1 31 31 32 32 3 2 32 32 33 33 343434 3436 363737 BASIN 1BASIN 3BASIN 2ON-20.04 ACRESAPRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:EX. ST-2STORMWATER EXHIBIT - POST- DEVELOPMENT CONDITIONS EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Stormwater Exhibit.dwg1/16/2023 5:27:24 PM LEGEND:PRE DRAINAGE AREATIME OF CONCENTRATION PATHWOODED AREAOPEN AREAPAVED AREAPOST DRAINAGE AREAPOST ON-SITE AREA NOTDISTURBED BY PROJECTPOST OFF-SITE TO ON-SITEDRAINAGE AREA APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:EX. ST-3STORMWATER EXHIBIT - CALCULATIONS EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Stormwater Exhibit.dwg1/16/2023 5:27:55 PM DESIGN METHOD STATEMENT:STORMWATER CALCULATIONS WERE DETERMINED USING SCS TYPE IIIMETHOD AND TR55 PER THE REQUIREMENTS SPECIFIED IN THE MADEP STORMWATER HANDBOOK AND THE HYDROLOGY HANDBOOKFOR CONSERVATION COMMISSIONERS.Pre-Drainage Area 1Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement980.000%0.00Woods, Good303.12100%6.35Open Space, Fair390.000%0.00Total3.12100%6.35Composite CN Value30Post-Drainage Area 1Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement982.5482%0.82Woods, Good300.227%0.07Open Space, Fair390.3511%0.11Total3.12100%1.00Composite CN Value86Pre-Drainage Area 2Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement980.000%0.00Woods, Good300.4592%0.92Open Space, Fair390.048%0.08Total0.49100%1.00Composite CN Value31Post-Drainage Area 2Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement980.2551%0.51Woods, Good300.1938%0.38Open Space, Fair390.0511%0.11Total0.49100%1.00Composite CN Value66Pre-Drainage Area 3Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement980.000%0.00Woods, Good300.2391%0.91Open Space, Fair390.029%0.09Total0.25100%1.00Composite CN Value31Post-Drainage Area 3Hydrologic Soil GroupACN ValueArea (Acres)Area (Percent)Area (Fraction)Gravel760.000%0.00Pavement980.0728%0.28Woods, Good300.1662%0.62Open Space, Fair390.029%0.09Total0.25100%1.00Composite CN Value50Time of Concentration -Post-Development Area 1Total Length (ft)383TR 55 Sheet FlowNotes:Start Elevation (ft)33.5End Elevation (ft)32.25Length (ft)113.6Slope (ft/ft)0.0110n (asphalt)0.011Table 3-1P2 (in)3.35T (hr)0.03Eq. 3-3T (min)1.7TR 55 Open Channel FlowNotes:Diameter (in)15Flow Area (SF)1.053Pwetted (ft)2.768R (ft)0.380Eq. 3-4Length (ft)176.4Start Elevation (ft)29.877End Elevation (ft)29.26Slope (ft/ft)0.003n (concrete)0.013Velocity (ft/s)3.558Eq. 3-4T (hr)0.0138Eq. 3-1T (min)0.826TR 55 Open Channel FlowNotes:Diameter (in)18Flow Area (SF)1.516Pwetted (ft)3.321R (ft)0.456Eq. 3-4Length (ft)94.6Start Elevation (ft)29.26End Elevation (ft)29Slope (ft/ft)0.003n (concrete)0.013Velocity (ft/s)3.561Eq. 3-4T (hr)0.0074Eq. 3-1T (min)0.443Tc (min)2.9Round to (min)5Tc (hour)0.08Time of Concentration -Post-Development Area 2Total Length171TR 55 Sheet FlowNotes:Start Elevation (ft)34.15End Elevation (ft)33.42Length (ft)100Slope (ft/ft)0.0073n (asphalt)0.011Table 3-1P2 (in)3.35T (hr)0.03Eq. 3-3T (min)1.8TR 55 Shallow Concentrated FlowNotes:Length (ft)56Start Elevation (ft)33.42End Elevation (ft)33.18Slope (ft/ft)0.0043Velocity (ft/s)1.4Figure 3-1T (hr)0.011Eq. 3-1T (min)0.7TR 55 Open Channel FlowNotes:Diameter (in)15Flow Area (SF)1.053Pwetted (ft)2.768R (ft)0.380Eq. 3-4Length (ft)17.5Start Elevation (ft)30.575End Elevation (ft)30.51Slope (ft/ft)0.004n (concrete)0.013Velocity (ft/s)3.663Eq. 3-4T (hr)0.0013Eq. 3-1T (min)0.080Tc (min)2.5Round to (min)5Tc (hour)0.08Time of Concentration -Post-Development Area 2Total Length239TR 55 Sheet FlowNotes:Start Elevation (ft)33.59End Elevation (ft)31.11Length (ft)100Slope (ft/ft)0.0248n (grass)0.150Table 3-1P2 (in)3.35T (hr)0.15Eq. 3-3T (min)8.8TR 55 Shallow Concentrated FlowNotes:Length (ft)139Start Elevation (ft)31.11End Elevation (ft)29.9Slope (ft/ft)0.0087Velocity (ft/s)1.800Figure 3-1T (hr)0.022Eq. 3-1T (min)1.3Tc (min)10.1Round to (min)10Tc (hour)0.17 Project 7211940 APPENDIX E CN & TIME OF CONCENTRATION CALCULATIONS Hydrologic Soil Group A Hydrologic Soil Group A Hydrologic Soil Group A CN Value Area (Acres)Area (Percent)Area (Fraction)CN Value Area (Acres)Area (Percent)Area (Fraction)CN Value Area (Acres)Area (Percent)Area (Fraction) Gravel 76 0.00 0%0.00 Gravel 76 0.00 0%0.00 Gravel 76 0.00 0%0.00 Pavement 98 0.00 0%0.00 Pavement 98 0.00 0%0.00 Pavement 98 0.00 0%0.00 Woods, Good 30 3.12 100%6.35 Woods, Good 30 0.45 92%0.92 Woods, Good 30 0.23 91%0.91 Open Space, Fair 39 0.00 0%0.00 Open Space, Fair 39 0.04 8%0.08 Open Space, Fair 39 0.02 9%0.09 Total 3.12 100%6.35 Total 0.49 100%1.00 Total 0.25 100%1.00 Composite CN Value 30 Composite CN Value 31 Composite CN Value 31 Hydrologic Soil Group A Hydrologic Soil Group A Hydrologic Soil Group A CN Value Area (Acres)Area (Percent)Area (Fraction)CN Value Area (Acres)Area (Percent)Area (Fraction)CN Value Area (Acres)Area (Percent)Area (Fraction) Gravel 76 0.00 0%0.00 Gravel 76 0.00 0%0.00 Gravel 76 0.00 0%0.00 Pavement 98 2.54 82%0.82 Pavement 98 0.25 51%0.51 Pavement 98 0.07 28%0.28 Woods, Good 30 0.22 7%0.07 Woods, Good 30 0.19 38%0.38 Woods, Good 30 0.16 62%0.62 Open Space, Fair 39 0.35 11%0.11 Open Space, Fair 39 0.05 11%0.11 Open Space, Fair 39 0.02 9%0.09 Total 3.12 100%1.00 Total 0.49 100%1.00 Total 0.25 100%1.00 Composite CN Value 86 Composite CN Value 66 Composite CN Value 50 Pre-Drainage Area 1 Post-Drainage Area 1 Pre-Drainage Area 2 Post-Drainage Area 2 Pre-Drainage Area 3 Post-Drainage Area 3 Total Length (ft)383 Notes: Start Elevation (ft)33.5 End Elevation (ft)32.25 Length (ft)113.6 Slope (ft/ft)0.0110 n (asphalt)0.011 Table 3-1 P2 (in)3.35 T (hr)0.03 Eq. 3-3 T (min)1.7 Notes: Diameter (in)15 Flow Area (SF)1.053 Pwetted (ft)2.768 R (ft)0.380 Eq. 3-4 Length (ft)176.4 Start Elevation (ft)29.877 End Elevation (ft)29.26 Slope (ft/ft)0.003 n (concrete)0.013 Velocity (ft/s)3.558 Eq. 3-4 T (hr)0.0138 Eq. 3-1 T (min)0.826 Notes: Diameter (in)18 Flow Area (SF)1.516 Pwetted (ft)3.321 R (ft)0.456 Eq. 3-4 Length (ft)94.6 Start Elevation (ft)29.26 End Elevation (ft)29 Slope (ft/ft)0.003 n (concrete)0.013 Velocity (ft/s)3.561 Eq. 3-4 T (hr)0.0074 Eq. 3-1 T (min)0.443 Tc (min)2.9 Round to (min)5 Tc (hour)0.08 Time of Concentration - Post-Development Area 1 TR 55 Open Channel Flow TR 55 Sheet Flow TR 55 Open Channel Flow Total Length 171 Notes: Start Elevation (ft)34.15 End Elevation (ft)33.42 Length (ft)100 Slope (ft/ft)0.0073 n (asphalt)0.011 Table 3-1 P2 (in)3.35 T (hr)0.03 Eq. 3-3 T (min)1.8 Notes: Length (ft)56 Start Elevation (ft)33.42 End Elevation (ft)33.18 Slope (ft/ft)0.0043 Velocity (ft/s)1.4 Figure 3-1 T (hr)0.011 Eq. 3-1 T (min)0.7 Notes: Diameter (in)15 Flow Area (SF)1.053 Pwetted (ft)2.768 R (ft)0.380 Eq. 3-4 Length (ft)17.5 Start Elevation (ft)30.575 End Elevation (ft)30.51 Slope (ft/ft)0.004 n (concrete)0.013 Velocity (ft/s)3.663 Eq. 3-4 T (hr)0.0013 Eq. 3-1 T (min)0.080 Tc (min)2.5 Round to (min)5 Tc (hour)0.08 TR 55 Shallow Concentrated Flow TR 55 Open Channel Flow Time of Concentration - Post-Development Area 2 TR 55 Sheet Flow Total Length 239 Notes: Start Elevation (ft)33.59 End Elevation (ft)31.11 Length (ft)100 Slope (ft/ft)0.0248 n (grass)0.150 Table 3-1 P2 (in)3.35 T (hr)0.15 Eq. 3-3 T (min)8.8 Notes: Length (ft)139 Start Elevation (ft)31.11 End Elevation (ft)29.9 Slope (ft/ft)0.0087 Velocity (ft/s)1.800 Figure 3-1 T (hr)0.022 Eq. 3-1 T (min)1.3 Tc (min)10.1 Round to (min)10 Tc (hour)0.17 TR 55 Sheet Flow TR 55 Shallow Concentrated Flow Time of Concentration - Post-Development Area 2 Project 7211940 APPENDIX F NOAA RAINFALL DATA 7/14/22, 11:04 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=depth&units=english&series=pds 1/4 NOAA Atlas 14, Volume 10, Version 3 Location name: South Yarmouth, Massachusetts, USA* Latitude: 41.6633°, Longitude: -70.199° Elevation: 18.18 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 0.268 (0.214‑0.330) 0.339 (0.271‑0.418) 0.455 (0.363‑0.564) 0.551 (0.436‑0.687) 0.684 (0.523‑0.898) 0.783 (0.586‑1.05) 0.889 (0.646‑1.25) 1.02 (0.689‑1.44) 1.21 (0.785‑1.78) 1.37 (0.868‑2.06) 10-min 0.379 (0.304‑0.468) 0.480 (0.384‑0.593) 0.645 (0.514‑0.799) 0.782 (0.620‑0.975) 0.970 (0.741‑1.27) 1.11 (0.830‑1.49) 1.26 (0.916‑1.77) 1.44 (0.976‑2.05) 1.71 (1.11‑2.52) 1.94 (1.23‑2.92) 15-min 0.446 (0.357‑0.550) 0.565 (0.452‑0.697) 0.759 (0.604‑0.940) 0.920 (0.729‑1.15) 1.14 (0.872‑1.50) 1.31 (0.977‑1.75) 1.48 (1.08‑2.08) 1.69 (1.15‑2.40) 2.01 (1.31‑2.96) 2.29 (1.45‑3.43) 30-min 0.657 (0.527‑0.811) 0.829 (0.663‑1.02) 1.11 (0.884‑1.38) 1.34 (1.06‑1.67) 1.66 (1.27‑2.18) 1.90 (1.42‑2.55) 2.15 (1.57‑3.02) 2.46 (1.67‑3.49) 2.92 (1.90‑4.30) 3.32 (2.10‑4.98) 60-min 0.869 (0.696‑1.07) 1.09 (0.874‑1.35) 1.46 (1.16‑1.81) 1.76 (1.39‑2.19) 2.18 (1.67‑2.86) 2.49 (1.86‑3.34) 2.82 (2.05‑3.96) 3.22 (2.18‑4.58) 3.83 (2.49‑5.64) 4.35 (2.76‑6.53) 2-hr 1.22 (0.984‑1.50) 1.51 (1.22‑1.86) 1.99 (1.60‑2.45) 2.39 (1.90‑2.95) 2.93 (2.26‑3.81) 3.34 (2.51‑4.44) 3.77 (2.76‑5.22) 4.29 (2.93‑6.02) 5.07 (3.32‑7.36) 5.73 (3.66‑8.49) 3-hr 1.46 (1.18‑1.78) 1.79 (1.45‑2.19) 2.34 (1.88‑2.87) 2.79 (2.23‑3.44) 3.41 (2.64‑4.41) 3.87 (2.93‑5.12) 4.37 (3.21‑6.01) 4.95 (3.40‑6.91) 5.83 (3.83‑8.40) 6.56 (4.21‑9.65) 6-hr 1.91 (1.55‑2.31) 2.31 (1.88‑2.80) 2.96 (2.40‑3.61) 3.51 (2.83‑4.29) 4.26 (3.31‑5.44) 4.82 (3.66‑6.29) 5.41 (3.99‑7.33) 6.10 (4.22‑8.40) 7.11 (4.71‑10.1) 7.94 (5.14‑11.5) 12-hr 2.38 (1.96‑2.87) 2.85 (2.33‑3.43) 3.60 (2.94‑4.35) 4.22 (3.43‑5.13) 5.08 (3.98‑6.43) 5.73 (4.38‑7.39) 6.41 (4.74‑8.56) 7.17 (5.01‑9.77) 8.27 (5.53‑11.6) 9.16 (5.97‑13.1) 24-hr 2.84 (2.34‑3.40) 3.35 (2.76‑4.01) 4.18 (3.43‑5.02) 4.87 (3.98‑5.88) 5.82 (4.58‑7.29) 6.54 (5.03‑8.34) 7.29 (5.41‑9.58) 8.10 (5.70‑10.9) 9.23 (6.23‑12.8) 10.1 (6.66‑14.3) 2-day 3.26 (2.71‑3.87) 3.80 (3.15‑4.52) 4.68 (3.87‑5.58) 5.42 (4.45‑6.49) 6.43 (5.09‑7.96) 7.20 (5.57‑9.07) 7.98 (5.96‑10.4) 8.82 (6.26‑11.7) 9.96 (6.78‑13.6) 10.9 (7.20‑15.1) 3-day 3.54 (2.96‑4.19) 4.09 (3.41‑4.85) 4.99 (4.14‑5.93) 5.74 (4.73‑6.84) 6.76 (5.38‑8.33) 7.54 (5.86‑9.45) 8.34 (6.25‑10.7) 9.18 (6.56‑12.1) 10.3 (7.08‑14.0) 11.2 (7.49‑15.6) 4-day 3.79 (3.17‑4.47) 4.34 (3.63‑5.12) 5.24 (4.36‑6.21) 5.99 (4.96‑7.12) 7.02 (5.60‑8.62) 7.80 (6.08‑9.74) 8.61 (6.48‑11.0) 9.46 (6.78‑12.4) 10.6 (7.31‑14.4) 11.6 (7.75‑15.9) 7-day 4.43 (3.73‑5.20) 4.99 (4.19‑5.86) 5.91 (4.94‑6.95) 6.67 (5.55‑7.88) 7.71 (6.19‑9.39) 8.51 (6.67‑10.5) 9.32 (7.06‑11.8) 10.2 (7.34‑13.2) 11.4 (7.86‑15.2) 12.3 (8.26‑16.7) 10-day 5.03 (4.25‑5.88) 5.61 (4.73‑6.57) 6.56 (5.51‑7.70) 7.35 (6.14‑8.66) 8.44 (6.80‑10.2) 9.27 (7.29‑11.4) 10.1 (7.67‑12.7) 11.0 (7.96‑14.2) 12.2 (8.45‑16.1) 13.1 (8.84‑17.6) 20-day 6.86 (5.83‑7.96) 7.54 (6.40‑8.76) 8.65 (7.32‑10.1) 9.58 (8.06‑11.2) 10.9 (8.80‑13.0) 11.8 (9.37‑14.4) 12.8 (9.77‑15.9) 13.8 (10.1‑17.5) 15.0 (10.5‑19.6) 15.8 (10.8‑21.1) 30-day 8.42 (7.19‑9.74) 9.20 (7.84‑10.6) 10.5 (8.89‑12.1) 11.5 (9.72‑13.4) 13.0 (10.6‑15.4) 14.1 (11.2‑17.0) 15.2 (11.6‑18.6) 16.2 (11.9‑20.5) 17.4 (12.3‑22.6) 18.3 (12.6‑24.1) 45-day 10.4 (8.94‑12.0) 11.3 (9.69‑13.0) 12.8 (10.9‑14.7) 14.0 (11.8‑16.2) 15.6 (12.8‑18.5) 16.9 (13.5‑20.3) 18.2 (13.9‑22.1) 19.3 (14.3‑24.2) 20.6 (14.6‑26.5) 21.4 (14.8‑28.0) 60-day 12.2 (10.4‑13.9) 13.1 (11.3‑15.1) 14.7 (12.6‑16.9) 16.0 (13.6‑18.5) 17.9 (14.6‑21.0) 19.3 (15.4‑23.0) 20.7 (15.9‑25.0) 21.8 (16.2‑27.3) 23.2 (16.6‑29.7) 24.1 (16.7‑31.3) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical 7/14/22, 11:04 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=depth&units=english&series=pds 2/4 Back to Top Maps & aerials Small scale terrain 7/14/22, 11:04 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=depth&units=english&series=pds 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 7/14/22, 11:04 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=depth&units=english&series=pds 4/4 Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi 7/14/22, 11:06 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=intensity&units=english&series=pds 1/4 NOAA Atlas 14, Volume 10, Version 3 Location name: South Yarmouth, Massachusetts, USA* Latitude: 41.6633°, Longitude: -70.199° Elevation: 18.18 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 3.22 (2.57‑3.96) 4.07 (3.25‑5.02) 5.46 (4.36‑6.77) 6.61 (5.23‑8.24) 8.21 (6.28‑10.8) 9.40 (7.03‑12.6) 10.7 (7.75‑15.0) 12.2 (8.27‑17.3) 14.5 (9.42‑21.3) 16.5 (10.4‑24.7) 10-min 2.27 (1.82‑2.81) 2.88 (2.30‑3.56) 3.87 (3.08‑4.79) 4.69 (3.72‑5.85) 5.82 (4.45‑7.63) 6.66 (4.98‑8.95) 7.56 (5.50‑10.6) 8.64 (5.86‑12.3) 10.3 (6.67‑15.1) 11.7 (7.38‑17.5) 15-min 1.78 (1.43‑2.20) 2.26 (1.81‑2.79) 3.04 (2.42‑3.76) 3.68 (2.92‑4.59) 4.56 (3.49‑5.99) 5.22 (3.91‑7.02) 5.93 (4.31‑8.31) 6.78 (4.59‑9.62) 8.06 (5.23‑11.8) 9.14 (5.79‑13.7) 30-min 1.31 (1.05‑1.62) 1.66 (1.33‑2.05) 2.22 (1.77‑2.75) 2.68 (2.12‑3.34) 3.32 (2.54‑4.36) 3.79 (2.84‑5.10) 4.30 (3.13‑6.04) 4.92 (3.33‑6.98) 5.85 (3.80‑8.60) 6.64 (4.20‑9.96) 60-min 0.869 (0.696‑1.07) 1.09 (0.874‑1.35) 1.46 (1.16‑1.81) 1.76 (1.39‑2.19) 2.18 (1.67‑2.86) 2.49 (1.86‑3.34) 2.82 (2.05‑3.96) 3.22 (2.18‑4.58) 3.83 (2.49‑5.64) 4.35 (2.76‑6.53) 2-hr 0.610 (0.492‑0.748) 0.756 (0.609‑0.928) 0.995 (0.798‑1.22) 1.19 (0.950‑1.48) 1.47 (1.13‑1.90) 1.67 (1.26‑2.22) 1.89 (1.38‑2.61) 2.14 (1.46‑3.01) 2.53 (1.66‑3.68) 2.86 (1.83‑4.24) 3-hr 0.486 (0.393‑0.593) 0.597 (0.482‑0.729) 0.778 (0.627‑0.954) 0.928 (0.743‑1.15) 1.14 (0.877‑1.47) 1.29 (0.975‑1.70) 1.46 (1.07‑2.00) 1.65 (1.13‑2.30) 1.94 (1.28‑2.80) 2.19 (1.40‑3.21) 6-hr 0.318 (0.259‑0.386) 0.385 (0.314‑0.468) 0.495 (0.401‑0.603) 0.586 (0.472‑0.717) 0.711 (0.553‑0.909) 0.804 (0.612‑1.05) 0.904 (0.666‑1.23) 1.02 (0.705‑1.40) 1.19 (0.787‑1.69) 1.33 (0.858‑1.93) 12-hr 0.198 (0.162‑0.238) 0.236 (0.193‑0.285) 0.299 (0.244‑0.361) 0.351 (0.284‑0.426) 0.422 (0.330‑0.534) 0.476 (0.364‑0.614) 0.532 (0.394‑0.710) 0.595 (0.416‑0.811) 0.686 (0.459‑0.964) 0.760 (0.496‑1.09) 24-hr 0.118 (0.098‑0.142) 0.140 (0.115‑0.167) 0.174 (0.143‑0.209) 0.203 (0.166‑0.245) 0.243 (0.191‑0.304) 0.273 (0.210‑0.347) 0.304 (0.226‑0.399) 0.337 (0.238‑0.454) 0.385 (0.260‑0.534) 0.422 (0.278‑0.597) 2-day 0.068 (0.056‑0.081) 0.079 (0.066‑0.094) 0.098 (0.081‑0.116) 0.113 (0.093‑0.135) 0.134 (0.106‑0.166) 0.150 (0.116‑0.189) 0.166 (0.124‑0.216) 0.184 (0.130‑0.244) 0.207 (0.141‑0.284) 0.226 (0.150‑0.315) 3-day 0.049 (0.041‑0.058) 0.057 (0.047‑0.067) 0.069 (0.058‑0.082) 0.080 (0.066‑0.095) 0.094 (0.075‑0.116) 0.105 (0.081‑0.131) 0.116 (0.087‑0.149) 0.128 (0.091‑0.168) 0.144 (0.098‑0.195) 0.156 (0.104‑0.216) 4-day 0.039 (0.033‑0.047) 0.045 (0.038‑0.053) 0.055 (0.045‑0.065) 0.062 (0.052‑0.074) 0.073 (0.058‑0.090) 0.081 (0.063‑0.101) 0.090 (0.068‑0.115) 0.099 (0.071‑0.129) 0.111 (0.076‑0.150) 0.121 (0.081‑0.166) 7-day 0.026 (0.022‑0.031) 0.030 (0.025‑0.035) 0.035 (0.029‑0.041) 0.040 (0.033‑0.047) 0.046 (0.037‑0.056) 0.051 (0.040‑0.063) 0.055 (0.042‑0.070) 0.061 (0.044‑0.079) 0.068 (0.047‑0.090) 0.073 (0.049‑0.099) 10-day 0.021 (0.018‑0.025) 0.023 (0.020‑0.027) 0.027 (0.023‑0.032) 0.031 (0.026‑0.036) 0.035 (0.028‑0.043) 0.039 (0.030‑0.047) 0.042 (0.032‑0.053) 0.046 (0.033‑0.059) 0.051 (0.035‑0.067) 0.054 (0.037‑0.073) 20-day 0.014 (0.012‑0.017) 0.016 (0.013‑0.018) 0.018 (0.015‑0.021) 0.020 (0.017‑0.023) 0.023 (0.018‑0.027) 0.025 (0.020‑0.030) 0.027 (0.020‑0.033) 0.029 (0.021‑0.037) 0.031 (0.022‑0.041) 0.033 (0.023‑0.044) 30-day 0.012 (0.010‑0.014) 0.013 (0.011‑0.015) 0.015 (0.012‑0.017) 0.016 (0.013‑0.019) 0.018 (0.015‑0.021) 0.020 (0.016‑0.024) 0.021 (0.016‑0.026) 0.022 (0.017‑0.028) 0.024 (0.017‑0.031) 0.025 (0.017‑0.034) 45-day 0.010 (0.008‑0.011) 0.010 (0.009‑0.012) 0.012 (0.010‑0.014) 0.013 (0.011‑0.015) 0.014 (0.012‑0.017) 0.016 (0.012‑0.019) 0.017 (0.013‑0.020) 0.018 (0.013‑0.022) 0.019 (0.014‑0.025) 0.020 (0.014‑0.026) 60-day 0.008 (0.007‑0.010) 0.009 (0.008‑0.010) 0.010 (0.009‑0.012) 0.011 (0.009‑0.013) 0.012 (0.010‑0.015) 0.013 (0.011‑0.016) 0.014 (0.011‑0.017) 0.015 (0.011‑0.019) 0.016 (0.011‑0.021) 0.017 (0.012‑0.022) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical 7/14/22, 11:06 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=intensity&units=english&series=pds 2/4 Back to Top Maps & aerials Small scale terrain 7/14/22, 11:06 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=intensity&units=english&series=pds 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 7/14/22, 11:06 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.6633&lon=-70.1990&data=intensity&units=english&series=pds 4/4 Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi Project 7211940 APPENDIX G TSS REMOVAL CALCULATIONS & HYDRODYNAMIC SEPARATOR INSTRUCTIONS:Non-automated: Mar. 4, 2008 1. Sheet is nonautomated. Print sheet and complete using hand calculations. Column A and B: See MassDEP Structural BMP Table 2. The calculations must be completed using the Column Headings specified in Chart and Not the Excel Column Headings 3. To complete Chart Column D, multiple Column B value within Row x Column C value within Row 4. To complete Chart Column E value, subtract Column D value within Row from Column C within Row 5. Total TSS Removal = Sum All Values in Column D Location: A B C D E TSS Removal Starting TSS Amount Remaining BMP1 Rate1 Load*Removed (B*C)Load (C-D) Deep Sump Catch Basin 0.25 1.00 0.25 0.75 Hydrodynamic Separator 0.87 0.75 0.65 0.10 90% Separate Form Needs to be Completed for Each Outlet or BMP Train Project: Eversource Energy Warehouse Prepared By:EAW *Equals remaining load from previous BMP (E) Date:1/19/2023 which enters the BMP 484 Willow Street, Yarmouth, MA 02673 TSS Removal Calculation Total TSS Removal = Area 0.77 ac ST MH A-1 Weighted C 0.9 66 tc 6 min Particle size 0 CDS Model 2015-4 1.4 cfs CDS Hydraulic Capacitycfs Rainfall Intensity1 (in/hr) Percent Rainfall Volume1 Cumulative Rainfall Volume Total Flowrate (cfs) Treated Flowrate (cfs) Incremental Removal (%) 0.08 35.3%35.3%0.06 0.06 33.4 0.16 23.8%59.1%0.11 0.11 21.8 0.24 12.9%72.0%0.17 0.17 11.5 0.32 7.8%79.8%0.22 0.22 6.8 0.40 4.9%84.7%0.28 0.28 4.1 0.48 3.5%88.3%0.33 0.33 2.8 0.56 1.7%90.0%0.39 0.39 1.3 0.64 1.8%91.8%0.45 0.45 1.4 0.72 1.9%93.7%0.50 0.50 1.4 0.80 0.9%94.6%0.56 0.56 0.6 1.00 2.3%96.9%0.70 0.70 1.5 2.00 2.9%99.8%1.39 1.39 0.8 3.00 0.2%100.0%2.09 1.40 0.0 87.5 0.0% 99.9% 87.5% 1 - Based on 14 years of 15 minute precipitation data from NCDC station 3821, Hyannis, in Barnstable County, MA 2 - Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes. Predicted Net Annual Load Removal Efficiency = Predicted % Annual Rainfall Treated = BASED ON THE RATIONAL RAINFALL METHOD BASED ON AN AVERAGE PARTICLE SIZE OF 50 MICRONS EVERSOURCE YARMOUTH ERP Removal Efficiency Adjustment2 = CDS ESTIMATED NET ANNUAL SOLIDS LOAD REDUCTION Rainfall Station # WEST YARMOUTH, MA Unit Site Designation CDS Treatment Capacity Area 0.86 ac ST MH B-2 Weighted C 0.9 66 tc 6 min Particle size 0 CDS Model 2015-4 1.4 cfs CDS Hydraulic Capacitycfs Rainfall Intensity1 (in/hr) Percent Rainfall Volume1 Cumulative Rainfall Volume Total Flowrate (cfs) Treated Flowrate (cfs) Incremental Removal (%) 0.08 35.3%35.3%0.06 0.06 33.3 0.16 23.8%59.1%0.12 0.12 21.7 0.24 12.9%72.0%0.18 0.18 11.4 0.32 7.8%79.8%0.25 0.25 6.7 0.40 4.9%84.7%0.31 0.31 4.0 0.48 3.5%88.3%0.37 0.37 2.8 0.56 1.7%90.0%0.43 0.43 1.3 0.64 1.8%91.8%0.49 0.49 1.3 0.72 1.9%93.7%0.55 0.55 1.3 0.80 0.9%94.6%0.62 0.62 0.6 1.00 2.3%96.9%0.77 0.77 1.4 2.00 2.9%99.8%1.54 1.40 0.8 3.00 0.2%100.0%2.31 1.40 0.0 86.6 0.0% 99.6% 86.6% 1 - Based on 14 years of 15 minute precipitation data from NCDC station 3821, Hyannis, in Barnstable County, MA 2 - Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes. Predicted Net Annual Load Removal Efficiency = Predicted % Annual Rainfall Treated = BASED ON THE RATIONAL RAINFALL METHOD BASED ON AN AVERAGE PARTICLE SIZE OF 50 MICRONS EVERSOURCE YARMOUTH ERP Removal Efficiency Adjustment2 = CDS ESTIMATED NET ANNUAL SOLIDS LOAD REDUCTION Rainfall Station # WEST YARMOUTH, MA Unit Site Designation CDS Treatment Capacity Area 0.95 ac ST MH C-1 Weighted C 0.9 66 tc 6 min Particle size 0 CDS Model 2015-4 1.4 cfs CDS Hydraulic Capacitycfs Rainfall Intensity1 (in/hr) Percent Rainfall Volume1 Cumulative Rainfall Volume Total Flowrate (cfs) Treated Flowrate (cfs) Incremental Removal (%) 0.08 35.3%35.3%0.07 0.07 33.2 0.16 23.8%59.1%0.14 0.14 21.6 0.24 12.9%72.0%0.20 0.20 11.3 0.32 7.8%79.8%0.27 0.27 6.6 0.40 4.9%84.7%0.34 0.34 4.0 0.48 3.5%88.3%0.41 0.41 2.7 0.56 1.7%90.0%0.48 0.48 1.3 0.64 1.8%91.8%0.55 0.55 1.3 0.72 1.9%93.7%0.61 0.61 1.3 0.80 0.9%94.6%0.68 0.68 0.6 1.00 2.3%96.9%0.85 0.85 1.3 2.00 2.9%99.8%1.70 1.40 0.7 3.00 0.2%100.0%2.56 1.40 0.0 85.6 0.0% 99.4% 85.6% 1 - Based on 14 years of 15 minute precipitation data from NCDC station 3821, Hyannis, in Barnstable County, MA 2 - Reduction due to use of 60-minute data for a site that has a time of concentration less than 30-minutes. Predicted Net Annual Load Removal Efficiency = Predicted % Annual Rainfall Treated = BASED ON THE RATIONAL RAINFALL METHOD BASED ON AN AVERAGE PARTICLE SIZE OF 50 MICRONS EVERSOURCE YARMOUTH ERP Removal Efficiency Adjustment2 = CDS ESTIMATED NET ANNUAL SOLIDS LOAD REDUCTION Rainfall Station # WEST YARMOUTH, MA Unit Site Designation CDS Treatment Capacity PLAN VIEW B-BN.T.S.FIBERGLASS SEPARATIONCYLINDER AND INLETCENTER OF CDS STRUCTURE, SCREEN ANDSUMP OPENINGPVC HYDRAULIC SHEARPLATE2'-0" [610](2'-0" [610])1'-9" [533](4'-6" [1372])ELEVATION A-AN.T.S.FIBERGLASS SEPARATIONCYLINDER AND INLETSOLIDS STORAGE SUMPSEPARATIONSCREENINLET PIPE(MULTIPLE INLET PIPESMAY BE ACCOMMODATED)OUTLET PIPEPVC HYDRAULICSHEAR PLATE(4'-0" [1219])FLOWPERMANENT POOLELEV.OIL BAFFLE SKIRTCONTRACTOR TO GROUTTO FINISHED GRADEGRADERINGS/RISERSAA48" [1219] I.D. MANHOLESTRUCTURETOP SLAB ACCESS(SEE FRAME AND COVERDETAIL)VARIES +/-135°MAX.FLOW+/-65°MAX.BBFRAME AND COVER(DIAMETER VARIES)N.T.S. FOR MAINTENANCE CALL 1.800.33 8 . 1 1 2 2 www.contechES.comTMCl ean water starts here®800-338-1122 513-645-7000 513-645-7993 FAX9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069CDS2015-4-C ONLINE CDSSTANDARD DETAIL\\AD.CONTECH-CPI.COM\ROOT\STORMWATER\JURISDICTIONS\USA\MA\_SDE DESIGN TOOLS\_STANDARD DETAILS\CDS2015-4-C-DTL.DWG 8/6/2018 4:22 PMTHIS PRODUCT MAY BE PROTECTED BY ONE OR MORE OF THEFOLLOWING U.S. PATENTS: 5,788,848; 6,641,720; 6,511,595; 6,581,783;RELATED FOREIGN PATENTS, OR OTHER PATENTS PENDING.STRUCTURE IDWATER QUALITY FLOW RATE (CFS OR L/s)PEAK FLOW RATE (CFS OR L/s)RETURN PERIOD OF PEAK FLOW (YRS)SCREEN APERTURE (2400 OR 4700)PIPE DATA:I.E.MATERIALDIAMETERINLET PIPE 1INLET PIPE 2OUTLET PIPESITE SPECIFICDATA REQUIREMENTSWIDTHHEIGHTANTI-FLOTATION BALLASTNOTES/SPECIAL REQUIREMENTS:RIM ELEVATION* PER ENGINEER OF RECORD****************CDS2015-4-C DESIGN NOTESCDS2015-4-C RATED TREATMENT CAPACITY IS 1.4 CFS, OR PER LOCAL REGULATIONS.THE STANDARD CDS2015-4-C CONFIGURATION IS SHOWN. ALTERNATE CONFIGURATIONS ARE AVAILABLE AND ARE LISTED BELOW. SOMECONFIGURATIONS MAY BE COMBINED TO SUIT SITE REQUIREMENTS.GENERAL NOTES1.CONTECH TO PROVIDE ALL MATERIALS UNLESS NOTED OTHERWISE.2.FOR SITE SPECIFIC DRAWINGS WITH DETAILED STRUCTURE DIMENSIONS AND WEIGHT, PLEASE CONTACT YOUR CONTECH ENGINEEREDSOLUTIONS LLC REPRESENTATIVE. www.ContechES.com3.CDS WATER QUALITY STRUCTURE SHALL BE IN ACCORDANCE WITH ALL DESIGN DATA AND INFORMATION CONTAINED IN THIS DRAWING.CONTRACTOR TO CONFIRM STRUCTURE MEETS REQUIREMENTS OF PROJECT.4.STRUCTURE SHALL MEET AASHTO HS20 LOAD RATING, ASSUMING EARTH COVER OF 0' - 2', AND GROUNDWATER ELEVATION AT, OR BELOW,THE OUTLET PIPE INVERT ELEVATION. ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNDWATER ELEVATION. CASTINGS SHALL MEETAASHTO M306 AND BE CAST WITH THE CONTECH LOGO..5.IF REQUIRED, PVC HYDRAULIC SHEAR PLATE IS PLACED ON SHELF AT BOTTOM OF SCREEN CYLINDER. REMOVE AND REPLACE ASNECESSARY DURING MAINTENANCE CLEANING.6.CDS STRUCTURE SHALL BE PRECAST CONCRETE CONFORMING TO ASTM C-478 AND AASHTO LOAD FACTOR DESIGN METHOD.INSTALLATION NOTESA.ANY SUB-BASE, BACKFILL DEPTH, AND/OR ANTI-FLOTATION PROVISIONS ARE SITE-SPECIFIC DESIGN CONSIDERATIONS AND SHALL BESPECIFIED BY ENGINEER OF RECORD.B.CONTRACTOR TO PROVIDE EQUIPMENT WITH SUFFICIENT LIFTING AND REACH CAPACITY TO LIFT AND SET THE CDS MANHOLE STRUCTURE.C.CONTRACTOR TO INSTALL JOINT SEALANT BETWEEN ALL STRUCTURE SECTIONS AND ASSEMBLE STRUCTURE.D.CONTRACTOR TO PROVIDE, INSTALL, AND GROUT INLET AND OUTLET PIPE(S). MATCH PIPE INVERTS WITH ELEVATIONS SHOWN. ALL PIPECENTERLINES TO MATCH PIPE OPENING CENTERLINES.E.CONTRACTOR TO TAKE APPROPRIATE MEASURES TO ASSURE UNIT IS WATER TIGHT, HOLDING WATER TO FLOWLINE INVERT MINIMUM. IT ISSUGGESTED THAT ALL JOINTS BELOW PIPE INVERTS ARE GROUTED.GRATED INLET ONLY (NO INLET PIPE)GRATED INLET WITH INLET PIPE OR PIPESCURB INLET ONLY (NO INLET PIPE)CURB INLET WITH INLET PIPE OR PIPESCONFIGURATION DESCRIPTIONwww.contechES.com (5'-0" [1524] MIN.)SOLIDS STORAGE SUMP INLET PIPE, OPTIONAL (IF PIPE IS REQUIRED, INVERT IS 3" [76] HIGHER THAN OUTLET INVERT)VARIES1'-3" [381] MIN.PLAN VIEW TOP SLAB NOT SHOWN SECTION A-A 12" [305]Ø REMOVABLE DROP TEE FLOW CONTRACTOR TO GROUT TO FINISHED GRADE GRADE RINGS/RISERS (NOT PROVIDED BY CONTECH) STORMCEPTOR INSERT PERMANENT POOL ELEVATION REMOVABLE DROP TEE HANDLE 1'-5" [432]1'-8" [508]WEIRA A 4" [102]Ø OUTLET RISER FLOW 4" [102]Ø OIL INSPECTION PIPE (CAP OPTIONAL) OUTLET PIPE TOP SLAB ACCESS (SEE FRAME AND COVER DETAIL) 48" [1219]Ø I.D. MANHOLE STRUCTURE+/-90°MAXFRAME AND COVER (MAY VARY) NOT TO SCALE FRAME AND GRATE (MAY VARY) NOT TO SCALE www.ContechES.com ® 800-338-1122 513-645-7000 513-645-7993 FAX 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 STC450i STORMCEPTOR STANDARD DETAIL I:\STORMWATER\JURISDICTIONS\USA\MA\_SDE DESIGN TOOLS\_STANDARD DETAILS\STORMCEPTOR\STC450I-DTL.DWG9/24/2020 9:49 AMwww.contechES.com GENERAL NOTES 1.CONTECH TO PROVIDE ALL MATERIALS UNLESS NOTED OTHERWISE. 2.FOR SITE SPECIFIC DRAWINGS WITH DETAILED STRUCTURE DIMENSIONS AND WEIGHT, PLEASE CONTACT YOUR CONTECH ENGINEERED SOLUTIONS LLC REPRESENTATIVE. www.ContechES.com 3.STORMCEPTOR WATER QUALITY STRUCTURE SHALL BE IN ACCORDANCE WITH ALL DESIGN DATA AND INFORMATION CONTAINED IN THIS DRAWING. CONTRACTOR TO CONFIRM STRUCTURE MEETS REQUIREMENTS OF PROJECT. 4.STORMCEPTOR STRUCTURE SHALL MEET AASHTO HS20 LOAD RATING, ASSUMING EARTH COVER OF 0' - 2' [610], AND GROUNDWATER ELEVATION AT, OR BELOW, THE OUTLET PIPE INVERT ELEVATION. ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNDWATER ELEVATION. CASTINGS SHALL MEET AASHTO M306 AND BE CAST WITH THE CONTECH LOGO. 5.STORMCEPTOR STRUCTURE SHALL BE PRECAST CONCRETE CONFORMING TO ASTM C478 AND AASHTO LOAD FACTOR DESIGN METHOD. 6.ALTERNATE UNITS ARE SHOWN IN MILLIMETERS [mm]. INSTALLATION NOTES A.ANY SUB-BASE, BACKFILL DEPTH, AND/OR ANTI-FLOTATION PROVISIONS ARE SITE-SPECIFIC DESIGN CONSIDERATIONS AND SHALL BE SPECIFIED BY ENGINEER OF RECORD. B.CONTRACTOR TO PROVIDE EQUIPMENT WITH SUFFICIENT LIFTING AND REACH CAPACITY TO LIFT AND SET THE STORMCEPTOR MANHOLE STRUCTURE. C.CONTRACTOR TO INSTALL JOINT SEALANT BETWEEN ALL STRUCTURE SECTIONS AND ASSEMBLE STRUCTURE. D.CONTRACTOR TO PROVIDE, INSTALL, AND GROUT INLET AND OUTLET PIPE(S). MATCH PIPE INVERTS WITH ELEVATIONS SHOWN. ALL PIPE CENTERLINES TO MATCH PIPE OPENING CENTERLINES. E.CONTRACTOR TO TAKE APPROPRIATE MEASURES TO ASSURE UNIT IS WATER TIGHT, HOLDING WATER TO FLOWLINE INVERT MINIMUM. IT IS SUGGESTED THAT ALL JOINTS BELOW PIPE INVERTS ARE GROUTED. SITE SPECIFIC DATA REQUIREMENTS STRUCTURE ID WATER QUALITY FLOW RATE (cfs [L/s]) PEAK FLOW RATE (cfs [L/s]) RETURN PERIOD OF PEAK FLOW (yrs) RIM ELEVATION PIPE DATA:INVERT MATERIAL DIAMETER INLET PIPE 1 INLET PIPE 2 OUTLET PIPE NOTES / SPECIAL REQUIREMENTS: FOR PATENT INFORMATION, GO TO www.ContechES.com/IP STORMCEPTOR DESIGN NOTES THE STANDARD STC450I CONFIGURATION WITH ROUND, SOLID FRAME AND COVER, AND INLET PIPE IS SHOWN. ALTERNATE CONFIGURATIONS ARE AVAILABLE AND ARE LISTED BELOW. SOME CONFIGURATIONS MAY BE COMBINED TO SUIT SITE REQUIREMENTS. STORMCEPTOR STC450I RATED TREATMENT CAPACITY IS 0.40 CFS, OR PER LOCAL REGULATIONS CONFIGURATION DESCRIPTION GRATED INLET ONLY (NO INLET PIPE) GRATED INLET WITH INLET PIPE OR PIPES CURB INLET ONLY (NO INLET PIPE) CURB INLET WITH INLET PIPE OR PIPES Project 7211940 APPENDIX H INFILTRATION BASIN SIZING SEWERGEMS OUTPUT CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment O-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0042Flow (Maximum) in(N/A)Infiltration (Total)hours22.757Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³90.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment O-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0007Flow (Maximum) in(N/A)Infiltration (Total)hours22.757Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³14.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment O-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0003Flow (Maximum) in(N/A)Infiltration (Total)hours22.757Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³7.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours22.758Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³90.37527Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs0.0042Local Inflow (Maximum)hours22.758Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0042Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours22.758Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³14.18841Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.0007Local Inflow (Maximum)hours22.758Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0007Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 2-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours22.758Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³7.23525Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.0003Local Inflow (Maximum)hours22.758Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0003Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment O-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.1067Flow (Maximum) in(N/A)Infiltration (Total)hours12.708Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³2,348.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment O-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0167Flow (Maximum) in(N/A)Infiltration (Total)hours12.708Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³369.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment O-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0085Flow (Maximum) in(N/A)Infiltration (Total)hours12.708Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³188.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.708Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³2,347.77026Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs0.1066Local Inflow (Maximum)hours12.708Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.1066Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.708Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³368.71805Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.0167Local Inflow (Maximum)hours12.708Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0167Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 10-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.708Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³188.11935Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.0085Local Inflow (Maximum)hours12.708Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0085Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment O-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs1.4940Flow (Maximum) in(N/A)Infiltration (Total)hours12.375Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³10,805.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment O-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.2346Flow (Maximum) in(N/A)Infiltration (Total)hours12.375Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³1,697.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment O-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.330Time of Concentration 40.000SCS CN hours0.330Time of Concentration (Composite) 40.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.1197Flow (Maximum) in(N/A)Infiltration (Total)hours12.375Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³866.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.377Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³10,805.07715Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs1.4939Local Inflow (Maximum)hours12.377Time to Maximum Inflow ft0.0000Depth (Maximum)cfs1.4939Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.377Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³1,696.94995Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.2346Local Inflow (Maximum)hours12.377Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.2346Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Pre-Development 100-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours12.377Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³865.78961Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.1197Local Inflow (Maximum)hours12.377Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.1197Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment PO-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 86.000SCS CN hours0.083Time of Concentration (Composite) 86.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs6.1506Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³22,327.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment PO-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 66.000SCS CN hours0.083Time of Concentration (Composite) 66.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.3330Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³1,284.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment PO-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.167Time of Concentration 50.000SCS CN hours0.167Time of Concentration (Composite) 50.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0094Flow (Maximum) in(N/A)Infiltration (Total)hours12.458Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³146.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-1 <General> 93ID Notes PO-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.023Scaled Area Geometry Y (ft) X (ft) 26.0710.89 12.34-8.71 -10.55-1.72 -10.9622.21 11.6730.01 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.33829.0000 100.00.37630.0000 100.00.41631.0000 100.00.45632.0000 100.00.50033.0000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event PO-1 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft4.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.2Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.0000Hydraulic Grade ft0.3377Depth (Maximum)hours12.499Time to Maximum Hydraulic Grade ft0.0076Depth (Average)ft29.3377Hydraulic Grade (Maximum) %7.0Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³113.01247Volume (Average)hours12.127Time to Maximum Inflow hours12.499Time to Maximum Depth cfs6.1484Flow (Total In Maximum) ft³22,327.27344Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.127Time to Local Inflow (Maximum) hours12.499Time to Maximum Storage cfs6.1484Local Inflow (Maximum)ft³5,066.48877Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-2 <General> 102ID Notes PO-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area Geometry Y (ft) X (ft) 1.54-182.67 1.75-166.83 16.89-162.13 26.03-175.08 16.54-187.77 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.05230.4600 100.00.08631.0000 100.00.14932.0000 100.00.50032.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data 0.000Evaporation Factor Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event PO-2 SWMM Extended Data Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft2.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.0Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft30.4600Hydraulic Grade ft0.0007Depth (Maximum)hours12.128Time to Maximum Hydraulic Grade ft0.0000Depth (Average)ft30.4607Hydraulic Grade (Maximum) %0.0Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³0.02477Volume (Average)hours12.128Time to Maximum Inflow hours12.128Time to Maximum Depth cfs0.3325Flow (Total In Maximum) ft³1,283.88708Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.128Time to Local Inflow (Maximum) hours12.128Time to Maximum Storage cfs0.3325Local Inflow (Maximum)ft³1.66467Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-3 <General> 109ID Notes PO-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area Geometry Y (ft) X (ft) -83.33-153.52 -89.60-162.14 -99.74-158.85 -99.74-148.19 -89.60-144.89 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.02329.9000 100.00.02530.0000 100.00.04131.0000 100.00.05031.2000 100.00.50031.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event PO-3 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft1.6Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.0Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.9000Hydraulic Grade ft0.0000Depth (Maximum)hours12.461Time to Maximum Hydraulic Grade ft0.0000Depth (Average)ft29.9000Hydraulic Grade (Maximum) %0.0Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³0.00281Volume (Average)hours12.460Time to Maximum Inflow hours12.461Time to Maximum Depth cfs0.0094Flow (Total In Maximum) ft³145.71632Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.460Time to Local Inflow (Maximum) hours12.461Time to Maximum Storage cfs0.0094Local Inflow (Maximum)ft³0.04720Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 2-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment PO-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 86.000SCS CN hours0.083Time of Concentration (Composite) 86.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs10.1799Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³37,994.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) The difference between calculated peak flow and interpolated peak flow 3.6 % is greater than 1.5 %. Computed peak flow= 10.5558 cfs Interp. peak flow= 10.1799 cfs. Output increment for this catchment may be too large. (N/A) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment PO-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 66.000SCS CN hours0.083Time of Concentration (Composite) 66.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.8150Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³2,924.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) The difference between calculated peak flow and interpolated peak flow 1.9 % is greater than 1.5 %. Computed peak flow= 0.8306 cfs Interp. peak flow= 0.8150 cfs. Output increment for this catchment may be too large. (N/A) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment PO-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.167Time of Concentration 50.000SCS CN hours0.167Time of Concentration (Composite) 50.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.0970Flow (Maximum) in(N/A)Infiltration (Total)hours12.209Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³581.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-1 <General> 93ID Notes PO-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.023Scaled Area Geometry Y (ft) X (ft) 26.0710.89 12.34-8.71 -10.55-1.72 -10.9622.21 11.6730.01 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.33829.0000 100.00.37630.0000 100.00.41631.0000 100.00.45632.0000 100.00.50033.0000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event PO-1 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft4.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.8Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.0000Hydraulic Grade ft0.7961Depth (Maximum)hours12.614Time to Maximum Hydraulic Grade ft0.0400Depth (Average)ft29.7961Hydraulic Grade (Maximum) %16.9Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³607.60406Volume (Average)hours12.127Time to Maximum Inflow hours12.614Time to Maximum Depth cfs10.1788Flow (Total In Maximum) ft³37,993.86719Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.127Time to Local Inflow (Maximum) hours12.614Time to Maximum Storage cfs10.1788Local Inflow (Maximum)ft³12,246.52637Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-2 <General> 102ID Notes PO-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area Geometry Y (ft) X (ft) 1.54-182.67 1.75-166.83 16.89-162.13 26.03-175.08 16.54-187.77 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.05230.4600 100.00.08631.0000 100.00.14932.0000 100.00.50032.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data 0.000Evaporation Factor Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event PO-2 SWMM Extended Data Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft2.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.0Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft30.4600Hydraulic Grade ft0.1603Depth (Maximum)hours12.433Time to Maximum Hydraulic Grade ft0.0021Depth (Average)ft30.6203Hydraulic Grade (Maximum) %2.9Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³5.11039Volume (Average)hours12.127Time to Maximum Inflow hours12.433Time to Maximum Depth cfs0.8139Flow (Total In Maximum) ft³2,924.04810Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.127Time to Local Inflow (Maximum) hours12.433Time to Maximum Storage cfs0.8139Local Inflow (Maximum)ft³398.33041Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-3 <General> 109ID Notes PO-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area Geometry Y (ft) X (ft) -83.33-153.52 -89.60-162.14 -99.74-158.85 -99.74-148.19 -89.60-144.89 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.02329.9000 100.00.02530.0000 100.00.04131.0000 100.00.05031.2000 100.00.50031.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event PO-3 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft1.6Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.0Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.9000Hydraulic Grade ft0.0005Depth (Maximum)hours12.211Time to Maximum Hydraulic Grade ft0.0000Depth (Average)ft29.9005Hydraulic Grade (Maximum) %0.0Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³0.01120Volume (Average)hours12.211Time to Maximum Inflow hours12.211Time to Maximum Depth cfs0.0969Flow (Total In Maximum) ft³580.71368Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.211Time to Local Inflow (Maximum) hours12.211Time to Maximum Storage cfs0.0969Local Inflow (Maximum)ft³0.48527Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 10-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-1 <General> 91ID Notes CM-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.045Scaled Area acres3.120Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 21.79-94.46 1.70-121.39 -30.11-110.61 -29.69-77.02 2.38-67.04 Active Topology TrueIs Active? Catchment PO-1Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 86.000SCS CN hours0.083Time of Concentration (Composite) 86.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event CM-1 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs16.7016Flow (Maximum) in(N/A)Infiltration (Total)hours12.043Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres3.120Area (Unified)ft³64,097.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) The difference between calculated peak flow and interpolated peak flow 3.3 % is greater than 1.5 %. Computed peak flow= 17.2760 cfs Interp. peak flow= 16.7016 cfs. Output increment for this catchment may be too large. (N/A) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-2 <General> 100ID Notes CM-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area acres0.490Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) 30.69-151.25 30.91-135.41 46.04-130.71 55.18-143.66 45.69-156.35 Active Topology TrueIs Active? Catchment PO-2Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.083Time of Concentration 66.000SCS CN hours0.083Time of Concentration (Composite) 66.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event CM-2 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs1.7169Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.490Area (Unified)ft³6,124.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) The difference between calculated peak flow and interpolated peak flow 2.7 % is greater than 1.5 %. Computed peak flow= 1.7637 cfs Interp. peak flow= 1.7169 cfs. Output increment for this catchment may be too large. (N/A) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw CM-3 <General> 107ID Notes CM-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area acres0.250Area (User Defined) FalseUse Scaled Area? Geometry Y (ft) X (ft) -77.37-142.89 -76.91-133.44 -67.77-130.96 -62.59-138.88 -68.53-146.26 Active Topology TrueIs Active? Catchment PO-3Outflow Element Inflow (Wet) Collection Rainfall FalseUse Local Rainfall? Runoff Unit HydrographRunoff Method days7.0Drying Time %0.0Percent Impervious SCS Unit HydrographUnit Hydrograph Method Single AreaArea Defined By User Defined TcTc Input Type SCS CNLoss Method hours0.167Time of Concentration 50.000SCS CN hours0.167Time of Concentration (Composite) 50.000SCS CN (Composite)Default CurvilinearSCS Unit Hydrograph Method Results (Extended Catchment) in0.0Precipitation (Cumulative)in0.0Precipitation (Incremental) Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event CM-3 Results (Flow) cfs0.0000Flow (Total Out)FalseLocal Inflow? cfs0.0000Flow (Total Surface Runoff)cfs0.0000Flow (Local from Inflow Collection) Results (Maximum Values) in(N/A)Precipitation (Total)in(N/A)Runon (Total) in(N/A)Evaporation (Total)cfs0.3777Flow (Maximum) in(N/A)Infiltration (Total)hours12.126Time (Maximum Flow) %(N/A)Runoff Coefficient (Calculated) SWMM Results ft(N/A)Depth (Snow)in/h(N/A)Intensity (Rainfall) cfs(N/A)Flow (Groundwater)in/h(N/A)Loss Rate ft(N/A)Elevation (Groundwater)in/h(N/A)Evaporation Rate Results acres0.250Area (Unified)ft³1,661.00000Volume (Total Runoff) Calculation Messages MessageTime (hours) The difference between calculated peak flow and interpolated peak flow 3.9 % is greater than 1.5 %. Computed peak flow= 0.3932 cfs Interp. peak flow= 0.3777 cfs. Output increment for this catchment may be too large. (N/A) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-1 <General> 93ID Notes PO-1Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.023Scaled Area Geometry Y (ft) X (ft) 26.0710.89 12.34-8.71 -10.55-1.72 -10.9622.21 11.6730.01 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.33829.0000 100.00.37630.0000 100.00.41631.0000 100.00.45632.0000 100.00.50033.0000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event PO-1 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft4.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %3.2Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.0000Hydraulic Grade ft1.5810Depth (Maximum)hours12.964Time to Maximum Hydraulic Grade ft0.1495Depth (Average)ft30.5810Hydraulic Grade (Maximum) %34.9Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³2,346.87231Volume (Average)hours12.045Time to Maximum Inflow hours12.964Time to Maximum Depth cfs16.7014Flow (Total In Maximum) ft³64,096.76563Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.045Time to Local Inflow (Maximum) hours12.964Time to Maximum Storage cfs16.7014Local Inflow (Maximum)ft³25,360.29492Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-2 <General> 102ID Notes PO-2Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.010Scaled Area Geometry Y (ft) X (ft) 1.54-182.67 1.75-166.83 16.89-162.13 26.03-175.08 16.54-187.77 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.05230.4600 100.00.08631.0000 100.00.14932.0000 100.00.50032.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data 0.000Evaporation Factor Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event PO-2 SWMM Extended Data Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft2.0Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.4Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft30.4600Hydraulic Grade ft0.5496Depth (Maximum)hours12.535Time to Maximum Hydraulic Grade ft0.0205Depth (Average)ft31.0096Hydraulic Grade (Maximum) %12.0Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³57.26737Volume (Average)hours12.127Time to Maximum Inflow hours12.535Time to Maximum Depth cfs1.7157Flow (Total In Maximum) ft³6,123.98633Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.127Time to Local Inflow (Maximum) hours12.535Time to Maximum Storage cfs1.7157Local Inflow (Maximum)ft³1,658.95374Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw PO-3 <General> 109ID Notes PO-3Label <Collection: 0 items>Hyperlinks GIS-IDs GIS-ID <Geometry> acres0.004Scaled Area Geometry Y (ft) X (ft) -83.33-153.52 -89.60-162.14 -99.74-158.85 -99.74-148.19 -89.60-144.89 Active Topology TrueIs Active? Infiltration/Inflow & Seepage Green AmptPond Seepage Method in/h2.410Conductivity in5.6Suction Head 0.500Initial Deficit Inflow (Wet) Collection Physical Elevation- AreaVolume Type ft0.0000Depth (Maximum Curve) Elevation-Area Percent Void Space (%) Area (acres) Elevation (ft) 100.00.02329.9000 100.00.02530.0000 100.00.04131.0000 100.00.05031.2000 100.00.50031.5000 Simulation Initial Condition InvertInitial Elevation Type SWMM Extended Data Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event PO-3 SWMM Extended Data 0.000Evaporation Factor Water Quality F68.0Temperature (H2S)mg/L0.0BOD (Local Inflow) mg/L0.0H2S (Local Inflow)FalseApply Treatment? /day0.0Reaction Rate (H2S) Pollutograph Collection Pollutograph Results (Extended Node) ft³0.00000Volume ft1.6Freeboard Height ft0.0000Depth (Flooding) Results (Flow) cfs0.0000Flow (Total In)FalseLocal Inflow? cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) Results (H2S) mg/L(N/A)H2S (Out)min0.000Detention Time (average) mg/L(N/A)BOD (Out) Results %0.1Percent Full (Average)ft0.0000Depth (Node) %100.0Exfiltration Loss ft29.9000Hydraulic Grade ft0.2282Depth (Maximum)hours12.596Time to Maximum Hydraulic Grade ft0.0046Depth (Average)ft30.1282Hydraulic Grade (Maximum) %4.5Percent Full (Maximum)hours0.000Time to Maximum Overflow %0.0Evaporation Loss cfs0.0000Flow (Overflow Maximum) ft³4.96993Volume (Average)hours12.128Time to Maximum Inflow hours12.596Time to Maximum Depth cfs0.3776Flow (Total In Maximum) ft³1,660.64954Local Inflow (Total Volume)cfs0.0000Flow (Overflow) hours12.128Time to Local Inflow (Maximum) hours12.596Time to Maximum Storage cfs0.3776Local Inflow (Maximum)ft³249.89272Storage (Maximum) FalseIs Overflowing?cfs0.0000Flow (Seepage loss) FalseIs Ever Overflowing?cfs0.0000Flow (Evaporation loss) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-1 <General> 92ID <Collection: 0 items>Hyperlinks O-1Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft66.96X ft29.64Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft29.0000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft3.0000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event O-1 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.0000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.0000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-2 <General> 104ID <Collection: 0 items>Hyperlinks O-2Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-178.40X ft-25.28Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft32.0000Elevation (Rim) ft32.0000Elevation (Ground)ft30.4500Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.5500Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event O-2 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft30.4500Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft30.4500Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw O-3 <General> 111ID <Collection: 0 items>Hyperlinks O-3Label ft0+00Station Notes GIS-IDs GIS-ID <Geometry> ft-108.69X ft-111.58Y Active Topology TrueIs Active? Boundary Condition Free OutfallBoundary Condition Type FalseTidal Gate? <None>Route to Catchment Infiltration/Inflow & Seepage FalseApply SWMM RTK Unit Hydrograph Set? Inflow (Wet) Collection Physical TrueUpdate Ground Elevation from Terrain Model? ft31.2000Elevation (Rim) ft31.2000Elevation (Ground)ft29.9000Elevation (Invert) TrueSet Rim to Ground Elevation? Water Quality FalseApply Treatment? Pollutograph Collection Pollutograph Results (Flow) cfs0.0000Flow (Total Out)cfs0.0000Flow (Local from Inflow Collection) FalseLocal Inflow?ft³0.00000Volume (Total Outflow) Results (Misc) ft1.3000Depth (Structure) Results Page 1 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Post-Development 100-year Storm Event O-3 Results ft0.0000Depth (Average)ft0.0000Depth (Node) hours0.000Time to Local Inflow (Maximum) ft29.9000Hydraulic Grade ft³0.00000Local Inflow (Total Volume)hours0.000Time to Maximum Hydraulic Grade hours0.000Time to Maximum Depth ft29.9000Hydraulic Grade (Maximum) cfs0.0000Local Inflow (Maximum)hours0.000Time to Maximum Inflow ft0.0000Depth (Maximum)cfs0.0000Flow (Total In Maximum) Calculation Messages MessageTime (hours) Page 2 of 276 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-1666 1/17/2023 SewerGEMS [10.03.04.53] Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth.stsw Project 7211940 APPENDIX I STORM SEWER SIZING SEWERGEMS OUTPUT ST FES A-5ST MH D-1ST FES B-4ST CB E-2ST FES A-3ST CB A-4ST CB C-3ST CB A-2ST CB B-3ST MH C-2ST MH B-2ST MH A-1ST FES D-1ST CB E-3ST FES A-1ST FES B-1ST FES C-1ST FES E-1ST P-C-1ST P-A-2ST P-B-2ST P-B-1ST P-E-3ST P-C-2ST P-B-3ST P-A-5ST P-A-1ST P - A - 4 ST P-D-1ST P-A-3ST P-E-2ST P-E-1OFF-1BON-2BON-2AOFF-1AOFF-4CM A-3CM A-2CM A-1CM B-1CM B-2CM C-2CM C-1OFF-3CATCHMENT LIMITS, TYP.CM D-1BASIN 1BASIN 3BASIN 2APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:EX. ST-4STORM SEWER CATCHMENT EXHIBIT EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Catchment Exhibit.dwg1/16/2023 6:02:30 PM LEGEND:WOODED AREAOPEN AREAPAVED AREA Catchment Table - Time: 0.00 hours Flow (Total Out) (cfs) Catchment Intensity (in/h) Time of Concentration (Composite) (hours) Runoff Coefficient (Rational) Scaled Area (acres) Runoff MethodOutflow Element Label 4.248.2100.0830.9800.522Rational MethodCB A-2CM-A-2 2.058.2100.0830.9800.252Rational MethodCB A-1CM-A-1 3.808.2100.0830.9800.469Rational MethodCB B-3CM-B-1 2.678.2100.0830.9800.330Rational MethodCB C-2CM-C-1 4.968.2100.0830.9800.612Rational MethodCB C-3CM-C-1 4.068.2100.0830.9800.500Rational MethodCB C-4OFF-3 2.698.2100.0830.6600.493Rational MethodCB D-1CM-D-1 0.118.2100.0830.4000.032Rational MethodCB B-4ON-2-B 0.288.2100.0830.9800.034Rational MethodCB B-4OFF-1-B 0.488.2100.0830.9800.059Rational MethodCB A-5OFF-4 3.158.2100.0830.9800.388Rational MethodCB B-2CM-B-1 0.148.2100.0830.9800.017Rational MethodCB A-3OFF-1-A 0.038.2100.0830.4000.008Rational MethodCB A-3ON-2-A Page 1 of 376 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-16661/19/2023 SewerGEMS [10.03.04.53]Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth Storm Sewer.stsw Catch Basin Table - Time: 0.00 hours Headloss Method Depth (Gutter) (in) Spread / Top Width (ft) Hydraulic Grade Line (In) (ft) Flow (Captured) (cfs) Capture Efficiency (Calculated) (%) Inlet LocationInlet TypeElevation (Invert) (ft) Elevation (Rim) (ft) Label Standard1.14.431.790.48100.0In SagFull Capture31.5032.50CB A-5 Standard2.410.131.394.24100.0In SagFull Capture29.6932.25CB A-2 Standard2.39.731.373.80100.0In SagFull Capture29.8132.25CB B-3 Standard1.915.830.673.15100.0In SagFull Capture29.2232.00CB B-2 Standard1.814.930.812.67100.0In SagFull Capture29.2632.09CB C-2 Standard2.016.532.004.96100.0In SagFull Capture29.8832.25CB C-3 Standard2.49.931.434.06100.0In SagFull Capture30.1031.43CB C-4 Standard0.86.331.380.38100.0In SagFull Capture31.0033.01CB B-4 Standard0.73.031.390.17100.0In SagFull Capture31.0032.92CB A-3 Standard1.87.730.622.05100.0In SagFull Capture29.2632.00CB A-1 Standard2.08.531.242.69100.0In SagFull Capture30.5833.18CB D-1 Headloss Coefficient (Standard) 0.000 0.500 0.500 0.500 0.500 0.600 0.000 0.000 0.000 0.600 0.000 Page 2 of 376 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-16661/19/2023 SewerGEMS [10.03.04.53]Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth Storm Sewer.stsw Conduit Table - Time: 0.00 hours Flow (cfs) Manning's nNumber of Barrels Diameter (in) Slope (Calculated) (ft/ft) Length (Scaled) (ft) Invert (Stop) (ft) Stop NodeInvert (Start) (ft) Start NodeLabel 3.930.013115.00.003169.229.22CB B-229.81CB B-3P-B-2 4.960.013115.00.004174.529.26CB C-229.88CB C-3P-C-2 7.320.013118.00.00392.429.00O-329.26CB C-2P-C-1 0.380.013112.00.007165.329.81CB B-331.00CB B-4P-B-3 0.480.013112.00.006331.529.45MH A-431.50CB A-5P-A-5 6.520.013118.00.00291.429.00O-229.22CB B-2P-B-1 0.170.013112.00.009153.329.69CB A-231.00CB A-3P-A-3 4.110.013115.00.003169.629.26CB A-129.69CB A-2P-A-2 5.990.013118.00.00392.529.00O-429.26CB A-1P-A-1 0.420.013115.00.00537.829.26CB A-129.45MH A-4P-A-4 2.690.013115.00.01013.330.45O-630.58CB D-1P-D-1 4.060.01028.00.002161.829.82MH-630.10CB C-4P-E-2-3 3.950.013115.00.002336.029.00O-729.82MH-6P-E-1 Flow / Capacity (Design) (%) 103.1 128.9 131.3 12.6 17.0 126.5 5.1 126.3 107.5 9.1 42.1 310.4 123.7 Page 3 of 376 Watertown Road, Suite 2D Thomaston, CT 06787 USA +1-203-755-16661/19/2023 SewerGEMS [10.03.04.53]Bentley Systems, Inc. Haestad Methods Solution Center3172201210 Yarmouth Storm Sewer.stsw Project 7211940 APPENDIX J SOIL BORINGS FORM 11 - SOIL EVALUATOR FORM Page 1 of 2 Location Address or Lot No. On-site Review Deep Hole Number 1 Date: Time: Weather 70 F, Sunny Location (identify on site plan) Land Use Slope (%) Surface Stones: None Vegetation Landform Distances from: OpenWater Body feet Drainage way feet Possible Wet Area feet Property Line feet Drinking Water Well Other DEEP OBSERVATION HOLE LOG* Depth from Soil Horizon Soil Texture Soil Color Soil Other Surface (inches) (USDA) (Munsell) Mottling (Structure, Stones, Boulders, Consistency, % Gravel) * MINIMUM OF 2 HOLES REQUIRED AT EVERY PROPOSED DISPOSAL AREA Parent Material (geologic) Depth to Bedrock: Depth to Groundwater: Standing Water in the Hole:Weeping from Pit Face: Estimated Seasonal High Ground Water: 0" - 8" 3 - 6Commercial (Eversource site) loose 484 Willow Street, Yarmouth 10-21-22 > 100 12:00 PM N/A 30" - 72" > 10>100 Sand Coarse 2.5Y 6/6 8" - 30" 10Yr 5/8 Sand 5-10% gravel Loamy Sand 10Yr 3/2 Loamy 5-10% gravel 120" BGS >126" BGS N/A 2.5Y 6/4 Sand Glacial Outwash 48" BGS per C.C.C. Groundwater Adjustment Brush/Trees Outwash plain >100 feet A B C-1 72" - 126" C-2 Medium FORM 11 - SOIL EVALUATOR FORM Page 2 of 2 Location Address or Lot No. Determination for Seasonal High Water Table Method Used: Depth observed standing in observation hole inches Depth weeping from side of observation hole inches Depth to soil mottles inches Ground water adjusted feet b.g.s. Index Well Number A1W-231 Reading Date Index well level 28.1' Adjustment factor 6.00' Adjusted ground water level 4.00' b.g.s. Certification approved by the Department of Environmental Protection and that the above analysis was performed by me consistent with the required training, expertise and experience described in 310 CMR 15.017. Signature Michael Pimentel Date I certify that on Oct. 27, 1999 I have passed the soil evaluator examination 484 Willow Street, Yarmouth 10/23/2022 4.00 9/23/2022 FORM 12 - PERCOLATION TEST Page 1 of 1 Location Address or Lot No. Percolation Test* Date: 10/21/2022 Time: 12:50 PM Observation Hole # Depth of Perc Start Pre-soak End Pre-soak Time at 12" Time at 9" Time at 6" Time (9"-6") Rate min./in Site Passed Site Failed Performed By: Witnessed By: Comments: COMMONWEALTH OF MASSACHUSETTS Yarmouth , Massachusetts 1 8" - 26" 12:50 PM 484 Willow Street, Yarmouth N/A (Drainage test pit purposes only) Poured 24 gallons of water; Unable to pre-soak for 15 mins. 1:00 PM Michael Pimentel, E.I.T., C.S.E. < 2 HIGH GROUND-WATER LEVEL COMPUTATION Date: Site Location:Permit: Owner:Phone: Contractor:Phone: Notes: STEP 1 Date:0 mm/dd/yy feet below ls STEP 2 A) Appropriate index well B) Water-level range zone STEP 3 mm/yy STEP 4 0 STEP 5 0 NOTE* Tables 1-9 "Potential Water-Level Rise" are attached as worksheets to this file. Using Table of Potential Water Level Rise for index well (STEP 2A), current depth to water level for index well (STEP 3), and water-level zone (STEP 2B) determine water-level adjustment. Estimate depth to high water by subtracting the water-level adjustment (STEP 4) from measured depth to water level at site (STEP 1). Using monthly "Current Water Resources Conditions" determine current depth to water level for index well. Measure depth to water table to nearest 1/10 ft. (depth is in feet below land surface) Using Water-Level Range Zone and Index Well Map locate site and determine: monthly index well data: www.capecodcommission.org/wells.html 10-23-22 484 Willow Street Yarmouth, MA Eversource Robert B. Our (Excavator) Soil Evaluator: Michael Pimentel, EIT, CSE JC Engineering, Inc., 2854 Cranberry Highway, East Wareham, MA 02538 10.0010/21/22 A1W-231 5.00' - 5.99' 28.1 feet09/23/22 6.00 feet 4.00 feet TP 1 32x2' 45' ±60'±U.P. E. O . P . TEST PIT SKETCH PLAN NOT TO SCALE TEST PIT PERFORMED ON 10-21-22 BY MICHAEL PIMENTEL, EIT, CSE JC ENGINEERING, INC. FORM 11 - SOIL EVALUATOR FORM Page 1 of 4 Location Address or Lot No. On-site Review Deep Hole Number 2 Date: Time: Weather 50 F, Sunny Location (identify on site plan) Land Use Slope (%) Surface Stones: None Vegetation Landform Distances from: OpenWater Body feet Drainage way feet Possible Wet Area feet Property Line feet Drinking Water Well Other DEEP OBSERVATION HOLE LOG* Depth from Soil Horizon Soil Texture Soil Color Soil Other Surface (inches) (USDA) (Munsell) Mottling (Structure, Stones, Boulders, Consistency, % Gravel) * MINIMUM OF 2 HOLES REQUIRED AT EVERY PROPOSED DISPOSAL AREA Parent Material (geologic) Depth to Bedrock: Depth to Groundwater: Standing Water in the Hole:Weeping from Pit Face: Estimated Seasonal High Ground Water:3.3 feet BGS per C.C.C. Groundwater Adjustment Brush/Trees Outwash plain >100 feet A B C-1 72" - 120" C-2 Medium 96" BGS >120" BGS N/A 2.5Y 6/4 Sand Glacial Outwash Sand 5-10% gravel Loamy Sand 10Yr 3/1 Loamy 18" - 72" > 10>100 Sand Coarse 2.5Y 6/6 6" - 18" 10Yr 5/8 0" - 6" 2 - 5Commercial (Eversource site) loose 484 Willow Street, Yarmouth 12-30-22 > 100 11:00 AM N/A FORM 11 - SOIL EVALUATOR FORM Page 2 of 4 Location Address or Lot No. On-site Review Deep Hole Number 3 Date: Time: Weather 50 F, Sunny Location (identify on site plan) Land Use Slope (%) Surface Stones: None Vegetation Landform Distances from: OpenWater Body feet Drainage way feet Possible Wet Area feet Property Line feet Drinking Water Well Other DEEP OBSERVATION HOLE LOG* Depth from Soil Horizon Soil Texture Soil Color Soil Other Surface (inches) (USDA) (Munsell) Mottling (Structure, Stones, Boulders, Consistency, % Gravel) * MINIMUM OF 2 HOLES REQUIRED AT EVERY PROPOSED DISPOSAL AREA Parent Material (geologic) Depth to Bedrock: Depth to Groundwater: Standing Water in the Hole:Weeping from Pit Face: Estimated Seasonal High Ground Water:2.3 feet BGS per C.C.C. Groundwater Adjustment Sand Glacial Outwash >120" BGS 84" BGS N/A 5-10% gravel Sand 66" - 120" C-2 Medium 2.5Y 6/4 loose Sand 20" - 66" C-1 Coarse 2.5Y 6/6 Sand 8" - 20" B Loamy 10Yr 5/8 0" - 8" A Loamy 10Yr 3/1 Outwash plain > 100 N/A >100 > 10 >100 feet 484 Willow Street, Yarmouth 12-30-22 12:15 PM Commercial (Eversource site) 5 - 10 Brush/Trees FORM 11 - SOIL EVALUATOR FORM Page 3 of 4 Location Address or Lot No. Determination for Seasonal High Water Table Method Used: Depth observed standing in observation hole inches Depth weeping from side of observation hole inches Depth to soil mottles inches Ground water adjusted feet b.g.s. Index Well Number A1W-231 Reading Date Index well level 27.2' Adjustment factor Adjusted ground water level 3.30' b.g.s. Certification approved by the Department of Environmental Protection and that the above analysis was performed by me consistent with the required training, expertise and experience described in 310 CMR 15.017. Signature Michael Pimentel Date I certify that on Oct. 27, 1999 I have passed the soil evaluator examination 484 Willow Street, Yarmouth (TP 2) 12/31/2022 3.30 12/14/2022 4.70' FORM 11 - SOIL EVALUATOR FORM Page 4 of 4 Location Address or Lot No. Determination for Seasonal High Water Table Method Used: Depth observed standing in observation hole inches Depth weeping from side of observation hole inches Depth to soil mottles inches Ground water adjusted feet b.g.s. Index Well Number A1W-231 Reading Date Index well level 27.2' Adjustment factor Adjusted ground water level 2.30' b.g.s. Certification approved by the Department of Environmental Protection and that the above analysis was performed by me consistent with the required training, expertise and experience described in 310 CMR 15.017. Signature Michael Pimentel Date 4.70' I certify that on Oct. 27, 1999 I have passed the soil evaluator examination 12/31/2022 484 Willow Street, Yarmouth (TP 3) 2.30 12/14/2022 FORM 12 - PERCOLATION TEST Page 1 of 1 Location Address or Lot No. Percolation Test* Date: 12/30/2022 Time: 11:30 AM Observation Hole # Depth of Perc Start Pre-soak End Pre-soak Time at 12" Time at 9" Time at 6" Time (9"-6") Rate min./in Site Passed Site Failed Performed By: Witnessed By: Comments: < 2< 2 484 Willow Street, Yarmouth N/A (Drainage test pit purposes only) Poured 24 gallons of water; Unable to pre-soak for 15 mins. 11:37 AM 3 12:54 PM Michael Pimentel, E.I.T., C.S.E. COMMONWEALTH OF MASSACHUSETTS Yarmouth , Massachusetts 2 18" - 36" 11:30 AM 20" - 38" 12:45 PM HIGH GROUND-WATER LEVEL COMPUTATION Date: Site Location:Permit: Owner:Phone: Contractor:Phone: Notes: STEP 1 Date:0 mm/dd/yy feet below ls STEP 2 A) Appropriate index well B) Water-level range zone STEP 3 mm/yy STEP 4 0 STEP 5 0 NOTE*Tables 1-9 "Potential Water-Level Rise" are attached as worksheets to this file. Using Table of Potential Water Level Rise for index well (STEP 2A), current depth to water level for index well (STEP 3), and water-level zone (STEP 2B) determine water-level adjustment. Estimate depth to high water by subtracting the water-level adjustment (STEP 4) from measured depth to water level at site (STEP 1). Using monthly "Current Water Resources Conditions" determine current depth to water level for index well. Measure depth to water table to nearest 1/10 ft. (depth is in feet below land surface) Using Water-Level Range Zone and Index Well Map locate site and determine: monthly index well data: www.capecodcommission.org/wells.html 12-31-22 484 Willow Street Yarmouth, MA Eversource Robert B. Our (Excavator) Soil Evaluator: Michael Pimentel, EIT, CSE JC Engineering, Inc., 2854 Cranberry Highway, East Wareham, MA 02538 8.0012/30/22 A1W-231 5.00' - 5.99' 27.2 feet12/14/22 4.70 feet 3.30 feet TEST PIT #2 HIGH GROUND-WATER LEVEL COMPUTATION Date: Site Location:Permit: Owner:Phone: Contractor:Phone: Notes: STEP 1 Date:0 mm/dd/yy feet below ls STEP 2 A) Appropriate index well B)Water-level range zone STEP 3 mm/yy STEP 4 0 STEP 5 0 NOTE* Tables 1-9 "Potential Water-Level Rise" are attached as worksheets to this file. Using Table of Potential Water Level Rise for index well (STEP 2A), current depth to water level for index well (STEP 3), and water-level zone (STEP 2B) determine water-level adjustment. Estimate depth to high water by subtracting the water-level adjustment (STEP 4) from measured depth to water level at site (STEP 1). Using monthly "Current Water Resources Conditions" determine current depth to water level for index well. Measure depth to water table to nearest 1/10 ft. (depth is in feet below land surface) Using Water-Level Range Zone and Index Well Map locate site and determine: monthly index well data: www.capecodcommission.org/wells.html 12-31-22 484 Willow Street Yarmouth, MA Eversource Robert B. Our (Excavator) Soil Evaluator: Michael Pimentel, EIT, CSE JC Engineering, Inc., 2854 Cranberry Highway, East Wareham, MA 02538 7.0012/30/22 A1W-231 5.00' - 5.99' 27.2 feet12/14/22 4.70 feet 2.30 feet TEST PIT #3 December 2022 USGS OBSERVATION WELL DATA To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for estimating high groundwater levels on Cape Cod, Massachusetts. The following water level measurements are taken monthly and will be available approximately the first week of the following month. The Bulletin text, forms and maps are available online at: https://www.capecodcommission.org/our-work/estimating-high-groundwater-levels/ WELL WATER LEVEL Feet Below Land Surface DATE Index Adjustments WellDisplayName  Title Reading Zone A Zone B Zone C Zone D Zone E Reading Date Barnstable 231 AIW231 27.21 1.6 2.1 3.1 4.1 4.7 12/14/2022 Barnstable 247 AIW247R 27.24 3.5 5.3 7.1 8.8 12/14/2022 Brewster 21 BMW21R 12.21 3.2 4.8 12/9/2022 Chatham 138 CGW138R 28.16 2.7 4.1 5.5 6.8 12/9/2022 Mashpee 29 MIW29 9.21 2.3 3.5 4.7 5.8 12/14/2022 Sandwich 252 SDW252R 35.90 1.6 2.4 3.2 4.0 12/14/2022 Sandwich 253 SDW253R 49.46 3.9 5.8 7.7 12/14/2022 Truro 89 TSW89 11.83 1.6 2.4 3.2 12/9/2022 Wellfleet 17 WNW17R 12.94 2.5 3.3 4.9 12/9/2022 Microsoft Power BI  TP 1 32x2'± 45' ±60'±U.P. E. O . P . TEST PITS SKETCH PLAN NOT TO SCALE TEST PIT #1 PERFORMED ON 10-21-22 TEST PITS #2 & #3 PERFORMED ON 12-30-22 BY MICHAEL PIMENTEL, EIT, CSE JC ENGINEERING, INC. LOCATION & GROUND ELEVATIONS OF ALL TEST PITS SHOWN ON THIS PLAN ARE CONSIDERED APPROXIMATE ONLY AND WERE NOT LOCATED BY A FIELD INSTRUMENT SURVEY. TP 2 30x5'± TP 3 30x0'±48'±24' ± 29 . 0 '58.0' Soil Map—Barnstable County, Massachusetts (484 Willow Street, Yarmouth) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 1 of 346144604614470461448046144904614500461451046145204614530461454046145504614460461447046144804614490461450046145104614520461453046145404614550394880394890394900394910394920394930394940394950394960394970394980394990395000395010395020 394880 394890 394900 394910 394920 394930 394940 394950 394960 394970 394980 394990 395000 395010 395020 41° 40' 32'' N 70° 15' 46'' W41° 40' 32'' N70° 15' 40'' W41° 40' 29'' N 70° 15' 46'' W41° 40' 29'' N 70° 15' 40'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 19N WGS84 0 30 60 120 180 Feet 0 10 20 40 60 Meters Map Scale: 1:698 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:25,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Barnstable County, Massachusetts Survey Area Data: Version 19, Sep 9, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Sep 5, 2020—Sep 7, 2020 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—Barnstable County, Massachusetts (484 Willow Street, Yarmouth) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 11A Berryland mucky loamy coarse sand, 0 to 2 percent slopes 0.4 17.4% 259A Carver loamy coarse sand, 0 to 3 percent slopes 2.1 82.6% Totals for Area of Interest 2.5 100.0% Soil Map—Barnstable County, Massachusetts 484 Willow Street, Yarmouth Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 3 of 3 Map Unit Description The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions in this report, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named, soils that are similar to the named components, and some minor components that differ in use and management from the major soils. Most of the soils similar to the major components have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Some minor components, however, have properties and behavior characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Map Unit Description: Carver loamy coarse sand, 0 to 3 percent slopes---Barnstable County, Massachusetts 484 Willow Street, Yarmouth Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 1 of 4 Soils that have profiles that are almost alike make up a soil series. All the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of a given series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Additional information about the map units described in this report is available in other soil reports, which give properties of the soils and the limitations, capabilities, and potentials for many uses. Also, the narratives that accompany the soil reports define some of the properties included in the map unit descriptions. Barnstable County, Massachusetts 259A—Carver loamy coarse sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2y07s Elevation: 0 to 990 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Map Unit Description: Carver loamy coarse sand, 0 to 3 percent slopes---Barnstable County, Massachusetts 484 Willow Street, Yarmouth Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 2 of 4 Farmland classification: Not prime farmland Map Unit Composition Carver, loamy coarse sand, and similar soils:80 percent Minor components:20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Carver, Loamy Coarse Sand Setting Landform:Moraines, outwash plains Landform position (two-dimensional):Summit, shoulder Landform position (three-dimensional):Side slope, crest, tread Down-slope shape:Convex, linear Across-slope shape:Linear Parent material:Sandy glaciofluvial deposits Typical profile Oi - 0 to 2 inches: slightly decomposed plant material Oe - 2 to 3 inches: moderately decomposed plant material A - 3 to 7 inches: loamy coarse sand E - 7 to 10 inches: coarse sand Bw1 - 10 to 15 inches: coarse sand Bw2 - 15 to 28 inches: coarse sand BC - 28 to 32 inches: coarse sand C - 32 to 67 inches: coarse sand Properties and qualities Slope:0 to 3 percent Depth to restrictive feature:More than 80 inches Drainage class:Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat):Moderately high to very high (1.42 to 14.17 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 4.5 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3s Hydrologic Soil Group: A Ecological site: F149BY005MA - Dry Outwash Hydric soil rating: No Minor Components Deerfield Percent of map unit:10 percent Landform:Outwash terraces, outwash deltas, outwash plains, kame terraces Map Unit Description: Carver loamy coarse sand, 0 to 3 percent slopes---Barnstable County, Massachusetts 484 Willow Street, Yarmouth Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 3 of 4 Landform position (three-dimensional):Tread Down-slope shape:Linear Across-slope shape:Concave Hydric soil rating: No Hinckley Percent of map unit:5 percent Landform:Moraines, eskers, kames, outwash plains, kame terraces, outwash deltas, outwash terraces Landform position (two-dimensional):Shoulder, backslope, footslope, summit, toeslope Landform position (three-dimensional):Side slope, crest, head slope, nose slope, riser, tread Down-slope shape:Convex Across-slope shape:Convex Hydric soil rating: No Merrimac Percent of map unit:3 percent Landform:Kame terraces, outwash deltas, outwash terraces Landform position (three-dimensional):Riser, tread Down-slope shape:Linear Across-slope shape:Linear Hydric soil rating: No Mashpee Percent of map unit:2 percent Landform:Depressions, drainageways, terraces Landform position (three-dimensional):Tread Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes Data Source Information Soil Survey Area: Barnstable County, Massachusetts Survey Area Data: Version 19, Sep 9, 2022 Map Unit Description: Carver loamy coarse sand, 0 to 3 percent slopes---Barnstable County, Massachusetts 484 Willow Street, Yarmouth Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/22/2022 Page 4 of 4 Project 7211940 APPENDIX K OPERATION AND MAINTENANCE PLAN Project xxxxxxx 440 North Wells Street | Suite 320 | Chicago, Illinois 60654 312.324.5500 | fax 319.364.4251 | shive-hattery.com Long-term Pollution Prevention & Operation and Maintenance Plan Eversource Energy Yarmouth – Warehouse Yarmouth, MA | January 19th , 2022 Prepared For: Eversource Energy 484 Willow Street Yarmouth, MA 02673 Shive-Hattery Project Number: 3172201210 Owner Signature:______________________________________ Date:__________________________________________ Shive-Hattery Project Number: xxxxxxx Page 1 of 3 Project 3172201210 | Date – J anuary 19th, 2023 1. Stormwater Management System Owners and Party Responsible for Operation and Maintenance • Eversource Energy is the stormwater management system owner. • Eversource Energy is the party responsible for operation and maintenance and for financing operation and maintenance. Once the facility is constructed, Eversource Energy will provide the contact information for the individual(s) responsible for operation and maintenance. • Once the facility is constructed, Eversource Energy will determine where this Operation and Maintenance Manual will be permanently store on site. During construction this manual will be kept in the same location as the SWPPP (see SWPPP). 2. Good Housekeeping Procedures a. Good Housekeeping Procedures per the Town of Yarmouth Stormwater Regulations Section 2.05.2 • Wash vehicles at commercial car washes or on lawns or pervious areas using biodegradable and phosphate free detergent • Removal of sediment, leaf litter and other organic debris from impervious surfaces a minimum of twice a year in the spring (after snowmelt) and fall (after leaf fall) • Removal of sediment/debris from catch basin structures a minimum of once a year • Restrictions on the application of fertilizers, including: o Fertilizer shall not be applied during or immediately prior to heavy rainfall, such as but not limited to thunderstorms, hur ricanes, or northeastern storms, or when the soil is saturated due to intense or extended rainfall o Fertilizer shall not be applied between November 12 and the following March 31; o Fertilizer shall not be applied, spilled or deposited on impervious surfaces or in a manner that allows it to enter into storm drains o Fertilizer shall not be applied within 100 feet of any surface water or within the Zone I of a public drinking water well o Fertilizer containing phosphorus shall not be applied unless a soil test taken not more than three years before the proposed fertilizer application indicates that additional phosphorus is needed for growth of that turf, or unless establishing new turf or reestablishing or repairing turf after substantial damage or land disturbance. o A single application of fertilizer that contains nitrogen shall not exceed 1.0 pound of nitrogen per 1,000 square feet, shall consist of at least 20% slow-release nitrogen (SRN) fertilizer (NOTE: This represents the minimum percentage: use of higher SRN content is generally preferable, especially on sandy root zones, during stress and pre- stress periods, and when there are fewer annual applications of nitrogen made to a lawn) and the annual rate shall not exceed 3.2 pounds of actual nitrogen per thousand square feet. Single applications shall be done at intervals of no less than four weeks until the annual maximum is reached. o Grass clippings, leaves, or any other vegetative debris shall not be deposited into or within 50 feet of water bodies, retention and detention areas, drainage ditches or stormwater drains, or onto impervious surfaces, such as, but not limited to, roadways and sidewalks, except during scheduled clean-up programs. • Provide for routine inspection (at least annually) and maintenance of structural BMPs to remove sediment and debris. b. Additional Good Housekeeping Procedures • Routinely remove trash and debris from the parking lot and landscaped areas. Page 2 of 3 Project 3172201210 | Date – J anuary 19th, 2023 • General inspections shall be conducted after storm events greater than or equal to the 1-year. 24-hour storm event. • Use sand during winter months. Per the Town of Yarmouth standards, salt is not allowed. 3. Requirements for Routine Inspections and Maintenance of Stormwater BMPs a. Storm Sewer System • Inspect catch basins monthly and after storm events greater than or equal to the 1-year 24-hour storm event. • Catch basins shall be cleaned monthly. Any sediment and floatable pollutants shall be pumped from the basin and disposed of at an approved offsite facility in accordance with all applicable regulations. b. Hydrodynamic Separators • Routinely inspect the hydrodynamic separator (water quality unit) after storm events greater than or equal to the 1-year 24-hour storm event. • Follow manufacturer’s recommendations for typical maintenance. c. Infiltration Basin • Routinely remove trash and debris from the basin, at least once a month or more often if necessary. • Inspect the basin monthly, as well as after every major storm to ensure the basin is draining within 72 hours. • Inspect the basin semi -annually for settling, cracking erosion, leakage, tree growth on the embankments, and the condition of the vegetative cov er. • Mow the basin at least semi-annually to prevent woody growth, stimulate grass growth, and enhance nutrient removal . Do not mow when the ground is wet to avoid compaction of the bottom soils . • Inspect the basin semi -annually for sediment accumulation in the basin bottom. Remove accumulated sediment as necessary if it is negatively affecting the basin capacity and infiltration capability. When the soil is thoroughly dry, remove the top cracked layer of sediment, and till and re-seed the remaining soil. 4. Spill prevention and response plans • All reasonable precautions will be taken to prevent spills • If there is a spill event, the spilled material will be immediately directed away from stormwater intakes, infiltration basins, or drainage ways. The facility manager will be immediately notified to evaluate the spill and coordinate the necessary clean up. If necessary, soil remediation practices will be used. 5. Provisions for maintenance of lawns, gardens, and other landscaped areas • Routinely remove trash and debris from landscaped and vegetated areas. • Inspect landscaped areas and vegetative areas monthly to check health and density of plants. • Re-plant bare areas as necessary. • Apply erosion control measures if soil is exposed or erosion channels are forming. Page 3 of 3 Project 3172201210 | Date – J anuary 19th, 2023 6. Requirements for storage and use of fertilizers, herbicides, and pesticides • No pesticides are to be used unless a single spot treatment is required for a specific control application. • Refer to Town of Yarmouth’s Stormwater Regulations Section 2.05.2 for fertilizer application restrictions . 7. Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan • The owner (Eversource Energy) shall be responsible for training and/or hiri ng the appropriate personnel to implement the Long -Term Pollution Prevention Plan. 8. List of Emergency Contacts for implementing Long -Term Pollution Prevention Plan • The applicant (Eversource Energy) shall implement the Long -Term Pollution Prevention Plan and will create a list of emergency contacts once the site has been constructed. 9. Operation and Maintenance Log Form • Refer to attached Operation and Maintenance Log Form. Project 3172201210 OPERATION AND MAINTENANCE LOG FORM Inspection Date Inspector Name BMP Inspected Comments Recommendation Follow-up Inspection Required? (Yes/No) Project 7211940 APPENDIX L EROSION & SEDIMENT CONTROL PLAN (PREPARED BY OTHERS) Eversource ERP Staging Yard 484 Willow Street Yarmouth, Massachusetts Stormwater Pollution Prevention Plan Eversource Energy Januar y 2023 Table of Contents i Section 1 Introduction 1.1 Notice to Operators and Subcontractors ................................................ i Section 2 Contact Information/Responsible Parties 2.1 Operator(s)/ Subcontractor(s) .........................................................2-1 2.2 Stormwater Team ..........................................................................2-2 2.3 Plan Contents ................................................................................2-3 Section 3 Site Evaluation, Assessment, and Planning 3.1 Project/ Site Information .................................................................3-1 3.2 Discharge Information ....................................................................3-1 3.3 Nature of the Construction Activity ...................................................3-3 3.4 Sequence and Estimated Dates of Construction Activities ....................3-5 3.5 Allowable Non-Stormwater Discharges ..............................................3-7 3.6 Project Drawings ............................................................................3-7 Section 4 Documentation of Compliance with Other Federal Requirements 4.1 Endangered Species Protection ........................................................4-1 4.2 Historic Preservation .......................................................................4-3 4.3 Safe Drinking Water Act Underground Injection Control Requirements ..4-3 Section 5 Erosion and Sediment Controls 5.1 Natural Buffers or Equivalent Sediment Controls ................................5-1 5.2 Preserving Existing Vegetation .........................................................5-1 5.3 Perimeter Controls .........................................................................5-1 5.4 Sediment Track-Out .......................................................................5-3 5.5 Stockpiled Sediment or Soil .............................................................5-4 5.6 Minimize Dust ................................................................................5-4 5.7 Minimize the Disturbance of Steep Slopes .........................................5-5 5.8 Topsoil ..........................................................................................5-5 5.9 Soil Compaction .............................................................................5-6 5.10 Storm Drain Inlets .........................................................................5-6 5.11 Construction Stormwater Conveyance Channels ................................5-7 5.12 Chemical Treatment ......................................................................5-8 5.13 Dewatering Practices .....................................................................5-8 5.14 Site Stabilization ...........................................................................5-9 5.14.1 Seeding .............................................................................. 5-9 5.14.2 Mulching ............................................................................. 5-9 5.14.3 Erosion Control Mats or Blankets .......................................... 5-10 5.14.4 Surface Roughening ........................................................... 5-10 Table of Contents ii Section 6 Pollution Prevention Standards 6.1 Potential Sources of Pollution ...........................................................6-1 6.2 Spill Prevention and Response .........................................................6-1 6.2.1 Federal and State Spill Notification ......................................... 6-2 6.2.2 Local Notification .................................................................. 6-2 6.3 Fueling and Maintenance of Equipment or Vehicles .............................6-3 6.4 Washing of Equipment and Vehicles ..................................................6-3 6.5 Storage, Handling, and Disposal of Construction Products, Materials, and Wastes .........................................................................................6-4 6.5.1 Building Products ................................................................. 6-4 6.5.2 Pesticides, Herbicides, Insecticides, Fertilizers, and Landscaping Materials ............................................................................. 6-4 6.5.3 Diesel Fuel, Oil, Hydraulic Fluids, Other Petroleum Products, and Other Chemicals................................................................... 6-4 6.5.4 Hazardous or Toxic Waste ..................................................... 6-5 6.5.5 Construction and Domestic Waste .......................................... 6-6 6.5.6 Sanitary Waste .................................................................... 6-6 6.6 Washing of Applicators and Containers used for Paint, Concrete, or Other Materials .......................................................................................6-6 Section 7 Inspection and Corrective Action 7.1 Delegation of Authority ...................................................................7-1 7.2 Inspection Personnel and Procedures ................................................7-1 7.3 Corrective Action ............................................................................7-4 7.4 SWPPP Modifications .......................................................................7-5 Section 8 Turbidity Benchmark Monitoring for Dewatering Discharges 8.1 Turbidity Benchmark ......................................................................8-1 8.2 Reporting and Recordkeeping ..........................................................8-2 Section 9 Training Section 10 Certification and Notification 10.1 Notice of Intent (NOI) .................................................................. 10-2 10.2 Notice of Termination (NOT) .......................................................... 10-3 Section 11 Permit Conditions Applicable to Specific States, Indian Country Lands, or Territories 11.1 Commonwealth of Massachusetts ................................................... 11-4 J:\E\E5034 Eversource L&P 2019\188 - Yarmouth ERP Staging Site\SWPPP\Yarmouth ERP_SWPPP_draft.doc Table of Contents iii Appendices A Project Drawings B Copy of 2022 CGP C NOI and EPA Authorization Email D Inspection Forms E Corrective Action Forms F SWPPP Amendment Log G Subcontractor Certifications/Agreements H Sequence of Major Activities Earth Disturbing and Stabilization Activities I Training Log J Delegation of Authority K Discharge Information L Endangered Species Documentation M Permit Conditions Applicable to Specific States (Part 9 excerpt) N Filed Permits O Eversource Best Management Practices Manual Stormwater Pollution Prevention Plan 1-1 Section 1 Introduction Stormwater runoff from construction activities can have a significant impact on water quality. As stormwater flows over a construction site, it can pick up pollutants like sediment, debris, and chemicals and transport these to a nearby storm sewer system or directly to a river, lake, or coastal water. Polluted stormwater runoff can harm or kill fish and other wildlife. Sed imentation can destroy aquatic habitat, and high volumes of runoff can cause stream bank erosion. Debris can clog waterways and potentially reach the ocean where it can kill marine wildlife and impact habitat. The National Pollutant Discharge Elimination System (NPDES) stormwater program administered by the Environmental Protection Agency (EPA) requires construction site operators engaged in clearing, grading, and excavating activities that disturb one acre or more, including smaller sites in a larger common plan of development or sale, to obtain coverage under an NPDES permit for their stormwater discharges. The Construction General Permit (CGP) authorizes the discharge of stormwater pollution from construction activities in accordance with specified terms and conditions. All construction projects that propose to disturb one (1) or more acres of land must comply with the CGP. A construction project that is part of a larger common plan that will ultimately disturb one or more acres of land must also comply. This draft SWPPP has been prepared in accordance with the guidelines for the NPDES CGP for Stormwater Discharges from Construction Activity (2022, USEPA). This SWPPP addresses the Eversource ERP Staging Yard Project. Project Drawings are attached in Appendix A. A copy of the NPDES 2022 CGP for Construction Activities for which this SWPPP was prepared is attached in Appendix B. 1.1 Notice to Operators and Subcontractors Compliance with the CGP and its Standard Permit Conditions is the responsibility of the site Operator(s). An Operator is any party associated with a construction project that meets either of the following two criteria: 1. The party has operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications; or 2. The party has day-to-day operational control of those activities at a project which are necessary to ensure compliance with a SWPPP for the site or other permit conditions (e.g., they are authorized to direct workers at a site to carry out activities required by the SWPPP or comply with other permit conditions). The Operators have been identified under Section 2.1. Each Operator is responsible for compliance with the CGP, including supplementing the SWPPP with actual site conditions, best management practices, construction sequencing, inspections, and reports. Generally, compliance is achieved by: • Developing and implementing a Stormwater Pollution Prevention Plan (SWPPP). • Completing, certifying, and submitting a Notice of Intent (NOI) to the EPA. • Reading and complying with the requirements contained in the CGP. Section 1 Introduction Stormwater Pollution Prevention Plan 1-2 • Keeping the NPDES CGP and SWPPP on file at the Project field office or at an easily accessible location so that it can be made available at the time of an on- site inspection or upon request. The SWPPP will be kept current and shall be amended according to the conditions described in the CGP. • Post a sign or other notice which shall be located so tha t it is visible from the public road that is nearest the active part of the construction site, and it must use a font large enough to be readily viewed from a public right-of-way. At a minimum, the notice shall include: o The NPDES Permit tracking number. o A contact name and phone number for obtaining additional project information. o The URL for the SWPPP (if available); or the following statement: “If you would like to obtain a copy of the Stormwater Pollution Prevention Plan (SWPPP) for this site, contact the EPA Regional Office at (617) 918-1732”. o The following statement: “If you observe indicators of stormwater pollutants in the discharge or in the receiving waterbody, contact the EPA through the following website: https://www.epa.gov/enforcement/report- environmental-violations”. Prior to submitting the NOI, the Operator(s) shall be responsible for finalizing the SWPPP and verifying information presented herein including, but not limited to, the items listed below. Section 2.1 • Confirm contact information • Complete and keep updated subcontractor in formation, including completing Subcontractor Certification/Agreements in Appendix G for each subcontractor Section 2.2 • Confirm contact information • Acknowledge that Operator(s) have read the CGP and understand the applicable requirements. Indicate so in provided check box and date line Section 2.3 • At all times, maintain at least one hard copy of the Contract Documents including permits on-site or at an easily accessible location so that they can be made available at the time of an on-site inspection or upon request Section 3.3 • Complete Construction Support Activities section and locate on Project Drawings in Appendix A Section 3.4 • In Appendix H, complete the sequence of activities form and attach preliminary project work schedule. Any changes in construction sequence shall be documented as needed Section 1 Introduction Stormwater Pollution Prevention Plan 1-2 Section 3.5 • Review and update the list of Allowable Non-Stormwater Discharges and identify locations on the Project Drawings in Appendix A Section 3.6 • Complete Section 3.6 Section 5 • A general description of typical erosion and sediment controls are provided. The Contractor shall review and update this section, as needed, to meet the CGP requirements and the Contract Document requirements Section 7.1 • If the SWPPP operator contact identified in Section 2.1 will not be responsible for day-to-day SWPPP compliance, identify the Stormwater Manager/Inspector (person) and complete the Delegation of Authority form included in Appendix J Section 8 • Complete Section 8 Section 9 • Complete Table 9-1 and Training Log(s) in Appendix I Section 10 • Operator(s) shall sign and date the SWPPP certification statements • Each Operator shall complete an NOI online • Completed NOI and authorization email shall be attached in Append ix C To ensure permit compliance, the Operator(s) will need to: keep up to date and modify the SWPPP as needed to reflect the actual site conditions; follow the sediment and erosion control requirements; and conduct inspections, corrective actions, and spill prevention procedures. Until coverage is terminated under this permit, the Operator(s) are required to continue to comply with all conditions and requirements in the permit. To terminate permit coverage, all Operators must submit to EPA a com plete and accurate Notice of Termination (NOT), which certifies an Operator has met the requirements for termination as listed in Part 8 of the CGP (see Section 10.2). Lastly, this draft SWPPP was prepared by Tighe & Bond to meet the requirements of the CGP and provide a template for the Operator to use to comply with the CGP. Unless otherwise identified in the SWPPP, the site Operators are responsible for permit compliance. Stormwater Pollution Prevention Plan 2-1 Section 2 Contact Information/Responsible Parties 2.1 Operator(s)/ Subcontractor(s) Operator(s): Company or Organization Name: Eversource Energy Service Company Name: James Clancy Address: 247 Station Drive City, State, Zip: Westwood, MA, 02090 Telephone Number: (781) 441-8159 Fax/Email: James.Clancy@eversource.com Area of Control: Operator – Operational control of project plans and specifications Company or Organization Name: Olsen Construction Services Name: Nick Olsen Address: 21 Deming Road City, State, Zip: Berlin, CT 06037 Telephone Number: (860) 610-1093 Fax/Email: nolsen@olsencs.com Area of Control: General Contractor – Day-to-day operational control of the project site activities Emergency 24-Hour Contact: Company or Organization Name: Eversource Energy Name: James Clancy Telephone Number: (781) 441-8159 Subcontractor(s): All subcontractors to complete Subcontractor Certification/ Agreements in Appendix G. Completed copies shall be maintained in Appendix G Company or Organization Name: Name: Address: City, State, Zip: Telephone Number: Fax/Email: Area of Control*: Section 2 Contact Information/Responsible Parties Stormwater Pollution Prevention Plan 2-2 2.2 Stormwater Team The duties of these personnel include one or more the following: 1. Prepare the draft SWPPP 2. Review and provide comments on draft SWPPP 3. Finalize the SWPPP 4. Certify NOI 5. Post a sign or other notice at project site 6. Implement the SWPPP 7. Oversee maintenance practices identified in Sections 5, 6 and 7 of the SWPPP 8. Conduct or provide for inspection and monitoring activities 9. Identify other potential pollutant sources and ensure that they are added to the SWPPP 10. Identify any amendments to the SWPPP necessitated by field conditions and ensure they are implemented 11. Ensure that design changes during construction are addressed in the SWPPP 12. Provide SWPPP training as identified in Section 7 of the SWPPP Stormwater Team Name/Position and Contact Information Responsibilities I Have Completed Training Required by CGP Part 6.2 I Have Read the CGP and Understand the Applicable Requirements Amanda J. Houle, Senior Environmental Scientist 2, 3 Yes Yes Date: _01/13/2023_ Tighe & Bond No (508) 304-6354 ajhoule@tighebond.com Kasia Kos, Environmental Scientist 1, 8 Yes Yes Date: _01/13/2023_ Tighe & Bond No (508) 304 6348 kkos@tighebond.com James Clancy, Associate Environmental Specialist 4, 9-11 Yes Yes Date: _01/13/2023_ Eversource No (781) 441-8159 james.clancy@eversource.com Section 2 Contact Information/Responsible Parties Stormwater Pollution Prevention Plan 2-3 Stormwater Team Members Who Conduct Inspections Pursuant to CGP Part 4 Name/Position and Contact Information Training(s) Received Date Training(s) Completed If Training is a Non-EPA Training, Confirm that it Satisfies the Minimum Elements of CGP Part 6.3.b Amanda Houle, Project Manager None Date: TBD ☐ Principles and practices of erosion and sediment control and pollution prevention practices at construction sites ☐ Proper installation and maintenance of erosion and sediment controls and pollution prevention practices used at construction sites ☐ Performance of inspections, including the proper completion of required reports and documentation, consistent with the requirements of Part 4 Tighe & Bond (508) 304-6348 AJHoule@tighebond.com Kasia Kos, Environmental Scientist Construction Inspection Training Course Date: January 2023 ☐ Principles and practices of erosion and sediment control and pollution prevention practices at construction sites ☐ Proper installation and maintenance of erosion and sediment controls and pollution prevention practices used at construction sites ☐ Performance of inspections, including the proper completion of required reports and documentation, consistent with the requirements of Part 4 Tighe & Bond (339) 235-5614 KKos@tighebond.com 2.3 Plan Contents This SWPPP was developed for the Eversource ERP Staging Yard Project in Yarmouth, Massachusetts. Referenced documents within the narrative are considered inclusive to this SWPPP and will be retained on-site. These documents are as follows: Document Availability Site Plans Eversource Energy – Staging Areas, Yarmouth, Massachusetts, dated 9/2/22. SWPPP – Appendix A Best Management Practices Manual Eversource Energy, dated April 2022. (hereafter referred to as BMPs) SWPPP – Appendix Q Stormwater Pollution Prevention Plan 3-1 Section 3 Site Evaluation, Assessment, and Planning 3.1 Project/ Site Information Project Name and Address Project/Site Name: Eversource ERP Staging Yard Project Street/Location: 484 Willow Street City: Yarmouth State: Massachusetts ZIP Code: 02673 County or Similar Subdivision: Barnstable County Business days and hours for the project Monday through Friday 7:00 AM to 5:00 PM Latitude: 41.675729º N Longitude: -70.263697º W Method for determining latitude/longitude: USGS topographic map (specify scale: ) EPA Web site GPS Other (please specify): ___Google Maps______ Horizontal Reference Datum: NAD 27 NAD 83 or WGS 84 Unknown If you used a U.S.G.S topographic map, what was the scale? ______ ____________________________ Additional Project Information Is the project/site located on Indian country lands, or located on a property of religious or cultural significance to an Indian tribe? Yes No Are earth-disturbing activities in response to a public emergency? Yes No Are you applying for permit coverage as a “federal operator” as defined in Appendix A of the 2022 CGP? Yes No 3.2 Discharge Information Does your project/site discharge stormwater into a Municipal Separate Storm Sewer System (MS4)? Yes No Are there any surface waters that are located within 50 feet of your construction disturbances? Yes No Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-2 The project site discharges to one water, as identified in Table 3-1 below and in the Project Drawings in Appendix A. TABLE 3-1 Names of Receiving Waters Name(s) of the first surface water that receives stormwater directly from your site1 001. Tributary to Hawes Run 1 For discharges that enter a storm sewer system prior to discharge, the first surface water to which you discharge is the waterbody that receives the stormwater discharge from the storm sewer system (CGP Part 3.2, Note) 2 Multiple rows provided where your site has more than one point of discharge that flows to different surface waters. Impaired Waters The EPA’s National Summary of Impaired Waters and TMDL Information website was used to determine if the receiving waters are impaired (https://watersgeo.epa.gov/mwm/). Documentation of Discharge Information is attached in Appendix K. As shown in Table 3- 2 below, one of the water(s) in the project area are impaired for sediment or nutrients1. TABLE 3-2 Impaired Waters / TMDLs (Answer the following for each surface water listed in Table 3-1 above) ID Is this surface water listed as “impaired” for sediment or nutrients1? If you answered yes, then answer the following: Cause of Impairment2 Cause of Impairment Group3 Has a TMDL been completed? Title of the TMDL document Pollutant(s) for which there is a TMDL 001 YES NO N/A N/A YES NO N/A N/A 1 “…a water identified by the State, Tribe, or EPA as not meeting an applicable water quality standard and (1) requires development of a TMDL (pursuant to section 303(d) of the CWA; or (2) is addressed by an EPA- approved or established TMDL; or (3) is not in either of the above categories but the waterbody is covered by a pollution control program that meets the requirements of 40 CFR 130.7(b)(1).” Discharge to a surface water that is impaired for (1) sediment or sediment related parameter, such as TSS or turbidity, and/or (2) nutrients, including impairments for nitrogen and/or phosphorus…If you discharge to an impaired water that is impaired for a parameter other than a sediment-related parameter or nutrient, EPA will inform you if any additional limits or controls are necessary…” (CPG, Part 3.2). 2 Description of the cause of impairment. This value is reported by the state. 3 Description of the parent cause of impairment. The parent cause of impairment represents an EPA-assigned, general categorization for the specific, state-reported impairment cause. This is the value to be entered into the NOI online. Tier 2, 2.5, 3 Waters MassDEP’s website and 314 CMR 4.00 - Surface Water Quality Standards were used to determine if the project discharges to a Tier water. Per Part 3.2 of the CGP Tier 2, 2.5, and 3 waters are identified and listed in the Massachusetts Water Quality Standards 314 CMR 4.00. Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-3 • Tier 2 – Listed as “High Quality Waters” and all wetlands that are not designated as an Outstanding Resource Water • Tier 2.5 – Listed as “Outstanding Resource Water”, “Public Water Supply,” “Tributary to Public Water Supply,” all wetlands bordering Outstanding Resource Waters, and vernal pools • Tier 3 – Defined as “Special Resource Water.” Note: No waters have been identified as a Special Resource Water as of the issuance of this permit As shown in Table 3-3 below, the receiving water is not listed in 314 CMR 4.00. Documentation of Discharge Information is attached in Appendix K. TABLE 3-3 Tier 2, 2.5, or 3 Waters (Answer the following for each surface water listed in Table 1 above) 314 CMR 4.06 Is this surface water designated as a Tier water? If you answered yes, specify which Tier (2, 2.5, or 3)? ID Class Qualifiers 001 N/A N/A YES NO Tier 2 Summary - Sensitive Waters A portion of the site discharges to a sediment or nutrient-impaired water and/or Tier 2, Tier 2.5, or Tier 3 waters. These locations are identified on the Project Drawings included in Appendix A. 3.3 Nature of the Construction Activity General Description of Project Eversource Energy is proposing to construct an emergency response staging area on an undeveloped portion of the Yarmouth Work Center. Approximately four acres of forested land will be converted into a paved staging area to be used for storm and emergency response staging. The proposed work will not occur within jurisdictional wetland resource areas and will disturb more than one acre of land. Business Days and Hours for Project The business days and hours for this project are Monday through Friday, 7:00 AM to 5:00 PM Size of Construction Project Total size of the property: 6 acres Total area expected to be disturbed by the construction activities: 4 acres The maximum area expected to be disturbed at any one time: 4 acres Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-4 Type of Construction Site (check all that apply): Single-Family Residential Multi-Family Residential Commercial Industrial Institution Highway or Road Utility Other ______________________________ Will there be demolition of any structure built or renovated before January 1, 1980? Yes No If yes, do any of the structures being demolished have at least 10,000 square feet floor space? Yes No N/A Was the pre-development land use used for agriculture (see Appendix A of the CGP for definition of “agricultural land”)? Yes No TABLE 3-4 Pollutant-Generating Activities Pollutant-Generating Activity Pollutants or Pollutant Constituents (that could be discharged if exposed to stormwater) Site work Soil particles and fines Paving and construction areas Petroleum, concrete, vehicle fluids, paints, solvents Concrete construction Concrete Pavement marking Paint Solid waste storage Construction debris, trash Equipment use Hydraulic Oils/fluids Equipment use Antifreeze/coolant Portable toilets Sewage Staging areas Sediment, gasoline, fuel oil, concrete, vehicle fluids, paints, solvents, fertilizers, adhesives, antifreeze/coolant, hydraulic oil/fluid, etc. Best Management Practices The Operators will adhere to the following procedures and Best Management Practices (BMPs) when conducting the construction work described herein and as set forth in the Project Drawings and Project Specifications. • Mark sensitive resource areas (e.g., wetlands) and restricted access areas in the field. Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-5 • Install a perimeter controls, representing the limit of disturbance, prior to the commencement of work. No construction activity will occur beyond the limit of disturbance, thereby minimizing disturbance to sensitive areas. • Use appropriate erosion and sedimentation controls during construction and maintain stormwater controls throughout construction activities. • Protect and maintain existing vegetation wherever possible. • Minimize construction disturbance by using existing disturbed areas to the extent possible. • Minimize the time disturbed areas are left unstabilized. • To the extent possible, route unpolluted flows around disturbed areas. • Provide an on-site Environmental Monitor during construction. • The Contractor shall take all reasonable precautions to prevent leaks of oil, fuel, or fluid. These precautions shall consist of minimum daily checks for leakage. Any leak found shall be repaired as soon as possible. Equipment found to be in improper condition shall not be moved on-site until repaired at an appropriate location. • The Contractor shall keep on-site, in good condition, materials required for cleaning fluid spills, such as absorbent pads or powder. • Any leaks or spillage shall be reported to appropriate authorities as soon as feasible. • Stabilize and revegetate disturbed areas as soon as practicable. • Inspect restored areas to verify success of restoration. 3.4 Sequence and Estimated Dates of Construction Activities Preliminary Project Work Schedule Preliminary work schedule can be found in Appendix H. It will be updated or amended with projected and actual dates as work progresses. The following summarizes estimated dates for permitted activities: Activity Estimated Date/ Date Range Conduct pre-construction conferences with Contractor, Municipality, Engineer and the Owner’s representative to review permit requirements and BMPs prior to the start of construction February 2023 Conduct pre-construction and post-installation site walk(s) with Conservation Commission February – December 2023 Place erosion controls including, but not limited to, the perimeter controls, temporary sediment traps, temporary diversion swale/berm, and temporary inlet protections as February – December 2023 Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-6 shown on the Project Drawings. Install construction entrance track-out pad. Conduct post-erosion control installation site walk with Conservation Commission February – December 2023 Clear and Grub Site February – December 2023 Strip and stockpile the top and subsoil as indicated on the plans. Phase construction activities to limit the area of exposed soil and duration of exposure. February – December 2023 Temporarily stabilize February – December 2023 Concrete pour of building slab February – December 2023 Temporary seed of excavated earth February – December 2023 Install other proposed site improvements February – December 2023 Fine grade all disturbed areas February – December 2023 Reove excess stockpile material and dispose of off-site in accordance with all local, state, and federal regulations February – December 2023 Restore the temporary stockpile area to meet or exceed pre- existing conditions February – December 2023 Loam, plant, and seed all disturbed areas February – December 2023 Final paving of parking lots and access roads February – December 2023 Remove the temporary construction entrance and erosion controls following the stabilization of upstream areas February – December 2023 Restore areas beneath the removed erosion controls February – December 2023 Complete Notice of Termination (NOT) per Section 10.2 December 2023 Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-7 3.5 Allowable Non-Stormwater Discharges TABLE 3-5 List of Allowable Non-Stormwater Discharges Present at the Site1 Type of Allowable Non-Stormwater Discharge Likely to be Present at Your Site? Location on Site Discharges from emergency fire-fighting activities YES NO Fire hydrant flushing YES NO Landscape irrigation YES NO Waters used to wash vehicles and equipment2 YES NO Off-site Water used to control dust YES NO Throughout site Potable water including uncontaminated water line flushing YES NO External building wash down, provided soaps, solvents, and detergents are not used, and external surfaces do not contain hazardous substances (e.g., see Appendix A of the CGP) (e.g., paint or caulk containing PCBs) YES NO Pavement wash waters3 YES NO Throughout site Uncontaminated air conditioning or compressor condensate YES NO Uncontaminated, non-turbid discharges of ground water or spring water YES NO Foundation or footing drains4 YES NO Construction dewatering water5 YES NO Where necessary throughout site** 1 Identify the likely locations of these authorized non-stormwater discharges on Project Drawings. See Section 3.6 below 2 Provided that there is no discharge of soaps, solvents, or detergents used for such purposes 3 Provided spills or leaks of toxic or hazardous substances have not occurred (unless all spill material has been removed) and where soaps, solvents, and detergents are not used. You are prohibited from directing pavement wash waters directly into any water of the U.S., storm drain inlet, or stormwater conveyance, unless the conveyance is connected to a sediment basin, sediment trap, or similarly effective control 4 Where flows are not contaminated with process materials sucks as solvents or contaminated ground water 5 Discharged in accordance with CGP Part 2.4 ** No untreated or contaminated groundwater will be discharged to wetlands or waterways. Excess water will be discharged overland in upland areas and allowed to naturally infiltrate in well-drained soils. 3.6 Project Drawings Appendix A contains the flowing plan sheets, from the Construction Plans, which serve as the basis for the preparation of the SWPPP Project Drawings: • Locus Sheet Index Sheet • Existing Conditions Sheet Sheet 1-5 Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-8 • Proposed Work Sheet Sheet 1-5 • Erosion & Sediment Control Plan Sheet C250 The Operator(s) shall use these sheets to create a site map or series of maps showing the following information: TABLE 3-6 List of Project Drawing Items Required information to be shown on Project Drawings Completed by draft SWPPP Preparer* Reviewed, Completed or Updated by Operator(s)** Boundaries of the property Sheet 1 Locations where earth-disturbing activities will occur, noting any phasing of construction activities and any demolition activities Sheet 1 Approximate slopes before and after major grading activities. Note areas of steep slopes, as defined in Appendix A of the CGP N/A Locations where sediment, soil, or other construction materials will be stockpiled Sheet 1-5 Locations of any crossings of receiving waters Sheet 1-5 Designated points on the site where vehicles will exit onto paved roads Sheet 1-5 Locations of structures and other impervious surfaces upon completion of construction Sheet 1-5 Locations of on-site and off-site construction support activity areas covered by the permit (see CGP Part 1.2.1.c) N/A Locations of any receiving waters, including wetlands, within your site and all receiving waters within one mile downstream of the site’s discharge point(s). Indicate which receiving waters are listed as impaired, and which are identified by your State, Tribe, or EPA as Tier 2, Tier 2.5, or Tier 3 waters Sheet 1-5 The boundary lines of any natural buffer areas. See CGP Part 2.1.2.1.a Sheet 1-5 Areas of federally-listed critical habitat for endangered or threatened species Appendix L Topography of the site, existing vegetative cover (e.g., forest, pasture, pavement, structures), and drainage pattern(s) of stormwater and allowable non-stormwater flow onto, over, and from the site property before and after major grading activities. Sheet 1-5 Locations where stormwater or allowable non-stormwater will be discharged to receiving waters (including wetlands) N/A Locations of any storm drain inlets on the site and in the immediate vicinity of the site N/A Locations of all potential pollutant-generating activities Sheet 1-5 Section 3 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 3-9 TABLE 3-6 List of Project Drawing Items Required information to be shown on Project Drawings Completed by draft SWPPP Preparer* Reviewed, Completed or Updated by Operator(s)** Designated areas where construction wastes that are covered by the exception in Part 2.3.3e.ii (i.e., they are not pollutant- generating) will be stored N/A Locations of stormwater control measures Sheet 1-5 Locations where polymers, flocculants, or other treatment chemicals will be used and stored N/A *Completed by SWPPP Preparer – Already shown on Project Drawings or information added by draft SWPPP preparer **Completed or Updated By Operator(s) – Operator shall confirm and/or revise to finalize SWPPP. Revise table and Project Drawings, as needed, during progress of work. Conditions on-site may vary, and the Operator(s) may make changes during construction. Changes on-site during construction must be updated not only in the SWPPP but on the Project Drawings. Operator(s) is/are directed to the CGP Part 7.2.4 for more information on preparing and keeping up to date the Project Drawings. Stormwater Pollution Prevention Plan 4-1 Section 4 Documentation of Compliance with Other Federal Requirements 4.1 Endangered Species Protection Eligibility Criterion Under which criterion listed in Appendix D of the 2022 CGP are you eligible for coverage under this permit? A B C D E Supporting Documentation See Appendix L for all documentation including: 1. CGP Appendix D Checklist 2. NMFS Mapping and Report 3. USFWS Mapping and Report Criterion C: Discharges not likely to result in any short- or long-term adverse effects to ESA-listed species and/or designated critical habitat. ESA-listed species and/or designated critical habitat(s) under the jurisdiction of the USFWS and/or NMFS are likely to occur in or near your site’s “action area,” and you certify to EPA that your site’s discharges and discharge-related activities are not likely to result in any short- or long-term adverse effects to ESA-listed threatened or endangered species and/or designated critical habitat. This certification may include consideration of any stormwater controls and/or management practices you will adopt to ensure that your discharges and discharge-related activities are not likely to result in any short- or long-term adverse effects to ESA-listed species and/or designated critical habitat. To certify your eligibility under this criterion, indicate 1) the ESA-listed species and/or designated habitat located in your “action area” using the process outlined in Appendix D of this permit; 2) the distance between the site and the listed species and/or designated critical habitat in the action area (in miles); and 3) a rationale describing specifically how short- or long-term adverse effects to ESA-listed species will be avoided from the discharges and discharge- related activities. (Note: You must include a copy of your Project Drawings from your SWPPP showing the upland and in-water extent of your “action area” with your NOI). Basis statement: The United States Fish and Wildlife Service's IPaC online tool was consulted in January 2023 for the presence of Threatened and Endangered species. Upon review, the action area was determined to be within the range of t he northern long-eared bat (Myotis septentrionalis; Endangered) and the sandplain gerardia (Agalinis acuta; Endangered). It was determined that the action area would not impact either species as no critical habitat was been designated in the vicinity of the project site. Although tree clearing will occur, roosting trees for the northern Section 4 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 4-2 long-eared bat are not present and all tree-clearing will occur outside the active period (April – October) for this species. The National Marine Fisheries Service's Greater Atlanti c Region ESA Section 7 Mapper was consulted in August 2022 for the presence of Threatened and Endangered species. Upon review, there are no NMFS-protected species or critical habitat in the action area. Check the applicable source(s) of information you relied upon: ✓ Resources used to make determination: USFWS IPaC Online Tool, USFWS Species Determination Table for Endangered Species Project Review, NMFS Greater Atlantic Region ESA Section 7 Mapper ✓ ESA-listed Species/Critical Habitat in action area: Northern long-eared bat (Myotis septentrionalis), Sandplain Gerardia (Agalinis acuta), monarch butterfly (Danaus plexippus) ✓ Distance between site and ESA-listed Species/Critical Habitat: 0 miles ✓ How adverse effects will be avoided: No roosting trees are present in the vicinity of the project site. Trees will be cleared outside of the active period of the northern long-eared bat. Training for all crew members will be provided prior to construction activities. Proper erosion and sedimentation control measures will be implemented to avoid impacts to potential habitat. Section 4 Site Evaluation, Assessment, and Planning Stormwater Pollution Prevention Plan 4-3 4.2 Historic Preservation The project work consists of installing ground-disturbing stormwater controls. 2022 CGP Appendix E, Step 1 Do you plan on installing any of the following stormwater controls at your site? _Yes_ Check all that apply below, and proceed to Appendix E, Step 2. Dike Berm Catch Basin Pond Stormwater Site Drainage Feature (e.g., ditch, trench, perimeter drain, swale, etc.) Culvert Channel Other type of ground-disturbing stormwater control: 2022 CGP Appendix E, Step 2 If you answered yes in Step 1, have prior professional cultural resource surveys or other evaluations determined that historic properties do n ot exist, or have prior disturbances at the site precluded the existence of historic properties? YES NO • If yes, provide documentation of the basis for your determination. A desktop review of the Massachusetts Historic Commission Inventory was reviewed and it was determined no areas of historical significance are present at the project site. 4.3 Safe Drinking Water Act Underground Injection Control Requirements Do you plan to install any of the following controls? Check all that apply be low. Infiltration trenches (if stormwater is directed to any bored, drilled, driven shaft or dug hole that is deeper than its widest surface dimension, or has a subsurface fluid distribution system) Commercially manufactured pre-cast or pre-built proprietary subsurface detention vaults, chambers, or other devices designed to capture and infiltrate stormwater flow Drywells, seepage pits, or improved sinkholes (if stormwater is directed to any bored, drilled, driven shaft or dug hole that is deeper than its widest surface dimension, or has a subsurface fluid distribution system) There are no controls to be installed as part of this project as identified in the 2022 CGP Part 7.2.9. Stormwater Pollution Prevention Plan 5-1 Section 5 Erosion and Sediment Controls Site Operator(s) must implement erosion and sediment controls in accordance with the following requirements to minimize the discharge of pollutants in stormwater from construction activities. This project also includes site specific controls and permit conditions which may take precedent and are not included in the following descriptions. The Operator(s) shall also comply with the requirements in the project’s permits which are provided in the Contract Documents. 5.1 Natural Buffers or Equivalent Sediment Controls Are there any receiving waters within 50 feet of your project’s earth disturbances? YES NO 5.2 Preserving Existing Vegetation The preservation of existing vegetation (groundcover, vines, shrubs, trees) will be employed within the work area wherever possible, primarily to increase soil stability and decrease the amount and velocity of runoff. This also includes identification and protection of certain trees either for aesthetic or erosion and sediment control benefits. 5.3 Perimeter Controls A perimeter control representing the limit of disturbance will be installed prior to the commencement of work. No construction activity will occur beyond the limit of disturbance, thereby minimizing adverse effects to sensitive resource areas. Where the work area is located adjacent to or near a resource area, erosion controls will also function as perimeter controls. General Wetland resource areas in close proximity to the proposed project area will be protected by a row of erosion control barriers. The erosion control barriers will consist of straw wattles, mulch-filled tubes (e.g., compost filter tubes/socks), or other similarly effective devices placed in a fashion that restricts the contractor(s) to the areas necessary to conduct the work and will define the limits of work. The locations of these barriers are shown on the project drawings. Specific Perimeter Controls Silt Fence and Straw Wattles/Compost Filter Socks Silt fence and straw wattles/compost filter socks are used as an erosion control device to slow runoff velocities, entrain suspended sediments, and promote vegetation growth until an area is stabilized. They are not generally intended for steep slopes, but rather, to stabilize low to moderate grades where there is a broad area of disturbance. They should be placed lengthwise, perpendicular to the direction of runoff. Straw wattles/compost filter socks may also be used along wetland resource areas to protect areas before vegetation has stabilized disturbed soils. Filter socks are constructed from a biodegradable mesh sock stuffed with compost filter media. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-2 • Perimeter controls shall be installed downgradient of construction activities. Perform work in accordance with Eversource Best Management Practices. Installation • Temporary erosion control measures shall be installed prior to the start of any earth disturbing activities. • Erosion control barriers shall not be removed until their removal is approved by the Engineer or Owner. • Sediment controls shall be installed along any perimeter areas of the site that are downslope from any exposed soil or other disturbed areas. • To prevent stormwater from circumventing the edge of the perimeter control, install the perimeter control on the contour of the slope and extend both ends of the control up slope (e.g., at 45 degrees) forming a crescent rather than a straight line. Maintenance Requirements • The contractor(s) will be required to maintain a reserve supply of erosion control barriers on-site to make repairs, as necessary. • Perimeter control shall be inspected immediately after each rainfall and at least daily during prolonged rainfall. They shall be repaired if there are any signs of erosion or sedimentation below them, any repairs shall be made immediately. If there are signs of undercutting at the cen ter or the edges, or impounding of large volumes of water behind them, sediment barriers may be replaced with a temporary check dam. • After a storm event, if there is any evidence of stormwater circumventing or undercutting the perimeter control, the control will be extended and undercut areas repaired. • Should the fabric on a barrier decompose or become ineffective prior to the end of the expected usable life and the barrier still is necessary, the fabric shall be replaced promptly. • Sediment deposits should be removed after each storm event. They must be removed when deposits reach approximately 1/3 the height of the barrier. • After a storm event, if there is evidence of stormwater circumventing or undercutting the perimeter control, extend control and/or repair undercut areas to fix the problem. At the conclusion of the project, the erosion control barriers will be removed and properly disposed off-site following the stabilization of disturbed areas and Conservation Commission authorization. Straw Bales Staked straw bales can be utilized as erosion control barriers. They are staked in a line around perimeters of disturbed areas, especially those adjacent to wetlands, waterways, roadways or at the base of slopes. Perimeter barriers intercept, filter, and reduce the velocity of stormwater run-off. • Perform work in accordance with Eversource Best Management Practices. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-3 • See Installation and Maintenance requirements under Silt Fence and Straw Wattles/Compost Filter Socks. 5.4 Sediment Track-Out General It is the site contractor/project manager’s responsibility to take measures to prevent tracking of sediment from the utility trenches, sidewalk and curb removal areas, and other excavation locations. It is also the contractor/project manager’s responsibility to take measures to prevent tracking of sediment from the stagin g and material storage area. A street sweeping apparatus shall be used as necessary to minimize the track-out of sediment onto off-site streets, other paved areas, and sidewalks from vehicles exiting the construction site. Specific Track-Out Controls A stone construction entrance track pad will be installed where the construction area connects to paved roads to limit construction machinery from tracking soil onto paved roadways. Procedures should be established to ensure soils are not tracked off-site and restricting vehicle use to properly designated exit points. Muddy conditions may warrant the use of a tire wash station. If the track pad becomes clogged with soil, stone may need to be removed and refreshed and/or cleaned as needed. Materials appropriate to construction site soil conditions should be employed and/or replenished, as necessary. The proposed location of the construction entrance track pad is depicted on the Project Drawings. • Perform work in accordance with Eversource Best Management Practices. Installation • At access road entrances from public roadways, sediment track out control includes but is not limited to the use of aggregate stone with an underlying geotextile or non-woven filter fabric or turf mats. Maintenance Requirements • The exits shall be maintained in a condition, which will prevent tracking of sediment onto the public right-of-way. When washing is required, it shall be completed in an area stabilized with aggregate which drains into an approved sediment trapping device. • If sediment is tracked out from the site to the surface of off-site streets, other paved areas, and sidewalks, the site contractor/project manager shall remove the deposited sediment by the end of the same work day in which the track-out occurs or by the end of the next work day if track-out occurs on a non-work day. • Tracked-out sediment shall be removed by sweeping, shoveling, or vacuuming or by using other similarly effective means of sediment removal. • All sediment shall be prevented from entering any constructed or natural site drainage feature, storm drain inlet, or receiving water. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-4 5.5 Stockpiled Sediment or Soil General Stockpiles are to be located as far as possible from any constructed or natural site drainage features, storm drain inlets, and areas where stormwater flow is concentrated. Soil stockpiles shall be protected from contact with stormwater using a temporary sediment barrier, such as a compost filter sock. Any stockpiles of loose materials shall be properly stabilized to prevent erosion and sedimentation. Place, grade, and shape stockpiles to drain surface water within the approved stockpile and material laydown locations. Take care to not store within the drip line of remaining trees. Stockpiles can be covered with sheets of plastic/tarp to minimize windblown dust. Stockpiled erodible materials that will not be used for greater than 14 days shall be stabilized with temporary seed immediately following placement. Specific Stockpile Controls Description • Temporary stockpiles of excavated soil will be placed at material storage locations in accordance with the Eversource Best Management Practices. Installation • Install a sediment barrier, silt fencing or straw bales, along downgradient perimeter areas of stockpiled soil or land clearing debris piles. • For piles that will be unused for 14 or more days, s ediment and erosion controls and/or cover shall be used on stockpiles to minimize the discharge of sediment or soil particles from discharging to any receiving water. Temporary stabilization with seeding shall be used if perimeter controls and/or cover are not sufficient. Maintenance Requirements • Do not hose down or sweep soil or sediment accumulated on pavement or other impervious surfaces into constructed or natural site drainage feature (unless connected to a sediment basin, sediment trap, or similarly effective control), storm drain inlet, or receiving water. 5.6 Minimize Dust General The contactor shall be responsible to control dust throughout the construction period. Dust control methods shall include, but not be limited to sprinkling water on exposed areas, covering loaded dump trucks leaving the site, and temporary mulching. Dust control measures shall be utilized to limit the migration of dust from the site to abutting areas. Measures will be implemented to reduce surface and air movement of dust from exposed soil surfaces during land disturbance, demolition, and construction activities. These measures will decrease the amount of dust in the air, thus decreasing the potential for accidents, respiratory problems, and airborne sedimentation. To reduce the amount of areas requiring dust control, construction activities should be scheduled appropriately to minimize soil exposure. Dust control methods include sprinkling water on exposed areas. Water used shall be clean, non-polluted water obtained from sources approved by the Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-5 Owner and/or Engineer. In addition, streets will be swept regularly throughout construction. Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05(5)(e) to maintain surface waters free from pollutants the use of calcium chloride for dust control shall be avoided. Specific Dust Controls Description • Prevent dust from becoming a nuisance or hazard. During construction, excavated material and open or stripped areas are to be policed and controlled to limit spreading of the material. • Dust control measures shall be utilized to limit the migration of dust from the site to abutting areas. • Ensure that the existing equipment, facilities, and occupied space adjacent to or nearby areas of the work do not come in contact with dust or debris as a result of concrete demolition, excavation or surface preparation for coatings. Installation • Dust control methods shall include, but not be limited to, sprinkling water on exposed areas, using calcium chloride, covering loaded dump trucks leaving the site, and temporary mulching. Maintenance Requirements • During the daily work, all paved road and driveway surfaces shall be scraped and broomed (i.e., mechanical street sweeper) free of excavated materials daily. Prior to sweeping or as needed during the workday the surfaces shall be hosed down or otherwise treated to eliminate active or potential dust conditions and the natural road or wearing surface shall be exposed. 5.7 Minimize the Disturbance of Steep Slopes General Final grades shall be stabilized with mulch or loam and seed to prevent erosion. Install temporary erosion control mats on all exposed cut/fill slopes with a slope 3:1 or greater to protect against rainfall and wind erosion and hold moisture content to enhance vegetation growth in seed. Erosion control mats shall be biodegradable after 12 to 24 months. Placement of rip rap or crushed stone may also be utilized as a temporary slope stabilization method on side slopes in select portions of the site prone to stormwater runoff from upgradient areas from the site. The proposed locations of erosion control mat installations are depicted on the Project Drawings 5.8 Topsoil General All areas not to be paved or otherwise treated shall receive a 4-inch-thick layer of loam and seed. Salvage existing loam and topsoil and stockpile this material for re-spreading Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-6 where originally removed. On backfilling, grading shall be returned to preconstruction contours and the stockpile of loam shall be spread over areas disturbed during construction activities. Specific Topsoil Controls Description • Topsoil/loam will be controlled by providing temporary and permanent grass cover. Installation • Temporary seed cover shall be provided to stabilize the site in areas where construction activity shall not occur for more than 21 calendar days by the 7th day after construction activity has ceased. Maintenance Requirements • Seeding shall be inspected periodically, and a minimum 95% of the soil surface should be covered by vegetation. If any evidence of erosion is apparent, repairs shall be made, and additional measures shall be used in the interim. • Hay or straw mulch shall be applied immediately after seeding. 5.9 Soil Compaction In areas where final vegetative stabilization will occur or where infiltration practices will be installed: • Restrict vehicle and equipment use at these locations to avoid soil co mpaction; and • Prior to seeding or planting areas of exposed soil that have been compacted, use techniques that rehabilitate and condition the soils to support vegetative growth, if necessary and feasible. 5.10 Storm Drain Inlets General Catch basin inlet controls shall be installed in the existing stormwater system. No new stormwater management infrastructure is proposed in this project. Storm Drain Inlet Controls Provide catch basin inlet protection in all catch basins within the vicinity of the earth disturbing activities to protect the stormwater management system from high sediment loads and high velocities while disturbance due to construction is occurring in the drainage area. Inlet protection measures are not required for storm drain inlets that are conveyed to a sediment basin, sediment trap, or similarly effective control measure. • Perform work in accordance with Eversource Best Management Practices. Description • Storm drain inlet controls include the installation of silt sacks or approved equivalent. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-7 Installation • Temporary inlet protection devices shall be installed securely below catch basin rims in accordance with manufacturer’s recommendations. Maintenance Requirements • Silt sacks shall be inspected immediately after each rainfall and at least daily during prolonged rainfall. They shall be repaired or replaced as needed. • Sediment deposits should be removed after each storm event. They must be cleaned when deposits reach approximately 1/3 the height of the barrier. • The site contractor/project manager shall remove the deposited sediment and make any repairs by the end of the same work day in which the sediment is observed or by the end of the next work day if observation occurs on a non-work day. • Following stabilization of the site and the receipt of permission from the Owner’s Representative, the Contractor shall remove inlet protection. 5.11 Construction Stormwater Conveyance Channels General The Contractor shall control the grading in areas under construction so that the surface of the ground will properly slope to prevent accumulation of water in excavated areas and adjacent properties. Grass lined channels, riprap lined channels, and vegetated swales are all natural or constructed waterways or outlets utilized to convey stormwater away from the work area to a stable location, while at the same time, reducing the velocity and turbidity of the flow. Use in all areas where concentrated run-off would otherwise cause erosion/flooding. Specific Stormwater Conveyance Channel Measures Description • Temporary diversion swales and berms will be excavated where necessary prior to the start of major earthmoving operations to ensure minimal erosion and to keep areas as free from surface water. Refer to the Project Drawings. Installation • The swales will be used to channel water from disturbed areas to temporary sediment traps. Swale slopes will be stabilized with seed within seven days of installation. If the swale slopes are greater than 3:1 they will be stabilized with crushed stone, jute netting or turf reinforcement mats. The proposed locations of temporary diversions swales and berms are depicted in the Contract Documents. Maintenance Requirements • Stormwater conveyance channels shall be inspected on a regular basis. • Maintenance shall be completed to ensure that stormwater routed to conveyance channels does not circumvent the limits of the channels, and that the velocity of the stormwater is reduced. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-8 • Additional erosion control measures may be installed within the conveyance channel as necessary. 5.12 Chemical Treatment Treatment chemicals will not be utilized at the site. 5.13 Dewatering Practices General During excavation activities it may be necessary to dewater in the instance that high groundwater or saturated soil is present. Standard dewatering measures will be employed. No untreated groundwater will be discharged to wetlands or waterways. Excess water will be discharged overland in upland areas and allowed to naturally infiltrate after passing through filtration sacks or similar treatment alternatives. To the extent possible, dewatering activities should be located outside of the 100-foot Buffer Zone to resource areas. If dewatering occurs within the 100-foot Buffer Zone, activities should be monitored. Dewatering activities should be confined within an area of secondary containment. Specific Dewatering Practices Dewatering Practice Description • Shall be performed as per CGP requirements and Eversource Best Management Practices. • Provide, operate, and maintain adequate pumping, diversion, and drainage facilities in accordance with the approved dewatering plan to maintain the excavated area sufficiently dry from groundwater and/or surface runoff so as not to adversely affect construction procedures nor cause excessive disturbance of underlying natural ground. Locate dewatering system components so that they do not interfere with construction under this or other contracts. • Install erosion/sedimentation controls for velocity dissipation at point discharges onto non-paved surfaces. Installation • Install sand and gravel, or crushed stone, filters in conjunction with sumps, well points, and/or deep wells to prevent the migration of fines from the existing soil during the dewatering operation. • Transport pumped or drained water without interference to other work, damage to pavement, other surfaces, or property. Pump water through a silt filter bag prior to discharge to grade of drainage system. • Do not discharge water into any sanitary sewer system. • Provide separately controllable pumping lines. Maintenance Requirements • Repair any damage resulting from the failure of the dewatering operations and any damage resulting from the failure to maintain all the areas of work in a suitable dry condition. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-9 • Take actions necessary to ensure that dewatering discharges comply with permits applicable to the Project. Dispose of water from the trenches and excavations in such a manner as to avoid public nuisance, injury to public health or the environment, damage to public or private property, or damage to the work completed or in progress. 5.14 Site Stabilization Total Amount of Land Disturbance Occurring at Any One Time Five acres or less Greater than five acres General Complete the stabilization activities as specified in CGP Parts 2.2.14.a and/or 2.2.14.b. Initiate the installation of stabilization measures immediately in any areas of exposed soil where construction activities have permanently ceased or will be temporarily inactive for 14 or more calendar days. Complete the installation of stabilization measures as soon as practicable, but no later than 14 calendar days after stabilization has been initiated. Only use the following stabilization practices if you are not located in an arid, semi-arid, or drought-stricken area. 5.14.1 Seeding Vegetative Non-Vegetative Temporary Permanent Installation • When construction has temporarily or permenantly ceased, seeding shall occur immediately. Permanent seeding shall occur on any non-jurisdictional, graded or cleared upland area which has been completed as designed or will not be brought to final grade for 12 months or more. Maintenance Requirements • Periodic inspections shall occur once a week and after every rainstorm 0.25 inches or greater until a minimum of 70% of the soil surface is covered by vegetation. Refer to Eversource Best Management Practices and the approved seed submittal. 5.14.2 Mulching Vegetative Non-Vegetative Temporary Permanent Installation • When construction will be temporarily or permenantly ceased, mulching shall occur immediately over seeding, as required, for erosion control while vegetation is being established. Section 5 Erosion and Sediment Controls Stormwater Pollution Prevention Plan 5-10 Maintenance Requirements • Periodic inspections shall occur once a week and after every rainstorm 0.25 inches or greater. Refer to Eversource Best Management Practices and the approved mulch submittal. 5.14.3 Erosion Control Mats or Blankets Vegetative Non-Vegetative Temporary Permanent Description of Practice • Organic or synthetic materials applied to the soil surface as a continuous sheet. Used to protect disturbed areas from erosion and to enhance seed growth, typically where moving water is likely to wash out new vegetative plantings and mulches are ineffective. • Commonly used techniques include erosion control blankets which are made of mulch material surrounded by a plastic netting, jute mats which are sheets of woven jute fiber, and turf reinforcement matting which is usually a geotextile matrix most effective for channels. Maintenance Requirements • Periodic inspections shall occur once a week and after every rainstorm 0.25 inches or greater. Refer to Eversource Best Management Practices and the approved mat or blanket submittal. 5.14.4 Surface Roughening Vegetative Non-Vegetative Temporary Permanent Description of Practice • Roughening a bare soil surface either with horizontal grooves running across the slope, stair stepping, or tracking with construction equipment. An inexpensive and simple temporary control measure that encourages water infiltration, speeds the establishment of vegetation, and decreases runoff velocity. Stormwater Pollution Prevention Plan 6-1 Section 6 Pollution Prevention Standards 6.1 Potential Sources of Pollution TABLE 6-1 Construction Site Pollutants Pollutant-Generating Activity Pollutants or Pollutant Constituents (That could be discharged if exposed to stormwater) Location on Site (Or reference SWPPP Project Drawings where this is shown) Site work Soil particles and fines Where disturbance is proposed Paving and construction areas Petroleum, concrete, vehicle fluids, paints, solvents Where paving and construction is proposed Concrete construction Concrete Where concrete is proposed Pavement marking Paint Where pavement markings are proposed Solid waste storage Construction debris, trash In dumpster locations Fertilizing Fertilizers In areas of proposed seeding Equipment use Hydraulic oils/fluids Where equipment and materials are stored or used Equipment use Antifreeze/coolant Where equipment and materials are stored or used Portable toilets Sewage Where portable toilets are located Staging areas Sediment, gasoline, fuel oil, concrete, vehicle fluids, paints, solvents, fertilizers, adhesives, antifreeze/coolant, hydraulic oil/fluid, etc. Where equipment and materials are staged 6.2 Spill Prevention and Response • Manufacturer’s recommended methods for cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. • Materials and equipment necessary for spil l cleanup will be kept in the material storage areas on-site. Equipment and materials will include but not be limited to brooms, dustpans, mops, rags, gloves, goggles, kitty litter, sand, sawdust and plastic or metal trash containers specifically for this purpose. • All spills will be cleaned up immediately after discovery. • The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with hazardous substances. Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-2 • Spills of toxic or hazardous material will be reported to the appropriate state or local government agency regardless of size. • The Spill Prevention Plan will be adjusted to include measures to prevent this type of spill from recurring and how to cleanup the spill if it recurs. A description of the spill, its cause, and the cleanup measures will be included. • The site superintendent responsible for day to day operations will be the Spill Response Coordinator (SRC). The SRC is responsible for decisive actions in the event of a spill at the facility. The SRC will supervise efforts to provide immediate containment of the spill to prevent a more difficult cleanup situation. Cleanup crews will utilize proper spill cleanup materials and employ safe work practices. 6.2.1 Federal and State Spill Notification In accordance with the Massachusetts Department of Environmental Protection (MassDEP) Massachusetts Contingency Plan (MCP) section 310 CMR 40.0310, the SRC shall notify the MassDEP (Southeast Region) - (508) 946-2700, for releases which require notification under the MCP which include two-hour notification, 72-hour notification, and 120-day notification. In accordance the MCP 310.0311, two hour notifications are required if an accident or other type of incident result in a release to which include but are not limited to: • Land o 10 gallons or more of oils (PCB < 500 ppm) o 1 gallon or more of oils (PCB ≥ 500 ppm) • Waterways o Any quantity of oils • Or triggers the exposure to toxic chemical levels as listed in 301 CMR 40.1600, Revised Massachusetts Contingency Plan The SRC shall notify the National Response Center (NRC) at (800) 424-8802 where a leak, spill, or other release containing a hazardous substance or oil in an amount equal to or in excess of a reportable quantity consistent with Part 2.3.6 and established under either 40 CFR Part 110, 40 CFR Part 117, or 40 CFR Part 302, occurs during a 24-hour period. In either event, the SRC will work with state and federal agencies to ensure that all appropriate forms and reports are submitted in a timely manner. • Note: Trigger volumes for other chemical spills vary. Contact the MassDEP or a Licensed Site Professional (LSP) for specific guidance on reporting thresholds and requirements for other chemicals. MassDEP, Bureau of Waste Site Cleanup MassDEP Reportable Condition Notification MA Department of Transportation (617) 292-5500 (888) 304-1133 (877) 623-6846 6.2.2 Local Notification The following local agencies will be called to provide emergency assistance at the facility on the judgment of the SRC: Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-3 TABLE 6-2 Emergency Assistance Notification Fire Department: 911 or (508) 398-2212 Police Department: 911 or (508) 775-0445 Hospital: Cape Cod Hospital 27 Park Street, Hyannis, MA 02601 (508) 771-1800 Department of Public Works: (508) 398-2231 6.3 Fueling and Maintenance of Equipment or Vehicles General Efforts shall be made to perform equipment/vehi cle fueling and maintenance off-site. If fueling and/or maintenance of equipment of vehicles is performed on-site, the following pollution prevention practices must be provided. Specific Pollution Prevention Practices • Site contractor/project manager shall provide an on-site vehicle fueling and maintenance area that is clean and dry. • If possible, keep area covered. • Keep a spill kit at the fueling and maintenance area. • Ensure adequate supplies are available at all times to handle spills, leaks, and disposal of used liquids. • Vehicles shall be inspected regularly for leaks and damage. • Use drip pans, drip cloths or absorbent pads when replacing spent fluid and around leaky vehicles. • Clean up spills or contaminated surfaces immediately, using dry clean-up measures (do not clean contaminated surfaces by hosing the area down), and eliminate the source of the spill to prevent a discharge or a continuation of an ongoing discharge. 6.4 Washing of Equipment and Vehicles General Efforts shall be made to perform equipment/vehicle washing and maintenance off-site. If washing of equipment and vehicles is per formed on-site, the following pollution prevention practices must be provided to minimize the discharge of pollutants. Specific Pollution Prevention Practices • Site contractor/project manager shall provide a proper washing area. • Discharges from washing areas shall be infiltrated or diverted into sanitary sewer system unless no soaps or detergents are used. Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-4 • If soaps, detergents, or solvents are stored on-site, cover must be provided to prevent these detergents from coming into contact with rainwater and/or with stormwater. 6.5 Storage, Handling, and Disposal of Construction Products, Materials, and Wastes 6.5.1 Building Products • Site contractor/project manager shall designate a waste collection area on the site that does not receive a substantial amount of runoff from upland areas and does not drain directly to a water body. • Ensure that containers have lids so they can be covered before periods of rain and keep containers in a covered area whenev er possible. • Schedule waste collection to prevent the containers from overfilling. • Clean up spills immediately. For hazardous materials, follow cleanup instructions on the package. Use an absorbent material such as sawdust or cat litter to contain the spill. • During the demolition phase of construction, provide extra containers and schedule more frequent pickups. • Collect, remove, and dispose of all construction site wastes at authorized disposal areas. 6.5.2 Pesticides, Herbicides, Insecticides, Fertilizers, and Landscaping Materials • Store new and used materials in a neat, orderly manner in their appropriate containers in a covered area. If storage in a covered area is not possible, the materials shall be covered with polyethylene or polypropylene sheeting to protect them from the elements. • Storage area should include precautions to contain any potential spills. • Immediately contain and clean up any spills wit h absorbent materials. • Comply with all application and disposal requirements included on the registered pesticide, herbicide, insecticide, and fertilizer label. No storage, handling, and disposal of these products will occur on-site during construction. Fertilizers and landscaping materials will be used as part of site stabilization at the conclusion of construction. 6.5.3 Diesel Fuel, Oil, Hydraulic Fluids, Other Petroleum Products, and Other Chemicals If any chemical container has a storage capacity of less than 55 gallons: • The container(s) must be water-tight and be kept closed, sealed, and secured when not being actively used. • Provide either cover (e.g., temporary roofs) to minimize the exposure of these containers to precipitation and to stormwater, or provide secondary containment Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-5 (e.g., curbing, spill berms, dikes, spill containment pallets, double-wall, above- ground storage tank). • Storage area should include precautions to contain any potential spills. • Immediately contain and clean up any spills with absorbent material. • Have equipment available in fuel storage areas and in vehicles to contain and clean up any spills that occur. If any chemical container has a storage capacity of 55 gallons or more: • The container(s) must be water-tight and be kept closed, sealed, and secured when not being actively used. • Store container(s) a minimum of 50 feet from receiving waters, constructed or natural site drainage features, and storm drain inlets. o If infeasible due to site constraints, document the specific reasons why the 50-foot setback is not feasible. o Chemical containers having a storage capacity of 55 gallons or more will be stored in water-tight portable storage units on-site which will be kept closed, sealed and secured when not in use. • Provide either cover (e.g., temporary roofs) to minimize the exposure of these containers to precipitation and to stormwater, or provide secondary containment (e.g., curbing, spill berms, dikes, spill containment pallets, double-wall, above- ground storage tank). • Have a spill kit available on-site that is in good working condition (e.g., not damaged, expired, or used up) and ensure personnel are available to respond immediately in the event of a lea or spill. o Additional secondary containment measures are listed at 40 CFR § 112.7(c)(1). • Immediately contain and clean up any spills with absorbent material. 6.5.4 Hazardous or Toxic Waste Examples include paints, caulks, sealants, fluorescent light ballasts, solvents, petroleum- based products, wood preservatives, additives, curing compounds, and acids. • Store new and used materials in a neat, orderly manner in their appropriate containers in a covered area. If storage in a covered area is not possible, the materials shall be covered with polyethyl ene or polypropylene sheeting to protect them from the elements. • Separate hazardous or toxic waste from construction and domestic waste. • Storage areas should include precautions to contain any potential spills. • Immediately contain and clean up any spills with absorbent materials. • Have equipment available in fuel storage areas and in vehicles to contain and clean up any spills that occur. • To prevent leaks, empty and clean hazardous waste containers before disposing of them. Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-6 • Never remove the original product lab el from the container because it contains important safety information. Follow the manufacturer's recommended method of disposal, which should be printed on the label. • Never mix excess products when disposing of them, unless specifically recommended by the manufacturer. 6.5.5 Construction and Domestic Waste Examples include packaging materials, scrap construction materials, masonry products, timber, pipe and electrical cuttings, plastics, Styrofoam, concrete, demolition debris, and other trash or discarded materials. • All materials shall be collected and stored in securely lidded receptacles, no construction waste materials will be buried. Clean up immediately if containers overflow and if there is litter elsewhere on the site from escaped trash. 6.5.6 Sanitary Waste • Portable sanitary units will be provided throughout the course of the project for use by the site contractor/project manager’s employees. A licensed sanitary waste management contractor will regularly collect all sanitary waste from the portable units. Position portable toilets so that they are secure and will not be tipped or knocked over. • To the extent feasible, situate portable sanitary units away from receiving waters, storm drain inlets, and constructed or natural site drainage features. 6.6 Washing of Applicators and Containers used for Paint, Concrete, or Other Materials • The contractors should be encouraged, where possible, to use washout facilities at their own plant or dispatch facility from stucco, paint, concrete, form release oils, curing compounds, and other construction materials. • If washout of these materials is completed on-site: o Direct all wash water into a leak-proof container or leak-proof pit. The container or pit must be designed so that no overflows can occur due to inadequate sizing or precipitation. o Handle washout or cleanout wastes as follows: ▪ Do not dump liquid wastes in storm sewers, through infiltration devices, or on the ground. ▪ Dispose of liquid wastes in accordance with applicable requirements in CGP Part 2.3.4.b.i. ▪ Remove and dispose of hardened concrete waste consistent with the handling of other construction wastes in Section 6.5. o Attempts should be made to locate washout areas as far away as possible from receiving waters and stormwater inlets or conveyances, and to the extent practicable, designate areas to be used for these activities and conduct such activities only in these areas. Section 6 Pollution Prevention Standards Stormwater Pollution Prevention Plan 6-7 • Inspect washout facilities daily to detect leaks or tears and to identify when materials need to be removed. Stormwater Pollution Prevention Plan 7-1 Section 7 Inspection and Corrective Action 7.1 Delegation of Authority If a Stormwater Team member identified in Section 2.2 will not be performing the responsibilities shown, the Stormwater Team member shall identify a “qualified person” and their responsibilities with the Delegation of Authority form included in Appendix J. The CGP describes a “qualified person” as someone who: • Is knowledgeable in the principles and practice of erosion and sediment controls and pollution prevention; • Possesses the appropriate skills and training to assess conditions at the construction site that could impact stormwater quality; and • Has appropriate skills and training to assess the effectiveness of any stormwater controls selected and installed to meet the requirements of this permit. 7.2 Inspection Personnel and Procedures Personnel Responsible for Inspections The Team Member or delegated person identified in Section 2.2 or Appendix J, respectively, shall complete inspection reports, sign inspection reports, and maintain current copies of all inspection reports on-site or at an easily accessible location. Inspection Frequency Inspections shall be conducted according to the following schedules: • Once every 7 calendar days, or • Once every 14 calendar days and within 24 hours of either: o A storm event that produces 0.25 inches or more of rain within a 24-hour period (including when there are multiple, smaller storms that alone produce less than 0.25 inches but together produce 0.25 inches or more in 24 hours), or o A storm event that produces 0.25 inches or more of rain within a 24-hour period on the first day of a storm and continues to produce 0.25 inches or more of rain on subsequent days (an inspection is conducted within 24 hours of the first day of the storm and within 24 hours after the last day of the storm that produces 0.25 inches or more of rain (i.e., only two inspections would be required for such a storm event)), or o A discharge caused by snowmelt from a storm event that produces 3.25 inches or more of snow within a 24-hour period. If there is a storm event that continues for multiple days, and each day of the storm produces 0.25 inches or more of rain, an inspection must be conducted within 24 hours of the first day of the storm and within 24 hours after the end of the storm. For storm events occurring on a Friday or a non-workday, inspections must be conducted on the next workday. Section 7 Inspection and Corrective Action Stormwater Pollution Prevention Plan 7-2 Rain event information shall be based on a properly maintained rain gauge on your site, or obtained from a weather station that is representative of the site location (address of the weather station must be recorded in the SWPPP). The rainfall amount that triggered the inspection shall be recorded on the inspection form. Reduced Frequency Stabilized Areas o Twice during the first month, no more than 14 calendar days apart; then once per month after the first month until permit coverage is terminated consistent with Part 9 in any area of your site where the stabilization steps in Part 2.2.14.a have been completed. Stabilized Areas (“linear construction sites,” as defined in Appendix A) o The frequency of inspections may be reduced to twice per month for the first month, no more than 14 calendar days apart, in any area of your site where the stabilization steps in 2.2.14a have been completed. o After the first month, inspect once more within 24 hours of the occurrence of a storm event of 0.25 inches or greater or within 24 hours of a snowmelt discharge from a storm event that produces 3.25 inches or more of snow within a 24-hour period. o If there are no issues or evidence of stabilization problems, you may suspend further inspections. o If “wash-out” of stabilization materials and/or sediment is observed, following re-stabilization, inspections must resume at the inspect ion frequency required in Part 4.4.1a. Inspections must continue until final stabilization is visually confirmed following a storm event of 0.25 inches or greater. Frozen Conditions o If construction activities are suspended due to frozen conditions, inspections may be temporarily suspended until thawing conditions. See CGP Part 4.4.3 for conditions and requirements. Inspection Requirements • Check rain gauge for rain amount (if applicable). • Check whether all stormwater controls are properly installed, appear to be operational, and are working as intended to minimize pollutant discharges. • Check for the presence of conditions that could lead to spills, leaks or other accumulation of pollutants on the site. • Identify any locations where new or modified stormwater controls are necessary to meet the requirements of Parts 2 and/or 3. • Check for signs of visible erosion and sedimentation (e.g., sediment deposits) that have occurred and are attributable to your discharge at points of discharge and, if applicable, the banks of any waters of the U.S. flowing within or immediately adjacent to the site. • Identify any incidents of noncompliance observed. • If a discharge is occurring during your inspection: Section 7 Inspection and Corrective Action Stormwater Pollution Prevention Plan 7-3 o Identify all discharge points at the site; and o Observe and document the visual quality of the discharge and take note of the characteristics of the stormwater discharge, including color; odor; floating, settled, or suspended solids; foam; oil sheen; and other indicators of stormwater pollutants. • Based on the results of the inspection, complete any necessary maintenance or necessary steps to replace, repair, maintain or modify according to the corrective action schedule found under Section 7.3. Dewatering Inspection Requirements • The inspection date; • Names and titles of personnel making the inspection. • Approximate times that the dewatering discharge began and ended on the day of inspection (If the dewatering discharge is a continuous discharge that continues after normal business hours, indicate that the discharge is continuous). • Estimates of the rate (in gallons per day) of discharge on the day of inspection. • Whether or not any of the following indications of pollutant discharge were observed at the point of discharge to any receiving waters flowing through or immediately adjacent to the site and/or to constructed or natural site drainage features or storm drain inlets (if the operator observes any of these indicators of pollutant discharge, corrective action is required consistent with Parts 5.1.5b and 5.2.2.): o A sediment plume, suspended solids, unusual color, presence of odor, decreased clarity, or presence of foam; and/or o A visible sheen on the water surface or visible oily deposits on the bottom or shoreline of the receiving water. • Photographs of: o The dewatering water prior to treatment by a dewatering control(s) and the final discharge after treatment; o The dewatering control(s); and o The point of discharge to any receiving waters flowing through or immediately adjacent to the site and/or to constructed or natural site drainage features, storm drain inlets, and other conveyances to receiving waters. • Based on the results of the inspection, complete any necessary maintenance or necessary steps to replace, repair, maintain or modify according to the corrective action schedule found under Section 7.3. Inspection Report Forms Inspection forms are located in Appendix D. The Inspector is to copy blank forms, fill out, and place in Appendix D of this report within 24 hours of the inspection. Copies of the inspection reports will be provided to the Owner and Engineer weekly. Section 7 Inspection and Corrective Action Stormwater Pollution Prevention Plan 7-4 7.3 Corrective Action Routine Maintenance vs. Corrective Action Inspections During inspections, operator may observe conditions requiring follow- up action in the form of routine maintenance or corrective action. Routine Maintenance Triggered by the need for minor repairs or other upkeep performed to ensure site’s controls remain in effective operating condition. Minor repairs are those that generally can be completed by the close of the next business day. Corrective Action Triggered by the need for a significant repai r or a new or replacement control, or by the occurrence of specific conditions. Triggered by the repeated need to repair a control (3+) which is not performing as intended. Personnel Responsible for Corrective Actions The Team Member or delegated person identified in Section 2.2 or Appendix J, respectively, shall be responsible for completing Corrective Actions, completing Corrective Action Reports as outline in the CGP and below, and maintaining current copies of all inspection reports on-site or at an easily accessible location. A Correction Action is an action taken to: • Repair, modify, or replace any stormwater controls used at the site. • Clean up and proper disposal of spills, releases, or other deposits. • Remedy a permit violation. Corrective Action Requirements When a problem with the erosion or sediment controls is encountered, necessary repairs or modifications must be completed within one workday upon discovery of erosion and sediment controls needing to be replaced or repaired. Should significant repairs or additional controls be required, new or modified controls must be in place within seven (7) days. Where a corrective action results in changes to any of the stormwater controls or procedures it must be documented in the SWPPP within seven (7) days of completing the corrective action. If it is determined that the stormwater controls as installed and maintained are not effective enough for the discharge, the EPA regional office must be notified by the end of the next calendar day. Notification shall also be through the EPA’s electronic NOI system. Corrective Action Report For each corrective action taken, a Corrective Action Report, located in Appendix E, must be completed. Within 24 hours of discovering the occurrence of condition requiring corrective action, a report must be completed that includes: • Which condition was identified at the site. Section 7 Inspection and Corrective Action Stormwater Pollution Prevention Plan 7-5 • The nature of the conditions identified. • The date and time of the condition identified and how it was identified. Within seven days of discovering the occurrence of condition requiring corrective action, a report must be completed that includes: • Any follow-up actions taken to review the design, installation, and maintenance of stormwater controls, including the dates of such actions occurred. • A summary of stormwater control modifications taken or to be taken, including a schedule of activities necessary to implement changes, and the date the modifications are completed or expected to be completed. • Notice of whether SWPPP modifications are required as a result of the condition identified or corrective action. Copies of the Corrective Action Reports will be provided to the Owner and Engineer weekly. 7.4 SWPPP Modifications SWPPP modifications are required pursuant to CGP Part 7.4.1 in the following circumstances: • Whenever new operators become active in construction activities on your site, or you make changes to your construction plans, stormwater control measures, pollution prevention measures, or other activities at your site that are no longer accurately reflected in your SWPPP. • To reflect areas on the Project Drawings where operational control has been transferred (and the date of transfer) since initiating permit coverage. • If inspections or investigations determine that SWPPP modifications are necessary for compliance with this permit. • Where EPA determines it is necessary to impose additional requirements on your discharge. • To reflect any revisions to applicable federal, state, tribal, or local requirements that affect the stormwater control measures implemented at the site. SWPPP changes shall be recorded on the SWPPP Amendment Log in Appendix F within 7 days following the occurrence of any of the above circumstances. Stormwater Pollution Prevention Plan 8-1 Section 8 Turbidity Benchmark Monitoring for Dewatering Discharges For sites discharging dewatering water to “sensitive waters” (i.e., receiving waters listed as impaired for sediment or a sediment-related parameter (as defined in Appendix A of the CGP), or receiving waters designated as a Tier 2, Tier 2.5, or Tier 3 for antidegradation purposes), turbidity benchmark monitoring is required under Part 3.3 of the CGP. • Sampling of dewatering discharge will be collected from dewatering discharge locations. • Samples will be collected at the beginning of and during dewatering activities to ensure that dewatering discharge is in compliance with Part 3.3 and Part 7.2.8 of the 2022 CGP. • Sample collection will follow Standard Operating Procedures for collection of stormwater and turbidity samples. • Sampling locations will be depicted on a site plan to be submitted with SWPPP inspection forms and quarterly benchmark monitoring submittals to EPA. No dewatering discharges to sensitive waters are proposed. 8.1 Turbidity Benchmark The benchmark threshold for turbidity under the CGP is 50 NTUs, unless EPA has authorized the use of an alternate benchmark in accordance with Part 3.3.2.b. At any time prior to or during coverage under this permit, you may request that EPA approve a benchmark for your site that is higher than 50 NTUs based on information demonstrating that the higher number is the same as the receiving waters’ water quality standard for turbidity. Comparison of turbidity samples to benchmark • Compare the weekly average of turbidity monitoring results to the standard 50 NTU benchmark, or alternate benchmark if approved by EPA. o If the weekly average exceeds the benchmark, conduct follow-up corrective action (in accordance with Part 5.2.2) and document any correction action taken in your Corrective Action Log. • For averaging purposes, a “monitoring week” typically starts with a Monday and ends on Sunday. Once a new monitoring week starts, a new average for that week will be calculated from the monitoring results. • Although not required, if more than one sample is collected from the dewatering discharge, these results will be included in the calculation of the weekly average. • For more than one dewatering discharge point, a weekly average turbidity value will be calculated for each discharge point. Section 8 Inspection and Corrective Action Stormwater Pollution Prevention Plan 8-2 8.2 Reporting and Recordkeeping Weekly turbidity sampling reports must be sent to EPA within 30 days following the end of each monitoring quarter (refer to Table 8-1 below). If there are monitoring weeks in which there was no dewatering discharge, or if there is a monitoring quarter with no dewatering discharge, this information will be indicated in the monitoring report. In addition, if another Operator associated with the site is conducting turbidity monitoring, that will be included in the monitoring report. TABLE 8-1 Monitoring Quarters and Deadlines for Reporting Turbidity Benchmark Monitoring Data Monitoring Quarter # Months Reporting Deadline (Within 30 days after end of the quarter) 1 January 1 – March 31 April 30 2 April 1 – June 30 July 30 3 July 1 – September 30 October 30 4 October 1 – December 31 January 30 Quarterly turbidity monitoring data will be submitted via EPA’s NPDES eReporting Tool (NeT) unless a waiver has been received from the applicable EPA Regional Office. Monitoring information will be recorded for each day in which monitoring is required. This information will be retained for a period of at least three years from the expiration date of the CGP (February 16, 2027) or from the date authorization is terminated. 9-1 Section 9 Training The following personnel, at a minimum, must receive training: • Personnel who are responsible for the design, installation, maintenance, and/or repair of stormwater controls (including pollution prevention measures). • Personnel responsible for the application and storage of treatment chemicals. • Personnel who are responsible for conducting stormwater inspections. • Personnel who are responsible for taking corrective actions as required. At a minimum the required personnel must be trained to understand the following if related to the scope of their job duties: • The location of all stormwater controls on the site required by this permit, and how they are to be maintained. • The proper procedures to follow with respect to the permit’s pollution prevention requirements. • When and how to conduct inspections, record applicable findings, and take corrective actions. Those trained should be listed out individually in the table below and training shall be documented using a Training Log form found in Appendix I. A copy of the completed Training Logs shall be kept in Appendix I. TABLE 9-1 Documentation for Completion of Training Name Date Training Completed Section 10 Certification and Notification I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complet e. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Name James Clancy Title Associate Environmental Specialist Signature Date Name Amanda Houle Title Project Manager Signature Date 1/16/2023 Note: this certification must be re-signed in the event of SWPPP Modification. 10.1 Notice of Intent (NOI) After completion of the SWPPP and the above certification, the NOI must be submitted by all site Operators, listed above, at least 14 calendar days prior to commencing earth- disturbing activities. Use EPA’s NPDES eReporting Tool (NeT) to electronically prepare and submit the NOI for coverage under the 2022 CGP, unless a waiver was received from the applicable EPA Regional Office. To access NeT, go to https://cdx.epa.gov/cdx. The project is considered covered under the permit 14 calendar days after EPA has acknowledged receipt of the project NOI on the Agency’s website (https://e- enterprise.gov/eenterprise-new), unless EPA notifies the Operator that the authorization has been delayed or denied. Copies of the NOI(s) and the EPA Authorization Email shall be included in Appendix C. 1/18/2023 10.2 Notice of Termination (NOT) Until coverage is terminated under this permit, the Operators are required to continue to comply with all conditions and requirements in the permit. To terminate permit coverage, all Operators must submit to EPA a complete and accurate NOT, which certifies an Operator has met the requirements for termination as listed in Part 8 of the CGP. Use EPA’s NPDES eReporting Tool (NeT) to electronically prepare and submit the NOT for the 2022 CGP. To access NeT, go to https://cdx.epa.gov/cdx. Operators must submit the NOT within 30 calendar days after any of the triggering conditions listed in Part 8.2 of the CGP. An Operator’s authorization to discharge under the CGP terminates at midnight of the calendar day that a complete NOT is processed and posted on EPA’s website. Section 11 Permit Conditions Applicable to Specific States, Indian Country Lands, or Territories The 2022 CGP includes provisions in Part 9 which provide additions to the applicable conditions of the CGP to reflect specific additional conditions required as part of the State or Tribal CWA Section 401 certification process, or the Coastal Zone Management Act (CZMA) certification process, or as otherwise established by the permitting authority. The specific additional revisions and requirements only apply to activities in those specific States. 11.1 Commonwealth of Massachusetts The following summarizes the CGP Part 9 information. An excerpt of the part is attached in Appendix P. The Operator shall review in detail the state specific requirements and adhere to the additional requirements identified in Part 9. a. All discharges covered by the Construction General Permit shall comply with the provisions pursuant to 314 CMR 3.00, 314 CMR 4.00, 314 CMR 9.00, including applicable construction stormwater standards and 310 CMR 10.00. b. Permittees are prohibited from discharging dewatering water under the CGP from sites that are designated as Superfund/CERCLA or RCRA, and must make accommodations to dispose of the dewatering discharges appropriate ly, such as coverage under the Remediation General Permit (RGP) or Dewatering and Remediation General Permit (DRGP). c. Applicants seeking coverage under the 2022 CGP that propose to carry out construction activities near Outstanding Resource Waters as identified in 314 CMR 4.06, shall submit to MassDEP for review the following items. See Part 9 for additional information. - A copy of the Stormwater Pollution Prevention Plan (SWPPP); - A copy of the EPA NOI; and - MassDEP’s Stormwater BMP Checklist. d. Applicants that propose to dewater under the 2022 CGP and plan to discharge to certain waters as described below, shall determine that any dewatering discharges are not contaminated by testing the proposed discharge as part of the application for WM15 authorization. The results shall be reported to MassDEP as part of the WM15 application. See Part 9 for testing parameter requirements. - Outstanding Resource Waters (314 CMR 4.06) - Public Water Supplies (314 CMR 4.06(1)(d)1) - Impaired waters - For dewatering discharges to all other waters, if any pollutants are known or believed present in the proposed dewatering discharge water, the applicant shall apply for coverage under the NPDES Remediation General Permit or Dewatering and Remediation General Permit (DRGP) for Massachusetts if required. e. Applicants that propose to dewater under the 2022 CGP and discharge to Outstanding Resource Waters as identified in 314 CMR 4.06, shall submit the SWPPP and associated documents to MassDEP to review. MassDEP shall complete review within 30 days of receipt. f. Permittees that have been authorized to dewater under the 2022 CGP and that discharge to Outstanding Resource Waters as identified in 314 CMR 4.06 shall carry out daily benchmark monitoring for turbidity for the duration of dewatering. Permittees shall compare the weekly average of the turbidity monitoring results with the established benchmark turbidity value of 25 NTU. See Part 9 for testing and reporting requirements. g. Permittees shall store materials outside the Base Flood Elevation when feasible to prevent displacing runoff and erosion h. Applicants who apply for coverage under the 2022 CGP shall follow guidelines on fertilizer application, including use of fertilizer containing no phosphorus, in accordance with 330 CMR 31.00 Plant Nutrient Application Requirements for Agricultural Land and Non-Agricultural Turf and Lawns. Further, fertilizer shall never be applied to a site when a rain event greater than 0.5 inches is forecast in the next 48 hours. i. During the high flow periods in spring (i.e., mont hs of April to June), increased inspection frequency shall be required to once per week for all sites. j. Implementing structural improvements, enhanced/resilient pollution prevention measures, and other mitigation measures can help to minimize impacts from stormwater discharges from major storm events such as hurricanes, storm surge, extreme/heavy precipitation, and flood events. - If such stormwater control measures are already in place due to existing requirements mandated by other state, local or federal agencies, the SWPPP shall include a brief description of the controls and a reference to the existing requirement(s). - If the site may be exposed to or has previously experienced such major storm events, additional stormwater control measures that may be considered, and implemented as necessary. See list of controls in part 9. k. If the project work anticipates to carry out dust control, the permittee shall limit their dust control methodology to using water only and specifically avoid using other techniques, such as solutions containing calcium chloride. l. If MassDEP requests a copy of the SWPPP for any construction site at any time, the permittee shall submit the SWPPP to MassDEP within 14 days of such a request. MassDEP may conduct an inspection of any site covered by this permit to ensure compliance with state law requirements, including state water quality standards. J:\E\E5034 Eversource L&P 2019\188 - Yarmouth ERP Staging Site\SWPPP\Yarmouth ERP_SWPPP_draft.doc APPENDIX A WILLOW STREET EVERSOURCEJEFFERSON AVEPROJECT LOCATIONDRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C000COVER SHEET EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Cover Sheet.dwg1/18/2023 4:57:50 PM YARMOUTH ERP484 WILLOW STREET, WEST YARMOUTH, MA 02673PROJECT LOCATIONFLOOD INSURANCE RATE MAPDEVELOPER / OWNER:EVERSOURCE ENERGY, INC.484 WILLOW STREET, WEST YARMOUTH, MA 02673DATE OF APPLICATION: 01/19/2023PROPERTY ZONING DISTRICT: B3 - BUSINESSGENERAL ON-SITE SOIL TYPES (PER NRCS) - CARVER LOAMY COARSESAND (GROUP A)APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023Sheet List TableSheet NumberSheet TitleC000Cover SheetC001General Notes & LegendsC002General Notes & LegendsC003Boundary Survey & Existing Conditions (2017)C004Boundary Survey & Existing Conditions (2017)C005Boundary Survey & Existing Conditions (2017)C006Boundary Survey & Existing Conditions (2017)C007Boundary Survey & Existing Conditions (2017)CD01Demolition Plan - Tree ClearingC101Site PlanC102Fire Truck Access PlanC103Fence PlanC201Grading PlanC210Basin Cross SectionsC401Landscape PlanC402Landscape DetailsC501Civil DetailsC502Civil DetailsC503Civil DetailsDemolition PlanRetaining Wall ProfileErosion & Sediment Control PlanUtility PlanC504Civil DetailsCD02C220C250C301E100Electrical Site PlanE101Electrical Photometrics PlanE500Electrical Details Plan DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C001GENERAL NOTES & LEGENDS EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\General Notes & Legends.dwg1/17/2023 2:42:08 PM GENERAL NOTES1.CONTRACTOR TO CONFIRM THE HORIZONTAL AND VERTICAL LOCATION OF ALL EXISTING UTILITIES ANDINFORM THE ENGINEER OF ANY POTENTIAL CONFLICTS WITH PROPOSED UTILITIES PRIOR TOCONSTRUCTION.2.CONTRACTOR SHALL BE RESPONSIBLE FOR SITE SAFETY AND ALL WAYS, MEANS AND METHODS OFCONSTRUCTION.3.CONTRACTOR SHALL COMPLY WITH ALL APPLICABLE FEDERAL, STATE AND LOCAL AGENCY CODES,STANDARDS AND SPECIFICATIONS.4.CONTRACTOR SHALL OBTAIN ALL NECESSARY SITE PERMITS AND LICENSES FROM THE APPLICABLEGOVERNING AUTHORITIES.5.ALL CONSTRUCTION MATERIALS AND WORKMANSHIP SHALL BE IN ACCORDANCE WITH THE LATEST STATEAND LOCAL GOVERNMENT CONSTRUCTION STANDARDS AND SPECIFICATIONS.6.UNLESS OTHERWISE NOTED ON THE PLANS, CONTRACTOR SHALL NOTIFY THE LOCAL ENGINEERING ORPUBLIC WORKS DEPARTMENT AND/OR OTHER PROJECT GOVERNING AUTHORITY(S) A MINIMUM OFFORTY-EIGHT (48) HOURS PRIOR TO COMMENCING CONSTRUCTION OPERATIONS AND TO SCHEDULE ANYREQUIRED SITE INSPECTIONS.7.CONTRACTOR SHALL SCHEDULE A UTILITY LOCATING SERVICE AND/OR NOTIFY ALL UTILITY COMPANIES(GAS, ELECTRIC, TELEPHONE, CABLE, ETC.) AND THE LOCAL MUNICIPALITY TO DETERMINE THE LOCATIONOF UNDERGROUND UTILITIES PRIOR TO THE COMMENCEMENT OF CONSTRUCTION IN ORDER TO AVOIDPOTENTIAL CONFLICTS. IT IS ULTIMATELY THE RESPONSIBILITY OF THE CONTRACTOR TO LOCATE ALLEXISTING UTILITIES WHETHER INDICATED ON THE PLANS OR NOT AND TO HAVE THESE UTILITIES STAKEDPRIOR TO CONSTRUCTION. ANY NECESSARY RELOCATIONS OR REMOVALS OF EXISTING UTILITY LINESSHALL BE PERFORMED BY THE CONTRACTOR AT NO ADDITIONAL COST TO THE OWNER.8.CONTRACTOR SHALL BE RESPONSIBLE FOR THE PROTECTION OF ALL PRIVATE AND PUBLIC UTILITIESEVEN THOUGH THEY MAY NOT BE SHOWN ON THE PLANS. ANY UTILITY THAT IS DAMAGED DURINGCONSTRUCTION SHALL BE REPAIRED OR REPLACED BY THE CONTRACTOR AT HIS EXPENSE AND TO THESATISFACTION OF THE UTILITY OWNER.9.ALL EASEMENTS FOR EXISTING UTILITIES, BOTH PUBLIC AND PRIVATE, AND UTILITIES WITHIN PUBLICRIGHTS-OF-WAY ARE SHOWN ON THE PLANS PREPARED BY THE SURVEYOR ACCORDING TO INFORMATIONAVAILABLE FROM PUBLIC RECORDS OR VISIBLE FIELD MARKINGS. THE CONTRACTOR SHALL BEULTIMATELY RESPONSIBLE FOR DETERMINING THE EXACT LOCATION IN THE FIELD OF THESE UTILITYLINES AND FOR THEIR PROTECTION FROM DAMAGE DUE TO CONSTRUCTION OPERATIONS. IF EXISTINGUTILITY LINES OF ANY NATURE ARE ENCOUNTERED WHICH CONFLICT IN LOCATION WITH THE PROPOSEDCONSTRUCTION, THE CONTRACTOR SHALL IMMEDIATELY NOTIFY THE ENGINEER SO THE CONFLICT MAYBE RESOLVED.10.ALL UTILITY CONNECTIONS TO EXISTING LINES SHALL BE CONSTRUCTED IN ACCORDANCE WITH THERULES AND REGULATIONS AND TO THE SATISFACTION OF THE APPLICABLE UTILITY OWNER(S).11.CONTRACTOR SHALL FIELD VERIFY ALL DIMENSIONS, COORDINATES AND ELEVATIONS PRIOR TO THECOMMENCEMENT OF CONSTRUCTION AND SHALL IMMEDIATELY NOTIFY THE ENGINEER OF ANYDISCREPANCIES SO THE CONFLICT MAY BE RESOLVED.12.ALL PROPERTY MARKERS AND SURVEY REFERENCE MARKERS SHALL BE CAREFULLY PRESERVEDDURING CONSTRUCTION UNTIL THEIR LOCATION HAS BEEN WITNESSED OR OTHERWISE TIED IN BY ANAUTHORIZED AGENT OR PROFESSIONALLY LICENSED SURVEYOR.13.THE SAFE AND ORDERLY PASSAGE OF TRAFFIC AND PEDESTRIANS SHALL BE PROVIDED WHERECONSTRUCTION OPERATIONS ABUT PUBLIC THROUGH-FARES AND ADJACENT PROPERTY.14.ALL AREAS DISTURBED BY THE GENERAL CONTRACTOR OR SUB-CONTRACTORS SHALL BE RETURNED TOTHE ORIGINAL CONDITION OR BETTER, EXCEPT WHERE PROPOSED CONSTRUCTION IS INDICATED ON THEPLANS.15.PRIOR TO INITIAL ACCEPTANCE BY THE OWNER(S) AND/OR GOVERNING AUTHORITY, ALL WORK SHALL BEINSPECTED AND APPROVED BY THE OWNER AND MUNICIPALITY ENGINEER OR HIS REPRESENTATIVE(S).THE CONTRACTOR SHALL GUARANTEE HIS WORK FOR A PERIOD OF 24 (TWENTY FOUR) MONTHS FROMTHE DATE OF SUBSTANTIAL COMPLETION AND SHALL BE HELD RESPONSIBLE FOR ANY DEFECTS INMATERIAL OR WORKMANSHIP OF THIS WORK DURING THAT PERIOD AND UNTIL FINAL ACCEPTANCE ISMADE.16.CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING SAFE AND ADEQUATE WORKING CONDITIONSTHROUGHOUT THE DURATION OF CONSTRUCTION OF THE PROPOSED IMPROVEMENTS.17.CONTRACTOR SHALL KEEP THE PUBLIC STREET PAVEMENTS CLEAN OF DIRT AND DEBRIS AND, WHENNECESSARY, CLEAN PAVEMENTS AT THE END OF EACH WORKING DAY.18.ALL CONSTRUCTION STAKING, SCHEDULING AND PAYMENT IS THE RESPONSIBILITY OF THE CONTRACTOR.19.AFTER COMPLETION OF THE PROPOSED IMPROVEMENTS AND WHEN REQUIRED BY THE GOVERNINGAUTHORITY(S), CONTRACTOR SHALL PROVIDE THE OWNER AND ENGINEER WITH AS-BUILT AND/ORRECORD DRAWINGS, SIGNED AND SEALED BY A PROFESSIONALLY LICENSED ENGINEER OR SURVEYORAND SHALL INCLUDE AT A MINIMUM (WHERE APPLICABLE TO THE SCOPE OF WORK) THE FOLLOWINGITEMS:19.1.TOPOGRAPHY AND SPOT GRADE ELEVATIONS OF ALL PROPOSED PERMANENT SITE FEATURESINCLUDING ANY STORM WATER FACILITIES OR MODIFICATIONS TO EXISTING STORM WATERFACILITIES.19.2.HORIZONTAL AND VERTICAL LOCATION AND ALIGNMENT OF ALL PROPOSED ROADWAYS, PARKINGLOTS, UTILITIES, BUILDINGS OR OTHER PERMANENT SITE FEATURES.19.3.RIM AND INVERT AND/OR TOP OF PIPE ELEVATIONS FOR ALL PROPOSED UTILITIES.19.4.AS-BUILT AND/OR RECORD DRAWING INFORMATION SHALL BE SHOWN ON THE APPROVEDENGINEERING PLANS ISSUED FOR CONSTRUCTION. ANY AND ALL DEVIATIONS FROM THESEAPPROVED PLANS SHALL BE SHOWN BY MEANS OF STRIKING THROUGH THE PROPOSEDINFORMATION AND CLEARLY INDICATING THE AS-BUILT LOCATIONS AND ELEVATIONS ON THEAPPLICABLE PLAN SHEET.20.CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFICATION OF ALL SITE SETBACKS, EASEMENTS ANDDIMENSIONS PRIOR TO COMMENCEMENT OF CONSTRUCTION.21.ALL HANDICAP ACCESSIBLE SITE IMPROVEMENTS SHALL BE CONSTRUCTED IN ACCORDANCE WITH ALLFEDERAL, STATE AND LOCAL CODES AND REQUIREMENTS.22.IF DURING THE COURSE OF CONSTRUCTION THE CONTRACTOR FINDS ANY DISCREPANCIES ORCONFLICTS BETWEEN THE PROPOSED SITE IMPROVEMENTS INDICATED ON THE PLANS AND THEPHYSICAL CONDITIONS OF THE SITE, OR ANY ERRORS OR OMISSIONS WITHIN THE PLANS OR IN THE SITELAYOUT AS PROVIDED BY THE ENGINEER, IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TOIMMEDIATELY NOTIFY THE ENGINEER. UNTIL AUTHORIZED TO PROCEED, ANY WORK PERFORMED BY THECONTRACTOR AFTER SUCH A DISCOVERY WILL BE AT THE CONTRACTOR'S SOLE RISK AND EXPENSE.23.CONTRACTOR SHALL COORDINATE ALL SITE IMPROVEMENTS WITH ARCHITECTURAL PLANS.ARCHITECTURAL PLANS SHALL BE USED FOR BUILDING STAKEOUT.24.CONTRACTOR SHALL COORDINATE ALL LANDSCAPE IMPROVEMENTS, INCLUDING NEW PLANTINGS ANDTURF AREA RESTORATION REQUIREMENTS, WITH LANDSCAPE PLANS.25.ALL DIMENSIONS SHOWN ARE MEASURED FROM BACK OF CURB TO BACK OF CURB OR EDGE OFPAVEMENT TO EDGE OF PAVEMENT UNLESS OTHERWISE NOTED.26.ALL CURB RADII ARE MEASURED AT THE FACE OF CURB UNLESS OTHERWISE NOTED.27.ALL NEW ASPHALT AND/OR CONCRETE PAVING SHALL MATCH EXISTING PAVEMENTS FLUSH.28.CONTRACTOR SHALL RESTORE ALL DISTURBED AREAS OUTSIDE OF CONSTRUCTION LIMITS TO ORIGINALCONDITION OR BETTER.29.CONTRACTOR SHALL REPAIR AT HIS EXPENSE ANY DAMAGE TO EXISTING ASPHALT, CONCRETE, CURBS,SIDEWALKS, ETC. RESULTING FROM CONSTRUCTION TRAFFIC AND/OR OPERATIONS. REPAIRS SHALL BEMADE TO THE SATISFACTION OF THE OWNER AND/OR ENGINEER.30.ALL FIRE ACCESS LANES WITHIN THE PROJECT AREA SHALL REMAIN IN SERVICE, CLEAN OF DEBRIS, ANDACCESSIBLE FOR USE BY EMERGENCY VEHICLES.31.ALL DETECTABLE WARNING PLATES SHALL BE PREFORMED PLASTIC INSERTS UNLESS OTHERWISENOTED.SITE GRADING & PAVING NOTES1.ALL SITE WORK, GRADING, AND PAVING OPERATIONS WITHIN THE LIMITS OF THE PROJECT SHALL BEPERFORMED IN ACCORDANCE WITH THE NOTES IN THE PLANS AND THE STANDARDS, SPECIFICATIONS,CODES AND ORDINANCES OF THE LOCAL GOVERNING AUTHORITIES. IN CASE OF CONFLICT, THE MORESTRINGENT CODE SHALL TAKE PRECEDENCE.2.EARTH EXCAVATION SHALL INCLUDE CLEARING, STRIPPING AND STOCKPILING TOPSOIL, REMOVINGUNSUITABLE MATERIALS, CONSTRUCTION OF EMBANKMENTS, NON-STRUCTURAL FILLS, FINAL SHAPINGAND TRIMMING TO THE LINES, GRADES AND CROSS SECTIONS SHOWN ON THE PLANS. ALL UNSUITABLEOR EXCESS MATERIAL SHALL BE DISPOSED OF LEGALLY OFFSITE OR AS DIRECTED BY THE PROJECTREPRESENTATIVE IN THE FIELD.3.EXCAVATED TOPSOIL SHALL BE STOCKPILED ON THE SITE IN AREAS DESIGNATED BY THE PROJECTENGINEER UNTIL SUCH TIME THAT THIS TOPSOIL CAN BE USED FOR FINAL GRADING. UNLESS OTHERWISENOTED ON THE PLANS, A MINIMUM OF 6" TOPSOIL RE-SPREAD AND SEEDING FOR ALL DISTURBED AREASIS REQUIRED.4.THE GEOTECHNICAL INVESTIGATION REPORT, BY LANGAN DATED 03/29/2022 AND PROJECT NUMBER140206001, FOR THE SITE AND ALL ADDENDA THERETO ARE SUPPORTING DOCUMENTS FOR THISPROJECT. THE RECOMMENDATIONS AS STATED IN SAID REPORT ARE HEREBY INCORPORATED INTOTHESE CONSTRUCTION NOTES BY REFERENCE AND SHALL BE FOLLOWED BY ALL CONTRACTORS. THEGRADING OPERATIONS ARE TO BE CLOSELY SUPERVISED AND INSPECTED, PARTICULARLY DURING THEREMOVAL OF UNSUITABLE MATERIAL AND THE CONSTRUCTION OF EMBANKMENTS OR BUILDING PADS, BYA SOILS ENGINEER OR HIS REPRESENTATIVE. FURTHER CONSTRUCTION OPERATIONS WILL NOT BEPERMITTED UNTIL THE SOILS ENGINEER ISSUES A WRITTEN STATEMENT THAT THE AREA IN QUESTIONHAS BEEN SATISFACTORILY PREPARED AND IS READY FOR CONSTRUCTION.5.ALL TESTING, INSPECTION AND SUPERVISION OF SOIL QUALITY, UNSUITABLE SOIL REMOVAL AND ITSREPLACEMENT AND OTHER SOILS RELATED OPERATIONS SHALL BE THE RESPONSIBILITY OF THECONTRACTOR AND SHALL BE COORDINATED WITH AND PERFORMED AT THE DIRECTION OF THE OWNER'SGEOTECHNICAL ENGINEER.6.THE CONTRACTOR SHALL USE CARE IN GRADING NEAR TREES, SHRUBS, AND BUSHES WHICH ARE NOTNOTED TO BE REMOVED SO AS NOT TO CAUSE INJURY TO ROOTS OR TRUNKS.7.THE CONTRACTOR SHALL USE CARE IN GRADING OR EXCAVATING NEAR ANY AND ALL EXISTING ITEMSWHICH ARE NOT INDICATED TO BE REMOVED. ANY DAMAGE DONE TO THESE EXISTING ITEMS BY THECONTRACTOR'S OPERATIONS SHALL BE REPAIRED AT HIS OWN EXPENSE.8.REMOVED PAVEMENTS, SIDEWALKS, CURBS, TREES AND STUMPS SHALL BE DISPOSED OF LEGALLYOFFSITE AT LOCATIONS DETERMINED BY THE CONTRACTOR.9.ON AND OFFSITE PAVING AND CURBS TO REMAIN SHALL BE PROTECTED FROM DAMAGE, AND, IFDAMAGED, SHALL BE REPLACED PROMPTLY TO MEET STATE AND LOCAL STANDARD SPECIFICATIONS INMATERIALS AND WORKMANSHIP.10.PROPOSED ELEVATIONS INDICATE FINISHED GRADE CONDITIONS. FOR ROUGH GRADING ELEVATIONSALLOW FOR THE THICKNESS OF THE PROPOSED PAVEMENT SECTION (ROADS, WALKS, DRIVE, ETC.) ORTOPSOIL AS INDICATED ON THE PLANS.11.CONTRACTOR SHALL PROVIDE SMOOTH VERTICAL CURVES THROUGH THE HIGH AND LOW POINTSINDICATED BY SPOT ELEVATIONS ON THE PLANS. CONTRACTOR SHALL PROVIDE UNIFORM SLOPESBETWEEN NEW AND EXISTING GRADES AND AVOID ANY RIDGES AND/OR DEPRESSIONS.12.ALL PROPOSED GRADING, PAVEMENT, APRONS, CURBS, WALKS, ETC. SHALL MATCH EXISTING GRADESFLUSH.13.ALL EXISTING AND PROPOSED TOP OF FRAME ELEVATIONS FOR STORM, SANITARY, WATER AND OTHERUTILITY STRUCTURES SHALL BE ADJUSTED TO MEET FINISHED GRADE WITHIN THE PROJECT LIMITS.14.REQUIRED RIM ADJUSTMENTS SHALL BE MADE WITH PRECAST CONCRETE ADJUSTING RINGS NOT TOEXCEED A MAXIMUM OF EIGHT (8) INCHES IN OVERALL HEIGHT. A MAXIMUM OF TWO (2) ADJUSTING RINGSARE ALLOWED. BUTYLROPE JOINT SEALANT SHALL BE USED ON ALL JOINTS BETWEEN THE PRECASTELEMENTS.15.SITE GRADING AND CONSTRUCTION OF THE PROPOSED SITE IMPROVEMENTS SHALL NOT CAUSEPONDING OF STORM WATER. ALL AREAS ADJACENT TO THESE IMPROVEMENTS SHALL BE GRADED TOALLOW POSITIVE DRAINAGE AND MATCH EXISTING GRADES FLUSH.16.CONTRACTOR SHALL ENSURE POSITIVE SITE DRAINAGE AT THE END OF EACH WORKING DAY DURINGCONSTRUCTION OPERATIONS. FAILURE TO PROVIDE ADEQUATE DRAINAGE WILL PRECLUDE THECONTRACTOR FROM ANY POSSIBLE COMPENSATION REQUESTED DUE TO DELAYS OR UNSUITABLEMATERIALS CREATED AS A RESULT.17.DRIVEWAYS SHALL BE CONSTRUCTED SO AS NOT TO IMPEDE THE SURFACE DRAINAGE SYSTEM.18.TRAFFIC CONTROL DEVICES SHALL BE IN CONFORMANCE WITH THE APPLICABLE STATE DEPARTMENT OFTRANSPORTATION STANDARDS AND SHALL BE INSTALLED AND PROVIDED WHENEVER CONSTRUCTIONFOR UTILITIES ARE WITHIN STREET AREAS. APPLICABLE ORDINANCES OF THE MUNICIPALITY, COUNTY ORSTATE SHALL ALSO GOVERN THE TRAFFIC CONTROL REQUIREMENTS.19.ALL GRADING AND SITE PREPARATION WORK SHALL CONFORM WITH THE RECOMMENDATIONS ANDSPECIFICATIONS CONTAINED IN THE GEOTECHNICAL REPORT BY LANGAN DATED 03/29/2022, PROJECTNUMBER 140206001.20.CONTRACTOR SHALL CAREFULLY PRESERVE ALL SITE BENCHMARKS AND REFERENCE POINTS DURINGCONSTRUCTION OPERATIONS.21.CONTRACTOR IS SPECIFICALLY CAUTIONED THAT THE LOCATION AND/OR ELEVATION OF EXISTINGUTILITIES AS SHOWN ON THESE PLANS IS BASED ON RECORDS OF THE VARIOUS UTILITY COMPANIES AND,WHERE POSSIBLE, MEASUREMENTS TAKEN IN THE FIELD. THE INFORMATION IS NOT TO BE RELIED ON ASBEING EXACT OR COMPLETE. THE CONTRACTOR MUST CALL THE LOCAL UTILITY LOCATION CENTER ATLEAST FORTY-EIGHT (48) HOURS BEFORE ANY EXCAVATION TO REQUEST EXACT FIELD LOCATIONS OFTHE UTILITIES. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO RELOCATE ALL EXISTINGUTILITIES WHICH CONFLICT WITH THE PROPOSED SITE IMPROVEMENTS SHOWN ON THE PLANS.22.CONTRACTOR SHALL INSTALL APPROPRIATE TREE PROTECTION MEASURES PRIOR TO COMMENCEMENTOF SITE GRADING OPERATIONS.23.CONTRACTOR SHALL UTILIZE CARE WHEN WORKING NEAR EXISTING UTILITIES TO REMAIN. ANY DAMAGETO EXISTING UTILITIES NOT NOTED TO BE REMOVED SHALL BE REPAIRED AT THE CONTRACTOR'SEXPENSE AND TO THE SATISFACTION OF THE OWNER AND/OR ENGINEER.24.CONTRACTOR SHALL REPAIR AT HIS EXPENSE ANY DAMAGE TO EXISTING ASPHALT, CONCRETE, CURBS,SIDEWALKS, ETC. RESULTING FROM CONSTRUCTION TRAFFIC AND/OR OPERATIONS. REPAIRS SHALL BEMADE TO THE SATISFACTION OF THE OWNER AND/OR ENGINEER.25.CONTRACTOR SHALL RESTORE ALL DISTURBED AREAS OUTSIDE OF CONSTRUCTION LIMITS TO ORIGINALCONDITION OR BETTER.26.MAXIMUM CROSS SLOPES AND LONGITUDINAL SLOPES FOR ALL CONCRETE SIDEWALKS AND HANDICAPACCESSIBLE ROUTES SHALL NOT EXCEED 2% AND 5%, RESPECTIVELY.27.MAXIMUM SLOPES WITHIN THE HANDICAP ACCESSIBLE PARKING AREAS SHALL NOT EXCEED 2% IN ANYDIRECTION.28.MAXIMUM GRADE DIFFERENCE BETWEEN PAVEMENT SURFACES AND ADJACENT CONCRETE SIDEWALKSFOR THE ACCESSIBLE ROUTE TO THE BUILDING SHALL NOT EXCEED 1/4" VERTICAL OR 1/2" WHENBEVELED.29.ALL HANDICAP ACCESSIBLE EXTERIOR DOORWAY LOCATIONS REQUIRE AN EXTERIOR LANDING THAT IS AMINIMUM OF FIVE (5) FEET IN LENGTH WITH A SLOPE NOT EXCEEDING 2% IN ANY DIRECTION.30.EXCAVATION SHORING SHALL BE DONE AS NECESSARY FOR THE PROTECTION OF THE WORK AND FORTHE SAFETY OF PERSONNEL. SHORING SHALL BE IN ACCORDANCE WITH ALL O.S.H.A AND LOCALREGULATIONS.31.ALL STRUCTURE BENCH WALLS SHALL BE SHAPED AND FORMED FOR A CLEAN TRANSITION WITH PROPERHYDRAULICS TO ALLOW THE SMOOTH CONVEYANCE OF FLOWS THROUGH THE MANHOLE OR BOX INLET.THE BENCH WALL SHALL FORM A DEFINED CHANNEL, TO A MINIMUM HEIGHT OF 80-PERCENT OF THEINSIDE DIAMETER OF THE INLET AND OUTLET PIPES TO FORM A “U” SHAPED CHANNEL, CONSTRUCTED ATA MINIMUM ½-INCH PER FOOT SLOPE TO THE MANHOLE WALL.32.ALL STORM WATER INLETS AND CATCH BASIN CASTINGS SHALL HAVE THE WORDS “NO DUMPING, DRAINSTO STREAM", OR SIMILARLY APPROVED MESSAGE, CAST IN RAISED OR RECESSED LETTERS AT A MINIMUMOF 1” IN HEIGHT. IN ADDITION, A SYMBOL OF A FISH SHALL ALSO BE CAST WITH THE LETTERS.GENERAL UTILITY NOTES1.CONTRACTOR IS SPECIFICALLY CAUTIONED THAT THE LOCATION AND/OR ELEVATION OF EXISTINGUTILITIES AS SHOWN ON THESE PLANS IS BASED ON RECORDS OF THE VARIOUS UTILITY COMPANIES AND,WHERE POSSIBLE, MEASUREMENTS TAKEN IN THE FIELD. THE INFORMATION IS NOT TO BE RELIED ON ASBEING EXACT OR COMPLETE. THE CONTRACTOR MUST CALL THE LOCAL UTILITY LOCATION CENTER ATLEAST FORTY-EIGHT (48) HOURS BEFORE ANY EXCAVATION TO REQUEST EXACT FIELD LOCATIONS OFTHE UTILITIES. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO RELOCATE ALL EXISTINGUTILITIES WHICH CONFLICT WITH THE PROPOSED SITE IMPROVEMENTS SHOWN ON THE PLANS.2.CONTRACTOR SHALL UTILIZE CARE WHEN WORKING NEAR EXISTING UTILITIES TO REMAIN. ANY DAMAGETO EXISTING UTILITIES NOT NOTED TO BE REMOVED SHALL BE REPAIRED AT THE CONTRACTOR'SEXPENSE AND TO THE SATISFACTION OF THE OWNER AND/OR ENGINEER.3.CONTRACTOR SHALL EXCAVATE AND VERIFY IN FIELD ALL EXISTING UTILITY LOCATIONS, SIZES,CONDITIONS AND ELEVATIONS AT PROPOSED POINTS OF CONNECTION PRIOR TO COMMENCING ANYUNDERGROUND CONSTRUCTION. CONTRACTOR SHALL NOTIFY THE OWNER AND ENGINEER OF ANYDISCREPANCIES OR CONFLICTS PRIOR TO PROCEEDING WITH CONSTRUCTION.4.ALL PROPOSED CONNECTIONS TO EXISTING UTILITY STRUCTURES OR PIPING SHALL BE IN ACCORDANCEWITH THE APPLICABLE GOVERNING AUTHORITY REQUIREMENTS AND SPECIFICATIONS.5.CONTRACTOR SHALL CONTINUOUSLY MAINTAIN ALL EXISTING SEWER SYSTEMS DURING CONSTRUCTIONOPERATIONS AS NECESSARY TO PREVENT SILT OR DEBRIS ACCUMULATION.6.CONTRACTOR TO COORDINATE FRANCHISE UTILITIES.STORM SEWER NOTES1.ALL STORM SEWER CONSTRUCTION SHALL BE PERFORMED IN ACCORDANCE WITH THE NOTES IN THEPLANS AND THE STANDARDS, SPECIFICATIONS, CODES AND ORDINANCES OF THE LOCAL GOVERNINGAUTHORITIES. IN CASE OF CONFLICT, THE MORE STRINGENT CODE SHALL TAKE PRECEDENCE.2.STORM SEWER PIPE AND STRUCTURES SHALL BE FURNISHED AND INSTALLED IN ACCORDANCE WITHLOCAL REQUIREMENTS AND SPECIFICATIONS.3.RCP STORM SEWER PIPE 12" IN DIAMETER AND LARGER SHALL BE REINFORCED CONCRETE PIPE, CLASSIii, PER ASTM C76 WITH FLEXIBLE (O-RING) GASKET JOINTS IN CONFORMANCE WITH ASTM C443.4.HDPE STORM SEWER PIPE SHALL BE HIGH DENSITY POLYETHYLENE PIPE PER ASTM F2306 WITHWATERTIGHT JOINTS CONFORMING TO ASTM D3212.5.STORM SEWER TRENCH EXCAVATIONS AND PIPE FOUNDATION, BEDDING AND HAUNCHING SHALL BECONSTRUCTED IN ACCORDANCE WITH LOCAL REQUIREMENTS AND SPECIFICATIONS.5.1.STORM SEWERS MUST BE PLACED ON PROPERLY COMPACTED STONE BEDDING. PIPE BEDDINGMATERIAL SHALL BE A MINIMUM OF FOUR (4) INCHES THICK UNDER THE BARREL OF THE PIPE ANDFOR PVC PIPE, MATERIAL SHALL BE EXTENDED A MINIMUM OF 12" OVER THE TOP OF THE PIPEPER ASTM D2321. PIPE BEDDING MATERIAL SHALL BE CRUSHED GRAVEL OR STONE MEETINGLOCAL STANDARD GRADATIONS.5.2.TRENCH BACKFILL MATERIAL SHALL BE PLACED AND COMPACTED TO A MINIMUM OF 98%STANDARD PROCTOR MAXIMUM DRY DENSITY, PER ASTM D698, OVER ALL STORM SEWERSWHICH ARE CONSTRUCTED UNDER, OR WITHIN TWO (2) FEET OF, ANY PROPOSED OR EXISTINGPAVEMENT, PARKING LOTS OR SIDEWALKS.6.REQUIRED STORM STRUCTURE RIM ADJUSTMENTS SHALL BE MADE WITH PRECAST CONCRETEADJUSTING RINGS NOT TO EXCEED A MAXIMUM OF EIGHT (8) INCHES IN OVERALL HEIGHT. A MAXIMUM OFTWO (2) ADJUSTING RINGS ARE ALLOWED. BUTYLROPE JOINT SEALANT SHALL BE USED ON ALL JOINTSBETWEEN THE PRECAST ELEMENTS.7.FIELD TILE ENCOUNTERED DURING CONSTRUCTION OPERATIONS SHALL BE CONNECTED TO THEPROPOSED STORM SEWER SYSTEM OR EXTENDED TO OUTLET INTO A PROPOSED DRAINAGE WAY. IF THISCANNOT BE ACCOMPLISHED, THEN IT SHALL BE REPAIRED WITH NEW PIPE OF SIMILAR SIZE ANDMATERIAL TO THE ORIGINAL LINE AND PUT IN ACCEPTABLE OPERATING CONDITION. A RECORD OF THELOCATION OF ALL FIELD TILE OR DRAIN PIPE ENCOUNTERED SHALL BE KEPT BY THE CONTRACTOR ANDTURNED OVER TO THE OWNER AND/OR ENGINEER UPON COMPLETION OF THE PROJECT ANDACCURATELY SHOWN ON THE RECORD DRAWINGS.WATER AND SEWER SEPARATION NOTES1.WATER MAINS SHALL BE LOCATED AT LEAST TEN (10) FEET HORIZONTALLY FROM ANY EXISTING ORPROPOSED DRAIN, STORM SEWER, SANITARY SEWER, COMBINED SEWER, OR SEWER SERVICECONNECTION.2.WATER MAINS MAY BE LOCATED CLOSER THAN TEN (10) FEET TO A SEWER LINE WHEN:2.1.LOCAL CONDITIONS PREVENT A LATERAL SEPARATION OF TEN (10) FEET; AND2.2.THE WATER MAIN INVERT IS AT LEAST EIGHTEEN (18) INCHES ABOVE THE CROWN OF THE SEWER;AND2.3.THE WATER MAIN IS EITHER IN A SEPARATE TRENCH OR IN THE SAME TRENCH ON ANUNDISTURBED EARTH SHELF LOCATED TO ONE SIDE OF THE SEWER.3.WHEN IT IS IMPOSSIBLE TO MEET 1) OR 2) ABOVE, BOTH THE WATER MAIN AND DRAIN OR SEWER SHALLBE CONSTRUCTED OF SLIP-ON OR MECHANICAL JOINT CAST OR DUCTILE IRON PIPE, PRE-STRESSEDCONCRETE PIPE, OR PVC PIPE EQUIVALENT TO WATER MAIN STANDARDS OF CONSTRUCTION. THE DRAINOR SEWER SHALL BE PRESSURE TESTED FOR THE MAXIMUM EXPECTED SURCHARGE HEAD PRIOR TOBACKFILLING.4.WATER MAINS SHALL BE SEPARATED FROM A SEWER SO THAT ITS INVERT IS A MINIMUM OF EIGHTEEN (18)INCHES ABOVE THE CROWN OF THE DRAIN OR SEWER WHENEVER WATER MAINS CROSS STORM SEWERS,SANITARY SEWERS, OR SEWER SERVICE CONNECTIONS. THE VERTICAL SEPARATION SHALL BEMAINTAINED FOR THAT PORTION OF THE WATER MAIN LOCATED WITHIN TEN (10) FEET HORIZONTALLY OFANY SEWER OR DRAIN CROSSED. A LENGTH OF WATER MAIN PIPE SHALL BE CENTERED OVER THE SEWERTO BE CROSSED WITH JOINTS EQUIDISTANT FROM THE SEWER OR DRAIN.5.BOTH THE WATER MAIN AND SEWER SHALL BE CONSTRUCTED OF SLIP-ON OR MECHANICAL JOINT CASTOR DUCTILE IRON PIPE, PRE-STRESSED CONCRETE PIPE, OR PVC PIPE EQUIVALENT TO WATER MAINSTANDARDS OF CONSTRUCTION WHEN:5.1.IT IS IMPOSSIBLE TO OBTAIN THE PROPER VERTICAL SEPARATION AS DESCRIBED IN 4) ABOVE;OR THE WATER MAIN PASSES UNDER A SEWER OR DRAIN6.A VERTICAL SEPARATION OF EIGHTEEN (18) INCHES BETWEEN THE INVERT OF THE SEWER OR DRAIN ANDTHE CROWN OF THE WATER MAIN SHALL BE MAINTAINED WHERE A WATER MAIN CROSSES UNDER ASEWER. THE SEWER OR DRAIN LINES SHALL BE SUPPORTED TO PREVENT SETTLING AND BREAKING OFTHE WATER MAIN, AS SHOWN ON THE PLANS OR AS APPROVED BY THE ENGINEER.7.CONSTRUCTION SHALL EXTEND ON EACH SIDE OF THE CROSSING UNTIL THE PERPENDICULAR DISTANCEFROM THE WATER MAIN TO THE SEWER OR DRAIN LINE IS AT LEAST TEN (10) FEET.WATER MAIN AND SERVICE NOTES1.ALL WATER MAIN CONSTRUCTION SHALL BE PERFORMED IN ACCORDANCE WITH THE NOTES IN THEPLANS AND THE STANDARDS, SPECIFICATIONS, CODES AND ORDINANCES OF THE LOCAL GOVERNINGAUTHORITIES. IN CASE OF CONFLICT, THE MORE STRINGENT CODE SHALL TAKE PRECEDENCE.2.WATER MAIN PIPE AND STRUCTURES SHALL BE FURNISHED AND INSTALLED IN ACCORDANCE WITH LOCALREQUIREMENTS AND SPECIFICATIONS.3.WATER MAIN SHALL BE DUCTILE IRON PIPE, CLASS 52 IN ACCORDANCE WITH AMERICAN WATER WORKSASSOCIATION (AWWA) STANDARDS C151, C111 AND C104, UNLESS OTHERWISE NOTED.4.UNLESS OTHERWISE NOTED ON THE PLANS, ALL WATER MAIN PIPE SHALL BE LAID WITH A MINIMUMCOVER OF FOUR AND AND HALF (4.5) FEET FROM THE PROPOSED FINISH GRADE INDICATED ON THEPLANS OR TO THE SPECIFIC TOP OF PIPE ELEVATION INDICATED ON THE PLANS FOR THE WATER MAIN. NOBERMS ARE ALLOWED OVER WATER MAINS EXCLUSIVELY FOR THE PURPOSE OF OBTAINING ADEQUATEGROUND COVER.5.DUCTILE IRON WATER MAIN PIPE SHALL BE CONSTRUCTED WITH A MINIMUM OF 8-MIL POLYETHYLENEENCASEMENT TO PREVENT CORROSION.6.WATER MAIN TRENCH EXCAVATIONS AND PIPE FOUNDATION, BEDDING AND HAUNCHING SHALL BECONSTRUCTED IN ACCORDANCE WITH LOCAL REQUIREMENTS AND SPECIFICATIONS.6.1.WATER MAINS MUST BE PLACED ON PROPERLY COMPACTED STONE BEDDING. PIPE BEDDINGMATERIAL SHALL BE A MINIMUM OF FOUR (4) INCHES THICK UNDER THE BARREL OF THE PIPE.PIPE BEDDING MATERIAL SHALL BE CRUSHED GRAVEL OR STONE MEETING LOCAL STANDARDGRADATIONS.6.2.TRENCH BACKFILL MATERIAL SHALL BE PLACED AND COMPACTED TO A MINIMUM OF 98%STANDARD PROCTOR MAXIMUM DRY DENSITY, PER ASTM D698, OVER ALL WATER MAINS WHICHARE CONSTRUCTED UNDER, OR WITHIN TWO (2) FEET OF, ANY PROPOSED OR EXISTINGPAVEMENT, PARKING LOTS OR SIDEWALKS.7.A WATERTIGHT PLUG SHALL BE PLACED IN THE END OF THE WATER MAIN PIPE AT THE END OF EACHCONSTRUCTION DAY.8.UPON COMPLETION OF THE WATERMAIN CONSTRUCTION, ALL WATER MAIN SHALL BE TESTED INACCORDANCE WITH THE FOLLOWING MINIMUM STANDARDS:8.1.HYDROSTATIC PRESSURE AND LEAKAGE TESTS IN ACCORDANCE WITH LOCAL REQUIREMENTSAND SPECIFICATIONS AND SHALL BE WITNESSED BY THE LOCAL GOVERNING AUTHORITY.8.2.DISINFECTION IN ACCORDANCE WITH LOCAL REQUIREMENTS AND THE METHODS STATED INAWWA STANDARD C651 AND WITNESSED BY THE LOCAL GOVERNING AUTHORITY.9.WATER SERVICE PIPING AND STRUCTURES SHALL BE FURNISHED AND INSTALLED IN ACCORDANCE WITHLOCAL REQUIREMENTS AND SPECIFICATIONS.10.WATER SERVICE LINES 2" IN DIAMETER OR SMALLER SHALL BE TYPE 'K' COPPER TUBING CONFORMING TOASTM B88-14. NO COUPLINGS SHALL BE PERMITTED BETWEEN THE CORPORATION AND CURB STOPS ORBETWEEN THE CURB STOP AND THE BUILDING.11.WATER SERVICE FITTINGS INCLUDING CORPORATION STOPS, SERVICE BOXES AND BUFFALO BOXESSHALL BE FURNISHED IN ACCORDANCE WITH LOCAL REQUIREMENTS AND SPECIFICATIONS.12.SERVICE BOXES SHALL BE OF SUFFICIENT LENGTH TO PERMIT THE TOP TO BE INSTALLED FLUSH WITHTHE FINISHED GRADE. EACH SERVICE BOX SHALL BE PROVIDED WITH A CAP WITH THE WORD "WATER"CAST IN THE TOP.13.VALVES, VALVE BOXES OR VAULTS SHALL BE FURNISHED AND INSTALLED IN ACCORDANCE WITH LOCALREQUIREMENTS.14.PRESSURE CONNECTIONS TO THE EXISTING WATER MAIN SHALL BE CONSTRUCTED IN ACCORDANCEWITH LOCAL REQUIREMENTS AND SPECIFICATIONS AND SHALL INCLUDE THE INSTALLATION OF A FULLSTAINLESS STEEL TAPPING SADDLE.15.VALVE VAULTS SHALL HAVE A MINIMUM DIAMETER OF FIVE (5) FEET BELOW THE PRECAST CONCRETECONE SECTION. THE VAULTS SHALL BE CONSTRUCTED OF PRECAST CONCRETE SECTIONS AND SHALLCONFORM TO THE DETAILS SPECIFIED ON THE PLANS. ALL VALVE VAULTS SHALL BE LEAK PROOF.16.TEMPORARY CONNECTIONS FOR CONSTRUCTION PURPOSES TO NEWLY INSTALLED OR EXISTING WATERMAINS SHALL BE MADE AND METERED IN ACCORDANCE WITH LOCAL REQUIREMENTS.17.REQUIRED RIM ADJUSTMENTS SHALL BE MADE WITH PRECAST CONCRETE ADJUSTING RINGS NOT TOEXCEED A MAXIMUM OF EIGHT (8) INCHES IN OVERALL HEIGHT. A MAXIMUM OF TWO (2) ADJUSTING RINGSARE ALLOWED. BUTYLROPE JOINT SEALANT SHALL BE USED ON ALL JOINTS BETWEEN THE PRECASTELEMENTS.18.BENDS ON 4" AND GREATER WATER LINES SHALL BE PROVIDED WITH RESTRAINED JOINTS. (MEGALUGSERIES 2000 OR APPROVED EQUAL)PAVEMENT GENERAL NOTES1.SEE GEOTECH REPORT FOR ANY SPECIAL EXCAVATION AND FILL REQUIREMENTS.2.LIMIT OPERATIONS TO THE PUBLIC RIGHT-OF-WAYS AND EASEMENTS OR INDICATED PROJECT LIMITS.THE CONTRACTOR SHALL NOT UTILIZE PRIVATE PROPERTY UNLESS HE HAS SUBMITTED A COPY OF THEPROPERTY OWNER'S WRITTEN PERMISSION TO THE OWNER'S REPRESENTATIVE.3.ALL SLOPES IN PAVEMENT SHALL BE UNIFORM TO AVOID PONDING.4.REMOVE AND REPLACE OR RESTORE ALL STREET SIGNS, PAVEMENT MARKINGS, SIDEWALK LAMPS,SIDEWALKS, STEPS, LANDSCAPE STRUCTURES, CURB AND GUTTER, STREETS, DRIVES, AND ALL OTHERSURFACE STRUCTURES REMOVED OR OTHERWISE DAMAGED DURING THE COURSE OF THE WORK.SIDEWALKS SHALL BE REMOVED AND REPLACED TO NEAREST JOINT BEYOND CONSTRUCTION AREA.5.COMPACT SUBGRADE BENEATH PAVEMENTS IN ACCORDANCE WITH GRADING NOTES.PAVEMENT MARKING NOTES1.PAINT PARKING STRIPING AND SIDEWALK CURBS PER OWNER DIRECTION AND LOCAL CODES WHERESHOWN ON PLANS. MINIMUM CURING TIME FOR PAVING SHALL BE 7 DAYS.2.PAINT ADA SYMBOLS AND STRIPING PER LOCAL CODES WHERE SHOWN ON PLANS.3.PAVEMENT MARKINGS SHALL CONFORM TO LOCAL CODES. IF REQUIRED, REFLECTORIZED SPHERES FORTRAFFIC PAINT SHALL MEET THE REQUIREMENTS OF LOCAL CODES.4.PAINTING SHALL NOT BEGIN UNTIL PAVEMENT SURFACE HAS BEEN POWER BROOMED AND HAND SWEPTAS NECESSARY TO REMOVE LOOSE MATERIALS AND DIRT; AND NOT BEFORE ADEQUATE CURING TIMEHAS BEEN OBTAINED ON THE PAVEMENT.5.APPLY PAINT AT MANUFACTURER'S RECOMMENDED RATES IN TWO SEPARATE COATS FOR ALL PAVEMENTMARKINGS. ALL STRIPES ARE 4 INCHES WIDE UNLESS OTHERWISE INDICATED. ADA SYMBOLS SHALLCONFORM TO APPLICABLE ADA REGULATIONS.SURFACE AREA RESTORATION NOTES1.PAINT PARKING STRIPING AND SIDEWALK CURBS PER OWNER DIRECTION AND LOCAL CODES WHERESHOWN ON PLANS. MINIMUM CURING TIME FOR PAVING SHALL BE 7 DAYS.2.PAINT ADA SYMBOLS AND STRIPING PER LOCAL CODES WHERE SHOWN ON PLANS.3.PAVEMENT MARKINGS SHALL BE FAST DRY TRAFFIC LANE MARKING PAINT CONFORMING TO OKLAHOMADOT STANDARD SPECIFICATION FOR HIGHWAY AND BRIDGE CONSTRUCTION, LATEST EDITION.REFLECTORIZED SPHERES FOR TRAFFIC PAINT SHALL MEET THE REQUIREMENTS OF OKLAHOMA DOTSTANDARD SPECIFICATION FOR HIGHWAY AND BRIDGE CONSTRUCTION, LATEST EDITION.4.PAINTING SHALL NOT BEGIN UNTIL PAVEMENT SURFACE HAS BEEN POWER BROOMED AND HAND SWEPTAS NECESSARY TO REMOVE LOOSE MATERIALS AND DIRT; AND NOT BERFORE ADEQUATE CURING TIMEHAS BEEN OBTAINED ON THE PAVEMENT.5.APPLY PAINT AT MANUFACTURER'S RECOMMENDED RATES IN TWO SEPARATE COATS FOR ALL PAVEMENTMARKINGS. ALL STRIPES ARE 4 INCHES WIDE UNLESS OTHERWISE INDICATED. ADA SYMBOLS SHALLCONFORM TO APPLICABLE ADA REGULATIONS.EROSION CONTROL NOTES1.USE ALL AVAILABLE MEANS TO MINIMIZE THE AMOUNT OF SOIL EROSION CAUSED BY THE WORK OF THEPROJECT. THIS INCLUDES RESPONSIBILITY FOR MAINTENANCE OF ALL SOIL EROSION CONTROL DEVICESINDICATED. REPAIRS TO SOIL EROSION CONTROL DEVICES SHALL BE COMPLETED WITHIN 2 DAYS FROMNOTIFICATION.2.EROSION CONTROL DEVICES SHALL BE CHECKED ONCE PER WEEK AND AFTER EACH RAINFALL TOENSURE WORKING ORDER.3.SILT FENCE SHALL BE LOCATED AS SHOWN ON THE PLANS.4.SEED ALL DISTURBED AREAS EXPOSED FOR MORE THAN 21 DAYS WITH A STABILIZING CROP PER MASSDEP SPECIFICATIONS.STORM WATER POLLUTION PREVENTION PLAN1.A STORM WATER POLLUTION PREVENTION PLAN (SWPPP) IS INCLUDED IN THE PROJECT DOCUMENTS. THECONTRACTOR SHALL BE RESPONSIBLE FOR IMPLEMENTING THE PLAN WITHIN THE CONTRACT LIMITS OFTHE PROJECT.2.THE CONTRACTOR AND ALL SUBCONTRACTORS ARE REQUIRED TO SIGN A COPY OF THE CERTIFICATIONSTATEMENT CONTAINED IN THE PLAN, PRIOR TO START OF CONSTRUCTION. THE SIGNED COPIES SHALLBE KEPT WITH THE SWPPP IN THE CONTRACTORS FIELD OFFICE UNTIL THE PROJECT IS COMPLETE.3.THE CONTRACTOR SHALL PROVIDE INSPECTION OF THE CONSTRUCTION SITE AND MAINTAIN INSPECTIONRECORDS IN ACCORDANCE WITH THE SWPPP.4.COPIES OF THE PLAN, ALL INSPECTION REPORTS AND CERTIFICATIONS PREPARED BY THE CONTRACTORSHALL BE FORWARDED TO THE OWNER.APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023 DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C002GENERAL NOTES & LEGENDS EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\General Notes & Legends.dwg1/17/2023 2:42:17 PM GENERAL SITEEXISTING STRUCTUREPLAN MARKDESCRIPTIONLEGENDGUARD POST/ BOLLARDMAILBOXPARKING METERHANDICAPPED PARKINGNAIL FOUNDSHRUBDECIDUOUS TREECONIFEROUS TREESINGLE POLE SIGNLEGENDDOUBLE POLE SIGNTRAFFIC SIGNAL WITH ARMPLAN MARKSURVEYDESCRIPTIONBENCH MARKLEGENDIRON ROD - FOUNDIRON ROD - SETSECTION CORNER FOUNDMONUMENT SETRIGHT OF WAY MARKERSTATION MARKERMONITORING WELLX CUT SETX CUT FOUNDFLOODLIGHTUTILITIESDESCRIPTIONPLAN MARKHANDHOLESIGNAL BOXLIGHT POLE OVERHANGSIREN POLEUTILITY POLELIGHT POSTFIRE HYDRANTGUY ANCHORFLARED END SECTIONVALVEUTILITY END CAPPOST INDICATOR VALVECLEANOUTCABLE TV PEDESTALJUNCTION BOXMANHOLEDRAINAGE MANHOLEELECTRICAL MANHOLETELEPHONE PEDESTALSANITARY MANHOLETELEPHONE MANHOLEVAULT BOXCURB INLETINTAKE - CIRCLEINTAKE - SQUAREINTAKE - RECTANGLERA-5 INTAKERA-3 INTAKERA-8 INTAKESOIL BORINGGAS METERELECTRIC METERTRANSFORMERWATER METERWIRE FENCEXWOOD FENCECHAINLINK FENCECONTROL POINT621620MAJOR CONTOURMINOR CONTOURWATER MANHOLEGUARD RAILRAILROADTREE LINEAIR CONDITIONERRECORD BEARING/DISTANCE(00)00MEASURED BEARING/DISTANCEPOBPOINT OF BEGINNINGPORPOINT OF REFERENCEFLAGPOLEWWATER IRRIGATION VALVEWATER SHUTOFF VALVEUTILITY POLE W/ TRANSFORMERTRAFFIC SIGNALNAIL SETUTILITY MARKERRAILROAD CROSSING SIGNALYARD HYDRANTFIRE DEPARTMENT VALVEGAS REGULATORROOF DOWNSPOUTTRAFFIC MANHOLEGENERAL SITE DESIGNPLAN MARKDESCRIPTIONLEGENDSLOPE ARROWFLOW ARROWGUT C TOP OF CURB AND GUTTER ELEVATIONSPOT ELEVATION625.00LEGENDUTILITY LINESEXISTING LINE TYPEDESCRIPTIONELECTRIC - OVERHEADELECTRIC - UNDERGROUNDGAS MAINWATER MAINSANITARY SEWERSTORM SEWERTELEPHONE - OVERHEADTELEPHONE - UNDERGROUNDCABLE LINE - OVERHEADCABLE LINE - UNDERGROUNDFIBER OPTICSPROCESS/HEATING STEAMSILT FENCELIMITSPROPOSED LINE TYPETRAFFIC FLOWRIGHT-TURN ARROWTHRU ARROWLEFT/ THRU ARROWRIGHT/ THRU ARROWLEFT-TURN ARROWLEFT/ RIGHT/ THRU ARROW2%SANITARY FORCE MAINALL CONSTRUCTION MATERIALS AND SITE WORK INDICATED ON THESE PLANSSHALL BE FURNISHED AND INSTALLED IN ACCORDANCE WITH THE LATESTEDITION OF THE CITY OF AUBURN SUPPLEMENTAL SPECIFICATIONS TOMASSDOT. IN THE EVENT OF A CONFLICT WITH ANY NOTES OR DETAILSCONTAINED WITHIN THE PLANS, THE CITY OF AUBURN SUPPLEMENTALSPECIFICATIONS SHALL TAKE PRECEDENCE.CITY OF AUBURN SUPPLEMENTALSPECIFICATIONSTHE LOCATIONS OF UTILITY MAINS, STRUCTURES, AND SERVICECONNECTIONS PLOTTED ON THIS DRAWING ARE APPROXIMATE ONLY ANDWERE OBTAINED FROM RECORDS MADE AVAILABLE TO SHIVE-HATTERY,INC. THERE MAY BE OTHER EXISTING UTILITY MAINS, STRUCTURES, ANDSERVICE CONNECTIONS NOT KNOWN TO SHIVE-HATTERY, INC., AND NOTSHOWN ON THIS DRAWING.UTILITY NOTEFIBER OPTIC BOXAPRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023 WILLOW STREETPRELIMINARY AARONS WAY PRELIMINARY WILLOW STREETPRELIMINARY PRELIMINARY PRELIMINARY WILLOW STREET 303030 30303035353131 31 3132323232323232 333333333434 3 03031313131 31313232 3 2 3232323232 333333 333333333333333334343434 3435323233333333333333333334363738 303535 28 2 8 28 2929 29 31313132 3232 32 32 33 33 33 33 333334 3 4 34 343636 30 30 30303 0 282931 32 32 30 30 3030 35 35 2 7272 8 28 2929 313131 3 13232 3232 32 323232 333333 33 333334343636 303 5 3 5 2931313 131 3 1 323232 33 3334 343735 3735363333PROTECT EXISTING FENCE.COORDINATE WITH OWNER IFREMOVE AND REPLACE ISREQUIRED FOR TREE REMOVALPROTECT ALL EXISTINGTREES NOT WITHIN THEREMOVAL LIMITSPROPERTYLINE, TYP.PROPERTYLINE, TYP.EXIST. STORAGE AREA200' BUFFER FORRIVER, TYP.(FIELD DELINEATED)DISTURBANCELIMITS, TYP.DISTURBANCELIMITS, TYP.EXISTING 20'EASEMENTEXISTING GASLINE, TYP.PROPERTY LINE, TYP.EXISTING CREEKDISTURBANCELIMITS, TYP.ADJACENTPROPERTYLINE, TYP.PROTECT ALL EXISTINGTREES NOT WITHIN THEREMOVAL LIMITSWETLAND LIMITS, TYP.(FIELD DELINEATED)100 BUFFER FORWETLAND, TYP.(FIELD DELINEATED)EXISTING FENCE, TYP.CONTRACTOR MAY REMOVE ANDREPLACE EXISTING FENCE ASNECESSARY FOR CONSTRUCTION.CONTRACTOR TO COORDINATEREMOVAL WITH OWNER PRIOR TOSTART OF CONSTRUCTION.TREE REMOVAL WITHIN200' BUFFER TO OCCURAFTER CONSERVATIONPERMIT APPROVALAPRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023TREE CLEAR AND GRUB REMOVALAPPROX. 3.93 ACRESLEGEND:GENERAL NOTES:1.CONTRACTOR TO CONFIRM THE HORIZONTAL ANDVERTICAL LOCATION OF ALL EXISTING UTILITIES ANDINFORM THE ENGINEER OF ANY POTENTIAL CONFLICTSWITH PROPOSED UTILITIES PRIOR TO CONSTRUCTION.2.ALL UTILITIES AND PAVEMENT NOT SHOWN TO BEREMOVED SHALL BE PROTECTED. IF DAMAGED, IT ISTHE CONTRACTOR'S RESPONSIBILITY TO REPLACEAND REPAIR.3.CONTRACTOR SHALL COORDINATE WITH OWNER,UTILITY PROVIDER, AND ANY AFFECTED ADJACENTPROPERTY OWNERS OR EXISTING TENANTS PRIOR TOANY SERVICE OR ACCESS DISRUPTIONS.4.CONTRACTOR TO FOLLOW ALL APPLICABLE TRAFFICCONTROL AND SAFETY WHEN WORKING WITHIN THESTREET RIGHT OF WAY. CONTRACTOR TOCOORDINATE WITH THE TOWN OF YARMOUTH PRIORTO CONSTRUCTION WITHIN THE RIGHT OF WAY.DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:CD01DEMOLITION PLAN - TREE CLEARING EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Existing Conditions.dwg1/17/2023 2:43:03 PM DISTURBANCE LIMITSAPPROX. 4.12 ACRESASPHALT REMOVAL BY OTHERSAPPROX. 35 SYSHOWN FOR REFERENCE ONLYTOTAL PROJECT AREATOTAL PROPERTY = 1,688,835 SF = 38.77 ACRES = 100%TREE REMOVAL AREA = 171,191 SF = 3.93 ACRES = 10% WILLOW STREET 303030 30303035353131 31 3132323232323232 333333333434 3 03031313131 31313232 3 2 3232323232 333333 333333333333333334343434 3435323233333333333333333334363738 303535 28 2 8 28 2929 29 31313132 3232 32 32 33 33 33 33 333334 3 4 34 343636 30 30 30303 0 282931 32 32 30 30 3030 35 35 2 7272 8 28 2929 313131 3 13232 3232 32 323232 333333 33 333334343636 303 5 3 5 2931313 131 3 1 323232 33 3334 343735 3735363333 BEGIN FENCEREMOVALEND FENCEREMOVALREMOVE APPROX.392 LF OF FENCEREMOVE AND REPLACE PAVEMENTFOR UTILITY INSTALLATION.SEE NOTE 4/CD01PROTECT ALL EXISTINGTREES NOT WITHIN THEREMOVAL LIMITSPROPERTYLINE, TYP.PROPERTYLINE, TYP.EXIST. STORAGE AREA200' BUFFER FORRIVER, TYP.(FIELD DELINEATED)DISTURBANCELIMITS, TYP.DISTURBANCELIMITS, TYP.EXISTING 20'EASEMENTEXISTING GASLINE, TYP.PROPERTY LINE, TYP.EXISTING CREEKDISTURBANCELIMITS, TYP.ADJACENTPROPERTYLINE, TYP.PROTECT ALL EXISTINGTREES NOT WITHIN THEREMOVAL LIMITSWETLAND LIMITS, TYP.(FIELD DELINEATED)100 BUFFER FORWETLAND, TYP.(FIELD DELINEATED)EXISTING FENCE, TYP.CONTRACTOR MAY REMOVE ANDREPLACE EXISTING FENCE ASNECESSARY FOR CONSTRUCTION.CONTRACTOR TO COORDINATEREMOVAL WITH OWNER PRIOR TOSTART OF CONSTRUCTION.TREE REMOVAL WITHIN200' BUFFER TO OCCURAFTER CONSERVATIONPERMIT APPROVALAPRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023TREE CLEAR AND GRUB REMOVAL - BY OTHERSAPPROX. 3.93 ACRESSHOWN FOR REFERENCE ONLYLEGEND:GENERAL NOTES:1.CONTRACTOR TO CONFIRM THE HORIZONTAL ANDVERTICAL LOCATION OF ALL EXISTING UTILITIES ANDINFORM THE ENGINEER OF ANY POTENTIAL CONFLICTSWITH PROPOSED UTILITIES PRIOR TO CONSTRUCTION.2.ALL UTILITIES AND PAVEMENT NOT SHOWN TO BEREMOVED SHALL BE PROTECTED. IF DAMAGED, IT ISTHE CONTRACTOR'S RESPONSIBILITY TO REPLACEAND REPAIR.3.CONTRACTOR SHALL COORDINATE WITH OWNER,UTILITY PROVIDER, AND ANY AFFECTED ADJACENTPROPERTY OWNERS OR EXISTING TENANTS PRIOR TOANY SERVICE OR ACCESS DISRUPTIONS.4.CONTRACTOR TO FOLLOW ALL APPLICABLE TRAFFICCONTROL AND SAFETY WHEN WORKING WITHIN THESTREET RIGHT OF WAY. CONTRACTOR TOCOORDINATE WITH THE TOWN OF YARMOUTH PRIORTO CONSTRUCTION WITHIN THE RIGHT OF WAY.DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:CD02DEMOLITION PLAN EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Existing Conditions.dwg1/17/2023 2:43:21 PM DISTURBANCE LIMITSAPPROX. 4.12 ACRESASPHALT REMOVALAPPROX. 35 SYTOTAL PROJECT AREATOTAL PROPERTY = 1,688,835 SF = 38.77 ACRES = 100%TREE REMOVAL AREA = 171,191 SF = 3.93 ACRES = 10% WILLOW STREETR=35.0'R=35.0'TEMPORARYTRAILERSTEMPORARYPORTABLERESTROOMS5 PARKINGSTALLSPROP. DRIVEWAYCIRCULATION DRIVEWAYVEHICLE STORAGE AREAPROPERTY LINE, TYP.PROP. DRIVEWAYTEMPORARYGARBAGE BINSPARKING SETBACKLINE, TYP.PROPERTY LINE, TYP.CIRCULATION DRIVEWAYLANDSCAPE & SCREENING AREA 30' PARKING FRONTYARD SETBACK10' PARKING REARYARD SETBACKPROP. STORMWATERMANAGEMENT AREALANDSCAPE & SCREENING AREAPROPOSED EXTERIORFENCE, TYP.EXIST. STORAGE AREAPROP. DRIVEWAYCONNECTION200' BUFFER FORRIVER, TYP.(FIELD VERIFIED)TEMPORARY MOBILERESPONSE CENTERTEMPORARYGARBAGE BINPROPOSED STORMSEWER, TYP.PROP. MANUALSLIDING GATEPROP. MANUALSLIDING GATEDISTURBANCE LIMITS, TYP.DISTURBANCE LIMITS, TYP.DISTANCE BETWEEN EXISTINGAND PROPOSED DRIVEWAYEXISTING 20'EASEMENTEXISTING GASLINE, TYP.PROPOSED TREELINE, TYP.EXISTING TREELINE, TYP.PROPERTY LINE, TYP.EXISTING WATER MAIN, TYP.LOCATION SHOWN ISAPPROXIMATEPROPOSED FIREHYDRANT, TYP.STAGED LINE TRUCKS DURINGEMERGENCIES, TYP.SHOWN FOR REFERENCE ONLY.PROPOSED TRANSFORMERAND PANEL BOARDPROPOSED BOLLARD, TYP. (4)PROPOSED RETAINING WALL4.0'10.0'277.0'5.0'9.0'70.0'49.8'24. 0 ' 55. 0 ' 14 3 . 8 '203.1'84.4'289.3'30.0'45.0'28.0'2.0'20.0' 24.0'94.0'94.5'40.0'68.6'37. 6 '86.0'10.0'10.0'10.0'2.0'2.0'70.4'202.3'14 5 . 0 '290.0'81.7'29.6'9.0'5.0'9.0'14.0'30.0'9.0'5.0'35. 0 ' 39. 9 'PROP. STORMWATERMANAGEMENT AREAPROP. STORMWATERMANAGEMENT AREAMATERIAL LAYDOWN ANDPOLE STORAGE AREA~ 900 SYPROPOSED STORMSEWER, TYP.DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C101SITE PLAN EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Site Plan.dwg1/18/2023 5:34:35 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023ADDRESS484 WILLOW STREET, YARMOUTH, MA 02673TOTAL PROJECT AREAAREA DISTURBED 179,467 SF = 4.12 ACRESTOTAL PROPERTY = 1,688,835 SF = 38.77 ACRES = 100%EXISTING PERVIOUS = 1,078,866 SF = 24.76 ACRES = 64%EXISTING IMPERVIOUS = 609,970 SF = 14.00 ACRES = 36%PROPOSED PERVIOUS = 943,780 SF = 21.67 ACRES = 56%PROPOSED IMPERVIOUS = 745,055 SF = 17.10 ACRES = 44%FLOOD ZONEZONE "X" AREA OF MINIMAL FLOOD HAZARD PER FEMA MAP 25001C0567J EFFECTIVE 07/16/2014ZONING & USEEXISTING ZONING:B3 BUSINESS, AQUIFER PROTECTION DISTRICT, & R.O.A.D.PROPOSED ZONING (NO CHANGE):B3 BUSINESS, AQUIFER PROTECTION DISTRICT, & R.O.A.D.EXISTING USE:UNDEVELOPED WOODED AREAPROPOSED USE:GRAVEL VEHICLE STORAGE LOT AND PAVED INTERNAL RINGROADBUILDING SETBACKSFRONT YARD: 30'SIDE YARD: 10'REAR YARD: 30'PARKING SETBACKSFRONT YARD: 30' (PER DESIGN REVIEW COMMITTEE)SIDE YARD: 10' (DOES NOT ABUT RESIDENTIALLY ZONED PROPERTIES)REAR YARD: 10' (DOES NOT ABUT RESIDENTIALLY ZONED PROPERTIES)PARKING REQUIREMENTSPARKING LOT SPACES REQUIRED: 0PARKING LOT SPACES PROVIDED: 5ADA SPACES REQUIRED: 0ADA SPACES PROVIDED: 0VEHICLE STORAGE LOT SPACES REQUIRED: 0VEHICLE STORAGE LOT SPACES PROVIDED: 97EMPLOYEESTHE STORAGE LOT WILL ONLY BE USED DURING ENERGY EMERGENCIES, THEREFORE THERE IS NOT A CHANGE IN PERMANENT EMPLOYMENTLANDSCAPING NOTESEXISTING TREES OF AT LEAST 4" CALIPER WITHIN THE PARKINGBUFFERS SHALL BE RETAINED. IF SUCH TREES DO NOT EXIST, 3"CALIPER TREES (WITH EXPECTED MATURE HEIGHT OF AT LEAST20') SHALL BE PLANTED AT INTERVALS OF AT MOST 20' IN ALL BUFFERS.SNOW REMOVALFOR SNOW FALLS LESS THAN 1-FT IN HEIGHT, THE SNOW WILL BEPUSHED INTO THE STORMWATER BASIN OR INTO A CORNER OFTHE DRIVE AISLE.FOR SNOW FALLS OVER 1-FT IN HEIGHT, THE SNOW WILL BE MOVED OFF-PROPERTY.LEGEND:ASPHALT - STORAGE & CIRCULATION6" ASPHALT ON 9" SUBBASEASPHALT - ROADWAYMATCH EXISTING SECTION WILLOW STREETR=35.0'R=35.0'TEMPORARYGARBAGE BINSTEMPORARYGARBAGE BINTEMPORARYPORTABLERESTROOMS94.0'PROPOSEDFIRE HYDRANTDRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C102FIRE TRUCK ACCESS PLAN EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Exhibits\Fire Truck Exhibit - Option 1.dwg1/18/2023 5:30:20 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/202314.428.1931.31TrackWidth::Steering AngleLock to Lock Time::feetSpartan Gladiator29.36.08.208.2568.6'40.0'24.0' 35. 0 ' 45.0'70.0'MATERIAL LAYDOWN AREATEMPORARY MOBILERESPONSE CENTERTEMPORARYTRAILERS WILLOW STREET36-FT MANUAL SLIDING GATESEE DETAIL 1/C503PROPERTY LINE, TYP.PROPERTY LINE, TYP.DISTURBANCE LIMITS, TYP.DISTURBANCE LIMITS, TYP.FENCE CORNERN 2709165.17E 993740.54FENCE CORNERN 2709210.70E 993726.99FENCE CORNERN 2709511.21E 993890.98FENCE CORNERN 2709533.31E 993926.63FENCE CORNERN 2709368.39E 994228.85FENCE CORNERN 2709296.47E 994242.25FENCE CORNERN 2709278.61E 994218.59FENCE CORNERN 2709141.73E 994143.90312 LF OF CHAIN LINK FENCE42 LF OF CHAIN LINK FENCE233 LF OF CHAIN LINK FENCE57 LF OF CHAIN LINK FENCE46 LF OF CHAIN LINK FENCE156 LF OF CHAIN LINK FENCE404 LF OF CHAIN LINK FENCE48 LF OF CHAIN LINK FENCE50-FT MANUAL SLIDING GATESEE DETAIL 1/C503FENCE CORNERN 2709237.71E 993741.73FENCE CORNERN 2709503.82E 993980.67FENCE CORNERN 2709479.86E 994024.5662 LF OF CHAINLINK FENCETIE INTO EXISTING FENCEN 2709270.42E 994214.12EXISTING FENCE, TYP.CONTRACTOR TO REMOVE AND REPLACE EXISTINGFENCE AS NEEDED FOR CONSTRUCTION.CONTRACTOR TO COORDINATE REMOVAL WITHOWNER PRIOR TO START OF CONSTRUCTION.PROPOSED CHAIN LINK FENCE, TYP.SEE DETAIL 1/C503REFER TO LANDSCAPING SHEETSFOR ROCK ALONG FENCE LINEFENCE CORNERN 2709318.60E 994201.6828-FT MANUAL SLIDING GATESEE DETAIL 1/C503FENCE CORNERN 2709272.77E 994229.31CONTRACTOR TO PROTECTEXISTING POLESDRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C103FENCE PLAN EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Fence Plan.dwg1/18/2023 5:31:30 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023 1.10%0.85%1.10%1.28%0.99%1.31%0.85%1.24%1.24%1.07%1.08%1.19% 3.12% 1.95%0.92%1.10%1.29%1.02 % 0 . 5 1% 1.82% 3. 6 8% 3. 9 7 %3.35%1.62%1.81%5:13:1 3:1 7.49% 3:1 3:13:11.08%0.41%0.41%1.00%1.08%333533343031323029 31 32 5.86% 3:1 3:1 5.25%303 0 30303030303535 35352 8282929 2 9 29 292931 313131 31313 1 31 313131313 1 32323 2 3 2 3 2 32 3 232 32333333333333 3333333 3 3 3 3333333333333333333333 343 4 34 34 3434 35 35 3131 313131 3 2 323232 33 33 34 34 30 3030303535 353 5 2 727 28282929 31313 1 31 313131 3132 32 3232323232 32 32 32 33 3 3 33 33 33 3 334343434 36 363031323333WILLOW STREET3132 30303 0 30 3 1 32 32 333 0 3535 3131 3 2 3 2 33 3 3 3 4 3432323 . 4 3%3:1302931329:13:10. 6 7%1.31%1.19%0.54%3. 6 1 % 3:1 32. 8 2 % 5:1 0.97%0.32%5:11.08%3:1 3:13:15:14:15:13:14:13:14:13:15:15.02%6.61%7.96%313132331.98%10+0010+8020+0021+0022+0022+4530 + 0 0 31 + 0 0 31 + 6 4 40+0040+701.24%3:1 0.51%0.66%PROPERTY LINE, TYP.PARKING SETBACKLINE, TYP.PROPERTY LINE, TYP.30' PARKING FRONTYARD SETBACK10' PARKING REARYARD SETBACKPROP. STORMWATERMANAGEMENT AREALANDSCAPE & SCREENING AREAEXIST. STORAGE200' BUFFER FOR RIVER, TYP.(FIELD LOCATED)TS 34.50TS 33.86TS 33.54FG 32.93TS 33.18TS 33.26LPTS 32.25HPTS 33.00TS 33.34DISTURBANCE LIMITS, TYP.DISTURBANCE LIMITS, TYP.DISTURBANCE LIMITS, TYP.TS 33.00TS 32.84TS 33.41TS 33.50TS 33.35LPTS 32.00HPTS 33.00ME 31.40ME 31.89ME 31.99TS 33.00TS 33.19ME 32.28ME 29.56ME 29.88TS 32.50TS 33.78ME 32.78ME 32.72ME 32.65ME 32.59ME 32.52ME 32.45TS 33.93TS 33.80TS 32.90TS 32.96TS 32.57ME 32.89LPTS 32.25TS 33.50TS 33.50TS 33.50LPTS 32.25TS 32.97FG 30.45FG 30.45FG 30.45FG 30.45FG 30.45FG 30.45FG 30.45FG 30.45FG 30.45FG 32.63FG 32.80FG 32.93FG 32.93TS 33.50TS 32.50TS 32.50TS 32.50TS 32.50FG 32.00FG 32.00FG 31.75FG 32.00FG 31.75FG 32.00ME 28.27ME 30.92ME 30.30ME 31.43TS 33.50FG 29.90FG 29.90FG 29.90FG 29.90FG 29.90FG 30.47FG 30.84FG 31.14FG 31.27FG 31.36FG 33.35ME 31.84ME 31.91ME 31.27ME 31.33ME 31.42ME 33.44FG 30.45FG 30.45ME 32.99ME 33.05FG 30.45FG 30.45ME 32.55ME 32.54ME 32.51FG 29.90PROPERTY LINE, TYP.SEE 2/C210 FORCROSS SECTIONSEE 1/C210 FORCROSS SECTIONSEE 3/C210 FORCROSS SECTIONSEE 4/C210 FORCROSS SECTIONLPTS 32.00TS 32.33TS 32.33TS 32.50TS 32.50ME 32.47ME 32.03FG 32.00ME 29.17ME 31.67FG 29.00FG 29.00FG 29.00FG 29.00LPTS 33.15TS 33.23TS 33.50TS 33.41TS 33.44PROPOSED FENCEPROPOSED RETAINING WALLSEE C22031 313131 31 32 323232 32 32 33 33 33 33 33333333 33333434 DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C201GRADING PLAN EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Grading Plan.dwg1/17/2023 11:19:49 AM GRADING LEGEND:ME - MATCH EXISTING GRADETC - TOP OF CURB ELEVATIONGU - GUTTER ELEVATIONTS - TOP OF SLAB ELEVATIONTW - ELEVATION AT TOP OF WALLBW - ELEVATION AT BOTTOM OF WALLEG - EXISTING GRADE ELEVATIONFG - FINISHED GRADE ELEVATIONFFE - FINISHED FLOOR ELEVATIONLP - LOW POINTHP - HIGH POINTLEGEND:GRADE BREAKDISTURBANCE LIMITSGENERAL NOTES:1.FINISHED GRADE CONTOURS ARE SHOWN AT1' AND 5' INTERVALS.2.EXISTING GRADE CONTOURS ARE SHOWN AT1' AND 5' INTERVALS.3.FINISHED GRADE IS TO TOP OF PAVEMENTAND TOP OF GRAVEL, UNLESS OTHERWISENOTED.4.CONTRACTOR SHALL COORDINATE WITHOWNER FOR ACCEPTABLE STAGING AREAS.APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023 152025303540451520253035404520+0033.533.032.631.521+0032.432.432.231.1 22+0029.2 28.3 22+4528.2 32.2730.0229.0029.0029.0029.0029.00 29.00 29.00 31.52 BOTTOM OF BASINEL 29.00BOTTOM OF BASINEL 29.00TOP OF SPILLWAYEL 31.75TOP OF BASINEL 32.00EXISTING GRADE, TYP.PROPOSED GRADE, TYP.20253035404520253035404540+0033.032.332.240+7032.131.8733.2033.37 BOTTOM OF BASINEL 30.45BOTTOM OF BASINEL 30.45EXISTING GRADE, TYP.PROPOSED GRADE, TYP.PROPERTY LINE, TYP.BENCH @ 5%152025303540451520253035404510+0032.6 31.4 31.1 30.8 10+8030.8 30.13 29.90 33.87 33.97 BOTTOM OF BASINEL 29.90BOTTOM OF BASINEL 29.90EXISTING GRADE, TYP.PROPOSED GRADE, TYP.152025303540451520253035404530+0031.9 32.6 33.3 32.7 31+0032.0 30.7 29.2 31+6429.2 32.38 29.00 29.00 29.00 29.00 BOTTOM OF BASINEL 29.00BOTTOM OF BASINEL 26.80TOP OF BASINEL 32.00TOP OF BASINEL 30.00TOP OF BASINEL 32.00BOTTOM OF BASINEL 29.00EXISTING GRADE, TYP.PROPOSED GRADE, TYP.PROPERTY LINE, TYP.DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C210BASIN CROSS SECTIONS EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Grading Plan.dwg1/17/2023 11:20:18 AM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/20231BASIN 1 CROSS SECTION (WEST - EAST)3BASIN 2 CROSS SECTION (WEST - EAST)2BASIN 1 CROSS SECTION (SOUTH - NORTH)4BASIN 3 CROSS SECTION (SOUTH - NORTH) 10+0011 + 0 0 11+92.50TS AT TW 32.97TS AT TW 32.50TS AT TW 32.50TS AT TW 32.50TS AT TW 32.50TS AT TW 30.07FG AT BW 32.62FG AT BW 30.30FG AT BW 30.38FG AT BW 30.78FG AT BW 29.72152025303540451520253035404510+0032.3 31.7 30.7 30.3 11+0030.9 30.7 30.3 29.6 11+9329.9 33.02 32.80 32.59 32.50 32.50 32.50 31.84 30.53 PROPOSED GRADE AT TOPOF RETAINING WALLPROPOSED GRADE AT BOTTOMOF RETAINING WALLTS AT TWSTA 11+37.50EL 32.50TS AT TWSTA 10+59.92EL 32.50START OF RETAINING WALLTS AT TWSTA 10+05.23EL 32.97DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C220RETAINING WALL PROFILE EAW IJH PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Retaining Wall.dwg1/17/2023 11:20:45 AM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023GRADING LEGEND:ME - MATCH EXISTING GRADETC - TOP OF CURB ELEVATIONGU - GUTTER ELEVATIONTS - TOP OF SLAB ELEVATIONTW - ELEVATION AT TOP OF WALLBW - ELEVATION AT BOTTOM OF WALLEG - EXISTING GRADE ELEVATIONFG - FINISHED GRADE ELEVATIONFFE - FINISHED FLOOR ELEVATIONLP - LOW POINTHP - HIGH POINTRETAINING WALL NOTES:1.CONTRACTOR TO PROVIDE FINAL RETAININGWALL PLANS DESIGNED BY A LICENSEDENGINEER.1RETAINING WALL PROFILE PBPROPERTY LINE, TYP.PROPERTY LINE, TYP.200' BUFFER FORRIVER, TYP.(FIELD LOCATED)DISTURBANCE LIMITS, TYP.DISTURBANCE LIMITS, TYP.PROPERTY LINE, TYP.WILLOW STREET353531323334 34363630 30 303535 27 28 29 3131 31 32323233333434 30 35 29 3 1323334 EXISTING CONTOUR, TYP.3 0 313 1 32 32 33 33 3231323233333031 30282829313 2 3 2 32 33 3031302 8 28 28 2929 29 303132 3232 33 353 1 3 2 3 3 3 4 303132323233323533343132 3233 3333 3 1 32 33 333333 302931323032 31 30 29 33 33 3329 343131 3: 1 3:1 3:10.00%0.85%0.85%1.10%0.67%1.31%1.29%1.10%1.65%0.85%0.85%0.98%1.24%1.24%1.28%303029313132DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C250EROSION & SEDIMENT CONTROL PLAN EAW JMR PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Erosion Control Plan.dwg1/17/2023 2:46:47 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/20231.EROSION/ SEDIMENTATION CONTROL MEASURES SHOULD BE INSTALLED BEFORE EARTH DISTURBING ACTIVITIES BEGIN AND AREREQUIRED REGARDLESS OF THE TIME OF YEAR. THIS PLAN AND ITS ASSOCIATED REQUIREMENTS FOR THE PERMIT MUST BEIMPLEMENTED DURING WINTER MONTHS AS WELL. ADDITIONAL INSTALLATION/REMOVAL OF STABILIZATION CONTROLS ASSOCIATED WITHSEEDING OUTSIDE THE SEEDING WINDOW ARE INCIDENTAL TO THE PROJECT.2.IT IS THE CONTRACTOR'S RESPONSIBILITY TO CONTROL EROSION/SEDIMENT ON THE SITE AT ALL TIMES. THE CONTROL MEASURESIDENTIFIED ON THE PLAN ARE A MINIMUM. THE CONTRACTOR SHALL PROVIDE ADDITIONAL EROSION/SEDIMENT CONTROL MEASURES ASNECESSARY AND BY CONSTRUCTION PHASE, TO FULFILL THIS REQUIREMENT.3.CONTRACTOR IS REQUIRED TO MAINTAIN SWPPP DOCUMENTATION.4.EXCEPT AS PRECLUDED BY SNOW COVER, THE CONTRACTOR IS REQUIRED TO USE STABILIZATION CONTROLS ON ALL DISTURBED AREASOF THE SITE REGARDLESS OF THE TIME PERIOD BEFORE THEY WILL BE DISTURBED AGAIN. IN THE EVENT THAT CONSTRUCTIONACTIVITY WITHIN A DISTURBED AREA WILL NOT OCCUR FOR A PERIOD OF 14 OR MORE CALENDAR DAYS, THE CONTRACTOR IS REQUIREDTO INSTALL STABILIZATION MEASURES IMMEDIATELY AFTER CONSTRUCTION ACTIVITY CEASED IN THAT AREA.5.THE CONTRACTOR SHALL USE CONTROL MEASURES AS REQUIRED TO KEEP SOILS FROM LEAVING THE SITE.6.CONTRACTOR SHALL IMPLEMENT SITE SPECIFIC BEST MANAGEMENT PRACTICES (BMPS) AS SHOWN AND REQUIRED BY THE SWPPP.ADDITIONAL BEST MANAGEMENT PRACTICES SHALL BE IMPLEMENTED BY THE CONTRACTOR AS DICTATED BY SITE CONDITIONS OR THEPROJECT GOVERNING AUTHORITIES AT NO ADDITIONAL COST TO THE OWNER THROUGHOUT ALL PHASES OF CONSTRUCTION.7.IF AFTER REPEATED FAILURE ON THE PART OF THE CONTRACTOR TO PROPERLY CONTROL SOIL EROSION, SEDIMENT AND/OR POLLUTIONFROM THE PROJECT SITE, THE GOVERNING AUTHORITIES RESERVE THE RIGHT TO EFFECT NECESSARY CORRECTIVE MEASURES ANDCHARGE ANY COSTS TO THE CONTRACTOR.8.ALL BMPS AND CONTROLS SHALL CONFORM TO THE APPLICABLE FEDERAL, STATE, OR LOCAL REQUIREMENTS, STANDARDS, ANDSPECIFICATIONS OR MANUAL OF PRACTICE.9.ALL BMPS AND CONTROLS INSTALLED ON GREEN INFRASTRUCTURE SHALL REMAIN UNTIL STABILIZATION IS APPROVED BY THE OWNER'SREPRESENTATIVE.10.IN THE EVENT THAT SOILS LEAVE THE SITE, CLEANUP OF ALL SURROUNDING ROADS, DRIVES, AND PARKING LOTS SHALL BE PERFORMEDON A DAILY BASIS AT A MINIMUM AND UPON REQUEST BY OWNER'S REPRESENTATIVE AT NO ADDITIONAL COST. PAVEMENT IS TO BESCRAPED OF DEBRIS AND MUD AND BROOMED CLEAN. MUD TRACKS ARE TO BE REMOVED AS THEY ARE CREATED.11.IF DURING CONSTRUCTION OPERATIONS ANY LOOSE MATERIALS ARE DEPOSITED IN THE FLOW LINE OF GUTTERS, DRAINAGESTRUCTURES, OR DITCHES SUCH THAT THE NATURAL FLOW LINE OF WATER IS OBSTRUCTED, THIS LOOSE MATERIAL SHALL BEREMOVED.12.ALL SEDIMENT SHALL BE PREVENTED FROM ENTERING ANY EXISTING STORM DRAINAGE SYSTEMS BY THE USE OF INLET PROTECTION OROTHER APPROVED FUNCTIONAL METHODS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR REMOVING SEDIMENT RESULTING FROMCONSTRUCTION ACTIVITIES ASSOCIATED WITH THIS PROJECT.13.CONSTRUCTION ACCESS POINTS TO THE SITE SHALL BE PROTECTED IN SUCH A WAY AS TO PREVENT TRACKING OF MUD OR SOIL ONTOPUBLIC THOROUGHFARES. ALL SEDIMENT SPILLED, DROPPED, WASHED OR TRACKED ONTO PUBLIC RIGHTS-OF-WAY MUST BE REMOVEDIMMEDIATELY BY THE CONTRACTOR.14.MAINTAIN SILT FENCING AT ALL TIMES IN AN UPRIGHT POSITION. CLEAN SILT FROM FENCING/FILTER SOCKS ON A REGULAR BASIS AS PERTHE STANDARD SPECIFICATIONS. SILT FENCES MUST BE CLEANED OUT WHEN THEY ARE 50% FULL. FILTER SOCKS MUST BE CLEANEDOUT WHEN THEY ARE 33% FULL.15.CONTRACTOR TO LOCATE/RELOCATE FILTER SOCKS AS NECESSARY THROUGHOUT THE PROJECT TO CONTROL EROSION/SEDIMENT.16.REMOVE ALL TEMPORARY EROSION/SEDIMENTATION CONTROLS NOT CALLED OUT TO REMAIN AFTER SITE HAS BEEN STABILIZED ANDAPPROVED BY THE OWNER'S REPRESENTATIVE.17.CONTRACTOR TO USE EXTREME CAUTION WHILE INSTALLING SILT FENCE OR OTHER EROSION CONTROL DEVICES SO AS NOT TO DAMAGEUNDERGROUND UTILITIES.18.WHERE WATER IS PUMPED FROM EXCAVATIONS ON SITE, PROVISIONS SHALL BE MADE TO REMOVE SEDIMENT FROM THE WATER BEFOREIT IS RELEASED INTO THE STORM SEWER SYSTEM. METHODS INCLUDE: SEDIMENT TRAPS, DEWATERING BASINS, AND FILTER BAGS.REFER TO THE EVERSOURCE BEST MANAGEMENT PRACTICES MANUAL FOR MASSACHUSETTS AND CONNECTICUT FOR DETAILS.19.WHERE WATER IS RELEASED FROM A DEWATERING SYSTEM, PRECAUTIONS SHALL BE TAKEN TO ENSURE THAT EROSION GULLIES DONOT FORM. DEWATERING SYSTEMS SHALL BE SURROUNDED BY STRAW BALES. DISCHARGE DEWATERING VOLUMES TO ADJACENT,UNIMPROVED UPLANDS AWAY FROM WETLANDS. DISCHARGE TO STORMWATER CATCH BASINS MAY REQUIRE PERMITS; CONSULT WITHEVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING.20.CONCRETE SLURRY AND DUST FROM SAWCUTTING ACTIVITIES IS PROHIBITED FROM ENTERING THE STORM SEWER SYSTEM. ALL STORMINTAKES LOCATED NEAR SAWCUTTING ACTIVITIES ARE REQUIRED TO BE PROTECTED. SAWCUT SLURRY AND DUST MUST BE CONTAINED,CLEANED UP, AND DISPOSED OF OFF-SITE. A TEMPORARY 8" FILTER SOCK IS REQUIRED.21.SANITARY WASTE DISPOSAL: ALL LOCATIONS OF PORTABLE RESTROOM FACILITIES MUST BE IDENTIFIED ON THE PLAN. IN THE EVENTTHAT PORTABLE RESTROOM FACILITIES ARE USED ON-SITE, THE CONTRACTOR IS REQUIRED TO INSTALL AN 8" FILTER SOCK AROUNDTHE FACILITY TO MINIMIZE THE RADIUS OF THE AFFECTED ZONE IN THE EVENT OF A SPILL. WASTES SHALL BE COLLECTED AND DISPOSEDOF IN COMPLETE COMPLIANCE WITH LOCAL, STATE AND FEDERAL REGULATIONS. PORTABLE RESTROOM FACILITIES MUST NOT BELOCATED NEAR DRAINAGE WAYS. RELOCATE AS REQUIRED FOR CONSTRUCTION.22.POLLUTION AND SPILL PREVENTION PLANNING: POTENTIALLY HAZARDOUS MATERIALS ON THE CONSTRUCTION SITE INCLUDE FUEL,LUBRICANTS, CURING COMPOUNDS, FERTILIZERS, GREASE AND CLEANING SOLVENTS. THE CONTRACTOR STAGING AREA FOR PORTABLERESTROOM FACILITIES, TEMPORARY FUEL TANKS, WASTE CONTAINERS AND OTHER HAZARDOUS CHEMICALS MUST BE PROTECTED BYAN 8" FILTER SOCK AT ALL TIMES. ALL REASONABLE PRECAUTIONS WILL BE TAKEN TO PREVENT SPILLS. ANY SPILLED MATERIAL WILLIMMEDIATELY BE DIRECTED AWAY FROM STORMWATER INTAKES, DETENTION BASINS, OR DRAINAGE WAYS. SPILLED MATERIALS WILL BECLEANED AND, IF NECESSARY, SOIL REMEDIATION PRACTICES WILL BE USED. A RECORD OF SPILLS WILL BE MAINTAINED BY THE PRIMECONTRACTOR. RELOCATE AS REQUIRED FOR CONSTRUCTION.23.CONCRETE, PAINT AND GROUT WASHOUT AREA: THE WASHOUT AREA SHOULD BE AN APPROVED CONCRETE WASHOUT CONTAINER,COLLECTION BAG, OR WASHOUT BOX. IF USING FILTER SOCKS, STACK TWO (2) TALL AND LINE WITH AN IMPERMEABLE PLASTIC LINER.CONTRACTOR TO HAUL OFF ALL WASTE MATERIAL. ALL LOCATIONS OF CONCRETE, PAINT AND GROUT WASHOUT AREAS MUST BEPROVIDED BY THE CONTRACTOR AND IDENTIFIED ON THE PLAN.THE CONTRACTOR IS REQUIRED TO INSTALL A SIGN THAT DESIGNATESTHE WASHOUT AREA. RELOCATE AS REQUIRED FOR CONSTRUCTION.24.SPILL KIT: A SPILL KIT IS REQUIRED TO BE ON-SITE AND LOCATION NOTED ON THE STORMWATER POLLUTION PREVENTION PLAN. THESPILL KIT SHOULD BE DESIGNED TO DEAL WITH ANY HAZARDOUS MATERIALS ON-SITE.THE SPILL KIT SHALL BE A SEALED STORAGE SHEDLOCATED NEAR THE CONSTRUCTION TRAILER OR FUELING AREA. THE SPILL KIT SHALL CONTAIN, BUT NOT BE LIMITED TO THEFOLLOWING ITEMS: A GARBAGE CAN, GLOVES, SAFETY GOGGLES, BROOM AND DUST PAN AND OIL ABSORBENT CLAY CHIPS OR PADS.THE SPILL KIT SHALL BE RESTOCKED AS SUPPLIES ARE USED. THE CONTRACTOR SHALL INSTALL A SIGN THAT DESIGNATES THE SPILLKIT. RELOCATE AS REQUIRED FOR CONSTRUCTION.25.DUST CONTROL: THE CONTRACTOR SHALL MINIMIZE SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES. POSSIBLEDUST CONTROL MEASURES INCLUDE VEGETATIVE COVER, STONE, WATER/SPRINKLING, BARRIERS, PLASTIC COVERINGS, AND CALCIUMCHLORIDE. REFER TO THE EVERSOURCE BEST MANAGEMENT PRACTICES MANUAL FOR MASSACHUSETTS AND CONNECTICUT.26.STOCKPILED MATERIALS: CONTRACTOR TO IDENTIFY ALL LOCATIONS OF STOCKPILED MATERIALS ON THE STORMWATER POLLUTIONPREVENTION PLAN. CONTRACTOR SHALL PROVIDE ALL EROSION/SEDIMENTATION CONTROLS AS REQUIRED TO CONTAIN MATERIALSON-SITE. AT A MINIMUM, THE CONTRACTOR IS REQUIRED TO PROVIDE SILT FENCE/FILTER SOCKS AROUND STOCKPILED SOILS BEFORESTOCKPILE IS RE-SPREAD. IF STOCKPILE SOILS WILL REMAIN INACTIVE FOR 14 DAYS OR MORE, THE CONTRACTOR TO SHALL COVER ORPROVIDE TEMPORARY STABILIZATION CONTROLS.27.SEQUENCE OF MAJOR ACTIVITIES: INCORPORATE ALL TEMPORARY STABILIZING AND PERMANENT EROSION/SEDIMENT CONTROLFEATURES AT THE EARLIEST TIME PRACTICABLE. THE CONTRACTOR SHALL AMEND THE SWPPP WHENEVER THERE IS A CHANGE INDESIGN, CONSTRUCTION, OPERATION OR MAINTENANCE OF A STORMWATER BMP.EROSION AND SEDIMENT CONTROL NOTESTHE EROSION AND SEDIMENT CONTROLS IDENTIFIEDON THIS DRAWING ARE TO BE INSTALLED ASCONSTRUCTION ACTIVITIES ALLOW. ALL TEMPORARYCONTROLS TO REMAIN UNTIL THE SITE HAS BEENSTABILIZED AND APPROVED BY THE OWNER'SREPRESENTATIVE.LEGENDSILT FENCEPROJECT SITE/DISTURBED AREAFINISHED GRADEDIRECTION OF DRAINAGETEMPORARY ROLLED EROSIONCONTROL PRODUCTSTABILIZED CONSTRUCTIONENTRANCE/ EXITCONTRACTOR STAGING AREA FORPORTABLE RESTROOM FACILITIES,TEMPORARY FUEL TANKS, WASTECONTAINERS AND OTHERHAZARDOUS CHEMICALS. RELOCATEAS REQUIRED FOR CONSTRUCTION.SWPPP DOCUMENT LOCATIONSPILL KIT TO BE INSTALLED ANDRELOCATED AS REQUIRED FORCONSTRUCTIONCONCRETE, PAINT, AND GROUTWASHOUT AREA PER SUDASSECT 11,050. CONTRACTOR TOHAUL OFF WASTE MATERIAL.SUGGESTED LOCATION.RELOCATE AS REQUIRED FORCONSTRUCTION.PORTABLE RESTROOMFACILITY LOCATIONTURF REINFORCEMENT MATCONTRACTOR TO DETERMINEPREFERRED LOCATION DURINGEACH PHASE OF CONSTRUCTION.LOCATION TO BE CONFIRMED BYTHE OWNER, TYP.CLEANUP OF DIRT AND DEBRISIS REQUIRED. CONTRACTORSHALL USE ALL METHODSNECESSARY TO PREVENTTRACKING OFF-SITE AT ALLTIMES AND AS REQUIRED BYTHE OWNER. CONTRACTORSHALL ANTICIPATE THE USE OFDUST CONTROL MEASURES.STORE SWPPP DOCUMENTSIN MAILBOX NEAR EDGE OFCONSTRUCTION OR WITHINCONSTRUCTION TRAILER WILLOW STREET N 2709203.20E 994188.91IE = 29.00N 2709250.13E 994214.52IE = 29.00N 2709157.63E 994164.04IE = 29.00N 2709392.53E 993814.26IE = 30.45N 2709239.79E 994208.86IE = 29.00N 2709185.57E 993726.58IE = 30.50N 2709338.09E 993786.70IE = 31.00N 2709452.77E 993849.02IE = 31.00PROPERTY LINE, TYP.PARKING SETBACKLINE, TYP.PROPERTY LINE, TYP.200' BUFFER FORRIVER, TYP.(FIELD LOCATED)CONNECT TO WATER MAINTAPPING SLEEVE & VALVE.SEE NOTE 4 & 5/C30152 LF OF 6" DIPWATER SERVICEFURNISH & INSTALL FIREHYDRANT ASSEMBLY PERYARMOUTH STANDARDSDISTURBANCELIMITS, TYP.DISTURBANCELIMITS, TYP.EXISTING WATER MAIN, TYP.LOCATION SHOWN IS APPROXIMATE.CONTRACTOR TO CONFIRM LOCATIONPRIOR TO CONSTRUCTIONPROPERTY LINE, TYP.ST CB A-2 (48" CATCH BASINSEE DETAILS 6 & 7/C501)N 2709263.15E 993924.04RIM = 32.25IE = 29.69 ST P-A-3 NWIE = 29.69 ST P-A-2 EST CB B-3 (48" CATCH BASIN)N 2709321.91E 993956.10RIM = 32.25IE = 29.81 ST P-B-3 NWIE = 29.81 ST P-B-2 SEST MH C-2 (HYDRODYNAMIC SEPERATORSEE 1/C504OPEN GRATE)N 2709294.51E 994133.19RIM = 32.00IE = 29.26 ST P-C-2 NWIE = 29.26 ST P-C-1 SEST FES C-1 (18 '' RCP FES)ST FES B-1 (18 '' RCP FES)ST MH B-2 (HYDRODYNAMIC SEPARATORSEE 1/C504OPEN GRATE)N 2709247.57E 994107.58RIM = 32.00IE = 29.22 ST P-B-2 NWIE = 29.22 ST P-B-1 SEST FES B-4 (12 '' RCP FES)ST CB E-3 (3' X 3' RECTANGUALR INTAKEW/CONCAVE 2' X 2' INLET FRAME & GRATE)N 2709548.00E 993978.32RIM = 31.43IE = 30.09 ST P-E-3 SWIE = 30.09 ST P-E-2 SWST FES A-5 (12 '' RCP FES)ST MH A-1 (HYDRODYNAMIC SEPARATORSEE 1/C504OPEN GRATE)N 2709202.01E 994082.72RIM = 32.00IE = 29.26 ST P-A-2 WIE = 29.26 ST P-A-4 SWIE = 29.26 ST P-A-1 SEST CB A-4 (48" CATCH BASIN)N 2709167.80E 994064.05RIM = 32.49IE = 29.45 ST P-A-5 WIE = 29.45 ST P-A-4 NEST FES A-1 (18 '' RCP FES)ST CB E-2 (3' X 3' RECTANGULAR INTAKEW/2' X 2' INLET FRAME & GRATE)N 2709400.60E 993914.17RIM = 33.07IE = 29.82 ST P-E-3 NEIE = 29.82 ST P-E-2 NEIE = 29.82 ST P-E-1 SEST FES E-1 (15 '' RCP FES)ST CB C-3 (48" CATCH BASIN)N 2709420.87E 994010.11RIM = 32.25IE = 29.88 ST P-C-2 SEST FES A-3 (12 '' RCP FES)ST MH D-1 (HYDRODYNAMIC SEPARATORSEE 2/C50424" X 24" FRAME AND GRATE)N 2709384.15E 993829.65RIM = 33.15IE = 30.58 ST P-D-1 NWST FES D-1 (15 '' RCP FES)ST P-C-1 85 LF18 '' RCP @ 0.30%ST P-A-2 167 LF15 '' RCP @ 0.25%ST P-B-2 165 LF15 '' RCP @ 0.35%ST P-B-1 85 LF18 '' RCP @ 0.25%ST P-B-3 162 LF12 '' RCP @ 0.73%ST P-E-3 159 LF8 '' PVC @ 0.17%ST P-C-2 173 LF15 '' RCP @ 0.35%ST P-A-5 330 LF12 '' RCP @ 0.32%ST P-A-4 35 LF15 '' RCP @ 0.50%ST P-A-1 85 LF18 '' RCP @ 0.30%ST P-E-2 159 LF8 '' PVC @ 0.17%ST P-E-1 329 LF15 '' RCP @ 0.25%ST P-A-3 149 LF12 '' RCP @ 0.87%ST P-D-1 10 LF15 '' RCP @ 0.68%DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C301UTILITY PLAN EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Utility Plan.dwg1/18/2023 4:53:34 PM GENERAL NOTES:1.ALL UTILITIES SHOWN ARE APPROXIMATE.CONTRACTOR TO CONFIRM THE HORIZONTAL ANDVERTICAL LOCATION OF UTILITIES IN PROJECT AREA.CONTRACTOR TO INFORM ENGINEER OF ANYPOTENTIAL CONFLICTS OR DIFFERENCES BETWEENPLANS AND WHAT IS CONFIRMED IN THE FIELD PRIORTO CONSTRUCTION.2.PIPE FITTINGS, TEES, WYES, AND BENDS MAY NOT BECALLED OUT IN EVERY LOCATION AND ARE INCIDENTALTO CONSTRUCTION. CONTRACTOR IS RESPONSIBLE TOPROVIDE THE NECESSARY SCHEDULE AND MATERIALSFOR THESE ITEMS.3.ALL CATCH BASINS ARE TO HAVE 4' MINIMUM SUMP.4.CONTRACTOR SHALL RESTORE ALL EXISTING AREASAND ROADWAYS TO THEIR INITIAL CONDITION WHEREDISTURBED BY UTILITY INSTALLATIONS.5.CONTRACTOR TO FOLLOW ALL APPLICABLE TRAFFICCONTROL AND SAFETY WHEN WORKING WITHIN THESTREET RIGHT OF WAY.6.HYDRANT INSTALLATION SHALL BE COORDINATED WITHTHE YARMOUTH WATER DEPARTMENT. MATERIALS ANDINSTALLATION SHALL CONFORM TO YARMOUTH WATERDEPARTMENT WATER MATERIALS AND INSTALLATIONSTANDARDS.APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023 WILLOW STREET0+000+3010.0'PROPERTY LINE, TYP.PROPERTY LINE, TYP.30' PARKING FRONTYARD SETBACK10' PARKING REARYARD SETBACKPROP. STORMWATERMANAGEMENT AREAEXTERIOR FENCEEXIST. STORAGEPROP. DRIVEWAY ENTRANCE200' BUFFER FORRIVER, TYP.DISTURBANCE LIMITS, TYP.PLANTING BED BOUND BYSPADE CUT EDGEPLANTING BED BOUND BYSPADE CUT EDGEPLANTING BED BOUND BYSPADE CUT EDGEPLANTING BED BOUND BYSPADE CUT EDGEPLANTING BED BOUND BYPAVEMENTRIVER ROCK BED AT FENCE ANDFENCE GATESRIVER ROCK BED AT FENCE ANDFENCE GATESPROTECT EXISTING TREESEXISTING TREE LINE TO BE PROTECTEDAS LANDSCAPE BUFFERPLANTING BED WITH DECEDIOUSTREES AND EVERGREEN TREESALONG FENCE IN BUFFERYARD.TREE PLANTINGS ATDETENTION AREAPLANTING BED WITH DECEDIOUSTREES AND EVERGREEN TREESALONG FENCE IN BUFFERYARD.RETAINING WALLTREESCODEQTYBOTANICAL NAMECOMMON NAMEROOTSIZEACE SA29Acer SaccharumSugar MapleB & B3"CalBET RIV16Betula nigraRiver BirchB & B3"CalCAR AME16Carpinus carolinianaAmerican HornbeamB & B3"CalNYS SYL8Nyssa sylvaticaBlack TupeloB & B3"CalQUE BIC16Quercus bicolorSwamp White OakB & B3"CalEVERGREEN TREESCODEQTYBOTANICAL NAMECOMMON NAMEROOTSIZETHU IBI20Thuja x 'Green Giant'Green Giant ArborvitaeB & B7-8` HTSHRUBSCODEQTYBOTANICAL NAMECOMMON NAMEROOTSIZEKAL LAT45Kalmia latifoliaMountain Laurel3 gal24 - 30" HtVIB DEN39Viburnum dentatumArrowwood Viburnum3 gal30 - 36" Ht.ORNAMENTAL GRASSCODEQTYBOTANICAL NAMECOMMON NAMEROOTSIZECAL KAR80Calamagrostis x acutiflora 'Karl Foerster'Karl Foerster Feather Reed Grass3 gal24 - 30" HtPAN VIR57Panicum virgatumSwitch Grass2 gal24 - 30" HtSPO TAR246Sporobolus heterolepis 'Tara'Tara Prairie Dropseed3 gal12 - 18" Ht.PLANT SCHEDULEDRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C401LANDSCAPE PLAN SLB EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Landscape Plan.dwg1/18/2023 5:08:41 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023LEGENDDISTURBANCELIMITSTURF GRASSSEED MIXRIVER ROCKBED RIVERROCK 3" DEPTHW/ BARRIERFABRIC1.PROTECT ALL EXISTING AND NEW STRUCTURES AND UTILITYSERVICES DURING INSTALLATION OF ALL PLANT MATERIAL. IFCONFLICTS EXIST BETWEEN PROPOSED PLANTING LOCATIONSAND OTHER STRUCTURES AND UTILITIES, CONTRACTOR SHALLCOORDINATE PLANTING ADJUSTMENTS WITH LANDSCAPEARCHITECT PRIOR TO INSTALLATION.2.ALL PLANTING WORK SHALL BE COORDINATED WITH THE WORKOF OTHER TRADES ON SITE.3.LANDSCAPE CONTRACTOR IS REQUIRED TO MAINTAIN POSITIVEDRAINAGE ON THE SITE FOLLOWING ACCEPTANCE OF GRADINGCONDITIONS. REFER TO GRADING PLAN FOR CONTOURS ANDSPOT ELEVATIONS.4.SITE CLEAN-UP SHALL BE PERFORMED ON A DAILY BASIS. SIDEWALKS, PARKING LOTS, ROADWAYS, ETC. SHALL BE KEPTCLEAN AT ALL TIMES.5.EXCESS AND WASTE MATERIALS SHALL BE DISPOSED OFF-SITEIN ACCORDANCE WITH APPLICABLE GOVERNMENTALREGULATIONS.6.CONTRACTOR IS RESPONSIBLE FOR ALL DAMAGE DUE TOOPERATIONS INSIDE AND OUTSIDE OF THE CONTRACT LIMITLINE. ANY AREAS OUTSIDE THE LIMIT OF WORK THAT AREDISTURBED SHALL BE RESTORED TO ITS ORIGINAL CONDITIONAT NO ADDITIONAL COST TO THE OWNER.7.ALL TREES, SHRUBS, AND PERENNIAL PLANTS ARE LISTED INTHIS PLANT SCHEDULE. IF DISCREPANCIES EXIST BETWEENQUANTITIES SHOWN ON THE DRAWINGS AND QUANTITIESLISTED IN THE PLANT SCHEDULE, THE PLAN QUANTITIES SHALLPREVAIL.8.PLANT LOCATIONS SHOWN ON PLANS ARE REPRESENTATIONALONLY. FIELD ADJUSTMENTS OF PROPOSED PLANT LOCATIONSMAY BE REQUIRED TO MINIMIZE POTENTIAL INTERFERENCEWITH EXISTING UTILITIES, TO MINIMIZE HAZARDS TO PLANTGROWTH AND TO IMPROVE MAINTENANCE CONDITIONS. PLANTLOCATIONS SHALL BE APPROVED BY THE OWNER'SREPRESENTATIVE PRIOR TO PLANT MATERIAL INSTALLATION.9.ALL PLANT MATERIALS MUST CONFORM TO AMERICANSTANDARDS FOR NURSERY STOCK (A.S.N.S.), LATEST EDITIONPUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN,WASHINGTON D.C. LARGER SIZED PLANT MATERIALS OF THESPECIES LISTED MAY BE USED IF THE STOCK CONFORMS TOTHE A.S.N.S.10.ALL LANDSCAPE ON SITE SHALL BE PER CITY CODE LANDSCAPEREQUIREMENTS,11.ANY PROPOSED SUBSTITUTIONS OF PLANT SPECIES SHALL BEMADE WITH PLANTS OF EQUIVALENT OVERALL FORM, HEIGHT,BRANCHING HABIT, FLOWER, LEAF, COLOR, FRUIT ANDCULTURE, AND ONLY AFTER WRITTEN APPROVAL OF THELANDSCAPE ARCHITECT.12.THE CONTRACTOR SHALL SUBMIT DOCUMENTATION VERIFYINGSEED LABEL AND PLANT CULTURE, SIZE, AND CONDITION, ASWELL AS NURSERY CERTIFICATION TO LANDSCAPE ARCHITECTFOR APPROVAL PRIOR TO INSTALLATION. THE OWNER AND/ORLANDSCAPE ARCHITECT RESERVE THE RIGHT TO REJECTPLANTS THAT DO NOT CONFORM TO PROJECT SPECIFICATIONSAND ANSI STANDARDS UPON DELIVERY TO THE SITE.13.ALL PLANT MATERIALS SHALL BE PLANTED WITHIN 48 HOURS OFARRIVAL ONSITE.14.THE CONTRACTOR SHALL REMOVE ALL CONSTRUCTION DEBRISAND MATERIALS INJURIOUS TO PLANT GROWTH FROM PLANTINGPITS AND BEDS PRIOR TO BACKFILLING WITH PLANTING SOILMIX.15.ALL PLANTING BEDS SHALL RECEIVE 12" DEPTH IMPORTEDPLANTING SOIL MIX.16.PROVIDE A SPADE-CUT EDGE AT THE PERIMETER OF ALLMULCHED PLANTING BEDS UNLESS OTHERWISE NOTED, SEEDETAIL.17.STEEL EDGING SHALL BE PROVIDED AT ROCK BED AND FENCELINE BED. EDGING SHALL BE SURE-LOC BLACK COATED STEELEDGING SIZED 1/8" X 4" X 16'. OR APPROVED EQUIVALENT.18.APPLY PRE-EMERGENT WEED PREVENTER TO PLANTING AREASPRIOR TO MULCHING. TOP-DRESS PLANTING AREAS WITHDOUBLE-SHREDDED HARDWOOD MULCH TO A DEPTH OF 3".19.SEED ALL DISTURBED AREAS UNLESS OTHERWISE NOTED.SEEDMIX SHALL BE PER MASSACHUSETTS DOT SPECIFICATIONS ANDSHALL BE IN ACCORDANCE WITH APPROPRIATE SEEDING DATESAND SHALL BE MIX SPECIFIED UNLESS OTHER WISE APPROVED.20.ALL SOD AREAS SHALL RECEIVE A MINIMUM 8" DEPTH OFTOPSOIL. TILL TOPSOIL INTO IN-SITU SOILS TO A DEPTH OF 4".21.ALL PLANT MATERIAL SHALL BE GUARANTEED TO BE IN A LIVEAND HEALTHY GROWING CONDITION FOR TWO FULL GROWINGSEASONS (TWO YEARS) AFTER FINAL PROJECT ACCEPTANCEOR SHALL BE REPLACED FREE OF CHARGE, BY CONTRACTOR,WITH THE SAME GRADE AND SPECIES.22.EXISTING TREE PLANTING SHALL BE PROTECTED IN ALL AREASAS REQUIRED. UNLESS OTHERWISE NOTED OR APPROVED BYTHE OWNER OR OWNERS REPRESENTATIVE.23.ANY EXISTING TREE PLANTINGS THAT ARE UNABLE TO BEPROTECTED SHALL BE DISCLOSED TO THE OWNER OR OWNERSREPRESENTATIVE PRIOR TO ANY REMOVALS. AREAS THATEXISTING TREES CALLED TO BE PRESERVED AND CANNOT BESHALL HAVE NEW TREES AND SHRUBS PLANTED IN AREAS ASAPPROVED BY OWNER OR OWNERS REPRESENTATIVE. TREES INLOCATIONS NOT ABLE TO BE PRESERVED SHALL BELANDSCAPE NOTESSTEELEDGINGXSE MA UPLANDRESTORATIONSEED MIXPLANT BEDWITH 3"SHREDDEDHARDWOODMULCH DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C402LANDSCAPE DETAILS SLB EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Landscape Details.dwg1/18/2023 5:09:53 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023TYPICAL SPADE EDGE AND MULCH DETAILFIN. GRADE/TURFSUBGRADESPADE CUT EDGEMINIMUM 6" DEPTH MULCH MATERIAL VARIES,73"5"2' MIN.SEE PLANS(2) PARTIALLY BACKFILL PLANTING HOLE TO STABILIZE TREE.(1) CAREFULLY CUT AND REMOVE BOTTOM OFWIRE CAGE BEFORE PLACING IN PLANTING HOLE.(3) COMPLETELY REMOVE REMAINING WIRE CAGE ANDREMOVE THE TOP 2/3 OF TWINE, BURLAP, AND PACKAGINGBEFORE PLACING PLANTING SOIL.(4) COMPLETE BACKFILL PER APPLICABLE DETAIL.PLANTING NOTE:DURING ESTABLISHMENT PERIOD THE CONTRACTORSHALL PROVIDE WEEDING, ADJUSTMENT OF STAKES,REPAIR OF WATER SAUCERS AND WORK NECESSARYTO MAINTAIN PLANTS. WORK SHALL BE INCIDENTALTO COST OF PLANTS.2 X ROOT BALL DIAMETERPLACE ROOTBALL ON UNEXCAVATED OR TAMPED SOIL.TAMP SOIL AROUND ROOT BALL BASE FIRMLY WITHFOOT PRESSURE SO THAT ROOT BALL DOES NOT SHIFT.ROOT BALL CROWN2" ABOVE GRADESET ROOT BALL CROWN 2" HIGHER THANGRADE. EACH TREE MUST BE PLANTEDSUCH THAT THE TRUNK FLARE IS VISIBLE ATTHE TOP OF THE ROOT BALL.SCARIFY THE SIDES AND BOTTOM OF THE HOLE BEFOREPLACING THE TREE IN THE PLANTING HOLE. BACKFILLHOLE WITH PLANTING SOIL.SET TREE PLUMB AND MAINTAIN THROUGHOUT WARRANTY.REMOVE ALL FLAGGING AND LABELS AFTER LANDSCAPEARCHITECT APPROVAL.6" LONG POLYROPYLENE OR POLYETHYLENE, 40 MIL.THICK AND 1.5" WIDE STRAPS. ATTACH WITH 10 ga WIRE.6'-0"NOTES:1. STEEL POSTS TO BE NOTCHED OR DRILLED TO RETAINWIRES. PLACE OUTSIDE OF PLANTING HOLE. DRIVE PLUMBREGARDLESS OF GROUND SLOPE.3. TREE STAKING IS REQUIRED FOR ALL DECIDUOUS TREES2.0" CAL. OR LARGER. USE 3 STAKES.4. TREE STAKING IS REQUIRED FOR ALL EVERGREEN TREES.USE 2 STAKES.4. REMOVE AT THE END OF 1 YEAR.STEEL POST, SEE CHART.STEEL POST SIZINGCALIPERSTEEL POST TYPEABCLESS THAN4 INCHESROLLED STEEL FENCEPOST2'-0"MIN4'-0"MINA CB PLAN VIEWDECIDUOUS TREE 2.0" CAL. STAKING ORIENTATION PLANOR LARGERPLACE STAKES 6" BEYOND TREE'S DRIPLINE6'-0" MULCH RINGSPADE CUT EDGE3" DEPTH DOUBLE SHREDDED HARDWOOD MULCHRING PULLED BACK 6" FROM TRUNK BASE. TAPERTOP OF MULCH TO TURF LINE. PROVIDE WEEDINGTHROUGH CONTRACT PERIOD.NORTHPLANTINGS AS SPECIFIED IN C400PLANTING PLANPLANTINGS AS SPECIFIED IN C400PLANTING PLANTREE STAKING ROOTBALL INSTALLATIONDECIDUOUS TREE PLANTING923PERENNIAL PLANTING LAYOUT8SET TREE PLUMB AND MAINTAIN THROUGHOUT WARRANTY.REMOVE ALL FLAGGING AND LABELS AFTER LANDSCAPEARCHITECT APPROVAL.PLACE ROOTBALL ON UNEXCAVATED OR TAMPED SOIL.DURING THE SPRING PLANTING SEASON, ANY EVERGREEN PLANTDELIVERED WITH NEW GROWTH IN ADVANCE STAGE OFCANDLING OUT WILL BE REJECTED. EVERGREEN TREES NOTFULLY BRANCHED FROM BOTTOM TO TOP WILL BE REJECTEDAND THOSE WITH TERMINAL LEADERS EXCEEDING 12" IN LENGTHWILL ALSO BE REJECTED.ROOT BALL CROWN2" ABOVE GRADE2 X ROOT BALL DIAMETERPLACE STAKES 6" BEYOND TREE'S DRIPLINESET ROOT BALL CROWN 2" HIGHER THANGRADE. EACH TREE MUST BE PLANTEDSUCH THAT THE TRUNK FLARE IS VISIBLE ATTHE TOP OF THE ROOT BALL.TAMP SOIL AROUND ROOT BALL BASEFIRMLY WITH FOOT PRESSURE SO THATROOT BALL DOES NOT SHIFT.3" DEPTH DOUBLE SHREDDED HARDWOODMULCH RING PULLED BACK 6" FROM TRUNKBASESCARIFY THE SIDES AND BOTTOM OF THE HOLE BEFOREPLACING THE TREE IN THE PLANTING HOLE. BACKFILL HOLEWITH PLANTING SOIL.MULCH RING SHOULD EXTEND 6" BEYONDTREE STAKES. TAPER TOP OF MULCH TO MATCHTURF LINE. PROVIDE WEEDING THROUGH CONTRACT PERIOD.CONIFEROUS TREE PLANTING1SPACING INDICATED IN PLANT SCHEDULE EQUALEQUALSPACING INDICATEDIN PLANT SCHEDULEPERENNIALPLANT, TYP.PLANTING AND PLANTING BED EDGING ASSPECIFIED IN C00 PLANTING PLANELEVATIONPLANEXISTING TREETREE PROTECTION DETAIL4'-0" HIGH ORANGECONSTRUCTION FENCE WITH 2X4TOP RAIL. STEEL FENCE POSTSAT 6'-0" OC MINIMUM (AT DRIPLINEAROUND TREES)TYPICAL ALL TREESINSIDE WORK AREACOMPACT GRADES ADJACENT TO EDGINGTO AVOID SETTLING. STAKES SPACED PER MANUFACTURER RECOMMENDATIONSBED MEDIA OR AGGREGATE PER LANDSCAPE PLAN.TOP OF EDGING TO BE MAXIMUM OF 12"ABOVE SURFACE MATERIAL.INSTALL PER MANUFACTURER'S SPECIFICATIONS.AT CORNERS, CUT BASE OF EDGING UP HALFWAYAND FORM A CONTINUOUS CORNER.SURE-LOC BLACK POWDER COATED STEEL EDGING1/8" X 4" X 16'6METAL EDGING 10GRANULAR ROCK MULCH - LANDSCAPE FABRICCOMPACTED SUBGRADE5ROCK MULCH-RIVER DOCK 3" DEPTH3"NOTE: AREAS INDICATED TORECIEVE GRANULAR ROCK MULCHSHALL BE BOUND BY ALUMINUMEDGING OR PAVEMENT.DIG HOLE 2X ROOT BALL DIA. SCARIFY THE SIDES ANDBOTTOM OF THE HOLE BEFORE PLACING THE PLANT INTHE PLANTING HOLE. BACKFILL WITH PLANTING SOIL.CONSTRUCT 3" HIGH EARTHSAUCER BEYOND EDGE OF ROOTBALL AND WATER THOROUGHLYWITHIN 2 HOURS.SPACE PLANTINGS ACCORDING TO PLANSIF PLANT IS SHIPPED WITH ACONTAINER AROUND THEROOTBALL, SLICE SIDES OFCONTAINER AND REMOVECOMPLETELY. USE FINGERSOR SMALL HAND TOOLS TOPULL ROOTS OUT OF THEOUTER LAYER OF POTTINGSOIL, CUT OR PULL APARTANY CIRCLING ROOTS.REMOVE ALL ROPE, TWINEAND BURLAP FROM ROOTBALL OF B&B SHRUBSSET ROOT FLARE AT GRADE.PLANTING SOIL ASSPECIFIED.PLANTING AND PLANTING BED EDGING ASSPECIFIED IN C00 PLANTING PLAN3" DEPTH OF DOUBLE SHREDDED HARDWOOD MULCH FORPLANTING BED. DO NOT PLACE MULCH IN CONTACT WITHCROWN, MAINTAIN A MIN. 3" DIA. MULCH FREE RINGAROUND CROWN. PROVIDE WEEDING THROUGHCONTRACT PERIOD.PLANTING AND PLANTING BEDEDGING AS SPECIFIEDIN C400 PLANTING PLANSHRUB AND PERENNIAL PLANTING AND EDGING4EXISTING CONDITIONS PHOTOSEX1 DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C501CIVIL DETAILS EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Construction Details.dwg1/18/2023 4:48:25 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/20231AACC SECTION3.5"8.0"14.0"COMPACTED SUBGRADE.CONTRACTOR TO REMOVEALL UNSUITABLESUBGRADE AND REPLACEWITH SUITABLESTRUCTURAL FILL ASREQUIRED.2.5"TACK COAT (0.10 GALLONPER SQUARE YARD)PRIME COAT (0.35 GALLONPER SQUARE YARD)RIGID PIPE TRENCH12" COMPACTEDPROCESSED AGGREGATEBASE (PER MASS SSM2.01.07)3TYPICAL WATER CONNNECTION W/ TAPPING SLEEVE & VALVEBITUMINOUS CONCRETESURFACE COURSE(PER MASS SS M3.11)BITUMINOUS CONCRETEBINDER COURSE(PER MASS SS M3.11)26STORM CATCH BASIN20"48"FLARED END SECTIONCONCRETE FOOTING#3 BARS AROUNDHORIZ BARS AT 12" OC(6) #5 HORIZ BARSFLARED END SECTION FOOTINGFLARED END SECTION FOOTING4REINFORCED CONCRETE PIPE FLARED END95OPEN LID INLET FRAME & GRATE6RECTANGULAR STORM INTAKE DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C502CIVIL DETAILS EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Construction Details.dwg1/18/2023 4:47:50 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/2023STABILIZED CONSTRUCTION ENTRANCE41. CONCRETE WASHOUT AREA SHALL BE INSTALLED PRIOR TO ANY CONCRETEPLACEMENT ON SITE.2. SIGNS SHALL BE PLACED AT THE CONSTRUCTION ENTRANCE, AT THEWASHOUT AREA, AND ELSEWHERE AS NECESSARY TO CLEARLY INDICATE THELOCATION OF THE CONCRETE WASHOUT AREA TO OPERATORS OF CONCRETETRUCKS AND PUMP RIGS.3. THE CONCRETE WASHOUT AREA SHALL BE REPAIRED AND ENLARGED ORCLEANED OUT AS NECESSARY TO MAINTAIN CAPACITY FOR WASTED CONCRETE.4. AT THE END OF CONSTRUCTION, ALL CONCRETE SHALL BE REMOVED FROMTHE SITE AND DISPOSED OF AT AN ACCEPTED WASTE SITE.5. WHEN THE CONCRETE WASHOUT AREA IS REMOVED, THE DISTURBED AREASHALL BE SEEDED AND MULCHED OR OTHERWISE STABILIZED IN A MANNERACCEPTED BY THE CITY.6. PROVIDE A DOUBLE THICKNESS OF IMPERMEABLE PLASTIC LINER WITH AMINIMUM THICKNESS OF 10 MIL PER SHEETCONCRETE WASHOUT DETAIL7NOTES:SIGN TO INDICATE THELOCATION OF THECONCRETE WASHOUT AREAGROUND SURFACE12"2' MIN BERM OR FILTER SOCK AROUND PERIMETER12"COMPACTED EMBANKMENT MATERIALOR FILTER SOCK, TYP.3H:1V OR FLATTERSIDE SLOPES8'X8' MINOR AS REQ. TO CONTAINWASTE CONCRETEFLOWENGINEERING FABRIC TO BE FOLDED ACROSS BOTTOM OFTRENCH.ENGINEERING FABRIC SHALL HAVE A MINIMUM 36" WIDTH.SECURE TOP OF ENGINEERING FABRIC TO STEEL POST.FOR TRENCH INSTALLATION, POSTS SHALL BE EMBEDDED 28"BELOW THE TRENCH BOTTOM. ALL COMPACTION SHALL BEACCOMPLISHED WITH A MECHANICAL OR PNEUMATIC TAMPER.FOR MACHINE INSTALLATION, POSTS SHALL BE EMBEDDED 28"BELOW GROUND LINE. ALL COMPACTION SHALL BE ACCOMPLISHEDBY DRIVING OVER EACH SIDE OF SILT FENCE 2-4 TIMES WITHDEVICE EXERTING 60PSI OR GREATER.GENERAL NOTES:TYPICAL SECTION SILT FENCEDETAILS OF SILT FENCEGROUND LINEENGINEERINGFABRICTRENCHBOTTOM31" MIN12"EMBED19"8' SPACING MAX.POST TOP VIEWNOTE:TWIST CORD AND PLACE AROUNDPOST, SECURE WITH WIRE.WIRECORDPOSTCORDFABRICWIREPOSTFRONT VIEW"T" STEELFENCE POST5'-0" MIN 10" MINFORESLOPEGROUND LINE12" MIN DEPTH BY 4"MIN WIDTH TRENCHENGINEERING FABRIC TOBE FOLDED ACROSSBOTTOM OF TRENCHDOUBLE LAYER THICKNESS PLASTIC LINER8INTAKE PROTECTION BAG DETAIL WITH CURB FILTER6SILT FENCE DETAILLIFT STRAPS USED FOREASY MOVEMENT ANDINSPECTION OF UNIT, (TYP)OVERFLOW GAPCURB INTALKCURB FILTERINTAKE PROTECTION BAGEROSION CONTROL BLANKET5SF SFSFSF DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C503CIVIL DETAILS EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Construction Details.dwg1/18/2023 4:46:46 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/20231BLACK-COATED FENCE FABRIC, POST, AND GATE DETAILSFENCE AND GATE NOTES:1.CONTRACTOR TO SUPPLY SHOP DRAWINGPRIOR TO CONSTRUCTION.2.FENCE AND GATE TO HAVE (3) STRANDSOF BARBED WIRE.3.ALL VINYL COATED FENCE MATERIALS(FRAMEWORK, FENCE FABRIC, FITTINGS,TENSION WIRES, ETC.) SHALL BE BLACKPER TOWN REQUIREMENT. DRAWN BY APPROVED BY ISSUED FOR ISSUE DATE FIELD BOOK: PROJECT NUMBER Printed:C504CIVIL DETAILS EAW EAW PERMIT 01/19/2023 3172201210 --- YARMOUTH ERP EVERSOURCE ENERGY, INC. 484 WILLOW STREET, YARMOUTH, MA 02673 P:\Projects\CH\3172201210\Deliverables\Drawings\1_Civil\Construction Details.dwg1/18/2023 4:45:45 PM APRELIMINARY - NOT FOR CONSTRUCTION 12341234BCDEFABCDEF440 NORTH WELLS STREET, SUITE 320 CHICAGO, ILLINOIS 60654 312.324.5500 | SHIVE-HATTERY.COMEMILY WILLIAMSON, PE 57865 01/19/20231HYDRODYNAMIC SEPARATOR DETAIL FOR ST MH A-1, ST MH B-2, AND ST MH C-22HYDRODYNAMIC SEPARATOR DETAIL FOR ST MH D-1 APPENDIX B 2022 Construction General Permit The 2022 Construction General Permit including all Appendices can be found at the following URL: https://www.epa.gov/npdes/2022-construction-general-permit-cgp#2022cgp APPENDIX C First Name Middle Initial Last Name:James Clancy First Name Middle Initial Last Name:Amanda Houle Submission of this Notice of Intent (NOI) constitutes notice that the operator identified in Section III of this form requests authorization to discharge pursuant to the NPDES Construction General Permit (CGP) permit number identified in Section II of this form. Submission of this NOI also constitutes notice that the operator identified in Section III of this form meets the eligibility requirements of Part 1.1 CGP for the project identified in Section IV of this form. Permit coverage is required prior to commencement of construction activity until you are eligible to terminate coverage as detailed in Part 8 of the CGP. To obtain authorization, you must submit a complete and accurate NOI form. Discharges are not authorized if your NOI is incomplete or inaccurate or if you were never eligible for permit coverage. Refer to the instructions at the end of this form. Permit Information This form has not yet been certified. Operator Information Operator Information Operator Point of Contact Information NOI Preparer Information Project/Site Information Project/Site Address NPDES FORM 3510-9 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, DC 20460 NOTICE OF INTENT (NOI) FOR THE 2022 NPDES CONSTRUCTION PERMIT FORM Approved OMB No. 2040-0305  NPDES ID: State/Territory to which your project/site is discharging:MA Is your project/site located on federally recognized Indian Country lands? No Are you requesting coverage under this NOI as a "Federal Operator" or a "Federal Facility" as defined in Appendix A (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-a-definitions.pdf)? No Have stormwater discharges from your current construction site been covered previously under an NPDES permit? No Will you use polymers, flocculants, or other treatment chemicals at your construction site? No Has a Stormwater Pollution Prevention Plan (SWPPP) been prepared in advance of filling this NOI, as required? Yes Are you able to demonstrate that you meet one of the criteria listed in Appendix D (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-d-endangered-species-protection.pdf) with respect to protection of threatened or endangered species listed under the Endangered Species Act (ESA) and federally designated critical habitat? Yes Have you completed the screening process in Appendix E (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf) relating to the protection of historic properties? Yes Indicating "Yes" below, I confirm that I understand that CGP only authorized the allowable stormwater discharges in Part 1.2.1 and the allowable non-stormwater discharges listed in Part 1.2.2. Any discharges not expressly authorized in this permit cannot become authorized or shielded from liability under CWA section 402(k) by disclosure to EPA, state or local authorities after issuance of this permit via any means, Including the Notice of Intent (NOI) to be covered by the permit, the Stormwater Pollution Prevention Plan (SWPPP), during an Inspection, etc. If any discharges requiring NPDES permit coverage other than the allowable stormwater and non-stormwater discharges listed in Parts 1.2.1 and 1.2.2 will be discharged, they must be covered under another NPDES permit. Yes  Operator Name:Eversource Energy Operator Mailing Address: Address Line 1:247 Station Drive Address Line 2:City:Westwood ZIP/Postal Code:02090 State:MA County or Similar Division:Norfolk Country:US Title:Associate Environmental Specialist Phone:781-441-8159 Ext.: Email:james.clancy@eversource.com  This NOI is being prepared by someone other than the certifier. Organization: Phone:508-304-6354 Ext.: Email:AJHoule@tighebond.com  Project/Site Name:Yarmouth ERP Staging Yard Address Line 1:484 Willow Street Address Line 2:City:Yarmouth ZIP/Postal Code:02673 State:MA County or Similar Division:Barnstable Successfully saved your form × First Name Middle Initial Last Name:Amanda Houle Discharge Information Stormwater Pollution Prevention Plan (SWPPP) Endangered Species Protection Worksheet: Criterion C Determine ESA Eligibility Criterion Are your discharges and discharge-related activities already addressed in another operator's valid certification of eligibility for your "action area" under the current 2022 CGP? No Has consultation between you, a Federal Agency, and the USFWS and/or the NMFS under section 7 of the Endangered Species Act (ESA) concluded? No Are your construction activities the subject of a permit under section 10 of the ESA by the USFWS and/or NMFS, and this authorization addresses the effects of your site's discharges and discharge-related activities on ESA-listed species and/or designated critical habitat? No You must determine whether species listed as either threatened or endangered, or their critical habitat(s) are located in your site's action area (i.e., all areas to be affected directly or indirectly by the federal action and not merely the immediate area involved in the action, including areas beyond the footprint of the site that are likely to be affected by stormwater discharges, discharge-related activities, and authorized non-stormwater discharges). Determine your Action Area You must consider the following in determining the action area for your site, and confirm that all the following are true: Latitude/Longitude:41.675882°N, 70.263276°W Latitude/Longitude Data Source:Map Horizontal Reference Datum:WGS 84 Project Start Date: 02/20/2023 Project End Date: 08/31/2023 Estimated Area to be Disturbed:4 Types of Construction Sites: Utility Will there be demolition of any structure built or renovated before January 1, 1980? No Will you be discharging dewatering water from your site? No Was the pre-development land use used for agriculture? No Are there other operators that are covered under this permit for the same project site? No Have earth-disturbing activities commenced on your project/site? No Is your project/site located on federally recognized Indian Country lands? No Is your project/site located on a property of religious or cultural significance to an Indian tribe? No  Does your project/site discharge stormwater into a Municipal Separate Storm Sewer System (MS4)? No Are there any waters of the U.S. within 50 feet of your project's earth disturbances? No Are any of the waters of the U.S. to which you discharge designated by the state or tribal authority under its antidegradation policy as a Tier 2 (or Tier 2.5) water (water quality exceeds levels necessary to support propagation of fish, shellfish, and wildlife and recreation in and on the water) or as a Tier 3 water (Outstanding National Resource Water)? See Resources, Tools and Templates (https://www.epa.gov/npdes/construction- general-permit-resources-tools-and-templates) Yes 001: Unnamed tributary Unnamed tributary Latitude/Longitude:41.675156°N, 70.261353°W Tier Designation: Tier 2 Is this receiving water impaired (on the CWA 303(d) list)? No Has a TMDL been completed for this receiving waterbody? No  Will all required personnel, including those conducting inspections at your site, meet the training requirements in Part 6 of this permit? Yes Title:Senior Environmental Scientist Phone:508-304-6354 Ext.: Email:AJHoule@tighebond.com  In determining my "action area", I have considered that discharges of pollutants into downstream areas can expand the action area well beyond the footprint of my site and the discharge point(s). I have taken into account the controls I will be implementing to minimize pollutants and the receiving waterbody characteristics (e.g., perennial, intermittent, ephemeral) in determining the extent of physical, chemical, and/or biotic effects of the discharges. I confirm that all receiving waterbodies that could receive pollutants from my site are included in my action area. True In determining my "action area", I have considered that discharge-related activities must also be accounted for in determining my action area. I understand that discharge-related activities are any activities that cause, contribute to, or result in stormwater and authorized non-stormwater point source discharges, and measures such as the siting, construction timing, and operation of stormwater controls to control, reduce, or prevent pollutants from being discharged. I understand that any new or modified stormwater controls that will have noise or other similar effects, and any disturbances associated with construction of controls, are part of my action area. True Successfully saved your form Determine is ESA-listed species and/or critical habitat are in your site action area. ESA-listed species and designated critical habitat are under the purview of the NMFS and the USFWS, and in many cases, you will need to acquire species and critical habitat lists from both federal agencies. National Marine Fisheries Service (NMFS) For NMFS species and designated critical habitat information, use the following webpage: https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility (https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility) U.S. Fish and Wildlife Service (USFWS) For USFWS species and critical habitat information, use the following webpage: https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility (https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility) For FWS species, include the full printout from your IPaC query/Official Species List. You may be eligible under Criterion C. You must assess whether your discharges or discharge-related activities are likely to result in short- or long-term adverse effects to ESA-listed threatened or endangered species or designated critical habitat. In order to make a determination of your site's likelihood of short- or long-term adverse effects, you must complete the Criterion C Eligibility fields below. You are eligible under Criterion C. Provide the rationale describing specifically how adverse effects to ESA-listed species will be avoided from the discharge and discharge-related activities. There are no anticipated impacts to the NLEB or sandplain gerardia as a result of the project activities because the critical hab itats for these species is not found within the action area. Additionally all tree-clearing will occur outside of active period f or this species. Historic Preservation I have checked the webpage listed above and confirmed that: There are no NMFS-protected species and/or designated critical habitat in my action area. There are NMFS-protected species and/or designated critical habitat in my action area. I have checked the webpage listed above and confirmed that: There are no FWS-protected species and/or designated critical habitat in my action area. There are FWS-protected species and/or designated critical habitat in my action area. Name Uploaded Date Size  Species List_ New England Ecological Services Field Office (2).pdf (attachment/1624210)01/17/2023 248.85 KB Discharges not likely to result in any short- or long-term adverse effects to ESA-listed species and/or designated critical habitat. True I confirm that both ESA-listed species and designated critical habitat under the jurisdiction of the USFWS and/or NMFS were considered in my evaluation. Yes Identify the USFWS information sources used (Note: state resources are not acceptable): The United States Fish and Wildlife Service's IPaC online tool was consulted on 1/16/2023 for the presence on threatened and enge ndered species. Upon review, the action area was determined to be within the range of the northern long-eared bat (Myotis serpent rionalis; Endangered) and Sandplain Gerardia (Agalinis acuta; Endangered). It was determined that the action area would not impac t the endangered species as their critical habitat is not present. Although tree-clearing is part of the project, will occur outs ide of the active periods (April-October) for this species. A review of the Massachusetts Natural Heritage & Endangered Species P rogram Priority and Estimated Habitat of Rare Species indicated that the action area is not within mapped Priority or Estimated H abitat. Identify the NMFS information sources used (Note: state resources are not acceptable): The National Marine Fisheries Service's Greater Atlantic Region ESA Section 7 Mapper was consulted on 11/29/2022 for the presence of threatened and endangered species. Upon review, there are no NMFS-protected species or critical habitat in the action area. You must provide a list of all ESA-listed species and/or designated critical habitat that are located in your "action area". Select one of the options below and provide the required information: Option 1: Enter ESA-listed species Option 2: Attach the species list(s) What is the distance between your site and the ESA-listed species and/or designated critical habitat within the action area (in miles, state "on site" if the ESA-listed species and/or designated critical habitat is within the area to be disturbed)? 0.1 Attach a copy of your site map showing the upland and in-water extent of your "action area". Note: A copy of this site map must also be included with your SWPPP  Name Uploaded Date Size  MA Verification Letter_ Northern Long-Eared Bat (NLEB) Consultation and 4(d) Rule Consistency 2023-01-13.pdf (attachment/1624256)01/17/2023 240.12 KB  Yarmouth ERP Staging.pdf (attachment/1624255)01/17/2023 143.86 KB Have you provided documentation in your SWPPP supporting your eligibility under Criterion C? Yes Successfully saved your form Certification Information Form has not been certified yet. Are you installing any stormwater controls as described in Appendix E (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf) that require subsurface earth disturbances? (Appendix E (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf), Step 1) No  Successfully saved your form APPENDIX D 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 1 of 7 Section A – General Information (If necessary, complete additional inspection reports for each separate inspection location.) Inspector Information Inspector Name: Title: Company Name: Email: Address: Phone Number: Inspection Details Inspection Date: Inspection Location: Inspection Start Time: Inspection End Time: Current Phase of Construction: Weather Conditions During Inspection: Did you determine that any portion of your site was unsafe for inspection per CGP Part 4.5? ☐ Yes ☐ No If “Yes,” provide the following information: Location of unsafe conditions: The conditions that prevented you inspecting this location: Indicate the required inspection frequency: (Check all that apply. You may be subject to different inspection frequencies in different areas of the site.) Standard Frequency (CGP Part 4.2): ☐ At least once every 7 calendar days; OR ☐ Once every 14 calendar days and within 24 hours of the occurrence of either: • A storm event that produces 0.25 inches or more of rain within a 24-hour period, or • A snowmelt discharge from a storm event that produces 3.25 inches or more of snow within a 24-hour period Increased Frequency (CGP Part 4.3.1) (If site discharges to sediment or nutrient-impaired waters or to waters designated as Tier 2, Tier 2.5, or Tier 3): ☐ Once every 7 calendar days and within 24 hours of the occurrence of either: • A storm event that produces 0.25 inches or more of rain within a 24 -hour period, or • A snowmelt discharge from a storm event that produces 3.25 inches or more of snow within a 24 -hour period 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 2 of 7 Reduced Frequency (CGP Part 4.4): ☐ For stabilized areas: Twice during first month, no more than 14 calendar days apart; then once per month after first month until permit coverage is terminated ☐ For stabilized areas on “linear construction sites”: Twice during first month, no more than 14 calendar days apart; then once more within 24 hours of the occurrence of either: • A storm event that produces 0.25 inches or more of rain within a 24-hour period, or • A snowmelt discharge from a storm event that produces 3.25 inches or more of snow within a 24-hour period ☐ For arid, semi-arid, or drought-stricken areas during seasonally dry periods or during drought: Once per month and within 24 hours of the occurrence of either: • A storm event that produces 0.25 inches or more of rain within a 24-hour period, or • A snowmelt discharge from a storm event that produces 3.25 inches or more of snow within a 24-hour period ☐ For frozen conditions where construction activities are being conducted: Once per month Was this inspection triggered by a storm event producing 0.25 inches or more of rain within a 24-hour period? ☐ Yes ☐ No If “Yes,” how did you determine whether the storm produced 0.25 inches or more of rain? ☐ On-site rain gauge ☐ Weather station representative of site. Weather station location: Total rainfall amount that triggered the inspection (inches): Was this inspection triggered by a snowmelt discharge from a storm event producing 3.25 inches or more of snow within a 24-hour period? ☐ Yes ☐ No If “Yes,” how did you determine whether the storm produced 3.25 inches or more of snow? ☐ On-site rain gauge ☐ Weather station representative of site. Weather station location: Total snowfall amount that triggered the inspection (inches): 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 3 of 7 Section B – Condition and Effectiveness of Erosion and Sediment (E&S) Controls (CGP Part 2.2) (Insert additional rows if needed) Type and Location of E&S Control Conditions Requiring Routine Maintenance?1 If “Yes,” How Many Times (Including This Occurrence) Has This Condition Been Identified? Conditions Requiring Corrective Action?2, 3 Date on Which Condition First Observed (If Applicable)? Description of Conditions Observed 1. ☐ Yes ☐ No ☐ Yes ☐ No 2. ☐ Yes ☐ No ☐ Yes ☐ No 3. ☐ Yes ☐ No ☐ Yes ☐ No 4. ☐ Yes ☐ No ☐ Yes ☐ No 5. ☐ Yes ☐ No ☐ Yes ☐ No If the same routine maintenance was found to be necessary three or more times for the same control at the same location (including this occurrence), follow the corrective action requirements and record the required information in your corrective action log, or describe here why you believe the specific condition should still be addressed as routine maintenance: 1 Routine maintenance includes minor repairs or other upkeep performed to ensure that the site’s stormwater controls remain in effective operating condition, not including significant repairs or the need to install a new or replacement control. Routine maintenance is also required for specific conditions: (1) for perimeter controls, whenever sediment has accumulated to half or more the above-ground height of the control (CGP Part 2.2.3.c.i); (2) where sediment has been tracked-out from the site onto paved roads, sidewalks, or other paved areas (CGP Part 2.2.4.d); (3) for inlet protection measures, when sediment accumulates, the filter becomes clo gged, and/or performance is compromised (CGP Part 2.2.10.b); and (4) for sediment basins, as necessary to maintain at least half of the design capacity of the basin (CGP Part 2.2.12.f) 2 Corrective actions are triggered only for specific conditions (CGP Part 5.1): 1. A stormwater control needs a significant repair or a new or replacement control is needed, or, in accordance with Part 2.1.4.c, you find it necessary to repeatedly (i.e., three (3) or more times) conduct the same routine maintenance fix to the same control at the same location (unless you document in your inspection report under Part 4.7.1.c that the specific reoccurrence of this same problem should still be addressed as a routine maintenance fix under 2.1.4); or 2. A stormwater control necessary to comply with the requirements of this permit was never installed, or was installed incorrectly; or 3. Your discharges are not meeting applicable water quality standards; or 4. A prohibited discharge has occurred (see CGP Part 1.3); or 5. During the discharge from site dewatering activities: a. The weekly average of your turbidity monitoring results exceeds the 50 NTU benchmark (or alternate benchmark if approved by EPA pursuant to Part 3.3.2.b); or b. You observe or you are informed by EPA, State, or local authorities of the presence of the conditions specified in Part 4.6.3.e. 3 If a condition on your site requires a corrective action, you must also fill out a corrective action log found at https://www.epa.gov/npdes/construction-general-permit- resources-tools-and-templates. See CGP Part 5.4 for more information. 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 4 of 7 Section C – Condition and Effectiveness of Pollution Prevention (P2) Practices and Controls (CGP Part 2.3) (Insert additional rows if needed) Type and Location of P2 Practices and Controls Conditions Requiring Routine Maintenance?1 If “Yes,” How Many Times (Including This Occurrence) Has This Condition Been Identified? Conditions Requiring Corrective Action?2, 3 Date on Which Condition First Observed (If Applicable)? Description of Conditions Observed 1. ☐ Yes ☐ No ☐ Yes ☐ No 2. ☐ Yes ☐ No ☐ Yes ☐ No 3. ☐ Yes ☐ No ☐ Yes ☐ No 4. ☐ Yes ☐ No ☐ Yes ☐ No 5. ☐ Yes ☐ No ☐ Yes ☐ No If the same routine maintenance was found to be necessary three or more times for the same control at the same location (including this occurrence), follow the corrective action requirements and record the required information in your corrective action log, or describe here why you believe the specific condition should still be addressed as routine maintenance: 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 5 of 7 Section D – Stabilization of Exposed Soil (CGP Part 2.2.14) (Insert additional rows if needed) Specific Location That Has Been or Will Be Stabilized Stabilization Method and Applicable Deadline Stabilization Initiated? Final Stabilization Criteria Met? Final Stabilization Photos Taken? Notes 1. ☐ Yes ☐ No If “Yes,” date initiated: ☐ Yes ☐ No If “Yes,” date criteria met: ☐ Yes ☐ No 2. ☐ Yes ☐ No If “Yes,” date initiated: ☐ Yes ☐ No If “Yes,” date criteria met: ☐ Yes ☐ No 3. ☐ Yes ☐ No If “Yes,” date initiated: ☐ Yes ☐ No If “Yes,” date criteria met: ☐ Yes ☐ No 4. ☐ Yes ☐ No If “Yes,” date initiated: ☐ Yes ☐ No If “Yes,” date criteria met: ☐ Yes ☐ No 5. ☐ Yes ☐ No If “Yes,” date initiated: ☐ Yes ☐ No If “Yes,” date criteria met: ☐ Yes ☐ No 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 6 of 7 4 If a dewatering discharge was occurring, you must conduct a dewatering inspection pursuant to CGP Part 4.3.2 and complete a separate dewatering inspection report. Section E – Description of Discharges (CGP Part 4.6.2) (Insert additional rows if needed) Was a discharge (not including dewatering) occurring from any part of your site at the time of the inspection?4 ☐ Yes ☐ No If “Yes,” for each point of discharge, document the following: • The visual quality of the discharge. • The characteristics of the discharge, including color; odor; floating, settled, or suspended solids; foam; oil sheen; and othe r indicators of stormwater pollutants. • Signs of the above pollutant characteristics that are visible from your site and attributab le to your discharge in receiving waters or in other constructed or natural site drainage features. Discharge Location Observations 1. 2. 3. 4. 5. 2022 Construction General Permit Site Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Page 7 of 7 Section F – Signature and Certification (CGP Part 4.7.2) “I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information contained therein. Based on my in quiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information contained is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.” MANDATORY: Signature of Operator or “Duly Authorized Representative:” Signature: Date: Printed Name: Affiliation: OPTIONAL: Signature of Contractor or Subcontractor Signature: Date: Printed Name: Affiliation: General Tips for Using This Template This Site Inspection Report Template is provided to assist you in preparing site inspection reports for EPA’s 2022 Construction General Permit (CGP). If you are covered under the 2022 CGP, you can use this template to create a site inspection report form that is customized to the specific circumstances of your site and that complies with the minimum reporting requirements of Part 4.7 of the permit. Note that the use of this form is option al; you may use your own site inspection report form provided it includes the minimum information required in Part 4.7 of the CGP. This template does not address the CGP’s inspection reporting requirements related to dewatering activities. A separate inspe ction template has been developed specifically for dewatering activities and is available at https://www.epa.gov/npdes/construction-general-permit-resources-tools-and-templates. Keep in mind that this document is a template and not an “off -the-shelf” inspection report that is ready to use without some modification. You must first customize this form to include the specifics of your project in order for it to be useable for your inspection reports. Once you have entered all of your site- specific information into the blank fields, you may use this form to complete inspection reports. The following tips for using this template will help you ensure that the minimum permit requirements are met: • Review the inspection requirements. Before you start developing your inspection report form, read the CGP’s Part 4 inspection requirements. This will ensure that you have a working understanding of the permit’s underlying inspection requirements. • Complete all required blank fields. Fill out all blank fields. Only by filling out all fields will the template be compliant with the requirements of the permit. (Note: Where you do not need the number of rows provided in the template form for your inspection, you may delete these or cross them off as you see fit. Or, if you need more space to document your findings, you may insert additional rows in the electronic version of this form or use the bottom of the page in the field version of this form.) • Use your site map to document inspection findings. In several places in the template, you are directed to specify the location of certain features of your site, including where stormwater controls are installed and where you will be stabilizing exposed soil. You are also asked to fill in location information for unsafe conditions and the locations of any discharges occurring during your inspections. Where you are asked for location information, EPA encourages you to reference the point on your SWPPP site map that corresponds to the requested location on the inspection form. Using th e site map as a tool in this way will help you conduct efficient inspections, will assist you in evaluating problems found, and will ensure proper documentati on. • Complete the inspection report within 24 hours of completing a site inspection. You must complete an inspection report in accordance with Part 4.7.1 of the CGP. • Include the inspection form with your SWPPP. Once your form is complete, make sure to include a copy of the inspection form in your SWPPP in accordance with Part 7.2.7.e of the CGP. • Retain copies of all inspection reports with your records. You must also retain in your records copies of all inspection reports in accordance with the requirements in Part 4.7.3 of the CGP. These reports must be retained for at least 3 years from the date your permit coverage expires or is terminated in accordance with the requirements in Part 4.7.4 of the CGP. Instructions for Section A Inspector Name Enter the name of the person that conducted the inspection. Include the person’s contact information (title, affiliated company name, address, email, and phone number). Inspection Date and Time Enter the date you performed the inspection and the time you started and ended the inspection. Weather Conditions During Inspection Enter the weather conditions occurring during the inspection, e.g., sunny, overcast, light rain, heavy rain, snowing, icy, windy. Current Phase of Construction If this project is being completed in more than one phase, indicate which phase it is currently in. Inspection Location If your project has multiple locations where you conduct separate inspections, specify the location where this inspection is being conducted. If only one inspection is conducted for your entire project, enter “Entire Site.” If necessary, complete additiona l inspection report forms for each separate inspection location. Unsafe Conditions for Inspection (CGP Part 4.5.7) Inspections are not required where a portion of the site or the entire site is subject to unsafe conditions. These conditions should not regularly occur and should not be consistently present on a site. Generally, unsafe conditions are those that render the site (or a portion of it) inaccessible or that would pose a significant probability of injury to applicable personnel. Examples could include severe storm or flood conditions, high winds, and downed electrical wires. If your site, or a portion of it, is affected by unsafe conditions during the time of your inspection, provide a description of the conditions that prevented you from conducting the inspection and what parts of the site were affected. If the entire site was considered unsafe, specify the location as “Entire Site.” Inspection Frequency Check all the inspection frequencies that apply to your project. Note that you may be subject to different inspection frequencies in different areas of your site. Inspection Triggered by a Storm Event If you were required to conduct this inspection because of a storm event that produced 0.25 inches or more of rain within a 24-hour period, indicate whether you relied on an on-site rain gauge or a nearby weather station (and where the weather station is located). Also, specify the total amount of rai nfall for this specific storm event. If you were required to conduct this inspection because of a snowmelt discharge from a storm event that produced 3.25 inches or more of snow within a 24- hour period, then indicate whether you relied on an on-site measurement or a nearby weather station (and where the weather station is located). Also, specify the total amount of snowfall for this specific storm event. Instructions for Section B Type and Location of Erosion and Sediment (E&S) Controls Provide a list of all erosion and sediment (E&S) controls that your SWPPP indicates will be installed and implemented at your site. This list must include at a minimum all E&S controls required by CGP Part 2.2. Include also any natural buffers established under CGP Part 2.2.1. Buffer requirements apply if your project’s earth-disturbing activities will occur within 50 feet of a discharge to receiving water. You may group your E&S controls on your form if you have several of the same type of controls (e.g., you may group “Inlet Protection Measures,” “Perimeter Controls,” and “Stockpile Controls” together on one line), but if there are any problems with a specific control, you must separately identify the location of the control, whether routine maintenance or corrective action is necessary, and in the notes section you must describe the specifics about the problem you observed. Conditions Requiring Routine Maintenance? Answer “Yes” if the E&S control requires routine maintenance as defined in footnote 1 of this template. Note that in many cases, “Yes” answers are expected and indicate a project with an active operation and maintenance program. You should also answer “Yes” if work to fix the problem is still ongoing from the previous inspection, though necessary work must be initiated immediately and completed by the end of the next business day or within seven calendar days if documented in accordance with CGP Part 2.1.4.b. If “Yes,” How Many Times (Including this Occurrence) Has this Condition Been Identified? Indicate how many times the routine maintenance has been required for the same control at the same location. Conditions Requiring Corrective Action? Answer “Yes” if you found any of the conditions listed in footnote 2 in this template to be present during your inspection (CGP Part 5.1). If you answer “Yes,” you must take corrective action and complete a corrective action log, found at https://www.epa.gov/npdes/construction-general-permit-resources-tools- and-templates. You should also answer “Yes” if work to fix the problem from a previous inspection is still ongoing, though the operator must comply with the corrective action deadlines in CGP Part 5.2. Date on Which Condition First Observed (If Applicable)? Provide the date on which the condition that triggered the need for routine maintenance or corrective action was first identified. If the condition was just discovered during this inspection, enter the inspection date. If the condition is a carryover from a previous inspection, enter the original date of the condition’s discovery. Description of Conditions Observed For each E&S control and the area immediately surrounding it, describe whether the control is properly installed and whether it appears to be working to minimize sediment discharge. Indicate also whether a new or modified control is necessary to comply with the permit. Describe any problem condition(s) you observed such as the following: 1. Failure to install or to properly install a required E&S control 2. Damage or destruction to an E&S control caused by vehicles, equipment, or personnel, a storm event, or other event 3. Mud or sediment deposits found downslope from E&S controls, including in receiving waters, or on nearby streets, curbs, or open conveyance channels 4. Sediment tracked out onto paved areas by vehicles leaving construction site 5. Noticeable erosion or sedimentation at discharge outlets or at adjacent streambanks or channels 6. Erosion of the site’s sloped areas (e.g., formation of rills or gullies) 7. E&S control is no longer working due to lack of maintenance 8. Other incidents of noncompliance Describe also why you think the problem condition(s) occurred as well as actions (e.g., routine maintenance or corrective action) you will take or have taken to fix the problem. For buffer areas, make note of whether they are marked off as required, whether there are signs of construction disturbance within the buffer, which is prohibited under the CGP, and whether there are visible signs of erosion resulting from discharges through the area. If routine maintenance or corrective action is required, briefly note the r eason. If routine maintenance or corrective action has been completed, make a note of the date it was completed and what was done. If corrective action is required, note that you will need to complete a separate corrective action log describing the condition and your work to fix the problem. Routine Maintenance Need Has Been Found to be Necessary Three (3) or More Times for the Same Control at the Same Location (Including this Occurrence) If routine maintenance has been required three (3) or more times for the same control at the same location, the permit requires (CGP Part 2.1.4.c) you to fix the problem using the corrective action procedures in CGP Part 5 or to document why you believe the reoccurring problem can b e addressed as a routine maintenance fix. If you believe the problem can continue to be fixed as routine maintenance, describe why you believe the specific condition should still be addressed as routine maintenance. Instructions for Section C Type and Location of Pollution Prevention (P2) Practices and Controls Provide a list of all pollution prevention (P2) practices and controls that are implemented at your site. This list must include all P2 practices and controls required by CGP Part 2.3 and those that are described in your SWPPP. Conditions Requiring Routine Maintenance? Answer “Yes” if the P2 practice or control requires routine maintenance as defined in footnote 1 of this template. Note that in many cases, “Yes” answers are expected and indicate a project with an active operation and maintenance program. You should also answer “Yes” if work to fix the problem is still ongoing from the previous inspection, though necessary work must be initiated immediately and completed by the end of the next busine ss day or within seven calendar days if documented in accordance with CGP Part 2.1.4.b. If “Yes,” How Many Times (Including this Occurrence) Has this Condition Been Identified? Indicate how many times the routine maintenance has been required for the same practice or control at the same location. Conditions Requiring Corrective Action? Answer “Yes” if you found any of the conditions listed in footnote 2 in this template to be present during your inspection (CGP Part 5.1). If you answer “Yes,” you must take corrective action and complete a corrective action log, found at https://www.epa.gov/npdes/construction -general-permit-resources-tools- and-templates. You should also answer “Yes” if work to fix the problem from a previous inspection is still ongoing, though the operator must comply with the corrective action deadlines in CGP Part 5.2. Date on Which Condition First Observed (If Applicable)? Provide the date on which the condition that triggered the need for maintenance or corrective action was first identified. If the condition was just discovered during this inspection, enter the inspection date. If the condition is a carryover from a previous inspection, ent er the original date of the condition’s discovery. Description of Conditions Observed For each P2 control and the area immediately surrounding it, describe whether the control is properly installed, and whether it appears to be working to minimize or eliminate pollutant discharges. Indicate also whether a new or modified control is necessary to comply with the permit. Describe any problem condition(s) you observed such as the following: 1. Failure to install or to properly install a required P2 control 2. Damage or destruction to a P2 control caused by vehicles, equipment, or personnel, or a storm event 3. Evidence of a spill, leak, or other type of pollutant discharge, or failure to have properly cleaned up a previous spill, leak, or other type of pollutant discharge 4. Spill response supplies are absent, insufficient, or not where they are supposed to be located 5. Improper storage, handling, or disposal of chemicals, building materials or products, fuels, or wastes 6. P2 control is no longer working due to lack of maintenance 7. Other incidents of noncompliance Describe also why you think the problem condition(s) occurred as well as actions (e.g., routine maintenance or corrective action) you will take or have taken to fix the problem. If routine maintenance or corrective action is required, briefly note the reason. If routine maintenance or corrective action has been completed, make a note of the date it was completed and what was done. If corrective action is required, note that you will need to complete a separate corrective action log describing the condition and your work to fix the problem. Routine Maintenance Need Was Found to be Necessary Three (3) or More Times for the Same Control at the Same Location (Including this Occurrence) If routine maintenance has been required three (3) or more times for the same control at the same location, the permit requires (CGP Part 2.1.4.c) you to fix the problem using the corrective action procedures in CGP Part 5 or to document why you believe the reoccurring problem can b e addressed as a routine maintenance fix. If you believe the problem can continue to be fixed as routine maintenance, describe why you believe the spe cific condition should still be addressed as routine maintenance. Instructions for Section D Specific Location That Has Been or Will Be Stabilized List all areas where soil stabilization is required to begin because construction work in that area has permanently stopped o r temporarily stopped (i.e., work will stop for 14 or more days), and all areas where stabilization has been implemented (CGP Part 2.2.14). Stabilization Method and Applicable Deadline For each area, specify the method of stabilization (e.g., hydroseed, sod, planted vegetation, erosion control blanket, mulch, rock). Specify also which of the following stabilization deadlines apply to this location: 1. 5 acres or less of land disturbance occurring at any one time at site: Complete no later than 14 calendar days after stabilization initiated. 2. More than 5 acres of land disturbance occurring at any one time at site: Complete no later than 7 calendar days after stabilization initiated. 3. Arid, semi-arid, and drought-stricken areas: See CGP Part 2.2.14.b.i. 4. Unforeseen circumstances: See CGP Part 2.2.14.b.ii. 5. Discharges to a sediment- or nutrient-impaired water or to a water identified as Tier 2, 2.5, or 3 for antidegradation purposes: Complete no later than 7 days after stabilization initiated. Stabilization Initiated? For each area, indicate whether stabilization has been initiated. If “Yes,” then enter the date stabilization was initiated. Final Stabilization Criteria Met? For each area, indicate whether the final stabilization criteria in CGP Part 2.2.14.c have been met. If “Yes ,” then enter the date final stabilization criteria were met. Final Stabilization Photos Taken? Answer “Yes” if you have taken photos before and after meeting the stabilization criteria as required in CGP Part 8.2.1.a. Notes For each area where stabilization has been initiated, describe the progress that has been made and what additional actions are necessary to complete stabilization. Note the effectiveness of stabilization in preventing erosion. If stabilization has been initiated but not completed, make a note of the date it is to be completed. If stabilization has been completed, make a note of the date it was completed. If stabilization has not yet been initiated, make a note of the date it is to be initiated and the date it is to be completed. Instructions for Section E You are only required to complete this section if a discharge is occurring at the time of the inspection (CGP Part 4.6.2). Was a discharge (not including dewatering) occurring from any part of your site at the time of the inspection? During your inspection, examine all points of discharge from your site, and determine whether a discharge is occurring. If a dewatering discharge was occurring, you must conduct a dewatering inspection pursuant to CGP Part 4.3.2. If there is a discharge, answer “Yes” and complete the questions below regarding the specific discharge. If there is not a discharge, answer “No” and skip to the next page. Discharge Location (Repeat as necessary if there are multiple points of discharge.) Specify the location on your site where the discharge is occurring. The location may be an outlet from a stormwater control o r constructed stormwater channel, a discharge into a storm sewer inlet, or a specific point on the site. Be as specific as possible; it is recommended that you refer to a precise point on your site map. Observations Document the visual quality of the discharge and take note of the characteristics of the stormwater discharge, incl uding color; odor; floating, settled, or suspended solids; foam; oily sheen; and other indicators of stormwater pollutants. Also, document signs of these same pollutant characteristics that are visible from your site and attributable to your discharge in receiving waters or in other constructed or natural site drainage features. Instructions for Section F Each inspection report must be signed and certified to be considered complete (CGP Part 4.7.2). Operator or “Duly Authorized Representative” – MANDATORY (CGP Appendix G Part G.11.2 and CGP Appendix H Section X) At a minimum, the site inspection report must be signed by either (1) the person who signed the NOI, or (2) a duly authorized representative of that person. The following requirements apply: If the signatory will be the person who signed the NOI for permit coverage, as a reminder, that person must be one of the following types of individuals: • For a corporation: By a responsible corporate officer. For the purpose of this subsection, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy - or decision- making functions for the corporation, or (ii) the manager of one or more manufacturing, production, or operating facilities, provided, the manag er is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term envir onmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegate d to the manager in accordance with corporate procedures. • For a partnership or sole proprietorship: By a general partner or the proprietor, respectively. • For a municipality, State, Federal, or other public agency: By either a principal executive officer or ranking elected official. For purposes of this subsection, a principal executive officer of a Federal agency includes (i) the chief executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., Regional Administrator of EPA). If the signatory will be a duly authorized representative, the following requirements must be met: • The authorization is made in writing by the person who signed the NOI (see above); • The authorization specifies either an individual or a position having responsibility for the overall operation of the regulat ed facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named indivi dual or any individual occupying a named position); and • The signed and dated written authorization is included in the SWPPP. A copy must be submitted to EPA, if requested. Sign, date and print your name and affiliation. Contractor or Subcontractor - OPTIONAL Where you rely on a contractor or subcontractor to complete the site inspection report, you should consider requiring the individual(s) to sign and certify each report. Note that this does not relieve you, the permitted operator, of the requirement to sign and certify the site inspection report as well. If applicable, sign, date, and print your name and affiliation. Note While EPA has made every effort to ensure the accuracy of all instructions contained in this template, it is the permit, not this template, that determines the actual obligations of regulated construction stormwater discharges. In the event of a conflict between this template and any corresponding provision of the CGP, you must abide by the requirements in the permit. EPA welcomes comments on this Site Inspection Report Template at any time and will consider those comments in any future revision. You may contact EPA for CGP-related inquiries at cgp@epa.gov 2022 Construction General Permit Dewatering Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Section A – Dewatering Discharges (CGP Part 4.6.3) Complete this section within 24 hours of completing the inspection. (If necessary, complete additional inspection reports for each separate inspection location.) Inspector Information Inspector Name: Title: Company Name: Email: Address: Phone Number: Inspection Details Inspection Date: Inspection Location: Discharge Start Time: Discharge End Time: Rate of Discharge (gallons per day): Corrective Action Required?1 ☐ Yes ☐ No Describe Indicators of Pollutant Discharge at Point of Dewatering Discharge:1 Attach Photographs of: 1. Dewatering water prior to treatment by a dewatering control(s) and the final discharge after treatment; and 2. Dewatering control(s); and 3. Point of discharge to any receiving waters flowing through or immediately adjacent to the site and/or to constructed or n atural site drainage features, storm drain inlets, and other conveyances to receiving waters. 1 If you observe any of the following indicators of pollutant discharge, you are required to take corrective action under Part 5.1.5.b: • a sediment plume, suspended solids, unusual color, presence of odor, decreased clarity, or presence of foam; or • a visible sheen on the water surface or visible oily deposits on the bottom or shoreline of the receiving water. 2022 Construction General Permit Dewatering Inspection Report Project Name: _______________________________________ NPDES ID Number: ________________________________ Section B – Signature and Certification (CGP Part 4.7.2) “I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in acc ordance with a system designed to assure that qualified personnel properly gathered a nd evaluated the information contained therein. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information contained is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.” MANDATORY: Signature of Operator or “Duly Authorized Representative:” Signature: Date: Printed Name: Affiliation: OPTIONAL: Signature of Contractor or Subcontractor Signature: Date: Printed Name: Affiliation: General Tips for Using This Template This Dewatering Inspection Report Template is provided to assist you in preparing dewatering inspection reports for EPA’s 2022 Construction General Permit (CGP). If you are covered under the 2022 CGP, you can use this template to create a dewatering inspection report form that complies with the minimum reporting requirements of Part 4.6.3 of the permit. Note that the use of this form is optional; you may use your own inspection report form provided it includes the minimum information required in Part 4.6.3 of the CGP. This template is for dewatering inspections only. A separate site inspection report template that does not include dewatering inspections and complies with the minimum reporting requirements of Part 4.7 of the permit is available at https://www.epa.gov/npdes/construction-general-permit-resources-tools-and- templates. If you are covered under a State CGP, this template may be helpful in developing a report that can be used for that permit; however, it will need to be modified to meet the specific requirements of that permit. If your permitting authority requires you to use a specific inspection report form, you should not use this form. The following tips for using this template will help you ensure that the minimum permit requirements are met: • Review the inspection requirements. Before you start developing your inspection report form, read the CGP’s Part 4 inspection requirements. This will ensure that you have a working understanding of the permit’s underlying inspection requirements. • Complete all required blank fields. Fill out all blank fields. Only by filling out all fields will the template be compliant with the requirements of the permit. (Note: Where you do not need the number of rows provided in the template form for your inspection, you may delete these as you see fit. Or, if you need more space to document your findings, you may insert additional rows in the electronic version of this form or use the bottom of the page in the field version of this form.) • Use your site map to document inspection findings. In several places in the template, you are directed to specify the location of certain features of your site, including where stormwater controls are installed and where you will be stabilizing exposed soil. You are also asked to fill in location information for unsafe conditions and the locations of any discharges occurring during your inspections. Where you are asked for location inf ormation, EPA encourages you to reference the point on your SWPPP site map that corresponds to the requested location on the inspection form. Using the site map as a tool in this way will help you conduct efficient inspections, will assist you in evaluating problems found, and will ensure proper documentation. • Include the inspection form with your SWPPP. Once your form is complete, make sure to include a copy of the inspection form in your SWPPP in accordance with Part 7.2.7.e of the CGP. • Retain copies of all inspection reports with your records. You must also retain copies of all inspection reports in your records in accordance with the requirements in Part 4.7.3 of the CGP. These reports must be retained for at least 3 years from the date your permit coverage expires or is terminated in accordance with the requirements in Part 4.7.4 of the CGP. Instructions for Section A Inspector Name Enter the name of the person that conducted the inspection. Include the person’s contact information (title, affiliated company name, address, email, and phone number). Inspection Date Enter the date you performed the inspection. Inspection Location If your project has multiple locations where you conduct separate dewatering inspections, specify the location where this inspection is being conducted. Otherwise, you can enter “dewatering operation.” Discharge Start and End Times Enter the approximate time the dewatering discharge started and ended on the day of the inspection. Rate of Discharge Enter the rate of discharge in gallons per day on the day of inspection. To estimate the approximate discharge rate on the day of dewatering inspection, one approach is to use the manufacturer’s des ign pump rating for the pump model in use. For example, a pump rated at 164 gpm (gallons per minute) by the manufacturer can be assumed to be discharging at 164 gpm in most cases. To convert to gallons per day, multiply the rate in gpm by the ratio of minutes in one-day (1,440 minutes per day), resulting in a discharge rate of 236,160 gallons per day. In cases where the dewatering discharge is being pumped over long distances or a substantial distance uphill, which will result in a reduced pump rate relative to manufacturer’s specification, the operator may improve the accuracy of the estimate by estimating the time requir ed to fill a container of a known volume. For example, if it takes 60 seconds to fill an empty 55-gallon barrel, the estimated discharge rate is 55 gpm, or 79,200 gallons per day. Indicators of Pollutant Discharge For the point of discharge, describe any observed sediment plume, suspended solids, unusual color, presence of odor, decreased clarity, or presence of foam; and/or a visible sheen on the water surface or visible oily deposits on the bottom or shoreline of the receiving water. Corrective Action Required? Answer “Yes” if during your inspection you found any of the conditions listed above in the instructions for the Indicators of Pollutant Discharge section. If you answer “Yes,” you must take corrective action and complete a corrective action log, found at https://www.epa.gov/npdes/construction-general-permit- resources-tools-and-templates. Answer “No” if you did not observe any of the listed pollutant indicators. Photographs As required in CGP Part 8.2.1.a, attach photos of: (1) dewatering water prior to treatment by a dewatering control(s) and the final discharge after treatment; (2) the dewatering control(s); and (3) the point of discharge to any receiving waters flowing through or immediately adjacent to the site and/or to constructed or natural site drainage features, storm drain inlets, and other conveyances to receiving waters. Instructions for Section B Each inspection report must be signed and certified to be considered complete (CGP Part 4.7.2). Operator or “Duly Authorized Representative” – MANDATORY (CGP Appendix G Part G.11.2 and CGP Appendix H Section X) At a minimum, the dewatering inspection report must be signed by either (1) the person who signed the NOI, or (2) a duly authorized representative of that person. The following requirements apply: If the signatory will be the person who signed the NOI for permit coverage, as a reminder, that person must be one of the following types of individuals: • For a corporation: By a responsible corporate officer. For the purpose of this subsection, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy - or decision- making functions for the corporation, or (ii) the manager of one or more manufacturing, production, or operating facilities, provided, the manager is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term environmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken t o gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures. • For a partnership or sole proprietorship: By a general partner or the proprietor, respectively. • For a municipality, State, Federal, or other public agency: By either a principal executive officer or ranking elected official. For purposes of this subsection, a principal executive officer of a Federal agency includes (i) the chief executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., Regional Administrator o f EPA). If the signatory will be a duly authorized representative, the following requirements must be met: • The authorization is made in writing by the person who signed the NOI (see above); • The authorization specifies either an individual or a position having responsibility for the overall oper ation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and • The signed and dated written authorization is included in the SWPPP. A copy must be submitted to EPA, if requeste d. Sign, date and print your name and affiliation. Contractor or Subcontractor - OPTIONAL Where you rely on a contractor or subcontractor to complete the dewatering inspection report, you should consider requiring the individual(s) to sign and certify each report. Note that this does not relieve you, the permitted operator, of the requirement to sign and certify the dewatering inspection report as well. If applicable, sign, date, and print your name and affiliation. Note While EPA has made every effort to ensure the accuracy of all instructions contained in this template, it is the permit, not t his template, that determines the actual obligations of regulated construction stormwater discharges. In the event of a conflict be tween this template and any corresponding provision of the CGP, you must abide by the requirements in the permit. EPA welcomes comments on this Dewatering Inspection Report Template at any time and will consider those comments in any future revision. You may contact EPA for CGP-related inquiries at cgp@epa.gov APPENDIX E 2022 CGP Corrective Action Log Project Name: ______________________________________________ NPDES ID Number: __________________________________________ Section A – Individual Completing this Log Name: Title: Company Name: Email: Address: Phone Number: Section B – Details of the Problem (CGP Part 5.4.1.a) Complete this section within 24 hours of discovering the condition that triggered corrective action. Date problem was first identified: Time problem was first identified: What site conditions triggered this corrective action? (Check the box that applies. See instructions for a description of each triggering condition (1 thru 6).) ☐ 1 ☐ 2 ☐ 3 ☐ 4 ☐ 5a ☐ 5b ☐ 6 Specific location where problem identified: Provide a description of the specific condition that triggered the need for corrective action and the cause (if identifiable): Section C – Corrective Action Completion (CGP Part 5.4.1.b) Complete this section within 24 hours after completing the corrective action. For site condition # 1, 2, 3, 4, or 6 (those not related to a dewatering discharge) confirm that you met the following deadlines (CGP Part 5.2.1): ☐ Immediately took all reasonable steps to address the condition, including cleaning up any contaminated surfaces so the materi al will not discharge in subsequent storm events. AND ☐ Completed corrective action by the close of the next business day, unless a new or replacement control, or significant repair, was required. OR ☐ Completed corrective action within seven (7) calendar days from the time of discovery because a new or replacement control, o r significant repair, was necessary to complete the installation of the new or modified control or complete the repair. OR ☐ It was infeasible to complete the installation or repair within 7 calendar days from the time of discovery. Provide the follo wing additional information: Explain why 7 calendar days was infeasible to complete the installation or repair: Provide your schedule for installing the stormwater control and making it operational as soon as feasible after the 7 calendar days: For site condition # 5a, 5b, or 6 (those related to a dewatering discharge), confirm that you met the following deadlines: ☐ Immediately took all reasonable steps to minimize or prevent the discharge of pollutants until a solution could be implemented, including shutting off the dewatering discharge as soon as possible depending on the severity of the condition taking safety considerations into account . ☐ Determined whether the dewatering controls were operating effectively and whether they were causing the conditions. ☐ Made any necessary adjustments, repairs, or replacements to the dewatering controls to lower the turbidity levels below the benchmark or remove the visible plume or sheen. Describe any modification(s) made as part of corrective action: (Insert additional rows below if applicable) Date of completion: SWPPP update necessary? If yes, date SWPPP was updated: 1. ☐ Yes ☐ No 2. ☐ Yes ☐ No Section D - Signature and Certification (CGP Part 5.4.2) “I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information contained therein. Based on my in quiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information contained is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.” MANDATORY: Signature of Operator or “Duly Authorized Representative:” Signature: Date: Printed Name: Affiliation: OPTIONAL: Signature of Contractor or Subcontractor Signature: Date: Printed Name: Affiliation: General Instructions This Corrective Action Log Template is provided to assist you creating a corrective action log that complies with the minimum reporting requirements of Part 5.4 of the EPA’s Construction General Permit (CGP). For each triggering condition on your site, you will need to fill out a separate corrective action log. The entire form must be completed to be compliant with the requirements of the permit. (Note: In Section C, if you do not need the number of rows provided in the corrective action log, you may delete these or cross them off. Alternatively, if you need more space to describe any modifications, you may insert additional rows in the electronic version of this form or use the bottom of the page in the field version of this form.) If you are covered under a State CGP, this template may be helpful in developing a log that can be used for that permit; however, you will likely need to modify this form to meet the specific requirements of any State-issued permit. If your permitting authority requires you to use a specific corrective action log, you should not use this template. Instructions for Section A Individual completing this form Enter the name of the person completing this log. Include the person’s contact information (title, affiliated company name, address, email, and phone number). Instructions for Section B You must complete Section B within 24 hours of discovering the condition that triggered corrective action. (CGP Part 5.4) When was the problem first discovered? Specify the date and time when the triggering condition was first discovered. What site conditions triggered this corrective action? (CGP Parts 5.1 and 5.3) Check the box corresponding to the numbered triggering condition below that applies to your site. 1. A stormwater control needs a significant repair or a new or replacement control is needed, or, in accordance with Part Error! Reference source not found., you find it necessary to repeatedly (i.e., 3 or more times) conduct the same routine maintenance fix to the same control at the same location (unless you document in your inspection report under Part Error! Reference source not found. that the specific reoccurrence of this same problem should still be addressed as a routine maintenance fix under Part Error! Reference source not found.); 2. A stormwater control necessary to comply with the requirements of this permit was never installed, or was installed incorrect ly; 3. Your discharges are not meeting applicable water quality standards; 4. A prohibited discharge has occurred (see Part 1.3); 5. During discharge from site dewatering activities: a. The weekly average of your turbidity monitoring results exceeds the 50 NTU benchmark (or alternate benchmark if approved by EPA pursuant to Part Error! Reference source not found.); or b. You observe or you are informed by EPA, State, or local authorities of the presence of any of the following at the point of discharge to a receiving water flowing through or immediately adjacent to your site and/or to constructed or natural site drainage features or storm drain inlets: • sediment plume • suspended solids • unusual color • presence of odor • decreased clarity • presence of foam • visible sheen on the water surface or visible oily deposits on the bottom or shoreline of the receiving water 6. EPA requires corrective action as a result of permit violations found during an inspection carried out under Part 4.8. Provide a description of the problem (CGP Part 5.4.1.a) Provide a summary description of the condition you found that triggered corrective action, the cause of the problem (if identifiable), and the specific location where it was found. Be as specific as possible about the location; it is recommended that you refer to a precise point on your site map. Instructions for Section C You must complete Section C within 24 hours after completing the correction action. (CGP Part 5.4) Deadlines for completing corrective action for condition # 1, 2, 3, 4, or 6 (if not relating to a dewatering discharge) (CGP Part 5.2.1) Check the box to confirm that you met the deadlines that apply to each triggering condition. You are always required to check the first box (i.e., Immediately took all reasonable steps to address the condition, including cleaning up any contaminated surfac es so the material will not discharge in subsequent storm events.). Only one of the next three boxes should be checked depending on the situation that applies to this corrective action. Check the second box if the corrective action for this particular triggering condition does not require a new or replacement control, or a significant repair. These actions must be completed by the close of the next business day from the time of discovery of the condition. Check the third box if the corrective action for this particular triggering condition requires a new or replacement control, or a significant repair. These actions must be completed by no later than seven calendar days from the time of discover of the condition. Check the fourth box if the corrective action for this particular triggering condition requires a new or replacement control, or a significant repair , and if it is infeasible to complete the work within seven calendar days. Additionally, you will need to fill out the table below the ch eckbox that requires: 1. An explanation as to why it was infeasible to complete the installation or repair within seven calendar days of discovering t he condition. 2. Provide the schedule you will adhere to for installing the stormwater control and making it operational as soon as feasible after the seventh day following discovery. Note: Per Part 5.2.1.c, where these actions result in changes to any of the stormwater controls or procedures documented in y our SWPPP, you must modify your SWPPP accordingly within seven calendar days of completing this work. Deadlines for completing corrective action for condition # 5a, 5b, or 6 related to a dewatering discharge (CGP Part 5.2.2) These deadlines apply to conditions relating to construction dewatering activities. Check the box to confirm that you met the deadlines that apply to each triggering condition. You are required to check all of the boxes in this section to indicate your compliance with the co rrective action deadlines. List of modification(s) to correct problem Provide a list of modifications you completed to correct the problem. Date of completion Enter the date you completed the modification. The work must be completed by the deadline you indicated above. SWPPP update necessary? Check “Yes” or “No” to indicate if a SWPPP update is necessary consistent with Part 7.4.1.a in order to reflect changes implemented at your site. If “Yes,” then enter the date you updated your SWPPP. The SWPPP updates must be made within seven calendar days of completing a corrective action. (CGP Part 5.2.1.c) Instructions for Section D Each corrective action log entry must be signed and certified following completion of Section D to be considered complete. (CGP Part 5.4.2) Operator or “Duly Authorized Representative” – MANDATORY (CGP Appendix G Part G.11.2 and CGP Appendix H Section X) At a minimum, the corrective action log must be signed by either (1) the person who signed the NOI, or (2) a duly authorized representative of that person. The following requirements apply: If the signatory will be the person who signed the NOI for permit coverage, as a reminder, that person must be one of the following types of individuals: • For a corporation: By a responsible corporate officer. For the purpose of this subsection, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy- or decision- making functions for the corporation, or (ii) the manager of one or more manufacturing, production, or operating facilities, provided, the manager is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term envir onmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegate d to the manager in accordance with corporate procedures. • For a partnership or sole proprietorship: By a general partner or the proprietor, respectively. • For a municipality, State, Federal, or other public agency: By either a principal executive officer or ranking elected official. For purposes of this subsection, a principal executive officer of a Federal agency includes (i) the chief executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., Regional Administrator of EPA). If the signatory will be a duly authorized representative, the following requirements must be met: • The authorization is made in writing by the person who signed the NOI (see above); • The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named indivi dual or any individual occupying a named position); and • The signed and dated written authorization is included in the SWPPP. A copy must be submitted to EPA, if requested. Sign, date and print your name and affiliation. Contractor or Subcontractor - OPTIONAL Where you rely on a contractor or subcontractor to complete this log and the associated corrective action, you should consider requiring the individual(s) to sign and certify each log entry. Note that this does not relieve you, the permitted operator, of the requirement to sign and certify the log as well. If applicable, sign, date, and print your name and affiliation. Recordkeeping Logs must be retained for at least 3 years from the date your permit coverage expires or is terminated. (CGP Part 5.4.4) Keep copies of your signed corrective action log entries at the site or at an easily accessible location so that it can be ma de immediately available at the time of an on-site inspection or upon request by EPA. (CGP Part 5.4.3) Include a copy of the corrective action log in your SWPPP. (CGP Part 7.2.7.e) Note While EPA has made every effort to ensure the accuracy of all instructions contained in this template, it is the permit, not this template, that determines the actual obligations of regulated construction stormwater discharges. In the event of a conflict between this template and any corresponding provision of the CGP, you must abide by the requirements in the permit. EPA welcomes comments on this Corrective Action Log Template at any ti me and will consider those comments in any future revision. You may contact EPA for CGP-related inquiries at cgp@epa.gov APPENDIX F SWPPP Amendment Log Project Name: ____________________ Amendment No. Description of the Amendment Date of Amendment Amendment Prepared by [Name(s) and Title] APPENDIX G SUBCONTRACTOR CERTIFICATION STORMWATER POLLUTION PREVENTION PLAN Project Title: _____________________________ Operator(s): ___________________ As a subcontractor, you are required to comply with the Stormwater Pollution Prevention Plan (SWPPP) for any work that you perform on-site. Any person or group who violates any condition of the SWPPP may be subject to substantial penalties or loss of contract. You are encouraged to advise each of your employees working on this project of the requirements of the SWPPP. A copy of the SWPPP is available for your review at the office trailer. Each subcontractor engaged in activities at the construction site that could impact stormwater must be identified and sign the following certification statement: I certify under the penalty of law that I have read and understand the terms and conditions of the SWPPP for the above designated project and agree to follow the practices described in the SWPPP. This certification is hereby signed in reference to the above-named project: Company: ________________________________ Address: _________________________________ Telephone Number: _______________ Type of construction service to be provided: ______________ Signature: Title: Date: APPENDIX H Sequence of Major Activities Project Name: _______________________________ The proposed sequencing of major activities is provided in Section 3.4. Activities must include implementation of all stabilization practices and pollution control measures (BMPs), and major grading activities. In addition, the dates when construction activities temporarily or permanently cease on any portion of the site must be indicated. Operator Activity Location on Site Intended Timing Actual Timing Start Date Start Date End Date End Date APPENDIX I SWPPP TRAINING LOG Project Name: Project Location: Instructor’s Name(s): Instructor’s Title(s): Course Location: Date: Course Length (hours): Stormwater Training Topic: (check as appropriate) ❑ Sediment and Erosion Controls ❑ Emergency Procedures ❑ Stabilization Controls ❑ Inspections/Corrective Actions ❑ Pollution Prevention Measures Specific Training Objective: Attendee Roster: (attach additional pages as necessary) No. Name of Attendee Company 1 2 3 4 5 6 7 8 9 10 11 12 APPENDIX J DELEGATION OF AUTHORITY I, James Clancy, hereby designate the person or specifically described position below to be a duly authorized representative for the purpose of overseeing compliance with environmental requirements, including the Construction General Permit, at the Eversource ERP Staging Yard site. The designee is authorized to sign any reports, stormwater pollution prevention plans, and all other documents required by the permit: Amanda Houle (name of person or position) Tighe & Bond (company) 4 Barlows Landing Road, Unit 15 (address) Pocasset, MA 02559 (city, state, zip) (508) 304-6354 (phone) By signing this authorization, I confirm that I meet the requirements to make such a designation as set forth in Appendix I of EPA’s Construction General Permit (CGP), and that the designee above meets the definition of a “duly authorized representative” as set forth in Appendix I. I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I have no personal knowledge that the information submitted is other than true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonmen t for knowing violations. Name: James Clancy Company: Eversource Energy Title: Associate Environmental Specialist – Licensing & Permitting Signature: Date: 1/18/2023 APPENDIX K 314 CMR: DIVISION OF WATER POLLUTION CONTROL 4.06: continued 314 CMR: DIVISION OF WATER POLLUTION CONTROL 4.06: continued TABLE 4 CAPE COD COASTAL DRAINAGE AREA* Surface Water Name† Surface Water or Segment Boundary Mile Point‡Class Qualifiers Scorton Harbor Entire harbor SA Shellfishing Scorton Creek Source in Sandwich to confluence with Scorton Harbor and those tributaries thereto SA, B Shellfishing 12 Barnstable Harbor Entire area, excluding Freezer Point and the developed marina 3 SA Shellfishing ORW Broad Sound Entire sound SA Shellfishing Bass Creek Entire creek SA Shellfishing Brickyard Creek Entire creek SA, B Shellfishing12 Mill Creek Entire creek SA Shellfishing Wells Creek Entire creek SA Shellfishing Namskaket Creek Entire creek SA, B Shellfishing4 1 2 ORW Little Namskaket Creek Entire creek SA, B Shellfishing412 ORW Rock Harbor Creek Entire creek SA, B Shellfishing412 ORW Boat Meadow River Entire river SA, B Shellfishing412 ORW Herring River Entire river SA, B Shellfishing412 ORW Pleasant Bay Entire bay and those tributaries thereto SA, B Shellfishing 512 ORW Ryder Cove Portion of the surface water within the Pleasant Bay ACEC, Chatham SA ORW Bassing Harbor Portion of the surface water within the Pleasant Bay ACEC, Chatham SA ORW Frost Fish Creek Portion of the surface water within the Pleasant Bay ACEC, Chatham SA, B ORW1 Muddy Creek Portion of the surface water within the Pleasant Bay ACEC, Chatham SA ORW Round Cove Portion of the surface water within the Pleasant Bay ACEC, Harwich SA ORW Namequoit River Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW The River Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW 314 CMR: DIVISION OF WATER POLLUTION CONTROL 4.06: continued TABLE 4 CAPE COD COASTAL DRAINAGE AREA (continued)* Surface Water Name† Surface Water or Segment Boundary Mile Point‡Class Qualifiers The Horseshoe Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW The Narrows Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW Frostfish Cove Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW Hog Island Creek Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW Broad Creek Portion of the surface water within the Pleasant Bay ACEC, Orleans SA ORW Waquoit Bay Entire bay and those tributaries thereto SA, B Shellfishing612 ORW Childs River Portion of the surface water within the Waquoit Bay ACEC, Falmouth SA, B ORW1 Quashnet River Portion of the surface water within the Waquoit Bay ACEC, Falmouth SA, B ORW1 Red Brook Portion of the surface water within the Waquoit Bay ACEC, Mashpee SA, B ORW1 Falmouth Inner Harbor Falmouth SB Shellfishing Herring Pond (Coles Pond) Entire pond in Eastham SA, B Warm Water412 ORW Cedar Pond Entire pond in Orleans SA, B Warm Water 412 ORW Stillwater Pond Entire pond in Chatham B Warm Water5 ORW Lovers Lake Entire lake in Chatham B Warm Water 5 ORW Mill Pond Entire pond in Chatham/East Harwich B Warm Water 5 ORW Ministers Pond Entire pond in Chatham B Warm Water 5 ORW Crows Pond Entire pond in Chatham SA ORW 5 Pilgrim Lake (Dean Sparrows Pond) Entire lake in Orleans B Warm Water5 ORW Quanset Pond Entire pond in Orleans SA ORW 5 Crystal Lake (Fresh Pond) Entire lake in Orleans B Warm Water5 ORW 4.06: continued 314 CMR: DIVISION OF WATER POLLUTION CONTROL TABLE 4 CAPE COD COASTAL DRAINAGE AREA (continued)* Surface Water Name† Surface Water or Segment Boundary Mile Point‡Class Qualifiers Paw Wah Pond Entire pond in Orleans SA ORW5 Uncle Seths Pond Entire pond in Orleans B Warm Water 5 ORW Sarahs Pond Entire pond in Orleans B Warm Water 5 ORW Areys Pond Entire pond in Orleans SA ORW5 Gould Pond Entire pond in Orleans B Warm Water 5 ORW Kescayo Gansett Pond Entire pond in Orleans SA ORW 5 Meeting House Pond Entire pond in Orleans SA ORW5 Bourne Pond Entire pond in Falmouth B Warm Water 6 ORW Bog Pond Entire pond in Falmouth SA, B Warm Water 612 ORW Caleb Pond Entire pond in Falmouth SA ORW6 Hamblin Pond Entire pond in Falmouth/Mashpee SA ORW6 Flat Pond Entire pond in Mashpee SA, B Warm Water612 ORW Jehu Pond Entire pond in Mashpee SA ORW6 Jim Pond Entire pond in Mashpee B Warm Water 6 ORW Lily Pond (Little Flat Pond) Entire pond in Mashpee SA, B Warm Water612 ORW Sage Lot Pond Entire pond in Mashpee SA ORW6 Witch Pond Entire pond in Mashpee B Warm Water 6 ORW Long Pond (Long Pond Reservoir) Entire pond to outlet in Falmouth and those tributaries thereto A PWS ORW 314 CMR: DIVISION OF WATER POLLUTION CONTROL 4.06: continued TABLE 4 CAPE COD COASTAL DRAINAGE AREA (continued)* Surface Water Name† Surface Water or Segment Boundary Mile Point‡Class Qualifiers Atlantic Ocean and other surface waters within/bordering the Cape Cod National Seashore Waters within and adjacent (within 1,000 feet seaward of mean low water) to the Cape Cod National Seashore SA, B Shellfishing12 ORW * Acronyms: ACEC =Area of Critical Environmental Concern ORW =Outstanding Resource Water PWS =Public Water Supply † Names cited in parentheses are unofficial, locally-used names. ‡ Mile Point values represent the approximate distance in miles of each end of a given surface water or segment from its mouth (assigned a value of "0"). Mile Points are provided where available for convenience in locating the upstream and downstream ends of segments. Narrative descriptions of surface water or segment boundaries, however, always control over boundaries based upon Mile Points. Coastal and marine waters Class SA; fresh waters Class B.1 S h el l fis h i n g ap p l i es t o mari n e and co astal wat ers only; warm water applies to fresh wat ers only.2 Note that all or a portion of this surface water is within the Sandy Neck Barrier Beach System ACEC.3 Note that all or a portion of this surface water is within the Inner Cape Cod Bay ACEC.4 Note that all or a portion of this surface water is within the Pleasant Bay ACEC.5 Note that all or a portion of this surface water is within the Waquoit Bay ACEC.6 APPENDIX L January 16, 2023 United States Department of the Interior FISH AND WILDLIFE SERVICE New England Ecological Services Field Office 70 Commercial Street, Suite 300 Concord, NH 03301-5094 Phone: (603) 223-2541 Fax: (603) 223-0104 In Reply Refer To: Project Code: 2022-0076627 Project Name: Eversource ERP Staging Yard Subject:List of threatened and endangered species that may occur in your proposed project location or may be affected by your proposed project To Whom It May Concern: Updated 12/27/2022 - Please review this letter each time you request an Official Species List, we will continue to update it with additional information and links to websites may change. About Official Species Lists The purpose of the Act is to provide a means whereby threatened and endangered species and the ecosystems upon which they depend may be conserved. Federal and non-Federal project proponents have responsibilities under the Act to consider effects on listed species. The enclosed species list identifies threatened, endangered, proposed, and candidate species, as well as proposed and final designated critical habitat, that may occur within the boundary of your proposed project and/or may be affected by your proposed project. The species list fulfills the requirements of the U.S. Fish and Wildlife Service (Service) under section 7(c) of the Endangered Species Act (Act) of 1973, as amended (16 U.S.C. 1531 et seq.). New information based on updated surveys, changes in the abundance and distribution of species, changed habitat conditions, or other factors could change this list. Please note that under 50 CFR 402.12(e) of the regulations implementing section 7 of the Act, the accuracy of this species list should be verified after 90 days. The Service recommends that verification be completed by visiting the ECOS-IPaC website at regular intervals during project planning and implementation for updates to species lists and information. An updated list may be requested by returning to an existing project’s page in IPaC. Endangered Species Act Project Review Please visit the “New England Field Office Endangered Species Project Review and Consultation” website for step-by-step instructions on how to consider effects on listed 01/16/2023 2 species and prepare and submit a project review package if necessary: https://www.fws.gov/office/new-england-ecological-services/endangered-species-project-review *NOTE* Please do not use the Consultation Package Builder tool in IPaC except in specific situations following coordination with our office. Please follow the project review guidance on our website instead and reference your Project Code in all correspondence. Northern Long-eared Bat - (Updated 12/27/2022) Please visit our New England Field Office Project Review webpage at the link above for updated northern long-eared bat consultation guidance. The Service published a final rule to reclassify the northern long-eared bat (NLEB) as endangered on November 30, 2022. The final rule will go into effect on January 30, 2023. After that date, the current 4(d) rule for NLEB will no longer be in effect, and the 4(d) determination key will no longer be available. New compliance tools will be available by mid- to late-January, and information will be posted on our New England Field Office Project Review webpage in January, so please check this site often for updates. Depending on the type of effects a project has on NLEB, the change in the species’ status may trigger the need to re-initiate consultation for any actions that are not completed and for which the Federal action agency retains discretion once the new listing determination becomes effective. If your project may result in incidental take of NLEB after the new listing goes into effect, this will need to be addressed in an updated consultation that includes an Incidental Take Statement. Many of these situations will be addressed through the new compliance tools. If your project may require re-initiation of consultation, please wait for information on the new tools to appear on our website or contact our office at newengland@fws.gov for additional guidance. Additional Info About Section 7 of the Act Under section 7(a)(2) of the Act and its implementing regulations (50 CFR 402 et seq.), Federal agencies are required to determine whether projects may affect threatened and endangered species and/or designated critical habitat. If a Federal agency, or its non-Federal representative, determines that listed species and/or designated critical habitat may be affected by the proposed project, the agency is required to consult with the Service pursuant to 50 CFR 402. In addition, the Federal agency also may need to consider proposed species and proposed critical habitat in the consultation. 50 CFR 402.14(c)(1) specifies the information required for consultation under the Act regardless of the format of the evaluation. More information on the regulations and procedures for section 7 consultation, including the role of permit or license applicants, can be found in the "Endangered Species Consultation Handbook" at: https://www.fws.gov/service/section-7-consultations In addition to consultation requirements under Section 7(a)(2) of the ESA, please note that under sections 7(a)(1) of the Act and its implementing regulations (50 CFR 402 et seq.), Federal agencies are required to utilize their authorities to carry out programs for the conservation of threatened and endangered species. Please contact NEFO if you would like more information. Candidate species that appear on the enclosed species list have no current protections under the 01/16/2023 3 ▪ ESA. The species’ occurrence on an official species list does not convey a requirement to consider impacts to this species as you would a proposed, threatened, or endangered species. The ESA does not provide for interagency consultations on candidate species under section 7, however, the Service recommends that all project proponents incorporate measures into projects to benefit candidate species and their habitats wherever possible. Migratory Birds In addition to responsibilities to protect threatened and endangered species under the Endangered Species Act (ESA), there are additional responsibilities under the Migratory Bird Treaty Act (MBTA) and the Bald and Golden Eagle Protection Act (BGEPA) to protect native birds from project-related impacts. Any activity, intentional or unintentional, resulting in take of migratory birds, including eagles, is prohibited unless otherwise permitted by the U.S. Fish and Wildlife Service (50 C.F.R. Sec. 10.12 and 16 U.S.C. Sec. 668(a)). For more information regarding these Acts see: https://www.fws.gov/program/migratory-bird-permit https://www.fws.gov/library/collections/bald-and-golden-eagle-management Please feel free to contact us at newengland@fws.gov with your Project Code in the subject line if you need more information or assistance regarding the potential impacts to federally proposed, listed, and candidate species and federally designated and proposed critical habitat. Attachment(s): Official Species List Attachment(s): Official Species List 01/16/2023 1 Official Species List This list is provided pursuant to Section 7 of the Endangered Species Act, and fulfills the requirement for Federal agencies to "request of the Secretary of the Interior information whether any species which is listed or proposed to be listed may be present in the area of a proposed action". This species list is provided by: New England Ecological Services Field Office 70 Commercial Street, Suite 300 Concord, NH 03301-5094 (603) 223-2541 01/16/2023 2 Project Summary Project Code:2022-0076627 Project Name:Eversource ERP Staging Yard Project Type:Commercial Development Project Description:Eversource Energy is proposing to construct a staging area on an undeveloped portion of the Yarmouth Work Center. Approximately three acres of forested land will be converted into a paved staging area to be used for storm staging. Project Location: Approximate location of the project can be viewed in Google Maps: https:// www.google.com/maps/@41.6758769,-70.26339154918367,14z Counties:Barnstable County, Massachusetts 01/16/2023 3 1. Endangered Species Act Species There is a total of 3 threatened, endangered, or candidate species on this species list. Species on this list should be considered in an effects analysis for your project and could include species that exist in another geographic area. For example, certain fish may appear on the species list because a project could affect downstream species. IPaC does not display listed species or critical habitats under the sole jurisdiction of NOAA Fisheries , as USFWS does not have the authority to speak on behalf of NOAA and the Department of Commerce. See the "Critical habitats" section below for those critical habitats that lie wholly or partially within your project area under this office's jurisdiction. Please contact the designated FWS office if you have questions. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an office of the National Oceanic and Atmospheric Administration within the Department of Commerce. Mammals NAME STATUS Northern Long-eared Bat Myotis septentrionalis No critical habitat has been designated for this species. Species profile: https://ecos.fws.gov/ecp/species/9045 Endangered Insects NAME STATUS Monarch Butterfly Danaus plexippus No critical habitat has been designated for this species. Species profile: https://ecos.fws.gov/ecp/species/9743 Candidate Flowering Plants NAME STATUS Sandplain Gerardia Agalinis acuta No critical habitat has been designated for this species. Species profile: https://ecos.fws.gov/ecp/species/8128 Endangered Critical habitats THERE ARE NO CRITICAL HABITATS WITHIN YOUR PROJECT AREA UNDER THIS OFFICE'S JURISDICTION. 1 01/16/2023 4 IPaC User Contact Information Agency:Tighe & Bond Name:Katarzyna Kos Address:4 Barlows Landing Road Address Line 2:Unit 15 City:Pocasset State:MA Zip:02559 Email kkos@tighebond.com Phone:3392355614 ▪ January 13, 2023 United States Department of the Interior FISH AND WILDLIFE SERVICE New England Ecological Services Field Office 70 Commercial Street, Suite 300 Concord, NH 03301-5094 Phone: (603) 223-2541 Fax: (603) 223-0104 In Reply Refer To: Project code: 2022-0076627 Project Name: Eversource ERP Staging Yard Subject:Consistency letter for the 'Eversource ERP Staging Yard' project indicating that any take of the northern long-eared bat that may occur as a result of the Action is not prohibited under the ESA Section 4(d) rule adopted for this species at 50 CFR §17.40(o). Dear Katarzyna Kos: The U.S. Fish and Wildlife Service (Service) received on January 13, 2023 your effects determination for the 'Eversource ERP Staging Yard' (the Action) using the northern long-eared bat (Myotis septentrionalis) key within the Information for Planning and Consultation (IPaC) system. You indicated that no Federal agencies are involved in funding or authorizing this Action. This IPaC key assists users in determining whether a non-Federal action may cause “take”[1] of the northern long-eared bat that is prohibited under the Endangered Species Act of 1973 (ESA) (87 Stat.884, as amended; 16 U.S.C. 1531 et seq.). Based upon your IPaC submission, any take of the northern long-eared bat that may occur as a result of the Action is not prohibited under the ESA Section 4(d) rule adopted for this species at 50 CFR §17.40(o). Unless the Service advises you within 30 days of the date of this letter that your IPaC-assisted determination was incorrect, this letter verifies that the Action is not likely to result in unauthorized take of the northern long-eared bat. Please report to our office any changes to the information about the Action that you entered into IPaC, the results of any bat surveys conducted in the Action area, and any dead, injured, or sick northern long-eared bats that are found during Action implementation. If your Action proceeds as described and no additional information about the Action’s effects on species protected under the ESA becomes available, no further coordination with the Service is required with respect to the northern long-eared bat. The IPaC-assisted determination for the northern long-eared bat does not apply to the following ESA-protected species that also may occur in your Action area: Monarch Butterfly Danaus plexippus Candidate 01/13/2023 2 ▪Sandplain Gerardia Agalinis acuta Endangered You may coordinate with our Office to determine whether the Action may cause prohibited take of the animal species listed above. ________________________________________________ [1]Take means to harass, harm, pursue, hunt, shoot, wound, kill, trap, capture, or collect, or to attempt to engage in any such conduct [ESA Section 3(19)]. 01/13/2023 3 Action Description You provided to IPaC the following name and description for the subject Action. 1. Name Eversource ERP Staging Yard 2. Description The following description was provided for the project 'Eversource ERP Staging Yard': Eversource Energy is proposing to construct a staging area on an undeveloped portion of the Yarmouth Work Center. Approximately three acres of forested land will be converted into a paved staging area to be used for storm staging. Approximate location of the project can be viewed in Google Maps: https://www.google.com/ maps/@41.6758769,-70.26339154918367,14z Determination Key Result This non-Federal Action may affect the northern long-eared bat; however, any take of this species that may occur incidental to this Action is not prohibited under the final 4(d) rule at 50 CFR §17.40(o). Determination Key Description: Northern Long-eared Bat 4(d) Rule This key was last updated in IPaC on May 15, 2017. Keys are subject to periodic revision. This key is intended for actions that may affect the threatened northern long-eared bat. The purpose of the key for non-Federal actions is to assist determinations as to whether proposed actions are excepted from take prohibitions under the northern long-eared bat 4(d) rule. If a non-Federal action may cause prohibited take of northern long-eared bats or other ESA-listed animal species, we recommend that you coordinate with the Service. 01/13/2023 4 1. 2. 3. 4. 5. 6. 7. 8. Determination Key Result Based upon your IPaC submission, any take of the northern long-eared bat that may occur as a result of the Action is not prohibited under the ESA Section 4(d) rule adopted for this species at 50 CFR §17.40(o). Qualification Interview Is the action authorized, funded, or being carried out by a Federal agency? No Will your activity purposefully Take northern long-eared bats? No [Semantic] Is the project action area located wholly outside the White-nose Syndrome Zone? Automatically answered No Have you contacted the appropriate agency to determine if your project is near a known hibernaculum or maternity roost tree? Location information for northern long-eared bat hibernacula is generally kept in state Natural Heritage Inventory databases – the availability of this data varies state-by-state. Many states provide online access to their data, either directly by providing maps or by providing the opportunity to make a data request. In some cases, to protect those resources, access to the information may be limited. A web page with links to state Natural Heritage Inventory databases and other sources of information on the locations of northern long- eared bat roost trees and hibernacula is available at www.fws.gov/media/nleb-roost-tree- and-hibernacula-state-specific-data-links-0. Yes Will the action affect a cave or mine where northern long-eared bats are known to hibernate (i.e., hibernaculum) or could it alter the entrance or the environment (physical or other alteration) of a hibernaculum? No Will the action involve Tree Removal? Yes Will the action only remove hazardous trees for the protection of human life or property? No Will the action remove trees within 0.25 miles of a known northern long-eared bat hibernaculum at any time of year? No 01/13/2023 5 9.Will the action remove a known occupied northern long-eared bat maternity roost tree or any trees within 150 feet of a known occupied maternity roost tree from June 1 through July 31? No 01/13/2023 6 Project Questionnaire If the project includes forest conversion, report the appropriate acreages below. Otherwise, type ‘0’ in questions 1-3. 1. Estimated total acres of forest conversion: 3.9 2. If known, estimated acres of forest conversion from April 1 to October 31 0.25 3. If known, estimated acres of forest conversion from June 1 to July 31 0 If the project includes timber harvest, report the appropriate acreages below. Otherwise, type ‘0’ in questions 4-6. 4. Estimated total acres of timber harvest 0 5. If known, estimated acres of timber harvest from April 1 to October 31 0 6. If known, estimated acres of timber harvest from June 1 to July 31 0 If the project includes prescribed fire, report the appropriate acreages below. Otherwise, type ‘0’ in questions 7-9. 7. Estimated total acres of prescribed fire 0 8. If known, estimated acres of prescribed fire from April 1 to October 31 0 9. If known, estimated acres of prescribed fire from June 1 to July 31 0 If the project includes new wind turbines, report the megawatts of wind capacity below. Otherwise, type ‘0’ in question 10. 10. What is the estimated wind capacity (in megawatts) of the new turbine(s)? 0 01/13/2023 7 IPaC User Contact Information Agency:Tighe & Bond Name:Katarzyna Kos Address:4 Barlows Landing Road Address Line 2:Unit 15 City:Pocasset State:MA Zip:02559 Email kkos@tighebond.com Phone:3392355614 Species Determination Table for Endangered Species Project Review (New England Field Office Template) Date: Your Name: Project Name used in IPaC: Project Code (from IPaC): ------------------------------------------------ Directions – (Template version 02/22/2022) 1. Complete these tables using the process outlined on our website: http://fws.gov/office/new-england-ecological-services/endangered-species-project-review 2. The Species Determination Table is used to document determinations, but additional information regarding the action area, project description, potential effects to the species/resource, conservation actions, and how you made your determination is required as part of a Project Review Package if a “may affect” determination is reached. See our website for more information. Notes for Listed Species (Threatened or Endangered) or Proposed Species: • If you determine “No Effect” no further consultation is necessary, and you may use this table for your records. • If you determine “May Affect, not likely to adversely affect,” (NLAA) submit a Project Review Package. • If you determine “May Affect, likely to adversely affect” (LAA), contact us to either initiate formal consultation or initiate discussion on ways to avoid adverse effects. Notes for Candidate Species: • There are no protections for candidate species under the ESA and therefore no requirement for consultation. No section 7 determinations should be made for candidate species. • You may consider implementing voluntary conservation measures if suitable habitat is present or species is known to occur in action area. Notes for Critical Habitat: • Essential physical and biological features (PBFs) can be found in Recovery Plans or federal register notices regarding Critical Habitat designations • If designated Critical Habitat PBFs are not present in the action area, you may determine “No Effect” and no further consultation is necessary. • If designated Critical Habitat PBFs are present in the action area, and you determine “May Affect, not likely to adversely affect,” (NLAA) submit a Project Review Package. • If designated Critical Habitat PBFs are present in the action area and you believe that adverse effects may occur, please contact our office. “Adverse modification” is a direct or indirect alteration that appreciably diminishes the value of critical habitat for the conservation of a listed species. Such alterations may include, but are not limited to, alteration of the physical or biological features essential to the conservation of a species or that preclude or significantly delay development of such features. This determination requires formal consultation with the Service. Listed Species Determination Table Species Name Suitable Habitat Species Presence Conservation Measures Incorporated into Project Determination Notes/Information Add all threatened, endangered, or proposed species from your Official Species List. For Species: Is suitable habitat for listed species present in your action area? “suitable habitat present” “suitable habitat not present” “Don’t know” For Species: Does the species occur in your action area? “Species present” “Species not present” “Don’t know” For Species: If no suitable habitat present: “N/A” -OR- If suitable habitat present: list any conservation measures that will be applied to avoid or minimize effects to species (i.e. time of year restriction, avoid suitable habitat,etc.) Consider all potential effects from the action to threatened or endangered species. For Species: “No effect” “NLAA” “LAA” Explain what info was used to determine presence of suitable habitat and/or species. Threatened Northern Long- eared Bat (Myotis septenrionalis) Suitable habitat not present Note: This bat generally is associated with old-growth forests composed of trees 100 years old or older. It relies on intact interior forest habitat, with low edge-to- interior ratios. Species not present Work will be completed in the winter and spring months which is outside of the nesting period of this species (Late March through October). Additionally, turtle sweeps will be completed in all work areas and any sightings will be reported. Erosion and sedimentation control measures will be implemented to avoid adverse impacts to potential turtle habitat. NLAA This species ecological information was reviewed on NatureServe Explorer to determine that suitable habitat may be present. There are no known records of species in action area. Additionally, an assessment of the FWS determined that no hibernaculum or maternity roost trees are present in the project area. A review of the Massachusetts Natural Heritage and Endangered Species Program spatial data (August 2021) determined that the action area is not within mapped Priority Habitats of Rare Species or Estimated Habitats of Rare Wildlife. Endangered Sandplain Gerardia (Agalinis acuta) Suitable habitat potentially present. Note: Habitat includes dry, sandy, short grass plains, roadsides, and openings in oak scrub. The species is dependent on periodic disturbance that maintains an open habitat. Don’t know Tree clearing will be completed in the winter months as to not disturb the active growing season. Erosion and sedimentation control measures will be implemented to avoid adverse impacts to potential species habitat. NLAA This species ecological information was reviewed on NatureServe Explorer to determine that suitable habitat may be present. There are no known records of species in action area. Additionally, there is no designated critical habitat present in the action area. Two populations were identified in the Cape Cod region. A review of the Massachusetts Natural Heritage and Endangered Species Program spatial data (August 2021) determined that the action area is not within mapped Priority Habitats of Rare Species or Estimated Habitats of Rare Wildlife. Critical Habitat Determination Table (FOR USE ONLY IF OFFICIAL SPECIES LIST INCLUDES CRITICAL HABITAT) Critical Habitat Name Essential Physical and Biological Features (PBF) Presence Conservation Measures Incorporated into Project Determination Notes/Information List all Critical Habitat* from your Official Species List. For Critical Habitat: Do PBFs occur in your action area? “PBFs present” “PBFs not present” For Critical Habitat: If PBFs not present: “N/A” If PBFs are present: list any conservation measures that will be applied to avoid or minimize effects to Critical Habitat For Critical Habitat: Consider all potential effects from the action to Critical Habitat PBF’s. “No effect” “NLAA” “LAA” Explain what info was used to determine presence of Critical Habitat PBF’s. (Find information about PBFs for Critical Habitat in Recovery Plans, federal register notices for Critical Habitat designations etc.) N/A N/A N/A N/A N/A *Critical Habitat refers to officially designated areas, but species may occur anywhere that there is suitable habitat. Candidate Species Table (OPTIONAL) Candidate Species Name Suitable Habitat Species Presence Conservation Measures Incorporated into Project Notes/Information If your Official Species List includes Candidate Species, you may choose to indicate any voluntary conservation measures that will be implemented, however no s7 determinations should be made. For Species: Is suitable habitat for candidate species present in your action area? “suitable habitat present” “suitable habitat not present” “Don’t know” For Species: Does the species occur in your action area? “Species present” “Species not present” “Don’t know” For Species: If no suitable habitat present: “N/A” -OR- If suitable habitat present: list any conservation measures that will be applied to avoid or minimize effects to species (i.e. time of year restriction, avoid suitable habitat, etc.) Explain what info was used to determine presence of suitable habitat and/or species. Monarch butterfly (Danaus plexippus) Drawn Action Area & Overlapping S7 Consultation Areas Area of Interest (AOI) Information Area : 3.99 acres Nov 29 2022 15:32:22 Eastern Standard Time No Section 7 species are located within the project area. Summary Name Count Area(acres)Length(mi) Atlantic Sturgeon 0 0 N/A Shortnose Sturgeon 0 0 N/A Atlantic Salmon 0 0 N/A Sea Turtles 0 0 N/A Atlantic Large Whales 0 0 N/A In or Near Critical Habitat 0 0 N/A APPENDIX M 2022 Construction General Permit (CGP) Page 53 A list of all non-stormwater discharges that occur at the facility, including their source locations and the control measures being used (see Part 1.2.2 of the CGP). Records of sampling and analysis required for construction dewatering and stormwater discharges (see 9.1.1.d above). All required or requested documents must be sent to: NH Department of Environmental Services, Watershed Management Bureau, P.O. Box 95 Concord, NH 03302-0095. 9.1.2 MAR100000 Commonwealth of Massachusetts (except Indian country) All discharges covered by the Construction General Permit shall comply with the provisions pursuant to 314 CMR 3.00, 314 CMR 4.00, 314 CMR 9.00, including applicable construction stormwater standards and 310 CMR 10.00. Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05(5)(e) to maintain surface waters free from pollutants in concentrations or combinations that are toxic to humans, aquatic life, or wildlife, permittees are prohibited from discharging dewatering water under the CGP from sites that are designated as Superfund/CERCLA or RCRA, and must make accommodations to dispose of the dewatering discharges appropriately, such as coverage under the Remediation General Permit (RGP). Pursuant to 314 CMR 3.11 (2)(a), and in accordance with MassDEP’s obligation to protect Outstanding Resource Waters under 314 CMR 4.04(3), applicants seeking coverage under the 2022 CGP that propose to carry out construction activities near Outstanding Resource Waters as identified in 314 CMR 4.06, shall submit to MassDEP for review: a copy of the Stormwater Pollution Prevention Plan (SWPPP), a copy of the EPA NOI, and MassDEP’s Stormwater BMP Checklist. For purposes of this review, the permittee shall submit these documents to MassDEP at the same time they are submitted to EPA. Instructions on how to submit these documents to MassDEP and where to find the MassDEP Stormwater BMP Checklist and obtain authorization to discharge can be found here: https://www.mass.gov/how-to/wm-15-npdes-general-permit- notice-of- intent. Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05(5)(e) to maintain surface waters free from pollutants in concentrations or combinations that are toxic to humans, aquatic life, or wildlife, applicants that propose to dewater under the 2022 CGP and plan to discharge to certain waters as described below, shall determine that any dewatering discharges are not contaminated by testing the proposed discharge as described below as part of the application for WM15 authorization. Unless otherwise specified, testing described in this section should be conducted using the methods in 40 CFR 136. Applicants for sites that plan to discharge to Outstanding Resource Waters as identified in 314 CMR 4.06 shall test one sample of the proposed dewatering discharge water for pH, E. Coli (for discharges to freshwater), fecal coliform (for 2022 Construction General Permit (CGP) Page 54 discharges to salt water), Enterococci (for discharges to salt water), total suspended solids, oil and grease, total nitrogen, total phosphorus, and all parameters with numeric criteria listed in the Massachusetts Surface Water Quality Standards at 314 CMR 4.05(e). Results shall be reported to MassDEP as part of the WM15 application. To determine if the dewatering discharge could be covered under the 2022 CGP, the effluent at zero dilution must meet numeric water quality criteria. If the effluent does not meet numeric water quality criteria, the applicant shall contact EPA Region 1 to discuss coverage under the Remediation General Permit. Applicants for sites that propose to discharge to Public Water Supplies (314 CMR 4.06(1)(d)1) shall also test one sample of the proposed dewatering discharge water for per- and polyfluoroalkyl substances (PFAS), as outlined in the table below. Results shall be reported to MassDEP as part of the WM15 application. If any PFAS compounds are detected, the applicant shall apply for coverage under the NPDES Remediation General Permit for Massachusetts if required. PFAS Testing Parameters for Discharges to Public Drinking Water Supplies 99 Perfluorohexanesulfonic acid (PFHxS), grab Report ng/L Perfluoroheptanoic acid (PFHpA), grab Report ng/L Perfluorononanoic acid (PFNA), grab Report ng/L Perfluorooctanesulfonic acid (PFOS), grab Report ng/L Perfluorooctanoic acid (PFOA), grab Report ng/L Perfluorodecanoic acid (PFDA), grab Report ng/L 99 PFAS testing shall follow established EPA methods 537 or 537.1 for drinking water until EPA Method 3512 for non- potable water becomes available. Applicants for sites that propose to discharge to an impaired water as identified in the most recent final Massachusetts Integrated List of Waters, shall test one sample of the proposed dewatering discharge water for the parameter(s) for which the waterbody is impaired. To determine if the dewatering discharge could be covered under the 2022 CGP, the effluent at zero dilution must meet numeric water quality criteria. If the effluent does not meet numeric water quality criteria, the applicant shall contact EPA Region 1 to discuss coverage under the Remediation General Permit and shall apply for RGP coverage if required. For dewatering discharges to all other waters, if any pollutants are known or believed present in the proposed dewatering discharge water, the applicant shall apply for coverage under the NPDES Remediation General Permit for Massachusetts if required. For the purposes of this condition, a pollutant is “known present” if measured above the analytical detection limit using a sufficiently sensitive test method in an environmental sample, and “believed present” if a pollutant has not been measured in an environmental sample but will be added or generated prior to discharge, such as through a treatment process. Consequently, a pollutant is “known absent” if measured as non-detect relative to the analytical detection limit using a sufficiently sensitive test method in an environmental sample, and “believed absent” if a pollutant has not been measured in an environmental sample but will not be added or generated prior to discharge and is not a parameter that applies to the applicable activity category for a site. If any pollutants are known or believed present in the 2022 Construction General Permit (CGP) Page 55 proposed dewatering discharge water, the applicant shall test one sample of the proposed dewatering discharge water for the pollutants known or believed to be present. To determine if the dewatering discharge could be covered under the 2022 CGP, the effluent at zero dilution must meet numeric water quality criteria. If the effluent does not meet numeric water quality criteria, the applicant shall contact EPA Region 1 to discuss coverage under the Remediation General Permit. Pursuant to 314 CMR 3.11 (2)(a), and in accordance with MassDEP’s obligation to protect Outstanding Resource Waters under 314 CMR 4.04(3), applicants that propose to dewater under the 2022 CGP and discharge to Outstanding Resource Waters as identified in 314 CMR 4.06, shall submit the SWPPP and associated documents to MassDEP to review. MassDEP shall complete review within 30 days of receipt. Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05 to maintain surface waters free from color and turbidity in concentrations or combinations that are aesthetically objectionable or would impair any use assigned to the waterbody, permittees that have been authorized to dewater under the 2022 CGP and that discharge to Outstanding Resource Waters as identified in 314 CMR 4.06 shall carry out daily benchmark monitoring for turbidity 100 for the duration of dewatering. Permittees shall compare the weekly average of the turbidity monitoring results with the established benchmark turbidity value of 25 Nephelometric Turbidity Units (NTU). If a permittee’s weekly average turbidity results exceed the benchmark, the operator shall conduct follow-up corrective action to determine the source of the problem and to make any necessary repairs or upgrades to the dewatering controls to lower the turbidity levels. The permittee shall document any corrective action taken in its corrective action log. Furthermore, permittees at these sites shall carry out inspections at higher frequency, specifically, daily inspections of the dewatering discharge treatment for the duration of the discharge. The permittee shall inspect the site for sediment plume or whether a hydrocarbon sheen is visible at the point of discharge, estimate the flow rate at the point of discharge, and inspect the site downstream to assess whether sedimentation is attributable to the dewatering discharges. 100 Applicants shall follow EPA Method 180.1 to monitor for turbidity Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05 to maintain surface waters free from color and turbidity in concentrations or combinations that are aesthetically objectionable or would impair any use assigned to the waterbody, permittees shall store materials outside the Base Flood Elevation 101 when feasible to prevent displacing runoff and erosion. 101 Base Flood Elevation (BFE) is the elevation of surface water resulting from a flood that has a 1% chance of equaling or exceeding that level in any given year. The BFE is shown on the Flood Insurance Rate Map (FIRM) for zones AE, AH, A1–A30, AR, AR/A, AR/AE, AR/A1– A30, AR/AH, AR/AO, V1–V30 and VE. (Source: https://www.fema.gov/node/404233). Pursuant to 314 CMR 3.11 (2)(a), and in accordance with MassDEP’s obligation to maintain surface waters free from nutrients in concentrations that would cause or contribute to impairment of existing or designated uses under 314 CMR 4.05(5)(c), all applicants who apply for coverage under the 2022 CGP shall follow guidelines on fertilizer application, including use of fertilizer containing no phosphorus, in accordance with 330 CMR 31.00 Plant Nutrient Application Requirements for 2022 Construction General Permit (CGP) Page 56 Agricultural Land and Non-Agricultural Turf and Lawns. Further, fertilizer shall never be applied to a site when a rain event greater than 0.5 inches is forecast in the next 48 hours. Pursuant to 314 CMR 3.11 (2)(a), all applicants who apply for coverage under the 2022 CGP and elect to carry out site inspections every 14 days shall also inspect sites within 24 hours of 0.25 inches of precipitation events or greater over 24 hours, or within 24 hours of a discharge that occurred due to snowmelt from 3.25 inches or greater of snow accumulation.102 During the high flow periods in spring (i.e., months of April to June), inspection frequency shall be increased to once per week for all sites. 102 This is the amount of snow that is equivalent to 0.25 inches of rain, based on information from the National Oceanic and Atmospheric Administration (NOAA) indicating that 13 inches of snow is, on average, equivalent to 1 inch of rain. See https://www.nssl.noaa.gov/education/svrwx101/winter/faq/. To determine whether 3.25 inches or greater of snow accumulation has occurred at a site, snowfall measurements can be taken at the site,103 or the operator can rely on similar information from a local weather forecast. 103 NOAA’s National Weather Service has guidelines on snowfall measurements at https://www.weather.gov/jkl/snow_measurement. These guidelines recommend use of a “snowboard” (a piece of wood about 16 inches by 16 inches) that is placed in an unobstructed part of the site on a hard surface. Implementing structural improvements, enhanced/resilient pollution prevention measures, and other mitigation measures can help to minimize impacts from stormwater discharges from major storm events such as hurricanes, storm surge, extreme/heavy precipitation,104 and flood events. Pursuant to 314 CMR 3.11 (2)(a), if such stormwater control measures are already in place due to existing requirements mandated by other state, local or federal agencies, the SWPPP shall include a brief description of the controls and a reference to the existing requirement(s). If the site may be exposed to or has previously experienced such major storm events 105, additional stormwater control measures that may be considered, and implemented as necessary, include, but are not limited to: 104 Heavy precipitation refers to instances during which the amount of rain or snow experienced in a location substantially exceeds what is normal. What constitutes a period of heavy precipitation varies according to location and season. Heavy precipitation does not necessarily mean the total amount of precipitation at a location has increased— just that precipitation is occurring in more intense or more frequent events. 105 To determine if your facility is susceptible to an increased frequency of major storm events that could impact the discharge of pollutants in stormwater, you may reference FEMA, NOAA, or USGS flood map products at https://www.usgs.gov/faqs/where-can-i-find-flood-maps?qt- news_science_products=0#qtnews_science_products. Reinforce materials storage structures to withstand flooding and additional exertion of force; Prevent floating of semi-stationary structures by elevating to the Base Flood Elevation (BFE) level or securing with non-corrosive device; When a delivery of exposed materials is expected, and a storm is anticipated within 48 hours, delay delivery until after the storm or store materials as appropriate (refer to emergency procedures); 2022 Construction General Permit (CGP) Page 57 Temporarily store materials and waste above the Base Flood Elevation [EPA notes that it has deleted a footnote reference to the term “Base Flood Elevation” since the same footnote is already included in Part 9.1.2.g, above.] level; Temporarily reduce or eliminate outdoor storage; Temporarily relocate any mobile vehicles and equipment to higher ground; Develop scenario-based emergency procedures for major storms that are complementary to regular stormwater pollution prevention planning and identify emergency contacts for staff and contractors; and Conduct staff training for implementing your emergency procedures at regular intervals. Pursuant to 314 CMR 3.11 (2)(a)6., and in accordance with MassDEP’s obligation under 314 CMR 4.05(5)(e) to maintain surface waters free from pollutants in concentrations or combinations that are toxic to humans, aquatic life, or wildlife, permittees who seek coverage under the 2022 CGP and anticipate to carry out dust control shall limit their dust control methodology to using water only and specifically avoid using other techniques, such as solutions containing calcium chloride. If MassDEP requests a copy of the Stormwater Pollution Prevention Plan (SWPPP) for any construction site at any time, the permittee shall submit the SWPPP to MassDEP within 14 days of such a request. MassDEP may conduct an inspection of any site covered by this permit to ensure compliance with state law requirements, including state water quality standards. 9.1.3 MTR10F000 Areas in the State of Vermont located at a federal facility Earth disturbance at any one time is limited to five acres. All areas of earth disturbance must have temporary or final stabilization within 14 days of the initial disturbance. After this time, disturbed areas must be temporarily or permanently stabilized in advance of any runoff producing event. A runoff producing event is an event that produces runoff from the construction site. Temporary stabilization is not required if precipitation is not forecast and work is to continue in the next 24-hours or if the work is occurring in a self-contained excavation (i.e. no outlet) with a depth of two feet or greater (e.g. house foundation excavation, utility trenches). Areas of a construction site that drain to sediment basins are not considered eligible for this exemption, and the exemption applies only to the excavated area itself. Site inspections on active construction sites shall be conducted daily during the period from October 15 through April 15. The use of chemical treatments (e.g. polymers, flocculants, and coagulants) for the settling and/or removal of sediment from stormwater runoff associated with construction and construction-related activities requires prior written approval and an approved site and project-specific plan, from the Vermont Agency of Natural Resources. In addition, the use of cationic polymers is prohibited unless approved by the Vermont Agency of Natural Resources under a site and project-specific plan. Any applicant under EPA’s CGP shall allow authorized Vermont Agency of Natural Resources representatives, at reasonable times and upon presentation of credentials, to enter upon the project site for purposes of inspecting the project and determining APPENDIX N APPENDIX O Best Management Practices Manual for Massachusetts and Connecticut APRIL 2022 Prepared for: Eversource Energy Environmental Licensing and Permitting Group CONSTRUCTION & MAINTENANCE ENVIRONMENTAL REQUIREMENTS TABLE OF CONTENTS Table of Contents i Section 1 Introduction 1.1 Purpose ........................................................................................1-1 1.2 Scope and Applicability ...................................................................1-1 1.3 Definitions .....................................................................................1-1 1.4 Acronyms and Abbreviations ............................................................1-4 1.5 BMP References .............................................................................1-5 Section 2 Project Planning 2.1 Regulated Areas .............................................................................2-1 2.1.1 Types of Wetlands ................................................................ 2-1 2.1.2 Rare Species........................................................................ 2-2 2.1.3 Historical/Cultural ................................................................ 2-3 2.2 Meetings .......................................................................................2-3 2.3 Site Staging and Parking .................................................................2-3 2.4 Construction Monitoring ..................................................................2-3 2.5 Signage/Limit of Boundaries ............................................................2-3 Section 3 Construction Considerations 3.1 Avoidance and Minimization .............................................................3-1 3.2 Rare Species Habitat ......................................................................3-1 3.3 Hiking Trails ..................................................................................3-2 3.4 Work on State-owned land in Connecticut .........................................3-3 3.5 Historic/Cultural Resources ..............................................................3-3 3.5.1 Stone Walls ......................................................................... 3-3 3.5.2 Unanticipated Discoveries ...................................................... 3-5 3.6 Human Remains .............................................................................3-5 3.7 Vernal Pools ..................................................................................3-5 3.7.1 Certified Vernal Pools (MA) .................................................... 3-6 3.8 Access Roads .................................................................................3-6 3.8.1 New Access Roads ................................................................ 3-7 3.8.2 Existing Access Roads ........................................................... 3-7 3.8.3 Best Management Practices – New Access Roads ...................... 3-9 3.8.4 Construction in Wetlands ..................................................... 3-15 3.8.5 Watercourse Crossings ........................................................ 3-20 3.9 Slope Excavation .......................................................................... 3-24 3.10 Vegetation Removal and Preservation ............................................. 3-24 3.10.1 ROW Vegetation and Eastern Box Turtle (EBT) – MA only ........ 3-25 3.10.2 ROW Vegetation and Other Protected Turtles ......................... 3-25 3.10.3 Preservation of Existing Vegetation ....................................... 3-27 Table of Contents ii 3.10.4 Invasive Plant Species ........................................................ 3-27 3.11 Work Pads ................................................................................... 3-32 3.11.1 De-Energized and Energized ................................................ 3-32 3.12 Structure-Related Work ................................................................ 3-33 3.12.1 Wetland ............................................................................ 3-33 3.13 Underground Cable and Gas Piping-Related Work ............................. 3-36 3.14 Construction Material along the ROW .............................................. 3-38 3.15 Winter Construction ...................................................................... 3-38 3.15.1 Snow Management ............................................................. 3-38 3.15.2 De-Icing ............................................................................ 3-39 3.15.3 Snow and Ice Management on Construction Mats ................... 3-39 3.16 Dust Control ................................................................................ 3-39 3.16.1 Soil Stockpile Management .................................................. 3-40 3.16.2 Stockpiles on Construction Mats ........................................... 3-40 3.16.3 Regulated Soils Management ............................................... 3-40 3.16.4 Best Management Practices – Soil Stockpile Management ........ 3-41 3.17 Anti-Idling Laws ........................................................................... 3-41 3.17.1 Connecticut ....................................................................... 3-41 3.17.2 Massachusetts ................................................................... 3-41 Section 4 Inspection and Maintenance 4.1 During Construction ........................................................................4-1 4.1.1 Maintenance of Erosion and Sedimentation Controls ................. 4-1 4.1.2 Rapid Wetland Response Restoration ...................................... 4-1 4.1.3 Vehicle Storage and Refueling ................................................ 4-1 4.1.4 Spills .................................................................................. 4-2 4.1.5 Post-Construction ................................................................. 4-2 Section 5 Rehabilitation and Restoration 5.1 Restoration ....................................................................................5-1 5.1.1 Seed Mixes .......................................................................... 5-1 5.1.2 Upland ................................................................................ 5-1 5.1.3 Wetland/Watercourses .......................................................... 5-2 5.2 Private Property .............................................................................5-3 5.2.1 Improved Areas ................................................................... 5-3 5.2.2 Overall Work Site ................................................................. 5-3 5.2.3 Material Storage/Staging and Parking Areas ............................ 5-3 5.3 Work in Agricultural Lands ...............................................................5-4 Table of Contents iii Appendices A BMP Typical Details Construction A01 Construction Entrance Track Pad A02 Water Bars A03 Vegetated Swales A04 AlturnaMAT® A05 Construction Mat (Wetland Crossing) A06 Construction Mat (Air Bridge) A07 Construction Mat Anchoring A08 Permeable Road A09 Temporary Construction Culvert A10 Permanent Open Bottom Box Culvert A11 Arch Culvert A12 Pole Ford A13 Construction Mat Work Pad (Live Line Work) A14 Construction Mat Work Pad (De-Energized Line Work) A15 Concrete Wash Out A16 Road Trench (Duct Bank) A17 Road Trench (6-Way Duct Bank) A18 Tree Protection Soil Stockpile Management A19 Soil Stockpile Management Erosion / Sedimentation Controls A20 Topsoil Segregation A21 Straw Bale Barrier A22 Silt Fence A23 Syncopated Silt Fence A24 Reinforced Silt Fence Table of Contents iv A25 Erosion Control Blankets A26 Straw Wattle / Mulch Log A27 Straw Wattle (on Slope) A28 Compost Filter Tube A29 Turbidity Curtain A30 Catch Basin Inlet Protection (Straw Bales) A31 Catch Basin Inlet Protection (Silt Sack) A32 Loam and Seed A33 Straw Mulch A34 Coir Log A35 Level Spreader A36 Check Dams A37 Trench Breakers Water Control A38 Sediment Trap A39 Dewatering Basin A40 Dewatering Basin (Filter Bag) A41 Dewatering Basin (Frac Tank) A42 Coffer Dam and Stream Flow Bypass (gravity) A43 Coffer Dam and Stream Flow Bypass (pumping) B Applicable Regulations in Connecticut C Applicable Regulations in Massachusetts D Example Frac-Out Plan SECTION 1 Eversource Best Management Practices Manual 1-1 Section 1 Introduction 1.1 Purpose As a matter of Eversource Energy (herein, “Eversource”) policy with regard to environmental stewardship and in accordance with local, state, and federal regulations, all construction and maintenance projects shall use environmentally sound best management practices (BMPs) to minimize or eliminate environmental impacts that may result from construction activities. Regardless of whether a specific permit is needed for the work, construction and maintenance projects must f ollow internal environmental performance standards, which is the purpose of these BMPs. In many cases, maintenance activities are exempt from regulatory authorization. Permits are usually required for new work. Contractors will be provided with copies of any project- specific permits and will be required to adhere to any and all conditions of the permit(s). Project-specific permit conditions may supersede the BMPs outlined in this manual. However, where certain construction elements are not addressed by per mit conditions, or where permitting is not required, or for emergency situations where obtaining a permit before the work occurs may not be feasible, these BMPs shall be considered as Eversource’s standards. In some cases, and at the discretion of the Eversource Environmental Licensing and Permitting staff, the BMPs presented herein may be modified to be more appropriate for site-specific conditions. 1.2 Scope and Applicability These BMPs primarily address the disturbance of soil, water, and vegetation incidental t o construction within on- and off-road utility corridors, substations, including the establishment of access roads and work areas, within rights of way (ROWs) and on private property, in and near wetlands, watercourses, or other sensitive natural areas (such as protected species), including storm drain systems (e.g., catch basins). Types of construction include, but are not limited to, installation or maintenance of underground and overhead utilities, access road repair/improvement or construction, and upgrades or maintenance of substations and other facilities. Other common construction issues such as noise, air pollution, oil spill procedures, handling of contaminated soils, and work safety rules are addressed in the Eversource Energy Contractor Work Rules and related appendices. 1.3 Definitions The following definitions are provided to clarify use of common terms throughout this document. Best Management Practice (BMP): A means to reduce and minimize impact to natural resources. Casing: A galvanized steel corrugated pipe that serves as the form for a utility structure foundation. Section 1 Introduction Eversource Best Management Practices Manual 1-2 Emergency Projects: Actions needed to maintain the operational integrity of the system or activities necessary to restore the system and affected facilities in response to a sudden and unexpected loss of electric or gas service or events that affect public health and safety. Embedded Culvert: A culvert that is installed in such a way that the bottom of the structure is below the stream bed and there is substrate in the culvert. Environmentally Sensitive Areas: An area containing natural features, cultural resources, or ecological functions of such significance to warrant protection. Some examples are rivers, streams, ponds, lakes, wetlands, rare species habitat, water supply protection areas, archaeological sites, parks, and agricultural land. Erosion Control: A measure to prevent soil from detachment and transportation by water, wind, or gravity. Existing Access Roads: Previously permitted or grandfathered access roads that are used to access structures that are clearly visible or can be found by mowing or by the presence of road materials in soil cores. Grubbing: A site preparation method that is used to clear the ground of roots and stumps. Intermittent Watercourse: An intermittent watercourse, or stream, is broadly defined as a channel that a flowing body of water follows at irregular intervals and does not have continuous or steady flow. Regulatory definitions for intermittent watercourses are: • Connecticut – Per the Connecticut Inland Wetland and Watercourses Act, intermittent watercourses are delineated by a defined permanent channel and bank and the occurrence of two or more of the following characteristics: (A) Evidence of scour or deposits of recent alluvium or detritus, (B) the presence of standing or flowing water for a duration longer than a particular storm incident, and (C) the presence of hydrophytic vegetation. • Massachusetts – Under the Massachusetts Wetlands Protection Act (MAWPA), a jurisdictional intermittent watercourse is defined as a body of running water which moves in a definite channel in the ground due to a hydraulic gradient, does not flow throughout the year, and which flows within, into or out of an area subject to protection under the MAWPA. Intermittent watercourses upgradient of any Bordering Vegetated Wetlands or Ponds are not jurisdictional under the MAWPA. A watercourse can be determined to be intermittent if it me ets MAWPA criteria with regard to its depiction on the most current USGS topographic map of the area (i.e., shown as intermittent or not shown), and watershed size and predicted flow rates as determined by the USGS StreamStats method or documented observations of no flow at least once per day over the course of four days in any consecutive 12 - month period barring drought conditions, withdrawals, or other human-made flow reductions or diversions (subject to conservation commission and/or M assDEP review and approval). Limit of Work/Disturbance: The boundaries of the approved project within regulated areas. All project related activities in regulated areas must be conducted within the approved limit of work/disturbance. The limit of work/disturbance should be depicted on the approved permit site plans, which may require the limits to be survey located and identified in the field by flagging, construction fencing, and/or perimeter erosion controls. Low Ground Pressure Vehicle: Vehicles that have a lesser impact on an environmentally sensitive area due to the vehicle being smaller, lighter, or different in another way than a vehicle which would have a greater impact. Low ground pressure is Section 1 Introduction Eversource Best Management Practices Manual 1-3 measured in pounds per square inch (psi) when loaded and as defined by the US Army Corps of Engineers (ACOE). CT = < 3 psi MA = < 3 psi Low impact vehicles could include off -road vehicles (ORVs) or all-terrain vehicles/ utility vehicles (ATVs/UTVs), tracked vehicles with low ground pressure, or vehicles with oversized balloon-type tires. Maintenance Projects: Typically consist of activities limited to the repair and/or replacement of existing and lawfully located utility structures and/or facilities where no substantial change in the original structure or footprint is proposed. Maintenance activities also include vegetation management. Minimization: Causing as little disturbance to an area as practicable during construction. New Construction: Construction of new transmission or distribution facilities that previously did not exist or construction that substantially modifies existing facilities. All new (and existing) construction projects are required to go through a full permit review by Eversource Environmental Licensing and Permitting. Pre-Construction Notification (PCN): Project activities that do not qualify for Self- Verification (SV) or where otherwise required by the terms of the Massachusetts (MA) and Connecticut (CT) General Permits (GPs) must submit a PCN and obtain written verification before starting work in ACOE jurisdiction. Refer to MA and CT GP s for PCN thresholds. Projects that cannot be completed under a PCN must file for an Individual Permit with the ACOE. In CT, for coastal projects, notification is provided to ACOE by the CT Department of Energy and Environmental Protection (CT DEEP), Office of Long Island Sound Programs (OLISP) or by applicants as necessary. Written approval from ACOE is required. Protected Species: Species named and protected under the Massachusetts Endangered Species Act (MESA) regulations and/or the Connecticut Endangered Species Act (C.G.S. §§ 26-303 through 26-315). Rare Species: See Protected Species. Restoration: To return a disturbed area to its former, original or unimpaired condition. A site is considered fully restored when it has returned (as closely as practicable) to its original state. Restoration of disturbed areas should occur as soon as practicable following the completion of activities at that location. Revegetation: Establishment of plant material for temporary or permanent soil stabilization. Right of Way (ROW): A pathway, road, or corridor of land where Eversource has legal rights (either fee ownership, lease, or easement) to construct, operate, and main tain an electric power line and/or natural gas pipeline. Sediment Control: The practice of managing the erosion of soil materials mobilized by water, typically stormwater runoff, on-site for the purpose of protecting nearby wetland and water resources. Self-Verification (SV): Activities that are eligible for SV are authorized under the MA and CT GPs and may commence without written verification from the ACOE provided the prospective permittee has: i. Confirmed that the activity will meet the terms and conditions of applicable MA and CT GPs. Section 1 Introduction Eversource Best Management Practices Manual 1-4 ii. Submitted the Self-Verification Notification Form (SVNF) to the ACOE. In CT, coastal projects do not require filing of a SVNF. ACOE relies on CT DEEP submittals. Sensitive Environmental Area: For the purposes of this BMP Manual, this term shall be inclusive of all wetlands, streams, waterways, waterbodies, buffer zones, rare species habitat, and historical/cultural resources. Stabilization: A system of permanent or temporary measures used alone or in combination to minimize erosion from disturbed areas. Work: For the purposes of this BMP Manual, any form of temporary or permanent draining, dumping, damming, discharging, excavating, filling or grading; the erection, reconstruction, replacement or expansion of any buildings or structures; the driving of piles; the construction or improvement of roads and other ways; the changing of run -off characteristics; the intercepting or diverging of ground or surface water; the installation of storm drain systems (e.g., catch basins); the discharging of pollutants; the destruction of plant life; and any other changing of the physical characteristics of land including, but not limited to: on- and off-road utility corridors and substations. Types of work include but are not limited to the installation or maintenance of underground and overhead utilities, substations and other facilities. 1.4 Acronyms and Abbreviations The following acronyms and abbreviated are provided to clarify use of common terms throughout this document. All-terrain Vehicle ATV Best Management Practice BMP Certified Vernal Pool CVP Connecticut CT Connecticut Department of En ergy & Environmental Protection CT DEEP Connecticut Department of Transportation ConnDOT Connecticut General Statute Conn. Gen. Stat. Cross-Linked Polyethylene XLPE Eastern Box Turtle EBT Environmental Affairs Department EAD Eversource Energy Eversource General Permits GPs Geographic Information System GIS High-Pressure Fluid-Filled HPFF Horizontal Directional Drilling HDD Kilovolt kV Massachusetts MA Massachusetts Department of Agriculture MA DAR Massachusetts Department of Conservation and Recreation MA DCR Section 1 Introduction Eversource Best Management Practices Manual 1-5 Massachusetts Department of Environmental Protection MassDEP Massachusetts Endangered Species Act MESA Massachusetts Wetlands Protection Act MAWPA Massachusetts General Law M.G.L. Natural Diversity Database NDDB Natural Heritage and Endangered Species Program NHESP New England Cottontail NEC Off-Road Vehicle ORV Outstanding Resource Water ORW Pounds per Square Inch psi Pre-Construction Notification PCN Right of Way ROW Self-Verification SV Self-Verification Notification Form SVNF Species spp. Time of Year TOY United States U.S. United States Army Corps of Engineers ACOE United States Department of Agriculture USDA United States Geologic Survey USGS Utility Vehicle UTV Vegetation Management Plan VMP 1.5 BMP References The following table lists the public guidance documents utilized during the preparation of this BMP manual. Refer to these documents for additional information. BMP References General Best Management Practices (BMPs) Manual for Access Road Crossings of Wetlands and Waterbodies, EPRI, Palo Alto, CA (2002) 1005188. Gas Research Institute. Horizontal Directional Drilling Best Management Practices Manual (2002) ENSR Corporation, Westford, MA and Trenchless Engineering Corp., Houston, TX. Connecticut Connecticut Department of Transportation (ConnDOT). ConnDOT Drainage Manual (October 2000) http://www.ct.gov/dot/cwp/view.asp?a=1385&Q=260116 Section 1 Introduction Eversource Best Management Practices Manual 1-6 BMP References Connecticut Standard Specifications for Roads, Bridges and Incidental Construction, FORM 816 (2004) http://www.ct.gov/dot/cwp/view.asp?a=3609&q=430362 Connecticut Department of Energy & Environmental Protection. Connecticut Guidelines for Erosion and Sediment Control. (2002) http://www.ct.gov/deep/cwp/view.asp?a=2720&q=325660&deepNav_GID=1654%20 Connecticut Department of Energy & Environmental Protection, Bureau of Natural Resources, Division of Forestry. Best Management Practices for Water Quality While Harvesting Forest Products (2012) https://portal.ct.gov/- /media/DEEP/forestry/best_management_practices/BestPracticesManualpdf.pdf Regulations of Connecticut State Agencies (RCSA). Control of Particulate Matter and Visible Emissions. Section 22a-174-18. https://eregulations.ct.gov/eRegsPortal/Browse/RCSA/Title_22aSubtitle_22a - 174Section_22a-174-18/ Massachusetts Commonwealth of Massachusetts Department of Public Works Standard Specifications for Highways and Bridges (2020) https://www.mass.gov/doc/2020-standard-specifications-for-highways-and- bridges/download Massachusetts River and Stream Crossing Standards (Revised March 1, 2011) https://www.nae.usace.army.mil/Portals/74/docs/regulatory/StreamRiverContinuity/MA_RiverStrea mCrossingStandards.pdf Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas. Original Print: March 1997. Reprint: May 2003. https://www.mass.gov/doc/complete- erosion-and-sedimentation-control-guidelines-a-guide-for-planners-designers-and/download The Massachusetts Unpaved Roads BMP Manual (Winter 2001) https://www.mass.gov/doc/unpaved-roads-bmp-manual/download The Massachusetts Anti-Idling Law. M.G.L. Chapter 90, Section 16A and 310 CMR 7.11. https://www.mass.gov/doc/massdep-faq-the-massachusetts-anti-idling-law/download SECTION 2 Eversource Best Management Practices Manual 2-1 Section 2 Project Planning After undergoing an initial screening review by the department conducting the proposed project, if sensitive environmental areas are identified, the project is required to go through a permit review by Eversource Environmental Licensing and Permitting. The permit review process is supported by Geographic Information Systems (GIS) or a similar program that references the most current spatial data for the project areas in question. Through the GIS review process various geo-processing tools are used to compose maps and provide a spatial reference to environmentally sensitive areas. In consultation with Eversource Environmental Licensing and Permitting, the Project Engineer, permitting specialist, or other project planner should determine regulatory jurisdiction and which (if any) environmental permits or approvals are required before starting any project. Questions regarding which activities may be conducted in regulated areas or within environmentally sensitive areas should be referred to Eversource Environmental Licensing and Permitting. Summaries of potentially applicable laws and regulations are provided in Appendices B and C of this document. Eversource employs a best practice mitigation hierarchy to 1) avoid environmental impacts wherever possible, followed by 2) minimization of environmental impacts where they cannot be avoided, and 3) mitigating and restoring any environmental impacts where necessary. 2.1 Regulated Areas 2.1.1 Types of Wetlands Wetland areas common to New England and common to both Connecticut and Massachusetts include, but are not limited to, the following: Forested Wetlands Forested wetlands are wetlands that ar e dominated by trees that are 20 feet or taller. These wetlands are typically drier with standing water typically occurring during periods of high precipitation, seasonally high groundwater, snowmelt, and runoff (e.g., early spring through mid-summer). Tree species typical of this type of wetland include red maple (Acer rubrum) and eastern hemlock (Tsuga canadensis). “Pit and mound” topography is common in forested wetlands, where mature trees grow on the higher and drier mounds and obligate wetland species are found in the lower pits. Scrub-Shrub Wetlands Scrub-shrub wetlands are dominated by woody vegetation less than 20 feet tall and may include peat bogs. Typical bog species include leatherleaf (Chamaedaphne calyculata), cotton grasses (Eriophorum sp.), cranberry (Vaccinium macrocarpon, V. oxycoccus), and black spruce (Picea mariana). Other non-bog scrub-shrub wetlands are characterized by buttonbush (Cephalanthus occidentalis), alders (Alnus spp.), dogwoods (Swida spp.), and arrowwoods (Viburnum spp.). Section 2 Project Planning Eversource Best Management Practices Manual 2-2 Marshes Marshes are dominated by erect, herbaceous vegetation and appear as grasslands or stands of reedy growth. These wetlands are commonly referred to by a host of terms, including marsh, wet meadow, or fen. These areas are flooded all or most of the year and, in New England, tend to be dominated by cattails (Typha spp.). Wet Meadows Typical wet meadow species include grasses such as bluejoint (Calamagrostis canadensis) and reed canary grass (Phalaris arundinacea), sedges (Carex spp.) and rushes (Juncus spp.), and various other forbs such as Joe-Pye-weeds (Eutrochium spp.) and asters (Aster spp.). Floodplains A floodplain is generally defined as an area of low-lying ground adjacent to a stream or river that is formed mainly of river sediments and is subject to inundation from floodwaters. State-specific regulatory definitions vary and are described as follows: • In Connecticut, areas that contain alluvial or floodplain soils are regulated as wetlands. These areas may flood so infrequently or be so freely drained that hydrophytic vegetation and hydric soils are not present. Soils in these areas must be examined carefully to determine whether well drained alluvial or floodplain soils are present. • In Massachusetts, a floodplain is a type of wetland resource area that floods following storms, prolonged rainfall, or snowmelt. There are three types of floodplain areas protected under the MAWPA: coastal areas, areas bordering rivers and streams, and isolated depressions that flood at least once a year. Streams A stream is any natural flowing body of water that empties to any ocean, lake, pond or other river. Perennial streams, or rivers, have flows throughout the year. Intermittent streams do not have surface flows throughout the year, though surface water may remain in isolated pockets. Vernal Pools Vernal pools are typically contained basin depressions lacking permanent aboveground outlets. These areas fill with water with the rising water table of fall and winter and/or with the meltwater and runoff of winter and spring snow and rain. The pools contain water for a few months in the spring and early summer. Due to periodic drying cycles, vernal pools do not support breeding fish populations and can thus serve as breeding grounds for a variety of organisms, including some rare and/or protected species of frogs and salamanders. 2.1.2 Rare Species Utility ROWs within Connecticut and Massachusetts overlap with, and in some circumstances create or enhance, habitat of rare/protected species of plants, vertebrate and invertebrate animals. Special requirements may need to be evaluated as part of new construction and/or some maintenance activities. Section 2 Project Planning Eversource Best Management Practices Manual 2-3 2.1.3 Historical/Cultural Other regulated factors taken into consideration during the project planning process include the presence of protected (i.e., threatened or endangered) specie s, non- native, invasive plant species and/or historical/cultural resources. Special requirements may need to be evaluated as part of new construction and/or some maintenance activities. 2.2 Meetings A pre-construction meeting is typically held prior to the commencement of all work with the purpose to appoint responsible parties, discuss timing of work, and further consider options to avoid and/or minimize disturbance to sensitive areas. The meeting confirms that there is consensus on work methods and responsibilities and ensure s that tasks will be fulfilled with as little disturbance to the environment as practicable. These meetings can occur on or off-site and should include all the applicable stakeholders (i.e., Eversource, contractors, consultants, inspectors and/or monitors, and regulatory agency personnel). A short and less formal briefing should suffice for smaller maintenance projects. 2.3 Site Staging and Parking During the project planning and permitting process, locations should be identified for designated crew parking areas, material storage, and staging areas. Where possible, these areas should be located outside of buffer zones, watershed protection areas, and other environmentally sensitive areas. Any proposed locations should be evaluated for all sensitive receptors and for new projects requiring permitting, should be incorporated onto permitting and access plans. 2.4 Construction Monitoring Construction projects require environmental monitoring, which can be conducted either internally or by consultants. Some permitted projects require oversight by designated and pre-approved compliance monitors. Environmental monitoring is a way to keep a chronological record of pre-construction site conditions, progress, and changes that are made, as well as to document issues and authorized solutions. If work will occur in a sensitive environmental area, permit conditions may dictate that construction be monitored by a qualified and pre-approved wetland or wildlife specialist. 2.5 Signage/Limit of Boundaries Where appropriate, wetland delineation flagging or signage shall be installed that makes clear where critical boundaries (i.e., the limits of jurisdictional wetland resource areas, rare species habitat, and/or historical/cultural resources) and setbacks occur. Appropriate signage shall also be installed to indicate regulatory authorization by agencies and to prohibit certain uses on ROWs, such as ORV traffic. Where appropriate, signage shall be installed along sediment and erosion control barriers at appropriate intervals, heights, and sizes to ensure that the presence and location of said barriers is clear to construction personnel d uring deep snow or other low visibility conditions. Inspection and maintenance of this signage shall be conducted on a regular basis to ensure effectiveness. Section 2 Project Planning Eversource Best Management Practices Manual 2-4 Examples of signage at wetlands SECTION 3 Eversource Best Management Practices Manual 3-1 Section 3 Construction Considerations This section addresses BMPs specific to construction of new access roads, repair of existing access roads, the installation of work pads, structure-related work, and soil stockpile management. Information regarding recommended erosion and sedimentation controls or stormwater controls is also discussed. Please refer to Appendix A for typical details and representative photographs of BMPs used for erosion and sedimentation control and water diversion during construction. During all project activities (e.g., maintenance, new construction), federal, state, and local regulatory authorities require steps be taken to avoid, minimize, and/or mitigate disturbance to the environment. Sensitive environmental areas should be avoided whenever practicable. However, some projects may require entrance into these areas in order to perform work. This section discusses measures that should be taken to minimize disturbance to if work must occur within sensitive environmental areas. BMPs were developed to aid in this process and should be carefully selected and implemented based on the proposed activities and the nature of sensitive area(s) encountered at each site. Proper selection of BMPs should take into consideration the project goals, permit requirements, and site-specific information. Once an assessment of the area is made and requirements of the project are established, all BMPs should be considered and implemented as appropriate. 3.1 Avoidance and Minimization Avoidance and minimization should always be considered before beginning any construction or maintenance project. Eversource and their contractors should utilize appropriate measures to avoid construction impacts to sensitive environmental areas including, but not limited to: wetlands, waterways, rare species habitats, known below and above ground historical/archeological resources, and other environmentally sensitive areas. Use existing ROW access whenever practicable. Keep to approved routes and roads and do not widen or deviate from them. Consult with the Eversource Environmental Licensing and Permitting Group, when avoidance is not practicable, to determine measures to minimize the extent of construction impacts. Alternate access routes and/or staging areas that will minimize construction impacts to the natural environment may be considered. 3.2 Rare Species Habitat Eversource Environmental Licensing and Permitting coordinates with state and local agencies when work is within areas designated as rare and/or sensitive species habitat. In order to protect these resources in Connecticut, the following must be reviewed: • Natural Diversity Database (NDDB) area mapping. • Critical Habitat mapping. • Eversource’s New England Cottontail (NEC) BMP map. • Prior NDDB Determinations. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-2 The NDDB mapping is updated approximately every six months and is posted on the State’s GIS data download webpage. The Critical Habitat mapp ing is less frequently updated and also on the State’s GIS data download page. Eversource’s NEC BMP map and mapping which depicts prior NDDB Determinations shall be provided through Eversource Environmental Licensing and Permitting. In Massachusetts, Eversource has an annual Operations and Management Plan (OMP) which is updated and renewed at the start of each calendar year with the Natural Heritage Endangered Species Program (NHESP) which designates Priority Habitat (PH) in the State. All work in PH requires review of and compliance with the OMP which may include consultation with NHESP. The OMP establishes guidelines for work within known rare species habitat based on the type of species presence. These guidelines may include time of year (TOY) restrictions or similar measures to avoid impacts to rare species. Regardless of the State in which construction is taking place, the following shall be employed in all mapped, State-listed species and designated Critical Habitat areas: • Make every effort to avoid impacts to known populations of State-listed plants and other stationary resources. • Limit permanent impact through the use of temporary construction matting as opposed to gravel for access road and work pad construction. • If State-listed resources cannot be avoided, mitigation planning shall be discussed with Environmental Licensing and Permitting. • Consider time-of-year (TOY) restrictions to avoid impact to sensitive resources during critical life stages including but not limited to nesting season for ground and shrub nesting birds, pup rearing season for bats (if tree removal is necessary), flowering and seeding times for State-listed plants. Certain species, including the timber rattlesnake (Crotalus horridus), are one of the few venomous species in New England which can be a threat to worker safety. Protection measures provided by the respective State agency shall be followed and may require snake sweeps by a qualified herpetologist, contractor education, and field demarcation of hibernacula/known rattlesnake dens. 3.3 Hiking Trails The following practices shall be implemented in the event project areas intersect or overlap with recreational hiking trails. • Avoid using hiking trails as access roads or access routes for vehicles and equipment. • If a hiking trail must be used for vehicle or equipment access coordination with Eversource Vegetation Management Compliance or Oversight staff and/or Eversource Environmental Licensing and Permitting staff is required prior to use. • Utilize existing access roads to cross hiking trails to the maximum extent practicable. • If no existing access roads exist and a hiking trail must be crossed, minimize trail crossings by designating one location for use by equipment. • Signs, barriers, spotters or other means to alert the public to the work shall be Section 3 Construction Considerations Eversource Best Management Practices Manual 3-3 implemented. • Stockpiling logs and other cut material within 25 feet of hiking trails is not allowed unless approved by Eversource Vegetation Management Compliance or Oversight staff. • Spreading wood chips on hiking trails is not allowed unless approved by Eversource Vegetation Management Compliance or Oversight staff. • At the end of each workday all cut material must be removed from hiking trails. • As soon as possible after work is complete disturbed portions of hiking trails shall be returned as close to pre-construction condition as possible. This may include hand raking, hand cutting of stumps and/or hand removal of cut vegetation. • If any trees that are marked for trail navigation must be cut, the property manager or trail maintainer must be notified. • Posts or other markers that are used for trail navigation shall be protected at all times. Replacement in kind shall be completed by the contractor if disturbed or damaged during completion of the work. 3.4 Work on State-owned land in Connecticut For all work on State of Connecticut-owned land as depicted on the “DEEP Property” data layer available through the State’s GIS data download page, matting shall be employed to the greatest extent possible. Gravel access roads and work pads shall only be installed when terrain prohibits the installation of matting. All work must be coordinated through Eversource Environmental Licensing and Permitting for acquisition of necessary authorization prior to the start of construction on State-owned properties. 3.5 Historic/Cultural Resources Historic and cultural resources are diverse and include, but are not limited to, archaeological sites, historic structures, historic districts, stone walls, and ceremonial stone landscapes. Construction activities near or within significant resources are subject to restrictions outlined in any site or project-specific avoidance/protection plans. The locations of archaeological sites and other sensitive resource s such as ceremonial stone landscapes and burials are considered confidential and may only be disclosed on a need - to-know basis. 3.5.1 Stone Walls Stone walls can be considered significant resources for a number of reasons including unique construction methods, their function as a property boundary, their association with other historic resources such as archaeological sites or farmsteads, and/or their importance to the underlying landowner(s). Non-impact methods of managing work and access near stone walls should always be prioritized and removal, dismantlem ent, or other alterations to stone walls should be avoided, when possible. Non -impact methods of managing work near stone walls include: • Avoiding the stone wall altogether - This may involve re-routing an access road or selecting a new access point. Care should be taken not to incur additional impacts to other sensitive environmental areas (e.g., wetlands or rare species habitat). • Traversing the wall through an existing breach - In this scenario, the breach is Section 3 Construction Considerations Eversource Best Management Practices Manual 3-4 used as-is and the breach is not widened or expanded in any way. • Traversing the wall using timber matting to temporarily bridge over the wall (e.g., “air bridge”) - Although the construction of individual air bridges will vary depending on the surrounding topography, the height of the wall, and the individual operator, the timber mats should not touch the stone wall on any side, and a sufficient air gap between the top of the stone wall and the timber matting directly above should be left to ensure the stone wall is not damaged during the passage of heavy machinery. Before and after photographs of the portion of the stone wall to be crossed should be taken and provided to Eversource Environmental Licensing and Permitting. • Elevating work pads near stone walls using timber matting - If work pads cannot be reduced in size to avoid stone walls, timber matting may be used to elevate the work pad, or portions thereof, above the stone wall to avoid impacts. None of the timber mats should be in contact with the stone wall and before and after photographs of the stone wall should be taken. If implementation of the four non-impact measures noted above is not feasible and either temporary or permanent alterations to a stone wall are necessary, Eversource Environmental Licensing and Permitting must be contacted prior to any alterations occurring to secure the appropriate permissions. These permissions may take several weeks to secure and may require input from the cultural resources consultant or Eversource Real Estate and/or Legal Departments. Prior to alteration, proper documentation of the wall should be obtained and provided to Eversource Environmental Licensing and Permitting. At a minimum, this effort should include recording the following: • Wall dimensions (total length, width, average height) • Any existing breaches • Wall location and general orientation on project maps Photographs (including a scale, if possible) should also be taken of the entire wall clearly showing all sides, with increased attention on any areas of the wall that will be modified (e.g., expanded breaches) or will need to be rebuilt. The removal of dense vegetation along the stone wall prior to photography is highly recommended. Once permissions to alter a stone wall and appropriate documentation ha ve been secured, the following BMPs should be followed during alteration and rebuilding: • While it is preferred that alterations be conducted by hand following tradi tional dry stone construction methods, construction machinery may be used when appropriate to the level of effort required and taking care not to unreasonably scratch or mar the stones or to begin excavating into soils underneath the wall. • Any removed stones should be stockpiled nearby, outside any identified sensitive environmental areas such as wetlands or rare species habitat. • When rebuilding, the wall should be reconstructed in the same location as the original and should match the original wall as closely as possible; if present, it is preferred that weathered/moss-covered surfaces are exposed. • When alterations/rebuilding is complete, additional photographs from all sides should be taken and provided to Eversource Environmental Licensing and Section 3 Construction Considerations Eversource Best Management Practices Manual 3-5 Permitting. 3.5.2 Unanticipated Discoveries During construction activities, most notably ground disturbing activities such as excavation, trenching, or grading, it is possible to discover previously unknown archaeological resources. Any specific procedures outlined in project-specific documents such as Post-Review Discoveries or Unanticipated Discoveries Plans should be followed. If such documents do not exist and a contractor encounters an unanticipated discovery, the contractor shall immediately notify the Eversource Construction Representative/Supervisor, secure the site, and not restart work in the area of the discovery until after the Eversource Senior Cultural Resources Program Administrator has granted clearance. 3.6 Human Remains In the event human remains are encountered, the contractor must immediately stop work and notify the Eversource Construction Representative/Supervisor, secure the site, and ensure that the remains are treated with the utmost dignity and respect. The remains should be covered and left undisturbed along with any associated artifacts. No photography of the remains is allowed and work will not resume in the area of the discovery until after the Eversource Senior Cultural Resources Program Administrator has granted clearance. In addition to these preliminary guidelines, all relevant state laws and guidelines, including, but not limited to, the Massachusetts Unmarked Burial Law (M.G.L. Chapter 38, Section 6) and the Connecticut Human Burials Law (Conn. Gen. State. Sec 10-388) must be adhered to. 3.7 Vernal Pools Construction within and across wetlands and in proximity to vernal pools should be limited to the extent practicable to avoid working in the periods between April 1 st and June 1st. This will allow for obligate vernal pool species to emigrate to the breeding areas, deposit egg masses, and allow for hatching and development of juveniles. Silt fence should be installed at the limits of the construction to prevent individual reptiles and amphibians from entering the workspace, but in a manner that does not impede movement to and from pools from adjacent forested uplands. Consider installing syncopated silt fencing. Protection Measures When performing construction activities in proximity to vernal pools, a number of protection measures should be implemented. Vegetation Removal • Maintain existing scrub-shrub vegetation (consistent with ROW vegetation management requirements) within 25 feet of vernal pools, except in areas where access roads and work pads must be installed. • Minimize removal of low growing (scrub-shrub) vegetation surrounding vernal pools by utilizing construction matting where access is needed. If vegetation must be cut adjacent to vernal pools, the cut vegetation (slash) should be left in place to serve as recruitment for leaf litter and coarse woody debris. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-6 Erosion and Sedimentation Control • Where the potential for sediment intrusion and runoff into a vernal pool exists, sedimentation and erosion controls shall be installed. • Promptly remove erosion and sedimentation control devices upon final revegetation and stabilization of the ROW. Access Roads • Use construction mats, corduroy roads, or clean materials (i.e., clean riprap, gravel, stone or equivalent and rock fords) in locations where existing on -ROW access roads must be improved and are adjacent to vernal pools. • Man-made depressions along existing on-ROW access roads provide low-quality vernal pool breeding habitat (due to an insufficient hydroperiod). Access roads must be graded and/or improved to accommodate project construction vehicles which may eliminate these depressions and the associated potential for amphibian breeding habitat. Perform improvements to on-ROW access roads outside of the breeding and migration seasons of vernal pool species to avoid direct impacts to amphibians that may breed in the man-made depressions along existing on-ROW access roads. Scheduling and Site-Specific Considerations • To the extent practicable (and in consideration of circuit outages and other construction timing constraints), schedule access road and work pad installation in and around vernal pool habitats to minimize interference with amphibian breeding and migration seasons. • For project activities that must occur adjacent to vernal pools during amphibian migration periods, implement measures on a site-specific basis to facilitate unencumbered amphibian access to and from vernal pools. Consider the site- specific conditions including the type of construction activity that will occur in proximity to a vernal pool, the amphibian species known to occur in the vernal pool, and seasonal conditions. Identify appropriate mitigation measures. Options to be evaluated to allow amphibian access to vernal pools may include, but not be limited to: syncopated silt fencing in the immediate vicinity of vernal pools; elevated construction matting; and aligning erosion and sedimentation controls to avoid bifurcating vernal pool habitat. 3.7.1 Certified Vernal Pools (MA) Encroachment upon Certified Vernal Pools (CVP) in Massachusetts should be avoided to the maximum extent practicable. CVPs are considered Outstanding Resource Waters (ORWs) in Massachusetts and are regulated under the 401 Water Quality Certification program. Consult with Eversource Environmental Licensing and Permitting. 3.8 Access Roads Existing construction access roads are unpaved roadways that work crews use to access a site within a ROW. These access roads were generally either permitted previously or Section 3 Construction Considerations Eversource Best Management Practices Manual 3-7 constructed prior to the promulgation of regulations and are previously authorized under past general permits. 3.8.1 New Access Roads New access roads are generally associated with new or large -scale projects that have separate permitting requirements. Construction of new access roads will be based on plans that are reviewed and approved by applicable federal, state, and local agencies. If a new access road is needed and not associated with a large project, notify Eversource Environmental Licensing and Permitting to make a decision on best access routes and identification of the necessary permits and approvals required to construct the new road. Permit requirements must be followed. 3.8.2 Existing Access Roads The travel surface width of access roads in upland areas is not to exceed 16 feet. This does not include side slopes. Maintenance of existing access roads includes mowing of vegetation, grading, placement/replacement of stone, and the installation/maintenance of erosion control features (e.g., water bars, swales, sedimentation basins). When access roads are in wetlands, measures should be taken to avoid disturbance to wetlands, waterways, and other sensitive environmental areas. If avoidance is not practicable, then measures should be taken to minimize the extent of disturbance. Alternate access routes should always be considered. Below is a list of methods that should be considered where disturbance is necessary: • Minimize the width of typical access roads through wetlands. If an existing access road is evident in the wetland based on the presence of previously imported road- building materials (e.g., crushed stone), the existing width of the access road must be maintained. If unable to ascertain the original width of the access, then do not make the road wider than 16 feet (including side slopes). • To the extent practicable, use low-impact vehicles and/or vehicles with low ground pressure when driving through wetlands. • Coordinate the timing of work to minimize impacts during the regulatory low-flow period under normal conditions, when water/ground is frozen, after the spring songbird nesting season, and outside of the anticipated amphibian migration window (mid- February to mid-June). The ACOE defines the low-flow periods for streams as follows: o Connecticut streams—July 1 through September 30 o Massachusetts non-tidal streams—July 1 through February 28 o Massachusetts tidal streams—November 16 to February 15 • Use construction mats in wetlands to minimize soil disturbance and rutting when work needs to occur during non-frozen ground conditions. • If practicable, conduct work manually if warranted (decision to be made by the Eversource Project Team). Existing access roads are characterized by a clear dominance of imported fill material to a depth of at least three inches. When determining the presence and extent of an existing access road, soil probes shall be advanced as necessary to establish the boundary between fill and native soil. In some cases, hydrophytic vegetation may have become established or ponding may occur within the limits of imported fill. In these cases, the clear and Section 3 Construction Considerations Eversource Best Management Practices Manual 3-8 consistent presence of fill along a distinguished route is considered a previously authorized fill. Where the existing access road is not evident, Eversource Environmental Licensing and Permitting must be consulted to make a determination whether stone can be placed in the wetland. If stone is not evident, through soil cores, hand digging or other methods, construction mats must be used. If permanent access is warranted through the wetland, the new access road will need to have a permitting review and will likely require permits. The access road in the wetland should not exceed 16 feet in width (unless there is evidence that the road was originally wider than 16 feet). Over time, existing access roads require maintenance and repair. Travel by construction equipment and general traffic to reach a particular porti on of the ROW must be via the designated access road and route. Changes in the location of the access road or the use of alternate roads must be reviewed and approved by the Eversource Project Team prior to their construction or use. Access road routes were selected to prevent degradation of the utility corridor, and must be constructed, used, and maintained in accordance with this BMP Manual, as well as federal, state, and local requirements, and other project plans. In some situations, it may be necessary to construct redundant access roads, this practice should be avoided to the extent practicable. Some appropriate reasons for suggesting alternate routes are: • Poor site conditions along preferred route because of weather or season. • Property rights constraints, or property owner’s preference. • Equipment requirements. • Unanticipated off-site access limitations along existing roads. Unanticipated access opportunities (e.g., ice, snow, other developments) which may avoid environmental disturbance and/or reduce cost. General Design: New and Existing Access Roads Construction access roads that require new grading and/or filling or are to be heavily used require the creation of a stable, load-bearing surface resistant to erosion. If the existing soil and subsoil are not well drained, it may be necessary to import an aggregate road base (i.e., gravel borrow) such as that meeting the requirements of aggregate found in the: • Commonwealth of Massachusetts Department of Public Works Standard Specifications for Highways and Bridges, Section 400 • Connecticut Standard Specifications for Roads, Bridges and Incidental Construction, Section M1.02 When the construction access road follows the same route as the permanent design road, establishing the grades and subgrade for the permanent roadway early in the construction sequence is recommended. The travel surface of construction access roads shall typically not exceed 16 feet in width except for passing points, where necessary. Subgrading shall not extend beyond the space required for the finished road and normal side slopes. Where practicable, construction access roads should conform to the contours of the land, Section 3 Construction Considerations Eversource Best Management Practices Manual 3-9 avoiding grades steeper than 10 percent and creating side slopes no steeper than a ratio of 2:1. If the side slopes are steeper than 2:1, then use of engineered slope stabilization methods may be necessary. Consider the volume and type of construction traffic as well as the extent that natural ground must be altered to accommodate the traffic. If no grading is required and traffic is sporadic (i.e., access roads used to maintain utility lines) the measures used may be limited to water bars, or some top dressing with gravel or stone in areas where the vegetation over soft soil is destroyed by traffic. During wet weather, these roadways can generate significant quantities of sediment if not constructed with adequate stormwater management and erosion control measures. During active construction or maintenance activities, inspection of the construction access road and associated erosion and sedimentation measures should be conducted by the person(s) designated at the pre-construction meeting, should occur regularly while the activity is occurring, and repairs to controls should be made in a timely matter. Repairs may include re-grading and/or top dressing the traveled surface with additional aggregate to eliminate ruts, as well as those repairs required by each erosion and sedimentation measure used. When the roadway is no longer needed on a regular basis, the access road should be reviewed to ensure that the road is left in a condition that prevents future erosion and sedimentation (e.g., installation of water bars, gravel). In some cases, permit conditions may require that the access road be removed and that the disturbed area be restored (e.g., seeded and mulched) in accordance with applicable permits as required to match the pre-construction conditions. Erosion and Sedimentation Controls Construction personnel are reminded to control erosion and flow conditions during access road construction or maintenance activities by utilizing the following erosion and sedimentation measures which are described and illustrated further in Appendix A: • Outlet protection, a level spreader, a trench breaker, a sediment trap or basin, or a stone check dam may be used to de-energize concentrated flows from diversions and in temporary channels. • Geotextile silt fencing, compost filter berms, straw wattles and straw bale barriers may be utilized to provide protection at the toe of fill slopes and discharges from water bars. • Side slopes can be protected by installing erosion control blankets and seeding the area with a fast-growing native or annual grass mix. • Dust control should be employed when construction access road conditions create airborne dust. • Geotextile fabric shall be used beneath all new fill and construction entrances, where needed. **The use of hay and/or hay products is strictly prohibited.** **The use of nylon and/or plastic netting is strictly prohibited.** 3.8.3 Best Management Practices – New Access Roads The following are BMPs that are applicable to new access roads in uplands and are described at the following tabs: Construction Entrance Track Pad (see Figure A01 in Appendix A) Section 3 Construction Considerations Eversource Best Management Practices Manual 3-10 Stormwater Management BMPs (includes Water Bars [Figure A02], Drainage Swales [Figure A03], and Sedimentation Basins [Figures A38-A41] in Appendix A) Construction Entrance Track Pad Applications: Erosion and sedimentation control, roadway protection Limitations: • Maintenance is required if the pad becomes clogged with soil. • Muddy conditions may warrant the use of a tire wash station. Overview: Where access roads or construction areas connect to paved roads, a stone track pad must be installed at the construction entrance to prevent construction machinery from tracking soil onto paved roadways. Materials appropriate to construction site soil conditions should be employed and/or replenished, as necessary. Installation: • Use 3- to 6-inch washed stone to install stone tracking pad s at a minimum length of 50 feet and a minimum depth of 12 inches. • On sites with clayey soils, underlay stone tracking pads with a geotextile liner to prevent the stone from sinking into the soil. Maintenance: • Periodically inspect the stone in the entrance track pad. If the pad becomes clogged with soil, remove and refresh and/or clean stone. Additional Comments: If muddy conditions warrant the use of a tire wash station, procedures should be established to ensure soils are not tracked off site. Where appropriate and when safety and environmental conditions are considered, vehicle tires or tracks may be spun quickly (“burn out”) on the track pad to further facilitate the removal of soil. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-11 Water Bar Applications: Erosion and sedimentation control Limitations: • Should never be used to direct a watercourse into another waterbody or to divert unfiltered runoff to a wetland. • Can impede vehicular movement. • Damage from vehicle traffic and stormwater flow may require water bars to be reinstalled/reworked at the beginning and end of each construction season. Overview: Water bars are linear features built diagonally across access roads or ROWs to redirect stormwater runoff away from the road surface at non-erosive intervals. In general, they consist of a trench dug at least 6 inches below grade followed by an earthen mound at least 6 inches above grade. Use water bars to prevent erosion on sloping roadways less than 100 feet wide. Water bars must be designed to be stable througho ut their useful life and meet the criteria in the table below. The maximum capacity should be the peak runoff from a 10-year storm. Installation: • Set water bar direction to utilize stable outlets and do not allow upslope water bar runoff to converge with down slope water bars. Water bars should be directed into well vegetated upland areas, sediment basins, or other erosion and sedimentation controls (e.g., straw bales, silt fence) as needed. • Construct the bar immediately after vegetation has been clear ed on constant or slightly increasing grades, not exceeding 2%. Avoid reverse grades. • Mark the location and width of the ridge and disk the entire length. • Fill ridge to above the design height and compact with wheeled equipment to the design cross section. • Construct sediment traps or outlet stabilization measures, as needed. • After the area has been permanently stabilized, remove the ridge and channel to blend with the natural ground level. • Seed and mulch diversions that are intended for use for more than 30 days. Minimum Cross Section Top Width (ft) Height (ft) Side Slopes 0 1.5 4:1 4 1.5 2:1 Section 3 Construction Considerations Eversource Best Management Practices Manual 3-12 Maximum Recommended Spacing1 Land Slope (%) Diversion Spacing (ft) < 5 125 5 to 10 100 10 to 20 75 20 to 30 50 > 35 25 1 Recommendations for ROW widths less than 100 feet as per the Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas (MassDEP, March 1997). Maintenance: • Inspect each week and after rain events of 0.25 inches (MA) or 0.50 inches (CT) or greater, or more frequently per permit conditions or Eversource Environmental Licensing and Permitting. Repair damage caused by construction traffic or erosion. • Remove accumulated sediment and debris from the trench and stabilize outlets. • If necessary, repair ridge to a positive grade and cross section, and add gravel at crossing areas. • Use routine inspections to determine if the original spacing is adequate or if additional water bars need to be constructed. Drainage Swales Applications: Convey stormwater away from work area and/or improve water quality and reduce peak runoff. Limitations: • Vegetated swales need to have adequately established vegetation before flow is diverted to them. • Need to have adequate bottom stabilization to prevent scouring. Overview: Drainage swales usually consist of a ditch that is either vegetated or lined with riprap, erosion control blankets, or other materials. They are natural or constructed waterways/outlets that intercept, redirect, and convey storm water away from the work area to a stable location and are used in areas where concentrated runoff would otherwise cause erosion/flooding. Swales can be used to reduce erosion in uplands and/or prior to discharge of stormwater flows to natural receiving wa ters (e.g., wetlands or streams). They also help to reduce surface flow velocity and turbidity. Grass Lined Channels (Stabilized with vegetation) • Use where vegetative lining will provide sufficient stability, slopes are less than 5%, and space is available for a wide cross section. Installation: • Remove trees, brush, and stumps. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-13 • Excavate and shape channel to dimensions on plans. Overcut 0.2 ft for vegetative growth. • Install temporary liner or riprap at inflows and stabilize outlets. • Vegetate immediately after construction and divert water until grass establishes. Install matting if flow cannot be diverted. • Install sod rather than seeding where slopes approach 5%. • Spread topsoil to a minimum of 4 inches where soil conditions are unfavorable. Seeded channels should be mulched. Vegetated Swales (Stabilized with dense vegetation) • Use for water quality improvement and peak runoff reduction. Applicable for small drainage areas with relatively small amount of impervious cover. The grassed waterway is used to convey runoff at a non-erosive velocity. Dense vegetation can be established and a stable outlet constructed. Installation: • General design parameters are as follows: minimum capacity 10-year, 24-hour storm; design slopes to prevent erosion during the 2-year storm event; maximum side slopes 3:1; bottom width 2 to 8 feet. • Vegetate with a native erosion control seed mix for use at moist sites and divert flow until established. Riprap Lined Channels (Contains lining of riprap or stone) • Use on sites where channel flow velocities exceed those acceptable for grass lined swales. Applicable where vegetative establishment is not possible or there are steep grades, wetness, highly erodible soils, seepage or prolonged base flow. Installation: • Remove trees, brush, and vegetation from channel area. • Stabilize inlets and install outlet protection. • Construct channel and install filter and lining as shown on plan. • Use the maximum stone size for riprap plus thickness of filter. Maintenance: • Swales need to be routinely maintained to prevent brush/sediment buildup. Inspect swale regularly and after every rain event (0.25 inches (MA) or 0.50 inches (CT), or greater). Repair and/or re-seed rill or gully erosion. Remove accumulated sediments and brush before it reaches a depth of 6 inches. Additional Comments: • Depth and spacing of swales should be dependent on runoff conditions of the specific site. • If required, install check dams constructed of riprap or other materials to slow flows along certain reaches of a swale. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-14 • Remove temporary swales once construction is complete or areas are stabilized. If leaving swales in place will provide long -term benefits and be compatible with the ultimate use of the site, then they may remain in place. Sedimentation Basins Applications: Erosion and sedimentation control Limitations: • Traps and basins need to be adequately sized based on expected rain events and the contributing drainage area. Overview: Sediment traps and basins are used to filter and settle out suspended solids in stormwater runoff before water is released into a wetland or other unprotected and/or sensitive environmental area. A sediment trap is a temporary measure installed during construction to detain runoff, while a basin is a more permanent measure. Basins are also used where other erosion control measures are not adequate to prevent off-site sedimentation. Sediment traps and basins should have three components: a forebay, a check dam, and a basin. Debris and some sediments begin to settle out of the water in the forebay. The stone or straw bale check dam filters more suspended solids as water flows through. The actual basin is a low-velocity pool where suspended solids settle out of the water column before the water is released at the outlet. Based on the size of the project area, a qualified engineer may be required to calculate the appropriate size of the basin. State-specific guidance for basin sizing can be found in the following locations: • Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas (Page 140); http://www.mass.gov/eea/docs/dep/water/esfull.pdf • 2002 Connecticut Guidelines for Soil Erosi on and Sediment Control (Section 5-11- 1); http://www.ct.gov/dep/cwp/view.asp?A=2720&Q=325660 . Installation: Drainage area of 5 acres or less: • Install to direct stormwater runoff to the sedimentation trap or basin. Form basin by excavating a depression similar to a small pond or by placing an earthen embankment across an existing drainage swale or naturally low area. • The ratio between the basin length and width should be greater than 3:1 (L:W). A ratio of 9:1 is recommended. • Clear, grub, and strip all vegetation and root material from area of embankment and place embankment fill in lifts (<9”/lift, max). Compact fill and construct side slopes 2:1 or flatter. Excavate rectangular outlet section from compacted embankment. • Filter fabric may be installed on bottom and sides of basin and covered by riprap. • Extend outlet apron/spillway below toe of dam on level grade until stable conditions are reached (5 feet minimum). Cover inside face of s tone outlet section with a 1- Section 3 Construction Considerations Eversource Best Management Practices Manual 3-15 foot layer of ½- to ¼-inch washed stone. • Use permanent or temporary seeding to vegetate embankments, spillways, and disturbed areas downgradient of the basin. Drainage area of 10 acres or less: • Locate the basin in an easily accessible upland area, not a wetland area. • Install the basin so that it intercepts the largest possible amount of runoff from the disturbed area. • Divert sediment-laden water to the upper end of the sediment pool to improve trapping effectiveness. • Basin should have a minimum volume based on ½-inch of storage for each acre of drainage area. • Size basin to provide a minimum detention of 12 to 24 hours at the maximum runoff quantity expected for the duration of the basin’s use. Maintenance: • Monitor the amount of sedimentation in the trap/basin. Install a stake with a marking at half the design depth. Remove sediment when it reaches this mark. • Inspect after every rain event. • Clean or replace the spillway gravel and re-seed/plant vegetation, as needed. • Monitor embankment, spillway, and outlet for erosion. Repair erosion problems immediately. Additional Comments: Construction of sediment traps and/or basins should occur before primary construction on a project begins. They are often a critical stormwater management component for larger construction sites and/or those with poorly drained upland soils. If compatible with the post-construction site use, it may be appropriate to leave sediment basins in place indefinitely. 3.8.4 Construction in Wetlands Access roads that are constructed in or across wetlands require the following considerations in addition to the considerations for access roads in uplands: • Construction of new access roads in wetlands, whether temporary or permanent, that do not utilize construction mats (e.g., earthen and/or rock fill roads, corduroy roads) requires considerable project specific permitting and design. These types of projects should comply with project specific permits and plans, while only using this BMP manual as a general reference source. Permits often also require wetlands replication when permanent new access roads are constructed in wetlands. • Avoid putting the construction access road in a wetland whenever practicable. Explore all feasible and prudent alternatives before determining that a wetland crossing is necessary. When avoidance is not practicable, consider crossings that will result in the least amount of disturbance. This may involve locating the construction access road so that it crosses the wetland at its narrowest width or uses areas previously disturbed for access or other purposes. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-16 • Minimize the width of the temporary construction access road through the wetlands (generally no wider than 16 feet when using construction mats). It is preferable to have a passing point created before and after the wetland crossing, but internal passing points may be needed if the crossing is long or critical sight line restrictions exist. • Construct access roads so that wildlife is able to pass under or go through the road. In areas where the road is only one construction mat thick, allow for passageways or “gaps” between construction mats. In locations where the access road is greater than one mat thick, install elevated construction mat road crossings or ”bridges .” Gaps and/or bridges are to be placed along the access road at intervals no less than 50 feet. • Consider the soil conditions. Expect deep organic wetland soils to require geotextiles, construction mats, or other materials during use to keep imported road materials separated from wetland soils. In shallow organic or saturated soils, thick plywood sheets or AlturnaMATS® may be sufficient to support a stable travel surface for small, lightweight vehicles. In addition, in areas which are inundated or have deep organic wetland soils, it may be necessary to use more than one layer of construction mats. • Prevent obstructions to surface and subsurface flow across and through the construction access road. Provide adequate drainage. This may require the use of crushed stone, a layer of log corduroy, construction mat bridges, or multiple cross culverts, particularly if the wetland does not contain a well -defined watercourse channel and/or the wetland crossing is long. If the wetland soils are susceptible to seasonal high groundwater tables or flooding, then give additional consideration for maintaining flows across and/or over the construction access road without causing erosion or siltation during such times. • Plan in advance how the construction access road will be removed and the wetland restored. A road stabilization geotextile can facilitate the segregation of imported soils and crushed stone and/or log corduroy from the native wetland soils and make wetland restoration easier. However, after the end of an extensive project and a highly traveled crossing, stone removal from the wetland surface will still usually have to occur, even when placed in conjunction with geotextile. In some cases, access roads may not need to be constructed in a wetland to gain acce ss into or through a wetland if the work can be designed such that disturbances to the wetland are avoided or negligible. Options to be considered are presented below. Equipment Selection and Usage: • Low ground pressure equipment - Using equipment that reduces the pressure it exerts on the ground can minimize disturbance to sensitive areas. Employing the use of equipment with wide tires, rubberized tracks, and low ground pressure (<3 psi when loaded) can help minimize soil compaction. • Wide tires - Increasing the width of tires will increase traveling surface area and therefore reduce the amount of ground compaction that the equipment will cause. Ultimately, this will reduce rutting, and allow for easier maneuvering of the vehicle. However, wide tires may be costly and will require a wider travel area. • Rubberized tracks - Equipment with rubberized tracks spreads the weight of the vehicle over a much larger surface, reducing ground pressure and enabling the vehicle to move more freely through wet substrates. Each track can be between Section 3 Construction Considerations Eversource Best Management Practices Manual 3-17 1.5 and 3 feet wide, length depending on the width of the vehicle. This can greatly reduce rutting and allow the vehicle to move with less difficulty through wet substrates. • Lightweight equipment - Disturbance in a wetland area can be lessened by reducing the size of equipment (e.g., ORVs, Gator™) used in sensitive environmental areas. This reduces the amount of pressure to the travel surface as well as the necessary width of access ways. Timing of Work: • Work during frozen conditions. Activities conducted once wetland areas are frozen can minimize rutting and other disturbance to the surrounding environment. Work during this time also generally reduces disturbance of aquatic and terrestrial wildlife movement by avoiding sensitive breeding and nesting seasons. • Work during the “low flow” period. Conducting work during the low flow period can reduce disturbance to surface water and generally avoids spawning and breeding seasons of aquatic organisms. The ACOE defines the low-flow periods for streams as follows: o Connecticut streams—July 1 through September 30 o Massachusetts non-tidal streams— July 1 through September 30 o Massachusetts tidal streams—November 16 through February 15 Alternate Access: • Manual access – Consider accessing work areas on foot through terrestrial areas and/or by boat through open water or ponded areas. Smaller projects (e.g., repairs to individual structures or parts of structures) do not categorically require the use of heavy machinery and should be accessed manually to the extent practicable. • Limit trips – Multiple trips through a wetland have shown to increase the potential for damage and requirement for matting. Try to limit trip to one in and one out. Use of overhead/aerial access (e.g., helicopters): • Using overhead or aerial equipment can be expensive a nd is not always feasible, but it may be appropriate in some situations to get vehicles and other equipment to a site that may be otherwise very difficult to access. The use of overhead and/or aerial equipment may be beneficial for work in areas where larg e water bodies, deep crevices, or mountainous areas hinder ground access. Erosion and Sedimentation Controls: Construction personnel are reminded to control erosion and flow conditions during new access road construction by utilizing the following erosion and sedimentation measures which are described and illustrated further in Appendix A: • Straw wattles [Figure A26 in Appendix A], geotextile silt fencing [Figure A22 in Appendix A], and straw bale barriers [Figure A21 in Appendix A] may be installed at the edges of earthen roads or construction mat roads to prevent erosion of soil into wetlands from the road fill or tracked soil on construction mats. • In areas where silt fencing is required for more than one activity season, syncopated silt fencing [Figure A23 in Appendix A] may be installed to permit animal crossings. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-18 • Side slopes of earthen roads can be protected by installing erosion control blankets [Figure A25 in Appendix A] and seeding [Figure A32 in Appendix A] the area with a fast-growing native or annual grass mix. • Dust control should be employed as necessary when construction access road conditions create airborne dust when necessary. Refer to Section 3.16 of this BMP Manual. Best Management Practices – Construction in Wetlands The following are BMPs that are applicable to new access roads in wetlands and are described at the following tab: Construction Mats (includes Elevated Construction Mats and AlturnaMATs®; see Figures A04 – A06 in Appendix A) Permeable Road (see Figure A08 in Appendix A) Dewatering (see Figures A39 – A41 in Appendix A) Construction Mats (i.e., timber or swamp mats) Applications: Wetland crossings, rut minimization • Used for access where the ground surface is unstable due to shallow, standing water, saturated soils, or other substrates not suitable for heavy vehicles. Limitations: • Only for temporary use. Generally, mats should be removed upon construction completion. • May float away in high water conditions. • Need to be installed with heavy machinery. • AlturnaMATs® limited to smaller vehicles and equipment. • Equipment operators should remain cautious so as not to drive off or slip off the side of the mats. • In winter, mats must be plowed and sanded or heated to prevent equipment fro m sliding off mats. Use of a deicing agent requires approval by Eversource Environmental Licensing and Permitting. Snow removal must be conducted in accordance with the Eversource Snow Removal BMP (refer to Section 3.15). Installation: • Place mats along the travel area without any gaps and so that each board is positioned perpendicular to the direction of traffic. Position mats so that they are offset far enough from the resource area so that ruts are not created when equipment enters and exits a sensitive area. • Remove mats by “backing” out of the site and removing mats one at a time. Regrade soils to pre-existing contours while taking care not to compact soils. • Clean mats after use to remove any invasive plant species seed stock. Cleaning methods may include, but are not limited to, shaking or dropping mats in a controlled manner with a piece of machinery to knock off attached soil and debris, Section 3 Construction Considerations Eversource Best Management Practices Manual 3-19 spraying with water or air, sweeping, or exposing the mats to high temperatures. • Clean mats that were used in wetlands dominated by invasive species using brooms, shovels, and compressed air, if needed. Additional Comments: Construction mats installed in wetlands categorized as ORW s in Massachusetts must be underlain by non-woven geotextile, which can be placed directly on the ground surface beneath the first layer of matting or atop the first layer of matting if additional layers of mats are to be installed. Lightweight, easy to maneuver alternatives to traditional mats are available. For example, AlturnaMATS® are half-inch thick polyethylene slip-resistant ground protection mats available in dimensions up to 4 feet by 8 feet and weigh between 21.5 and 86 pounds. Mat anchoring may be required for matting installed in areas prone to flooding, such as stream crossings, shorelines of lakes and ponds, floodplains where known base flood elevations are 2 feet or greater above the ground surface, and tidal areas, and when mats will be in place in these areas for more than two weeks during hurricane season. The need for, and type of, anchoring should be coordinated with Eversource Environmental Licensing and Permitting. Examples of mat anchoring include: • Linear ropes anchored using helical screws, manta ray anchors, or posts. • Cable or report in chain pockets and run linearly. Construction mat anchoring methods are illustrated in Figure A07 in Appendix A of this BMP Manual. Additional methods may be necessary depending on site and/or weather conditions. Permeable Road (i.e., rock sandwich, French Mattress, or road with continuous cross- drainage) Applications: Temporary wetland crossings, rut minimization Limitations: • Must be removed entirely at the end of construction unless project -specific permits have been obtained to allow for permanent wetland fill. • Not appropriate for areas where concentrated, high volume and/or velocity water flow will intersect the road (i.e., stream crossings). • Need to be installed with heavy machinery. • Equipment operators should remain cautious so as not to drive or slip off the side of the road. Overview: Permeable roads are used for access in situations not suitable for heavy vehicle use often due to unstable ground surfaces with shallow standing water, saturated soils, or other unstable substrate. Installation of a permeable road can also help reduce the potential for frost action and pothole creation by preventing groundwater from wicking up into the road fill material. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-20 Installation: • Cover existing soil with a geotextile fabric prior to road construction. Excavation of existing soil is generally not recommended in order to minimize impacts to the resource area. Construct road on top of the soil surface, as shown on the typical on the next page. Drainage layer materials include 3- to 6-inch rock (12-inch minimum depth) or log corduroy (2-inch minimum diameter). • Install the road so that it is offset far enough from the resource area so that ruts are not created when equipment enters and exits a sensitive area. • Remove road by “backing” out of the site and removing road one section at a time. Regrade soils to pre-existing contours while taking care not to compact soils. Maintenance: • Regularly inspect and clean edges of cross-drainage layer along the sides of the road to prevent clogging by debris, leaf litter, sediment, etc. 3.8.5 Watercourse Crossings There are a number of BMPs that can be used to minimize disturbance to streams. For each application, consider the site and project needs to select a method that is cost effective and will incur the fewest secondary disturbances. Additional erosion and sedimentation controls (e.g., straw bales) may be required in conjunction with the stream crossing BMPs to protect sensitive areas. The stream crossing methodology chosen will depend largely on the equipment required for a particular task, the existing environmental conditions, and the duration of the crossing. In constructing any stream crossing, care should be taken to limit disturbance to the extent practicable within 100 to 200 feet of the stream banks (the riparian area). The riparian area provides habitat to a number of speci es and provides protection and shading to the stream. Erosion and Sedimentation Controls Construction personnel are reminded to control erosion and flow conditions during new watercourse crossings by utilizing the following erosion and sedimentation measur es which are described and illustrated further in Appendix A: • Straw wattles [see Figure A26 in Appendix A], geotextile silt fencing [see Figure A22 in Appendix A] and/or straw bale barriers [see Figure A21 in Appendix A] may be installed at the edges of earthen roads or construction mat roads to prevent erosion of soil into watercourses from the road fill or tracked soil on construction mats. These controls however should generally not be placed within a watercourse. • Side slopes of earthen roads can be protected by installing erosion control blankets [see Figure A25 in Appendix A] and seeding [see Figure A32 in Appendix A] the area with a fast-growing native or annual grass mix. Best Management Practices – Watercourse Crossings The following are BMPs that are applicable to new access roads watercourse crossings and are described at the following tabs: Stream Crossings without Bridges (includes limiting turbidity and stone crossing ; see Figures A05, A06, and A12 in Appendix A) Section 3 Construction Considerations Eversource Best Management Practices Manual 3-21 Bridged Crossings (includes construction mat bridges and rail car frame bridges; see Appendix A) Dewatering (see Figures A39 – A41 in Appendix A) Stream Crossings Without Bridges: Limiting Turbidity Applications: Stream crossing, turbidity control Limitations: • Limited to areas where stream banks and bottoms will not be significantly damaged by the crossing. Overview/Use: • In some situations, such as routine or emergency maintenance with small ORVs, pickup trucks or tracked equipment, it may be acceptable for equipment to simply travel (perpendicularly) through a stream. • Crossings are generally considered acceptable in situations where there is an existing or historic access road, a stable rock or sand/gravel stream bottom, and/or the crossing is at a relatively narrow reach of the stream and any adjacent wetlands. • Cross streams slowly to minimize in-stream turbidity. Stream Crossings Without Bridges: Stone Crossings Applications: Stream crossing, turbidity control Limitations: • Only use in small (less than 2 feet wide or braided) intermittent streams which do not appear on USGS topographic maps and have a downstream section with a gradient greater than 20%. • Not suitable in areas where there could be a potential for fish passage. • Stone size should be sufficient to allow for macroinvertebrate passage. • Not preferred for new access road crossings; generally more suitable for existing access road crossings. • Project-specific permitting may be required to allow for installation of stone within a stream bed. Consult with Eversource Environmental Licensing and Permitting prior to using this crossing method. Overview/Use: • Use to cross small streams with stable stream bottoms. • Carefully place 6-inch to 8-inch clean angular stone within stream at crossing. Limit width of stone to that needed for widest vehicle/equipment to crossing the stream. • Drive over stone slowly. • Leave riprap in intermittent streams for future use. More damage will occur by removing stone. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-22 Bridged Crossings: Construction Mats as Temporary Bridge Applications: Watercourse crossings Limitations: • Installation requires machinery. • May become unstable under high flows. Overview/Use: • Untreated wooden construction mats may be used as a temporary bridge over a stream to allow construction vehicles access to the work site. Construction mat bridging is suitable for crossing intermittent and perennial streams. Before constructing a stream crossing, confirm that the construction mats are capable of supporting the equipment to be used. • Place small sections of matting on either side of the stream parallel to the flow of water at top of banks to act as supports. Then place mats perpendicular to the stream and resting on top of the initial construction mat supports. • Install non-woven geotextile between the first and second layers of matting; install erosion control barriers (e.g., straw bales, straw wattles, silt socks) along edges of timber matting to minimize potential for soil to discharge to the stream. • Use of non-woven geotextile fabric at ORW crossings (MA) is required. Bridged Crossings: Rail Car Frame as Temporary Bridge Applications: Watercourse crossings Limitations: • Requires heavy equipment for transport and installation. • Expensive. • Banks must be stable to support heavy loads. Overview/Use: • Used rail car frames can be used for crossing larger and deeply incised streams where construction mats are unsuitable. • Place the rail car frame perpendicular to the stream flow and between opposing banks. Use timber frame footings, if necessary. Next, place construction matting • Install non-woven geotextile between the first and second layers of matting; install erosion control barriers (e.g., straw bales, straw wattles, silt socks) along edges of timber matting to minimize potential for soil to discharge to the stream. Use of non-woven geotextile fabric at ORW crossings (MA) is required. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-23 Culvert Installation/Repair/Replacement *Contact Eversource Environmental Licensing and Permitting prior to performing any culvert installations, repairs and/or replacements* Applications: Stream and wetland crossings Limitations: • Permitting and design are required for new culvert installation or expansion of existing culverts over streams and wetlands. Significant regulatory requirements must be followed. Permitting restrictions on time of year use. • Installation may require in-stream work; dewatering and sedimentation concerns. • Culverts are susceptible to washouts, sedimentation, erosion, and failure during heavy wet-weather events and flooding. • Culverts require routine and long-term maintenance because they often become clogged with debris or other obstructions. Overview: Culverts are installed to maintain wetlands or streams at road crossings. Hydraulic calculations are required at all crossings to determine the area that will drain to the culvert. General Design Guidelines: • Size culverts to handle the maximum expected flow of the wetland or watercourse. It is preferable to have one large culvert rather than multiple culverts. Corrugated culverts are favored because they slow the water velocity. HDPE corrugated pipes are preferred to metal. • Design culverts to withstand and accommodate high flows while maintaining existing low flows and not impeding on the movement of indigenous aquatic life. Culverts must be sized to accommodate flows from at least the 100-year storm and preferably 500-year storm. • The maximum velocity at the culvert outlet should be consistent with the velocity of the natural channel. To mitigate higher velocities, use outlet protection measures, energy dissipation, and channel stabilization, if necessary. • Refer to state specific stream crossing guidance documents for additional design requirements: o Connecticut: Stream Crossing Guidelines, CT DEEP, Inland Fisheries Division Habitat Conservation and Enhancement Program, February 26, 2008 (www.ct.gov/deep/lib/deep/fishing/restoration/streamcrossingguidelines.pdf) o Massachusetts: Massachusetts River and Stream Crossing Standards, River and Stream Continuity Partnership, March 1, 2006, Revised March 1, 2011 (https://www.nae.usace.army.mil/Portals/74/docs/regulatory/StreamRiverCo ntinuity/MA_RiverStreamCrossingStandards.pdf) Installation: • Construction mats may be placed over culverts to provide structural protection from heavy loads. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-24 • Backfill culverts with natural substrate matching the upstream and downstream streambed substrate, even when fish passage is not a concern. Other aquatic organisms rely on natural streambed sediment to aid their movement. • Strive to install culverts with minimal disruption to the watercourse and riparian buffer zone. • Culvert length should be as short in length as practicable. Cut culverts to size if they are protruding into the natural streambed. Maintenance: • Remove debris and sediment from culverts to maintain an open channel for flow. A clogged culvert could result in flooding and washout. Pole Fords Applications: Stream Crossings Limitations: • Limited to streams with gently sloping adjacent land. Overview/Use: • Poled fords are used in remote locations where a stream crossing requires a functional BMP, but it is impractical to bring in larger materials. Sufficiently sized wood poles or saw logs of may be laid in the streambed parallel to the flow. • Gently slope the road to and from the streambed at a maximum ratio of 1:5 (V:H). To limit disturbance to the riparian area, install engineering fabric and cover with an aggregate bed at the approach and exit. • Use poles with a minimum length of ten feet. • Remove poles immediately after use. 3.9 Slope Excavation Engineering designs may be required for any changes in upland areas that could potentially direct or channel water across the face of slopes, particularly terrace escarpments or other highly erodible soils. No snow or soil piles, construction materials, or equipment should be stored in the immediate vicinity at the top of the terrace escarpment or other highly erodible soils. 3.10 Vegetation Removal and Preservation Care should be taken to limit disturbance to the extent practicable when removing vegetation. Grubbing is not preferred as it results in considerable ground disturbance that could result in erosion and should be avoided to the extent feasible. Utilize grubbing only when all other methods cannot be used to prepare stable and safe work areas. If grubbing is necessary, the area must be seeded and mulched to protect it prior to the end of the workday. During mowing and trimming, woody debris greater than two (2) inches in diameter should not be placed in wetlands, and no woody debris should be placed in standing water. Permit conditions may mandate all woody debris to be removed from sensitive environmental areas. Mowing must be kept to a minimum, particularly at road crossings. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-25 3.10.1 ROW Vegetation and Eastern Box Turtle (EBT) – MA only Eastern box turtles (EBT) are often found near small streams and ponds and inhabit old fields, deciduous forests, and logged woodlands. Adults are completely terrestrial, while the young may be semiaquatic. EBTs hibernate on land by digging down in the soil between October and April. They have an extremely small home range and can usually be found in the same area year after year. EBT populations have been negatively impacted by the loss of suitable habitat. Some turtles may be killed directly by construction activities, but many more are lost when important habitat areas for shelter, feeding, hibernation, or nesting are destroyed. As remaining habitat is fragmented into smaller pieces, turtle populations can become small and isolated. Turtles are long-lived and the loss of even a single adult turtle can negatively impact the persistence of a local population. Therefore, vegetation removal in ROWs should be performed in a manner that minimizes impacts to turtle populations. Cleared and Maintained ROW—EBTs have been found to use existing ROWs for foraging and nesting. Whenever feasible, perform maintenance mowing in identified habitat during inactive periods (November 1st to March 31st). Turtle BMPs are not required for work performed during the inactive period. If mowing during the active turtle season (April 1 st to October 31st) is required, turtle sweeps should be conducted by trained personnel prior to mowing activities; mow vegetation to no lower than seven (7) inches. Use Brontosaurus or Fec on mower heads to minimize the impact to identified habitat areas. Do not used Flail -type mowers during the active season. Additionally: • Avoid direct harm to turtles. Visual inspections (“turtle sweeps”) of the work area must be conducted by trained personnel prior to the commencement of work. If turtles are encountered, they should be removed from the work area and reported to NHESP. Use extra care when using heavy machinery or traveling in vehicles through areas mapped as turtle habitat. Any silt fencing used in these areas should be removed as soon as site stabilization has occurred; fencing can be a barrier to turtle movements . Alternatively, install silt fencing in accordance with the Syncopated Silt Fence detail (see Appendix A). If required, excavation should be completed within one (1) day and/or open excavations should be backfilled daily to prevent turtles from becoming trapped. Uncleared ROW—When project work requires vegetation removal in an uncleared ROW, cut and mow uncleared portions of EBT habitat during the active season (April 1st to November 1st). If clearing must be conducted during hibernation periods, pre-planning will involve conducting a turtle survey and the possible use of telemetry. Consult Eversource Environmental Licensing and Permitting before performing work because this activity may not be covered under the OMP and may require a permit. 3.10.2 ROW Vegetation and Other Protected Turtles In addition to EBTs, some ROWs overlap with known habitat of other protected species of turtles. In Massachusetts, these species include Blanding’s Turtle, Bog Turtle and Northern Red-bellied Cooter. If any work, including but not limited to vegetation Section 3 Construction Considerations Eversource Best Management Practices Manual 3-26 management, is scheduled to occur in the habitats of these turtles at any time of the year, avoid wetland work. If unavoidable, operation and maintenance work in wetlands should be minimized to the greatest extent practicable. If work must occur in wetlands, the following guidelines apply: • Any work should be reported to NHESP • Work within wetlands mapped as habitat for the Bog Turtle or Northern Red - bellied Cooter must be reviewed on an individual basis by NHESP. Recommended Maintenance Activity if the Existing ROW is: Time Period Turtle Status Cleared and Maintained Uncleared April 1 to November 1 Active Perform only if required— Mow vegetation no lower than seven (7) inches and use recommended mower heads Recommended—Cut and mow uncleared areas November 1 to April 1 Inactive Recommended—Perform maintenance mowing Not recommended— Requires turtle survey at minimum before removing vegetation General Construction Recommendations –The following are general construction guidelines for protecting turtles: • Install silt fencing around the work area prior to construction activity. Consider using syncopated silt fencing (see Figure A23 in Appendix A). • Turtle training is required for all contractors. Apprise workers of the possible presence of turtles and provided a description of the species. Include a turtle sweep reminder on the Daily Tailboard. • Conduct a turtle sweep after installing silt fencing and before conducting work. • Perform daily turtle sweeps in work areas before performing any work. • Carefully move any turtles that are discovered to an area immediately outside of the fenced area. Position turtle in the same direction that it was walking. • Perform work with caution during early morning and evening hours. Take special care not to harm basking or foraging individuals. • Remove silt fencing after work is completed and soils are stable so that reptile and amphibian movement between uplands and wetlands is not restricted. • Return temporary cross-country access routes to pre-construction grade, seed if adequate root and seed stock are absent, and mulch. Do not seed pre -existing sandy soils that are within mapped rare turtle habitats unless directed by Eversource Environmental Licensing and Permitting in order to avoid alte ring nesting habitat. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-27 3.10.3 Preservation of Existing Vegetation Preserve the existing vegetation (i.e., groundcovers, vines, shrubs, trees) when practicable to improve soil stability and decrease the runoff volume and velocity. Identify and protect specified trees for erosion and sediment control benefits and /or aesthetic purposes. Consider saving trees that provide shading or screening benefits, particularly in residential areas. Preserve existing vegetation by reducing the width of a cleared ROW at stream crossings. 3.10.4 Invasive Plant Species Invasive plant species are non-native species that invade natural communities and develop self-sustaining populations. The start of many infestations is often tied to a disturbance, and once established, the invasive species spread into undisturbed landscapes. They out-compete native species, disrupting ecological p rocesses, and cause a loss of economic value or output. It is illegal to transport, to introduce, and/or propagate state-listed invasive species. Cleaning, draining and drying equipment between sites is mandated for aquatic invasives, and recommended for t errestrial equipment. Power washing of equipment and gear between sites is recommended, where feasible. At a minimum, visual inspection and hand removal of any plants, seeds, propagules, insects, mud, etc. is encouraged to maintain compliance with state la ws and rules. The linear nature of utility maintenance activities in vegetated corridors entails that a range of vegetative communities may be encountered by equipment, vehicles and personnel during the course of a single maintenance project or when mobilizing from one project site to another. It is especially important to follow best management practices when mobilizing equipment, vehicles and personnel from an area infested with invasive species to an un-infested area. 3.10.4.1 Project Planning – Invasive Plant Species Prior to starting utility maintenance work, the project area should be evaluated to determine: • Do invasive plant species exist in the project area? • Do project activities have the potential to contact invasive plants or disturb soils in a manner that could potentially spread live plant parts or viable seeds? • If invasive species are not present, or if it is not possible or not feasible to identify invasive plant species within the project area, follow best management practices to minimize the disturbance and spread of soil and/or plant matter. 3.10.4.2 Species Identification It is imperative that workers who will be working or operating equipment in areas that may contain invasive plant species be trained in the identification and modes of dispersal of common, highly-prolific aquatic and terrestrial invasive plant species commonly found along road sides and in utility ROWs. See tables below for identification of the common invasive plants in Connecticut and Massachusetts. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-28 Invasive Species in Massachusetts1 Botanical Name Common name Aegopodium podagraria Bishop’s goutweed; bishop’s weed Acer platanoides Norway maple Acer pseudoplatanus Sycamore maple Ailanthus altissima Tree of heaven Alliaria petiolata Garlic mustard Berberis thunbergii Japanese barberry Cabomba caroliniana Carolina fanwort; fanwort Celastrus orbiculatus Oriental bittersweet; Asian or Asiatic bittersweet Cynanchum louiseae Black swallow-wort; Louise’s swallow-wort Cynanchum nigrum – see Cynanchum louiseae Black swallow-wort; Louise’s swallow-wort Elaeagnus umbellata Autumn olive Euonymus alatus Winged euonymus; burning bush Euphorbia esula Leafy spurge; wolf's milk Fallopia japonica - see Polygonum cuspidatum Japanese knotweed; Japanese or Mexican bamboo Ficaria verna - see Ranunculus ficaria Lesser celandine; fig buttercup Frangula alnus European buckthorn; glossy buckthorn Glaucium flavum Sea or horned poppy; yellow hornpoppy Hesperis matronalis Dame’s rocket Iris pseudacorus Yellow iris Lepidium latifolium Broad-leaved pepperweed; tall pepperweed Lonicera japonica Japanese honeysuckle Lonicera morrowii Morrow’s honeysuckle Lonicera x bella [morrowii x tatarica] Bell’s honeysuckle Lysimachia nummularia Creeping jenny; moneywort Lythrum salicaria Purple loosestrife Myriophyllum heterophyllum Variable water-milfoil; two-leaved water- milfoil Myriophyllum spicatum Eurasian or European water-milfoil; spike water-milfoil Nasturtium amphibium - see Rorripa amphibia Water yellowcress; great yellowcress Nasturtium officinale - see Rorripa nasturtium- aquaticum Phalaris arundinacea Reed canary-grass Phragmites australis Common reed Section 3 Construction Considerations Eversource Best Management Practices Manual 3-29 Invasive Species in Massachusetts1 Botanical Name Common name Polygonum cuspidatum Japanese knotweed; Japanese or Mexican bamboo Polygonum perfoliatum Mile-a-minute vine or weed; Asiatic tearthumb Potamogeton crispus Crisped pondweed; curly pondweed Ranunculus ficaria Lesser celandine; fig buttercup Reynoutria japonica – see Polygonum cuspidatum Japanese knotweed; Japanese or Mexican bamboo Rhamnus cathartica Common buckthorn Rhamnus frangula – see Frangula alnus European buckthorn; glossy buckthorn Robinia pseudoacacia Black locust Rorippa amphibia Water yellowcress; great yellowcress Rosa multiflora Multiflora rose Salix atrocinerea/Salix cinerea Rusty Willow/Large Gray Willow complex Sisymbrium amphibium - see Rorripa amphibia Water yellowcress; great yellowcress Trapa natans Water-chestnut Vincetoxicum nigrum – see Cynanchum nigrum Black swallow-wort; Louise’s swallow-wort 1 Based on the Massachusetts Invasive Plants Advisory Group (MIPAG); Last Updated 6/2021 Invasive Species in Connecticut1 Botanical Name Common name Acer platanoides Norway maple Aegopodium podagraria Goutweed/Bishops Weed Ailanthus altissima Tree of heaven Alliaria petiolata Garlic mustard Ampelopsis brevipedunculata Porcelainberry Artemisia vulgaris Mugwort Berberis thunbergii Japanese barberry Berberis vulgaris Common barberry Cabomba caroliniana Fanwort Cardamine impatiens Narrowleaf bittercress Celastrus orbiculatus Asiatic bittersweet Centaurea stoebe Spotted knapweed Cynanchum louiseae Black swallow-wort Section 3 Construction Considerations Eversource Best Management Practices Manual 3-30 Invasive Species in Connecticut1 Botanical Name Common name Cynanchum rossicum Pale swallow-wort Elaeagnus umbellata Autumn olive Euonymus alatus Winged euonymus Euphorbia esula Leafy spurge Frangula alnus Glossy Buckthorn Froelichia gracilis Slender snake cotton Hesperis matronalis Dame’s rocket Hydrilla verticillata Hydrilla Iris pseudacorus Yellow iris Lepidium latifolium Perennial pepperweed Lonicera japonica Japanese honeysuckle Lonicera maackii Amur honeysuckle Lonicera morrowii Morrow’s honeysuckle Lonicera x bella Belle honeysuckle Lythrum salicaria Purple loosestrife Microstegium vimineum Japanese stiltgrass Myosotis scorpioides Forget-me-not Myriophyllum heterophyllum Variable-leaf watermilfoil Myriophyllum spicatum Eurasian watermilfoil Phalaris arundinacea Reed canary grass Phragmites australis Common reed Polygonum caespitosum Bristled knotweed Polygonum perfoliatum Mile-a-minute vine Potamogeton crispus Curly-leafed pondweed Ranunculus ficaria Fig buttercup Rhamnus cathartica Common buckthorn Robinia pseudoacacia Black locust Rosa multiflora Multiflora rose Rubus phoenicolasius Wineberry Trapa natans Water chestnut Tussilago farfara Coltsfoot 1 Based on the Connecticut Invasive Plants Council in accordance with Connecticut General Statutes §22a-381a through §22a-381d. The list was most recently re-printed in October 2018. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-31 Avoidance and Minimization • If possible, avoid or minimize contact with invasive species by physically avoiding locations with invasive plant infestations. • In locations where invasive infestations exist, design the project to minimize contact with invasive species by choosing access routes and staging areas that are outside areas of infestation. • Sequence work to the extent possible such that work using clean equipment and materials proceeds in un-infested areas prior to moving into infested areas and not vice versa. • If it is unknown whether invasive species exist, design the project to limit travel across vegetated areas to the extent possible. • When possible, time work under conditions that minimize the risk of spread, (frozen ground, snow cover, absence of seeds or propagules). Vegetation Management • Control of invasive plants by chemical means should be performed by a licensed applicator in accordance with the requirements of the CT DEEP Pesticide Management Program, the Massachusetts Pesticide Control Act (MPCA; M.G.L. Chapter 132B) and 333 CMR 2.00, ROW Vegetation Management regulations (333 CMR 11.00), and the MAWPA. • Mechanical mowing of vegetation should adhere to principals of avoidance and minimization. Where possible avoid mowing invasive plants, especi ally plants that have the ability to sprout from stem and root fragments. For other invasive species, mowing should occur prior to seed set if possible. • If woody vegetation is removed from a project site, transport it in compliance with invasive pest or disease quarantine zones established by the United States Department of Agriculture (USDA), the Connecticut Agricultural Experiment Station, MA DCR, and MA DAR. • Any restoration seed mixes used should be free of any species identified as invasive by the Connecticut Invasive Plants Council in accordance with Connecticut General Statutes §22a-381a through §22a-381d (in Connecticut) or the Massachusetts Invasive Plants Advisory Group (in Massachusetts). Soil Disturbance and Management • Where possible, avoid soil disturbance as it may increase the chances of colonization by invasive seeds or propagules. • Stabilize disturbed soils as soon as possible by seeding and/or using mulch, straw or gravel that is free of invasive plant material. • Where possible, when excavating soils, top layers of soil containing plant material and roots should be segregated from sub soils and left on site. • Cover soil and other material containing invasive plant material during transport. • Do not transport fill and material containing invasive plant material onto a project site. • If fill and materials containing invasive species must be transported off site, do not reuse, stockpile or dispose of these materials in such a manner that could promote Section 3 Construction Considerations Eversource Best Management Practices Manual 3-32 the spread of invasive plants. Decontamination Procedures • When utility maintenance activities require work in areas infested with invasive species, implement decontamination procedures per NHDOT’s Best Management Practices for Roadside Invasive Plants manual. • In order to minimize the spread of invasive plant seeds and material: o Clean vehicles, equipment, materials, gear, footwear or clothing of all visible soil and plant material on site in the infested area, or as near as practical to the infested area, prior to leaving the project site. o Do not decontaminate equipment next to streams or water bodies that could potentially transport seeds or propagules. o Decontaminate equipment and materials that may be contaminated by aquatic plant materials adjacent to the surface water they were exposed to prior to use in another surface water body. o Do not transport water withdrawn from a surface water body and discharge it to another water body. Methods of Cleaning • Use a brush, broom or hand tools to manually clean. • Clean debris off equipment such as construction matting by shaking or dropping mats in a controlled manner to dislodge attached soil and debris. • Compressed air. • Containment must be in compliance with wastewater discharge regulations when using low-or high-pressure wash stations. 3.11 Work Pads 3.11.1 De-Energized and Energized Applications: Work in wetlands • Reconnaissance of each work pad area in or adjacent to wetlands should be performed to determine if the construction mat work pad areas could be located outside of wetland resource areas. Wetland disturbances should be avoided or minimized where practicable. Coordinate work pad locations and/or configurations with Eversource Environmental Licensing and Permitting. Limitations: • Requires heavy machinery for installation. • Significant amount of time required for installation and removal. • Pads for live line work require a considerably larger footprint. • Several layers of matting may be needed in deep, construction areas. • Animals may be injured or killed when attempting to cross work pads. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-33 • May not be suitable in deep/open water wetlands. • Must be underlain with non-woven geotextile if within an ORW (MA only). How to Use: • Work at structures may require placement of construction mats to provide safe and stable work pad areas for employees and contractors. • Live line work, which is work that is done while the line is energized, requires a much larger work pad area. Efforts should be avoid or minimize impacts to wetlands to the extent practicable. • Sizes of work pads vary based on the type of work being proposed. • Work pad areas may extend into wetlands where structures that require maintenance either fall within or are in proximity to wetlands. In these cases, untreated wooden construction mats shall be used to limit disturbance. • Install silt fencing around work pads in identified amphibian and reptile priority habitat and where matting is greater than one mat thick. The exclusionary silt fencing will deter animals from moving across work pads and reduce the likelihood of being crushed by heavy equipment. • Following construction activities all mats at each work pad and vehicle access locations must be removed. • Remove mats by “backing” out of the site and removing mats one at a time. Regrade soils to pre-existing contours while taking care not to compact soils, if necessary. • In areas with invasive species, plant material should be removed from mats following removal from the infested area to prevent the spread of invasive species. Refer to the tables in this section for additional details regarding invasive plant species. 3.11.1.1 Best Management Practices – Work Pads De-energized work requires smaller work pad areas, while live line work (i.e., work that is done while the line is energized) requires a much larger work pad areas. De-energized construction mat work pads (see Figure A14 Appendix A) 3.12 Structure-Related Work 3.12.1 Wetland Structure-related activities that may occur in wetlands include structure replacement/ installation (including casing installation), guy wire anchor installation, counterpoise installation, and pole butt removal. Access to these areas and completion of the activities can cause disturbance to wetland vegetation and soils. Therefore, structure-related activities in wetlands should entail use of adequately sized work pads and proper dewatering methods if/as needed. Inspection of the construction access and asso ciated dewatering measures should occur daily during construction to ensure that controls are in working order and repairs to damaged/deteriorating controls are made in a timely matter. Repairs may include re-grading the traveled surface to eliminate ruts as well as those repairs required by each erosion and sedimentation measure used. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-34 Structure Replacement/Installation Replacement structures will often be replaced within a few feet of the original structure to maintain the required distances and line sags between other existing structures. Therefore, options for relocating proposed replacement structures are limited. Pole replacement will also require placement of construction mats in wetlands to provide a safe work pad for the required structure replacement activities. Usually, there are no alternatives that allow for this work to be conducted from nearby upland areas or to install the replacement structures in upland areas. Each structure replacement area should be assessed to determine the required footprint needed for construction mat work pads. Typical installation is as follows: • At each pole location, remove wetland topsoil with an excavator and stockpile. Segregate wetland soils as necessary. • If a borehole is drilled, collect and dispose of drilling spoils in an upland area. • A galvanized steel casing is then driven into place at least 12 inches below the ground surface. The new pole is installed within the casing with a crane. The casing is then backfilled with crushed rock and compacted. • Stockpiled wetland topsoil is placed above the casing to the ground surface. No net fill in wetlands occur, as the original poles are removed. • Following installation of the new structures, the old structures are removed. Each pole is cut with a chainsaw and allowed to fall to the ground, which in wetland areas is protected by construction mats. If the pole is to be bucked into sections, conduct sawing activities in uplands when feasible. Pole butts will remain in place; if removing the pole butt will cause more damage than if left in place. • Remove the pole and all appurtenant accessories (e.g., cross-arms, insulators) and properly dispose off-site. Remove each pole butt by pulling with an excavator positioned on a construction mat. If it is apparent that pole removal will compromise the integrity of the new pole installation, or that removal will result in additional disturbance to wetland areas, cut off the old pole at least 12 inches below ground level and backfill to match adjacent grades. Guy Wire Anchor Installation Guy wire anchors supporting the structures may also require replacing. There are two types of anchors: 1) helical and 2) plate type. Helical anchors are preferred over plate anchor because the installation of the helical anchor results in less disturbance to the wetland. • Load test the existing anchor to determine whether it will support the pole structure. Consult with Eversource Engineering to determine load testing requirements. In the event the existing anchor cannot be re-used, remove it and install a new anchor. • Screw in place a special triple helix (“screw type”) anchor with an anchor installation rig operated from the matting area. Add rod sections as needed until proper holding capacity of the anchor is achieved. Consult with Eversource Engineering to determine anchor installation requirements. o Helical anchors are turned into the ground with only the rods protruding. Disturbance to the wetland from the helical anchor is minimal. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-35 • Plate anchors are used in wetlands when proper holding cannot be achieved with screw anchors. To install a plate anchor, a pit is excavated to a sufficient depth and if necessary, a concrete footing would be installed several feet below surface grade. Consult with Eversource Engineering to determine plate anchor installation requirements. o When excavating to install plate anchors, segregate the top 12 inches of wetland topsoil from the underlying material. When the plate anchor has been set, backfill the excavation with underlying material. Utilize segregated wetland topsoil to restore pre-construction grades. Counterpoise Installation/Grounding To install grounding equipment in wetlands, use hand digging or minimally invasive methods to dig around the structure and restore soil to previous grades. In some cases, grounding rods can be driven directly into the ground with hand tools. Where work is occurring in the vicinity of wetland areas, sedimentation and erosion controls will be used to limit disturbance to wetlands. Underground Facility Repair/Replacement Underground facilities such as cables and conduits may be present beneath wetland areas. In the event underground facilities require repair, BMPs are required for both access and construction. Construction mats are used for access where warranted, and sedimentation and erosion controls are used to isolate the work area. During excavation activities, excavate wetland topsoil and stockpile separately from subsurface soils. Dewatering is often required during excavation and repair activities. An alternative to repairing a subsurface line by excavation is to install a new line via trenching or horizontal directional drilling (HDD). The decision to use one of these alternatives is made on a case by case basis. Consult with Eversource Environmental Licensing and Permitting to determine if any permits will be needed. Pole Butt Removal When transmission poles are decommissioned or otherwise taken out of service, in most cases the entire pole shall be removed. Treated wood pole butts shall be removed completely from the ground and properly disposed at an off-site location. Locations where the removal of pole butts may cause significant disturbance to wetlands or other sensitive environmental areas will be considered for exception to this practice on a site -by-site basis. The Transmission Line Construction and Maintenance Manager, in consultation with Eversource Environmental Licensing and Permitting, will be responsible for determining if a pole butt can be removed if located in a sensitive environmental area. All pole butt holes must be backfilled and compacted (every 3 feet) with appropriate fill material. Existing material on-site can be reused if it does not include materials that can rot (e.g., vegetation) and cause settling. Disposal Treated and non-treated wood products owned by the Transmission Group shall be stored in an area(s) designated by the Transmission Line Construction/Contract Field Services Supervisor until collected by an approved disposal vendor. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-36 Concrete Wash Outs Concrete wash outs shall be used for the management of concrete waste. Concrete and concrete wash out water shall not be deposited or discharged directly on the ground, in sensitive environmental areas, or in catch basins or other drainage structures. Where possible, concrete wash outs shall be located away from sensitive environmental areas, including buffer zones. Consult with Eversource Environmental Licensing and Permitting to determine concrete wash out locations prior to their use. Following the completion of concrete pouring operations, the wash outs shall be properly disposed of off-site with other construction debris. 3.13 Underground Cable and Gas Piping-Related Work Gas piping-related activities will typically occur within roadways or along roadway shoulders. There may be some instances where wetland permitting is required when wetlands are located adjacent to or in the vicinity of roadways. However, when work is performed within the roadway/shoulder, permitting is typically not required. Verify permitting requirements with Eversource Environmental Licensing and Permitting. In all cases, BMPs should be followed to ensure environmental compliance. Typical examples of underground cable and conduits include: High-Pressure, Fluid-Filled Pipe-Type Cable: A high-pressure, fluid-filled (HPFF) pipe-type of underground transmission line, consists of a steel pipe that contains three high-voltage conductors. The fluid also transfers heat away from the conductors. The fluid is usually static and removes heat by conduction. XLPE Cable (cross-linked polyethylene): Hydronic tubing that is manufactured from polyethylene plastic with a three-dimensional molecular bond that is created within the structure of the plastic. The cross-linked polyethylene (XLPE) underground transmission line is often called solid dielectic cable. The solid dielectric material replaces the pressurized liquid or gas of the pipe-type cables. XLPE cable has become the national standard for underground electric transmission lines less than 200 kV. Roadways and Shoulders When working in roadways, particularly in residential areas, the following activities should be performed in addition to standard construction BMPs: • Repave disturbed paved areas and return to original elevations on the same day that construction is performed. • Restore all non-paved areas to pre-existing (or improved) conditions. Replace any sod or other plantings in kind or with an acceptable alternative. • Employ dust control as necessary to minimize airborne dust. • Streets should be swept daily or as necessary to remove dirt and debris from resulting from construction from the roadway surface. Dirt and debris swept from the roadway surface should be collected and prope rly disposed of as construction waste. Under no circumstances should dirt and debris be swept off of the roadway surface to the road shoulder or deposited in any catch basins. • Discharge trench dewatering volumes to an appropriate dewatering structure setu p on adjacent undeveloped, unimproved uplands away from wetlands (refer to Appendix A). Consult with Eversource Environmental Licensing and Permitting staff Section 3 Construction Considerations Eversource Best Management Practices Manual 3-37 to determine appropriate locations for placement of dewatering structures. • Trench dewatering may also be discharged to areas of open trench to allow for infiltration. • For minor volumes or short-term duration dewatering needs, trench dewatering may be pumped to frac tanks for transport off-site and discharge to an appropriate dewatering structure located at a contractor yard or similar location. • Trench dewatering may only be discharged to stormwater catch basins after all necessary federal, state and local permits have been obtained to do so (this typically requires design and implementation of an effe ctive treatment system to remove all potential contaminants, such as suspended solids or other chemical contaminants). Consult with Eversource Environmental Licensing and Permitting if discharge to catch basins is required. Under certain circumstances, gas piping must be installed beneath existing culverts within roadways. Take care to ensure that any saturated material excavated from the trench be properly stored and disposed as to not cause sedimentation issues. Implement dewatering methodologies, as required. There may be cases where a drainage ditch or swale must be crossed to gain construction access from paved roads onto ROWs along the roadway shoulder. Install construction mats, mat bridges, or temporary culverts, as necessary, t o facilitate access. Culverts should be for temporary use, sized for peak flow, and removed after construction is complete. Consult with Eversource Environmental Licensing and Permitting prior to installation. Bridges and Culverts Attachment of gas piping to bridges or culverts is the environmentally preferable method for crossing a wetland or watercourse. Consult with the appropriate people (engineers, the Department of Transportation (DOT), etc.) to determine if attachment to a bridge or culvert is a technically feasible option at the desired crossing location. Eversource Environmental Licensing and Permitting should also evaluate the impacts to FEMA flood storage quantities and potential Coast Guard permitting requirements. Ensure that proper erosion and sedimentation controls are in place on either side of the bridge or culvert throughout construction. Rivers and Streams There are two primary approaches for crossing a river or stream with a gas pipeline: direct bury (open trenching) and trenchless methods (e.g., HDD, standard bore/pipe jacking). Direct bury methods involve erecting a coffer dam to isolate the work area and redirecting water flow using gravity or pumping to move water from one side of the work area to the other. Direct bury methods have larger direct environmental impacts than trenchless methods. Typical coffer dam examples are included in Figures A42 and A43 in Appendix A. Trenchless methods use specialized equipment to install piping beneath a waterbody (or a major roadway, railroad, etc.). The most common method used for gas piping is HDD which uses remote controlled, steerable drilling equipment to install pipe along a long arc alignment. The drilling process can be divided into three steps: pilot, reaming, and pull- in. The first step is to drill a pilot bore-hole. Next, a larger diameter fly cutter is used to Section 3 Construction Considerations Eversource Best Management Practices Manual 3-38 enlarge the opening. A specialized bentonite slurry drilling fluid is injected into the bore- hole to stabilize the surrounding soil and to lubricate and cool the drill bit. For the final step, a barrel reamer is used to further enlarge the bore -hole and to pull the pipe into place. A notable environmental concern with HDD is called “frac-out.” This occurs when drilling fluid breaks through the soil surface and into the waterbody. Regulatory agencies may require a “frac-out plan” which details preventative controls and response measures should frac-out occur. A typical frac out plan is included in Appendix D; however, HDD contractors should be required to provide a detailed frac-out plan specific to the project and their practices. These plans may be subject to environmental regulatory agency review. Consult with Eversource Environmental Licensing and Permitting for permit requirements. 3.14 Construction Material along the ROW Once a site is prepared by clearing and/or installing erosion and sediment controls, materials may be stored along the ROW prior to the start of construction. Such materials may include the following: piping, poles, cross-arms, cable, insulators, stone, and other engineered backfill materials. In general, the stockpiling of stone and other unconsolidated material on construction mats should be avoided. If it is determined necessary due to access and work pad constraints, the material should be placed on a geotextile fabric and be properly contained with a sedimentation barrier such as straw wattle or bales. No construction materials should be placed in wetlands or other sensitive resource areas. 3.15 Winter Construction 3.15.1 Snow Management Snow should not be stockpiled or disposed in any waterbody or near water supply sources. These include wetlands, rivers/streams, the ocean, reservoirs, ponds, stormwater catch basins, wellhead protection area, in high or medium yield aquifer, or within 200 feet of a private well. In addition to water quality impacts and flooding, snow disposed in surface water can cause navigational hazards when it freezes into ice blocks. Maintain a minimum buffer of 25 feet between any snow disposal area and the high water mark of any surface water. A silt fence or equivalent barrier should be installed between the snow storage area and the high water mark of rivers, streams, ponds, or the ocean. Consult with Eversource Environmental Licensing and Permitting regarding any specific state and local snow management requirements. Avoid disposing of snow on top of storm drain catch basins or in storm water drainage swales or ditches. Snow combined with sand and debris may block a storm drainage system and cause localized flooding. A high volume of sand, sediment, and litter released from melting snow also may be quickly transported through the system into surface water and could also result in fines or a violation. All debris in a snow storage area should be cleared from the site and properly disposed of no later than May 15 of each year. Care shall be taken not to plow road materials away when removing snow. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-39 3.15.2 De-Icing Where permitted, calcium chloride is the preferred de-icing agent when applied according to manufacturer’s guidelines in upland areas. Sand should be used on construction mats through wetland areas. Consult with Eversource Environmental Licensing and Permitting on de-icing agents when working in a facility or substation near resource areas. Many municipalities have specific de-icing agent requirements for work within 100 feet of wetlands and other sensitive environmental areas. 3.15.3 Snow and Ice Management on Construction Mats Promptly and properly remove snow from construction mats to avoid ice formation. Remove snow from construction mats before applying sand to avoid forming ice. A round street sweeping brush mounted on the front of a truck may be an effective way to remove snow from construction mats. Propane heaters may also be suitable solutions for snow removal and/or de-icing of construction mats. Sand should be collected from the construction mats and disposed of in an upland area prior to removing construction mats from wetlands. Once construction mats are removed, wetlands shall be inspected for sand buildup that may have fallen through construction mats. Sand deposited in wetlands or other sensitive environmental areas shall be completely removed by the contractor. Consult with Eversource Environmental Licensing and Permi tting prior to commencing work in wetlands or other sensitive environmental areas. 3.16 Dust Control Dust control measures are used to reduce surface and air movement of dust from exposed soil surfaces during land disturbance, demolition, and construction activities. These practices reduce the amount of dust in the air and decrease the potential for accidents, respiratory problems, and airborne sedimentation. Construction activities should be scheduled appropriately to minimize the amount of site surface exposed at one time in order to reduce the amount of areas requiring dust control. Use dust control measures on disturbed soil surfaces and exposed soil surfaces, especially during hot or dry weather periods and in areas with excessively well-drained soils. Repetitive treatments should be used as needed, or required by permits, and until the surface is permanently stabilized. Type Description/Use Vegetative Cover • Most effective and practical method. • Use in disturbed areas not subject to traffic. • Follow seeding requirements as directed by local guidelines or permit requirements. Stone • Cover soil surface with crushed stone/coarse gravel. Water/Sprinkling • Sprinkle exposed soils until wet (Water trucks may be used depending on size of the site). • Do not excessively wet the soil as this causes run-off and also wastes water. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-40 Barriers • Board fences, wind fences, and sediment fences control air currents and blowing soil. • Wind barriers protect soil downgradient for a distance of ten times the barrier height. • Perennial grasses and stands of existing trees also serve as wind barriers, stressing the importance of planning work phasing properly and minimizing the amount of exposed soil. Plastic Covering • Cover soil piles with sheets of plastic/tarp to minimize dust. Calcium Chloride • Loose, dry granules of calcium chloride may be applied with a mechanical spreader. • Apply at a rate that keeps the surface moist but not high enough to cause water pollution or plant damage. This method should be done under consultation with an expert in order to maintain this balance and to determine if the site is applicable. 3.16.1 Soil Stockpile Management Some projects may involve excavation and stockpiling of soil. Stockpiles should be located outside sensitive areas to the extent practicable and managed to prevent erosion and sedimentation of adjacent areas. Typical measures include the installation of protective measures (e.g., siltation fence and/or straw bales) around the perimeter of the stockpile. The stockpile must be seeded if left in place for more than 30 days. No snow or soil piles, construction materials, or equipment should be stored in the immediate vicinity at the top of a terrace escarpment slope. 3.16.2 Stockpiles on Construction Mats When soil (or gravel) stockpiles must be staged on construction mat work pads in wetlands, stockpiles should be placed atop areas of matting underlain with non -woven geotextile (either directly atop the mats or between layers of matting) to minimize the potential for material to filter through gaps in matting and deposit in wetlands. Use of construction mat stringers as physical barriers at the edge of the work pad should also be considered. These barriers are recommended to minimize the potential for stockpiled material to get pushed off the work pad into wetlands. Consult with Eversource Environmental Licensing and Permitting for site-specific guidance. 3.16.3 Regulated Soils Management When polluted/contaminated soil is encountered, it must be handled in accordance with the appropriate regulatory requirements. In addition to the measures discussed above, contaminated soils should be stockpiled on and covered by polyethylene sheeting. Sheeting used to cover the stockpile should be weighted down to prevent the wind migration of contaminated dust. For soil stockpiles in substations, contact Eversource Environmental Licensing and Permitting. If soil/water must be stored and/or disposed, comply with existing soil and groundwater management guidelines. Coordinate with the Environmental Affairs Department (EAD) to ensure appropriate procedures are followed. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-41 3.16.4 Best Management Practices – Soil Stockpile Management The following BMP is applicable to soil stockpile management and is described at: Soil Stockpile Management (see Figure A19 in Appendix A) 3.17 Anti-Idling Laws Connecticut and Massachusetts have promulgated anti-idling laws for the purpose of improving air quality by reducing unnecessary air pollution from idling vehicles. State Idling Time Limit (in minutes) Connecticut 3 Massachusetts 5 Details of these laws and the statutory exceptions to the limits noted above are presented in the following sections. 3.17.1 Connecticut The Regulations of Connecticut State Agencies (RCSA) section 22a-174-18(b)(3) states: a mobile source shall not operate for more than three (3) consecutive minutes when such mobile source is not in motion except if the vehicle is operating for one of the conditions exempted in the regulation. These exemptions for mobile sources not in motion include: • When a mobile source is forced to remain motionless because of traffic conditions or mechanical difficulties over which the operator has no control. • When it is necessary to operate defrosting, heating or cooling equipment to ensure the safety or health of the driver or passengers . • When it is necessary to operate auxiliary equipment that is located in or on the mobile source to accomplish the intended use of the mobile source. • To bring the mobile source to the manufacturer’s recommended operating temperature. • When the outdoor temperature is below 20 degrees Fahrenheit. • When the mobile source is undergoing maintenance that requires such mobile source be operated for more than three (3) consecutive minutes. • When a mobile source is in queue to be inspected by U.S. military personnel prior to gaining access to a U.S. military installation. 3.17.2 Massachusetts The Massachusetts Anti-Idling Law (M.G.L. Chapter 90, Section 16A and its implementing regulations set forth at 310 CMR 7.11 applies to all vehicles and limits unnecessary engine idling of stopped vehicles to five (5) minutes. This law shall not apply to: • Vehicles being serviced, provided that operation of the engine is essential to the proper repair thereof. Section 3 Construction Considerations Eversource Best Management Practices Manual 3-42 • Vehicles engaged in the delivery or acceptance of goods, wares, or merchandise for which engine assisted power is necessary and substitute alternate means cannot be made available. • Vehicles engaged in an operation for which the engine power is necessary for an associate power need other than movement, and substitute alternate power means cannot be made available provided that such operation does not cause or contribute to a condition of air pollution. SECTION 4 Eversource Best Management Practices Manual 4-1 Section 4 Inspection and Maintenance A pre-construction meeting will be held to discuss how often and who is responsible for monitoring erosion and sediment controls to document their condition and recommend maintenance or other corrective actions, as necessary. All BMPs will be inspected at least once per week during active construction and until disturbed areas have stabilized following post-construction site restoration. Construction sites will be inspected after major storm events (rainfall events greater than 0.25 inches (MA) or 0.50 inches (CT)), or as directed by Eversource Environmental Licensing and Permitting. 4.1 During Construction Construction sites, construction access roads, and the associated erosion and sediment controls should be inspected by the person(s) designated at the pre-construction meeting, as required by permit conditions. Any damage observed must be repaired in a timely manner, at least within 48 hours of observation. Repairs may include re-grading and/or top dressing the surface with additional aggregate to eliminate ruts as well as t hose repairs required by each erosion and sediment measure used. All inspections will be documented in a written report submitted to Eversource Environmental Licensing and Permitting and saved to the project folder. Copies will be distributed to the relevant contractors if/as directed by Eversource Environmental Licensing and Permitting. 4.1.1 Maintenance of Erosion and Sedimentation Controls Spare erosion and sedimentation control materials such as straw wattles, straw bales and silt fencing should be kept on site or be readily available so they may be replaced if they become non-functional due to deterioration or damaged during a storm, extreme water or wind, or other unexpected events. 4.1.2 Rapid Wetland Response Restoration In the event of unintended discharges of sediment into wetlands, Eversource Environmental Licensing and Permitting will direct the contractor(s) to quickly control, contain and remove sediment using non- or marginally invasive methods. Responding quickly to unintended discharges minimizes the difficulty and cost of restoration if the sediment is left in place for an extended period of time. Eversource Environmental Licensing and Permitting will direct sediment removal activities at the time of discharge and will notify the appropriate regulators of the discharge and the recommended corrective actions. 4.1.3 Vehicle Storage and Refueling All storage and refueling of vehicles and other equipment must occur outside of and as far away as practical from sensitive environmental areas such as wetlands, unless specifically authorized by Eversource Environmental Licensing and Permitting and an alternate protocol is developed and approved internally. The recommended minimum distance from wetlands for storage of fuel and refueling is 100 feet. Additionally, equipment should be checked regularly for evidence of leaks. Construction material storage should also be located at least 100 feet from wetlands. Section 4 Inspection and Maintenance Eversource Best Management Practices Manual 4-2 Storage of larger, less mobile equipment such as drill rigs or large cranes, may be permitting within wetlands subject to prior approval from Eversource Environmental Licensing and Permitting. Secondary containment shall be in place at each piece of equipment during non-working hours. Refueling of larger, less mobile equipment such as drill rigs or large cranes, may be allowed within wetlands only with prior approval from Eversource Environmental Licensing and Permitting and if specified precautions and protocols are followed. A proper location for refueling should be identified and designated before site work begins. At a minimum, if refueling must be conducted in wetlands, the contractor shall provide adequate secondary containment during refueling operations and shall maintain a spill kit on-site at all times. 4.1.4 Spills Spill kits consist of emergency cleanup and spill containment materials that can be used in the event of a fuel or other chemical spill. Spill kits must be kept on site and accessible at all times in case of an emergency spill. Such kits should generally contain multiple absorbent socks and/or pillows and wipes and temporary disposal bags. Follow the applicable Eversource Contractor Work Rules. 4.1.5 Post-Construction Post-construction inspections of restored areas will be conducted at regular intervals throughout the growing season, as required by any applicable permits, and/or after major storm events. Sites should be inspected for success or failure of revegetation, invasive species colonization, and erosion and sedimentation. In the event additional measures are required to achieve site restoration and stabilization, corrective actions shall be identified and implemented. All information collected during inspections, regular maintenance, and repair procedures should be documented in project folders. In addition, photogra phic or diagrammatic logs may be kept to record certain events and for documentation of project progress and any noteworthy observations. The construction work is not complete until all areas are restored. SECTION 5 Eversource Best Management Practices Manual 5-1 Section 5 Rehabilitation and Restoration 5.1 Restoration All areas disturbed by construction, repair, and maintenance activities shall be substantially restored to pre-construction conditions. Please refer to Appendix A for photos and typical details for loaming, seeding, and mulching. Prompt restoration minimizes the extent and duration of soil exposure and prot ects disturbed areas from erosion due to stormwater runoff, ice, wind and gravity. Stabilization should be conducted as soon as practicable. Where appropriate, it is preferable to allow sensitive environmental areas, such as wetlands and rare species habitat to revegetate naturally. Consult Eversource Environmental Licensing and Permitting for project-specific restoration requirements. 5.1.1 Seed Mixes Several different seed mixes are available for upland and wetland restoration. State - specific comprehensive summaries of seed mixes for both temporary and permanent seeding of disturbed sites can be found within the following documents: • Massachusetts: Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas, page 157: https://www.mass.gov/doc/complete- erosion-and-sedimentation-control-guidelines-a-guide-for-planners-designers- and/download • Connecticut: 2002 Connecticut Guidelines for Soil and Erosion Sediment Control, page 5-3-8: https://portal.ct.gov/DEEP/Water/Soil-Erosion-and-Sediment-Control- Guidelines/Guidelines-for-Soil-Erosion-and-Sediment-Control Upland Seed Mix: If significant grading or upland alteration has occurred, annual rye grass seed shall be placed for temporary stabilization following manufacturer’s recommendations after re-grading activities. Wetland Seed Mix: If significant grading or wetland alteration has occurred, a wetland seed mix shall be placed following manufacture’s recommendations after re-grading activities. 5.1.2 Upland The following restoration techniques apply to restoration projects in upland areas. • Soil excavated during construction and not used as backfill must be eve nly spread across disturbed areas to restore grades. Topsoil shall be stripped and separated to the extent practicable for re-use. Permanent soil protection shall be provided for all areas disturbed by construction activities. All areas will be seeded either by hydroseeding or broadcast seeding. Interim stabilization measures are required if areas cannot be seeded due to the time of year . Interim measures may include the application of mulch. • Topsoil removed during construction activities will be replac ed, seeded, and mulched. • All areas that are broadcast seeded shall be treated with a layer of mulch, such as Section 5 Rehabilitation and Restoration Eversource Best Management Practices Manual 5-2 straw, up to one (1) inch thick to enhance moisture retention, dissipate disturbance from precipitation, and detract birds foraging on broadcast seed. • Rehabilitation of access routes and other areas must be performed as soon as practicable after construction is completed, including reestablishment of water bars or other BMPs to control erosion of the access road, and the removal and restoration of temporary wetland or waterway crossings. o Temporary breaks in construction activities may warrant seeding and mulching of disturbed areas as interim erosion control measures. Consult with Eversource Environmental Licensing and Permitting to determine project-specific requirements. • Erosion control measures shall remain in place until soils are adequately stabilized, as confirmed by Eversource Environmental Licensing and Permitting. Once soils are stable, erosion controls – especially silt fence, which presents an obstacle to movement of small animals, shall be removed and properly disposed off -site. Stakes should be removed from straw bales and spread as mulch to remove barriers to wildlife movement. • The use of hay and/or hay products is strictly prohibited to prevent the spread of invasive plant species seed stock. • If a grading operation at a site is suspended for a period of more than twenty -nine (29) consecutive days, the disturbed area shall be stabilized by seeding, mulching, and/or other appropriate means within the first seven (7) days of the suspension of grading. • Within seven (7) days after a final grade is established in any grading operation, the disturbed area shall be stabilized by seeding, loaming, and/or other appropriate means. 5.1.3 Wetland/Watercourses Re-grading of Ruts: Upon removal of construction mats, or other BMPs, the wetland/watercourse should be inspected for rutting or disturbance from eroded upland soils. Any rutting should be re-graded to pre-existing contours and upland soils removed from wetland areas while taking care not to compact soils. The following restoration techniques apply to restoration projects in wetlands: Maintenance, Repair, and Emergency Projects (When No Permit is Required) • Remove mats by “backing” out of the site and removing mats one at a t ime. Re- grade soils to pre-existing contours while taking care not to compact soils. • Soils excavated from wetland areas shall be segregated and stockpiled separately (i.e., topsoil/muck apart from mineral subsoil) in a dry/upland area at least 100 feet from wetland boundaries unless other provisions have been made to facilitate restoration activities. • Excavated wetland soils that have been stockpiled during underground utility installations within wetlands shall be replaced in the same order (i.e., mineral subsoil beneath organic topsoil/muck) to the extent practicable and restored to pre-disturbance grades. o Grading activities should include the elimination of ruts within the Section 5 Rehabilitation and Restoration Eversource Best Management Practices Manual 5-3 area to be restored. • If replacement of soil associated with temporary wetland or watercourse crossings for access roads is necessary, disturbed areas must be restored to pre-disturbance grades, either seeded and mulched, or allowed to revegetate from the natural seed bank. • Disturbed wetland areas shall generally be allowed to revegetate from the natural seed bank. Measures to discourage the establishment or spread of plant species identified as non-native, invasive species by federal or state agencies shall be utilized. Consult with Eversource Environmental Licensing and Permitting to evaluate means and methods of wetland vegetate re-establishment. • Any restoration plantings or seed mixes used in restoration shall consist of species native to the project area and, if feasible, from local nursery stock. • Any stream banks and beds damaged shall be restored through use of 100 percent natural fiber geotextile erosion control blankets and/or coir logs. The use of erosion control products containing plastic and/or nylon is strictly p rohibited. • All seeded areas shall be treated with a layer of mulch (i.e., straw; the use of hay and/or hay products is strictly prohibited) up to one (1) inch thick to enhance moisture retention, dissipate disturbance from precipitation, and detract songbi rds foraging on broadcast seed. 5.2 Private Property 5.2.1 Improved Areas If access is over an off-ROW property, then it is the responsibility of a construction representative to determine if legal access rights are available to cross the property. Access to and along the ROW over private property must be improved to the extent necessary to ensure suitable passage for construction equipment, provide erosion control, and maintain proper drainage. Upon completion of construction activities, altered yards, lawns, agricultural areas, and other improved areas must be restored to a condition equal to or better than before their use for the construction project. 5.2.2 Overall Work Site Construction personnel should remove all work-related trailers, buildings, rubbish, waste soil, temporary structures, and unused materials upon satisfactory completion of work. All areas should be left clean, without any litter or equipment (e.g., wire, pole butts, anchors, insulators, cross-arms, cardboard, coffee cups, water bottles) and stabilized to match pre- construction conditions to the maximum extent practicable. Debris and spent equipment should be returned to the operating facility or contractor staging area for disposal or recycling as appropriate. 5.2.3 Material Storage/Staging and Parking Areas Upon completion of all work, all material storage yards, staging areas, and parki ng areas shall be completely cleared of all waste and debris. Unless otherwise directed or unless other arrangements have been made with an off-ROW or off-property owner, material storage yards and staging areas shall be returned to the condition that exis ted prior to the installation of the material storage yard or staging area. Regardless of arrangements Section 5 Rehabilitation and Restoration Eversource Best Management Practices Manual 5-4 made with a landowner, all areas shall be restored to their pre-construction condition or better. Any temporary structures erected by the contractor, inc luding fences, shall be removed by the contractor and the area restored as near as possible to its original condition, including seeding and mulching as needed. 5.3 Work in Agricultural Lands Transmission lines often cross agricultural lands. In some instances, this may affect ongoing agricultural activities in and around the ROWs. If a construction or maintenance project occurs within agricultural lands, Eversource will work closely with landowners, licensees and stakeholders to minimize agricultural impacts. Whenever practical, Eversource will make reasonable efforts to coordinate the schedule of construction-related activities around the growing and harvest seasons to minimize the impacts on agricultural operations. When this is not practical, Eversource will pursue reasonable measures to mitigate any impacts. Eversource recognizes that disturbed soils, or soils compacted by heavy construction equipment, may affect the soil’s ability to support certain agricultural activities. Eversource will take reasonable steps to avoid or minimize soil compaction an d will restore soils that are compacted by construction equipment. Typical measures to avoid or minimize soil compaction include the use of construction mats for access to, and work pads at, structures within the project scope. Eversource will also work with affected landowners to determine the appropriate method for restoring the soils and is open to discussing and implementing the landowners’ alternative restoration suggestions. After the transmission improvement is complete, Eversource will remove all construction-related equipment and debris from the ROW. APPENDIX A EXISTING ROADWAY ELEVATION VIEW PLAN VIEW DITCHFLOW FLOWF LOW FLOW CONSTRUCTION ACCESS ROAD CONSTRUCTION ENTRANCE TRACK PAD SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Const Entr.dwgDec 15, 2021-3:23pm Plotted By: ASapelli12/2021 NO SCALE LEVEL TO EXISTING GRADECRUSHED AGGREGATE TEMPORARY CULVERT IF NEEDED CRUSHED AGGREGATE NOTES: 1. CRUSHED AGGREGATE TO CONSIST OF 3-INCH TO 6-INCH STONE. 2. AGGREGATE TO BE UNDERLAIN WITH NON-WOVEN GEOTEXTILE FABRIC. NON-WOVEN GEOTEXTILE A01 A-1 WATER BARS SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Water Bars.dwgDec 15, 2021-3:21pm Plotted By: ASapelli12/2021 NO SCALE ROA D S U R F A C E WATER FLOWS OFF ROAD ONTO LEVEL SPREADER/VEGETATED SURFACE NOTE: FILL FOR BERMS SHALL BE A COMBINATION OF GRAVEL, SAND AND SILT TO ENSURE WATER TIGHTNESS AND STABILITY. 6' MIN.9"COMPACTED BERM EXCAVATED SWALE 18"ROAD SURFACE ELEVATION VIEW COMPACTED BERM A02 A-2 VEGETATED SWALES SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Vegetated Swale.dwgDec 15, 2021-3:30pm Plotted By: ASapelli12/2021 NO SCALE DRAINAGE SWALE AT ROADWAY 2'2'2'1'1' 2 1 2 1 4" TOPSOIL & SEEDED EXISTING GRADE ROADWAY EROSION CONTROL BLANKET VARIES 3'VARIES GRASS-LINED CHANNEL 4" TOPSOIL & SEEDED2 1 2 1 NOTE: 1. USE OF PRODUCTS WITH PLASTIC AND/OR NYLON NETTING IS PROHIBITED. A03 A-3 ALTURNAMAT SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Alturnamat.dwgDec 15, 2021-3:21pm Plotted By: ASapelli12/2021 NO SCALE 4 ' 8' PLAN VIEW ELEVATION VIEW INDIVIDUAL MAT UTILITY POLE MUDDY/UNSTABLE GROUND IN OR NEAR WETLAND AREA UTILITY POLE A04 A-4 R PLAN VIEW ELEVATION VIEW CONSTRUCTION MAT (WETLAND CROSSING) SCALE: DATE: FIGURE:Tighe & Bond, Inc. J:\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Construction Mat-Wetland-A1.dwgApr 07, 2022-2:19pm Plotted By: AGordon12/2021 NO SCALE NOTES: 1.CONSTRUCTION MAT DIMENSIONS OF 12'x4'x8", 16'x4'x8" OR OTHER TO BE USED. EXISTING GRAVEL FILL (WHERE PRESENT) (8'-12' WIDE) INDIVIDUAL MAT TRANSVERSE CONSTRUCTION MATS EXISTING GRAVEL FILL (WHERE PRESENT) (8'-12' WIDE) MUDDY/UNSTABLE GROUND IN OR NEAR WETLAND AREA UPLAND DIRECTION OF TRAFFIC WET/MUDDY AREA A05 CONSTRUCTION MATS PLACED LONGITUNINALLY ALONG WHEEL TRACKS A-5 CONSTRUCTION MAT - AIR BRIDGE SCALE: DATE: FIGURE:Tighe & Bond, Inc. J:\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Elevated Animal Crossing.dwgNov 22, 2021-2:28pm Plotted By: TMP12/2021 A06 NO SCALE PLAN VIEW ELEVATION VIEW 10'± CONSTRUCTION MATS GROUND SURFACE 10'± NOTES 1.CONSTRUCTION MATS SHOULD BE PLACED CLOSELY TOGETHER SO THERE ARE NO GAPS BETWEEN EACH MAT SECTION. 2.CONSTRUCTION MAT DIMENSIONS OF 12'x4'x8", 16'x4'x8" OR OTHER TO BE USED. 3.AIR BRIDGING MAY ALSO BE USED TO AVOID IMPACTS TO UNDERGROUND UTILITIES, STONE WALLS, RARE PLANTS OR OTHER SENSITIVE FEATURES. CONSULT WITH EVERSOURCE ENVIRONMENTAL. 4.ADDITIONAL MEASURES MAY BE REQUIRED.16'-0"CONSTRUCTION MATS A-6 CONSTRUCTION MAT (AIR BRIDGE) CONSTRUCTION MAT ANCHORING SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Construction Mat Anchor.dwgFeb 04, 2022-10:09am Plotted By: ASapelli12/2021 NO SCALE A07 HELICAL ANCHOR (TYP) POINTS OF ATTACHMENT (TYP) CABLE OR ROPE (TYP) PLAN VIEW NOTES: 1. TYPICAL HELICAL ANCHOR AND CABLE CONFIGURATION FOR MAT CONTAINMENT IN FLOODPLAINS/LAND SUBJECT TO FLOODING. 2. TYPICAL POINT OF ATTACHMENT HEAVY STAPLES, EYEBOLTS OR OTHER SUITABLE HARDWARE TO SECURE ATTACHMENT OF MAT TO LINEAR CABLE. IF CHAIN POCKETS ARE PRESENT IN THE MATS CABLE OR ROPE CAN BE LOOPED THROUGH RODS. A-6A-7 WETLAND AREA PLAN VIEW NOTES: 1. DRAINAGE LAYERS MAY BE USED AS AN ALTERNATIVE TO CULVERTS, OR IN COMBINATION WITH CULVERTS, TO PROVIDE ADEQUATE CROSS-DRAINAGE. 2. FILTER FABRIC "JOINTS" SHOULD OVERLAP AT LEAST 18" (WHERE ONE PIECE OF FILTER FABRIC ENDS AND A NEW PIECE OF FABRIC IS ADDED TO CONTINUE THE ROAD). 3. EROSION AND SEDIMENTATION CONTROLS MAY BE INSTALLED ADJACENT TO THE SIDES OF THE ROAD WHEN CONDITIONS WARRANT. PERMEABLE ROAD SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Permeable Road.dwgDec 15, 2021-3:26pm Plotted By: ASapelli12/2021 NO SCALE ELEVATION VIEW DRAINAGE LAYER OF 3"-6" ROCK (MINIMUM 12" THICK) OR LOG CORDUOY (MINIMUM 2" LOG DIAMETER) GRANULR FILL TOP GEOTEXTILE LAYER BOTTOM GEOTEXTILE LAYER MUDDY/UNSTABLE GROUND IN OR NEAR WETLAND AREA DIRECTION OF TRAFFIC A08 A-7A-8 TEMPORARY CONSTRUCTION CULVERT SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Culv_Cros_Temp.dwgDec 15, 2021-3:24pm Plotted By: ASapelli12/2021 NO SCALE FLOWFLOW PLAN VIEW ELEVATION VIEW NOTES: 1. CAPACITY OF PIPES COMBINED SHOULD ACCOUNT FOR SIGNIFICANT STORM EVENTS. 2. INSTALLATION OF NEW CULVERTS MAY REQUIRE PERMITS. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING PRIOR TO CONSTRUCTION. COARSE AGGREGATETOP OF BANK EARTHEN FILL COVERED WITH LARGE ANGULAR ROCKS DIVERSION BAR ROCK LAYER SHOULD BE HALF THE DIAMETER OF THE PIPE, 30CM, OR AS NEEDED TO SUPPORT LOADS - WHATEVER IS GREATER COARSE AGGREGATE EARTHEN FILL COVERED WITH LARGE ANGULAR ROCKS NON-WOVEN GEOTEXTILE FABRIC A09 A-8A-9 FLOWFLOW PLAN VIEW SECTION A-A NOTE: 1. INSTALLATION OF NEW OR REPLACEMENT STREAM CROSSINGS, INCLUDING BOX CULVERTS, IS SUBJECT TO ENVIRONMENTAL PERMITTING. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING. PERMANENT, OPEN BOTTOM BOX CULVERT CROSSING SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Box Culvert _Permanent.dwgDec 15, 2021-3:21pm Plotted By: ASapelli12/2021 NO SCALE OPEN BOTTOM BOX CULVERT TOP OF BANK ACCESS ROAD GRADE TOP OF BANK ACCESS ROAD ARCH BOX CULVERT TOP OF BANK EDGE OF WATER A A A10 A-9A-10 PERMANENT OPEN BOTTOM BOX CULVERT ARCH CULVERT SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Arch Culvert.dwgDec 15, 2021-3:21pm Plotted By: ASapelli12/2021 NO SCALE NOTES: 1. CHAMBERS SHALL CONFORM TO THE REQUIREMENTS OF ASTM F2418 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS", OR ASTM F2922 "STANDARD SPECIFICATION FOR POLYETHYLENE (PE) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 2. CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 34"16"6"24" MINACCESS ROAD 3 4" CRUSHED STONE GEOTEXTILE FABRIC FOR SEPARATION CORRUGATED ARCH SYSTEM UNDISTURBED STREAM BED ORDINARY BORROW A11 A-10A-11 POLE FORD SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Pole Ford.dwgDec 15, 2021-3:26pm Plotted By: ASapelli12/2021 NO SCALE A12 NOTES: 1. POLES AND NONWOVEN GEOTEXTILE MUST BE REMOVED IMMEDIATELY AFTER USE. 2. LENGTH OF POLES SHALL BE AT LEAST 10 FEET. 3. USE OF HARDWOODS PROHIBITED. 4. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING PRIOR TO INSTALLATION OF POLED FORDS. UNDISTURBED VEGETATION TOP OF BANK PLAN VIEW ELEVATION VIEW FLOW FLOW 10' MIN NONWOVEN GEOTEXTILE 8 TO 10-INCH POLES STREAM A-11A-12 LEGEND REPLACEMENT POLE LOCATION CONSTRUCTION MAT - 16'x4'x 8" TYPICAL SIZE. 12'x4'x8" OR OTHER SIZE ACCEPTABLE. WORK SPACE REQUIREMENTS - LIVE LINE WORK (DETERMINED BASED ON PROJECT SPECIFIC NEEDS) LIMIT OF RIGHT-OF-WAY WETLAND AREA CONSTRUCTION MAT LAYOUT (LIVE LINE WORK) WETLAND BOUNDARY 16' WIDE ACCESS 16'x4' CONSTRUCTION MATS WORK PAD SIZE TO BE DETERMINED BY PROJECT SPECIFIC NEEDS SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Construction Mat-Live Line Work.dwgDec 15, 2021-3:24pm Plotted By: ASapelli12/2021 NO SCALE WETLAND BOUNDARY A13 A-12A-13 LEGEND REPLACEMENT POLE LOCATION CONSTRUCTION MAT - 16'x4'x 8" TYPICAL SIZE. 12'x4'x8" OR OTHER SIZE ACCEPTABLE. WORK SPACE REQUIREMENTS - DE-ENERGIZED WORK (DETERMINED BASED ON PROJECT SPECIFIC NEEDS) LIMIT OF RIGHT-OF-WAY WETLAND AREA CONSTRUCTION MAT LAYOUT (DE-ENERGIZED LINE WORK) WETLAND BOUNDARY 16' WIDE ACCESS 16'x4' CONSTRUCTION MATS WORK PAD SIZE TO BE DETERMINED BY PROJECT SPECIFIC NEEDS SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Swamp Mat -Deenergized Work.dwgDec 15, 2021-3:28pm Plotted By: ASapelli12/2021 NO SCALE A14 A-13A-14 CONCRETE WASHOUT AREA SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Concrete Washout.dwgDec 15, 2021-3:23pm Plotted By: ASapelli12/2021 NO SCALE NOTES: 1. CONCRETE WASHOUT AREA(S) SHALL BE INSTALLED PRIOR TO CONCRETE PLACEMENT ON SITE. THE CONCRETE WASHOUT AREA SHALL BE ENTIRELY SELF-CONTAINED. 2. THE CONTRACTOR SHALL SUBMIT THE DESIGN, LOCATION AND SIZING OF THE CONCRETE WASHOUT AREA(S) WITH THE PROJECTS'S EROSION AND SEDIMENTATION CONTROL PLAN. 3. LOCATION: WASHOUT AREA(S) ARE TO BE LOCATED AT LEAST 50 FEET FROM ANY STREAM, WETLAND, STORM DRAINS, OR OTHER SENSITIVE RESOURCE. THE FLOOD CONTINGENCY PLAN MUST ADDRESS THE CONCRETE WASHOUT IF THE WASHOUT IS TO BE LOCATED WITHIN THE FLOODPLAIN. SIZE: THE WASHOUT MUST HAVE SUFFICIENT VOLUME TO CONTAIN ALL LIQUID AND CONCRETE WASTE GENERATED BY WASHOUT OPERATIONS INCLUDING, BUT NOT LIMITED TO, OPERATIONS ASSOCIATED WITH GROUT AND MORTAR. 4. SURFACE DISCHARGE IS UNACCEPTABLE. THEREFORE, STRAW BALES OR OTHER CONTROL MEASURES, SHOULD BE USED AROUND THE PERIMETER OF THE CONCRETE WASHOUT AREA FOR CONTAINMENT. 5. SIGNS SHOULD BE PLACED AT THE CONSTRUCTION ENTRANCE, AT THE CONCRETE AREA(S) AND ELSEWHERE AS NECESSARY TO CLEARLY INDICATE THE LOCATION OF THE CONCRETE WASHOUT TO OPERATORS OF CONCRETE TRUCKS AND PUMP RIGS. WASHOUT AREA(S) SHOULD BE FLAGGED WITH SAFETY FENCING OR OTHER APPROVED METHOD. 6. WASHOUT AREA(S) ARE TO BE INSPECTED AT LEAST ONCE A WEEK FOR STRUCTURAL INTEGRITY, ADEQUATE HOLDING CAPACITY AND CHECKED FOR LEAKS, TEARS OR OVERFLOWS. (AS REQUIRED BY THE CONSTRUCTION SITE ENVIRONMENTAL INSPECTION REPORT) WASHOUT AREA(S) SHOULD BE CHECKED AFTER HEAVY RAINS. 7. HARDENED CONCRETE WASTE SHOULD BE REMOVED AND DISPOSED OF WHEN THE WASTE HAS ACCUMULATED TO HALF OF THE CONCRETE WASHOUT'S HEIGHT. THE WASTE CAN BE STORED AT AN UPLAND LOCATION. ALL CONCRETE WASTE SHALL BE DISPOSED OF IN A MANNER CONSISTENT WITH ALL APPLICABLE LAWS, REGULATIONS, AND GUIDELINES. STRAW BALES OR COMPACTED EARTH BERM (SEE NOTE 3) VARIES SEE NOTE 2 SIDE SLOPES (SEE BELOW) DEPTH VARIES SEE NOTE 2 10 MIL POLYETHYLENE SHEETING SAND BAGS TO SECURE SHEETING (OR METHOD AS DIRECTED BY ENGINEER) SIDE SLOPES TO BE 2:1 OR 3:1 (NOMINAL) A15 A-14A-15 CONCRETE WASH OUT ROAD TRENCH (DUCT BANK) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Road Treanch - 6-Way Ductbank.dwgDec 15, 2021-3:26pm Plotted By: ASapelli12/2021 NO SCALE30" MIN.FINISHED GRADE EQUALDUCTBANK MARKING TAPE (TYP) #4 REBAR (TYP) 112" MIN (TYP)" 3" MIN SEPARATION (TYP)EQUAL#4 REBAR (TYP) 18" OC 3" MIN (TYP) 3" MIN (TYP) BASE AND INTERMEDIATE SPACERS 48" OC EBR PVC (TYP) 4500 psi CONCRETE NOTES: 1. GEOTECH TEST, IN ACCORD WITH ASTM D608, THE BOTTOM OF EXCAVATION TO ACHIEVE 85% OF MAXIMUM DRY DENSITY, PRIOR TO CONCRETE PLACEMENT. A16 A-15A-16 ROAD TRENCH - DUCT BANK SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Road Treanch - Duct Bank.dwgDec 15, 2021-3:27pm Plotted By: ASapelli12/2021 NO SCALE A17 A-16A-17 ROAD TRENCH (6-WAY DUCT BANK) TREE PROTECTION SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Tree Prot.dwgDec 15, 2021-3:29pm Plotted By: ASapelli12/2021 NO SCALE PROTECTED ROOT ZONE NO STORAGE OF EQUIPMENT OR STOCKPILING OF MATERIALS WITHIN DRIPLINE EXISTING GRADE 2"X4" DIMENSIONAL LUMBER ATTACHED WITH METAL STRAPPING (OPTIONAL) AT TWO LOCATIONS (MINIMUM), DO NOT DAMAGE BARK, 6" SPACING OF BOARDS, CUT BOARDS TO FIT EXISTING ROOT SYSTEM (APPROXIMATE) PRUNE PER ISA STANDARDS REMOVE DEAD WOOD AND DAMAGED BRANCHES TIE UP BRANCHES IF RISK OF DAMAGE FROM CONSTRUCTION EQUIPMENT PRUNE ANY ROOTS EXPOSED AND/OR DAMAGED BY EXCAVATION WITH A SHARP SAW A18 A-17A-18 SOIL STOCKPILE MANAGEMENT SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Soil_Stpl_Mgmt.dwgDec 15, 2021-3:27pm Plotted By: ASapelli12/2021 NO SCALE ELEVATION VIEW PLAN VIEW STRAW BALES AND/OR SILT FENCE CONTAMINATED SOILS MUST BE ON AND COVERED WITH POLYETHYLENE SHEETING TO LIMIT EROSION. SHEETING NOT REQUIRED FOR NON-CONTAMINATED SOILS IF SEDIMENTATION AND EROSION CONTROLS COMPLETELY ENCLOSE STOCKPILE. STRAW BALES AND/OR SILT FENCE CONTAMINATED SOILS MUST BE ON AND COVERED WITH POLYETHYLENE SHEETING TO LIMIT EROSION. SHEETING NOT REQUIRED FOR NON-CONTAMINATED SOILS IF SEDIMENTATION AND EROSION CONTROLS COMPLETELY ENCLOSE STOCKPILE. SOIL SANDBAGS AS REQUIRED TO SECURE SHEETING POLYETHELENE SHEETING SANDBAG EACH BALE IN PAVED AREAS (TYP) BALES TO BUTT TOGETHER AA NOTE: 1. SANDBAGS (OR SIMILAR) MAY BE USED TO SECURE POLYETHYLENE SHEETING ON TOP OF THE STOCKPILE. 2. STRAW PRODUCTS ONLY; THE USE OF HAY OR HAY PRODUCTS IS STRICTLY PROHIBITED. SECTION A-A 2 STAKES EACH BALE IN UNPAVED AREAS (TYP) SOIL STOCKPILE STRAW BALE A19 A-18A-19 TOPSOIL SEGREGATION SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Topsoil.dwgDec 15, 2021-3:29pm Plotted By: ASapelli12/2021 NO SCALE NOTES: 1. TOPSOIL SEGREGATION TO BE USED IN WETLANDS AND AGRICULTURAL LAND. 2. IF WORKING WITHIN WETLANDS, MATTING BENEATH STOCKPILES MUST BE LINED OR UNDERLAIN BY GEOTEXTILE FABRIC. 3. STOCKPILES SHOULD BE ENCLOSED BY STRAW BALES OR WATTLES. WETLAND TRENCH TIMBER MAT STRAW BALE OR WATTLE A20 A-19A-20 STRAW BALE BARRIER SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Straw Bales.dwgDec 15, 2021-3:28pm Plotted By: ASapelli12/2021 NO SCALE DETAIL B RUNOFF SECTION A-A WORK ZONE PLAN FLOWWORK ZONE FLOWDETAIL A A A 6" MIN. FABRIC 6" MIN.FABRIC2"(TYP)18"4'-6"2"x2" WOOD STAKES SPACED AT 4'-5'± OC SILT FENCE GRADE SEE DETAIL B SILT FENCE SUITABLE BACKFILL SILT FENCE WOOD POSTS @4'-5'± O.C. FINISHED GRADE BUTT BALES TOGETHER SILT FENCE SEE DETAIL A (2) 2"x2"x3' STAKES AT EACH BALE EXISTING GROUND (2) 2"x2"x3' STAKES AT EACH BALE NOTE: USE OF HAY AND/OR PRODUCTS CONTAINING WEED SEED IS PROHIBITED. A21 A-20A-21 SILT FENCE SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Silt Fence.dwgDec 15, 2021-3:27pm Plotted By: ASapelli12/2021 NO SCALE 6" MIN.FABRIC6" MIN. FABRIC A A 18"4'-6"DETAIL AFLOWWORK ZONE FLOWPLAN WORK ZONE SECTION A-A RUNOFF DETAIL B SILT FENCE SEE DETAIL A 2"x2" WOOD STAKES SPACED AT 4'-5'± O.C. SILT FENCE GRADE SEE DETAIL B EXISTING GROUND SILT FENCE SUITABLE BACKFILL FINISHED GRADE A22 A-21A-22 SYNCOPATED SILT FENCE SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Syncopated Silt Fence.dwgDec 15, 2021-3:29pm Plotted By: ASapelli12/2021 NO SCALE SECTION A-A DETAIL A DETAIL B PLAN A A WORK ZONE WORK ZONE EXISTING GROUND 4'-6"18"FLOWFLOW2' GAP 2"X2" WOOD STAKES SPACED @ 4'-5'± O.C. FINISHED GRADE SILT FENCE SILT FENCE RUNOFF SEE DETAIL B SUITABLE BACKFILL 6" MIN. FABRIC 6" MIN. FABRIC 50' LENGTH SILT FENCE50' LENGTH SILT FENCE 20' LENGTH SILT FENCE 1'GAPA23 A-22A-23 REINFORCED SILT FENCE SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Silt Fence-Wire.dwgDec 15, 2021-3:27pm Plotted By: ASapelli12/2021 NO SCALE24"SECTION ELEVATION RUNOFF FILTRATION GEOTEXTILE GRADE A24 24" MAX18" MIN6'-0" MAX WITH WIRE TOP AND BOTTOM STRAND SHALL BE 10 GAUGE MIN. WIRE FILTRATION GEOTEXTILE MIDDLE AND VERTICAL WIRES SHALL BE 1212" GAUGE MIN. 4"8"STEEL POST COMPACTED FILL NOTES: 1. USE FILTRATION GEOTEXTILE A MINIMUM OF 36" IN WIDTH AND FASTEN ADEQUATELY TO THE POSTS AND WIRES AS DIRECTED. 2. USE A WIRE A MINIMUM OF 32" IN WIDTH AND WITH A MINIMUM OF 6 LINE WIRES WITH 12" STAY SPACING. 3. PROVIDE 5'-0" STEEL POST OF THE SELF-FASTENER ANGLE STEEL TYPE. 4. FOR MECHANICAL SLICING METHOD INSTALLATION, GEOTEXTILE SHALL BE A MAXIMUM OF 18" ABOVE GROUND SURFACE. 5. EXTEND GEOTEXTILE AND WIRE INTO TRENCH. A-23A-24 NOTES: 1. EROSION CONTROL BLANKET SHOULD BE INSTALLED VERTICALLY DOWNSLOPE. 2. STAKES/STAPLES SHOULD BE PLACED NO MORE THAN 3 FT. APART VERTICALLY, AND 1 FT. APART HORIZONTALLY. 3. SLOPE SURFACE SHOULD BE FREE OF STICKS, ROCKS, AND OTHER OBSTRUCTIONS. 4. BLANKETS SHOULD BE ROLLED OUT LOOSELY AND STAKED/STAPLED TO MAINTAIN DIRECT SOIL CONTACT. DO NOT STRETCH THE BLANKETS. 5. USE OF PRODUCTS WITH PLASTIC AND/OR NYLON NETTING IS PROHIBITED. MAXI MU M SLOPE=30 %6"4' ≤ 1 ' 2 - 3 " EROSION CONTROL BLANKET SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\E-Blanket.dwgDec 15, 2021-3:25pm Plotted By: ASapelli12/2021 NO SCALE SOIL SHOULD BE TAMPED DOWN OVER BLANKET STAKE/STAPLE (TYP) STAKE/STAPLE ≤ 3' A25 A-24A-25 EROSION CONTROL BLANKETS STRAW WATTLE/MULCH LOG SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Straw Wattle2.dwgDec 15, 2021-3:28pm Plotted By: ASapelli12/2021 NO SCALE PLAN SECTION WORK ZONE FLOW WORK ZONE STAKE EVERY 10'± STRAW WATTLES OR MULCH LOGS WOODEN STAKE 3"-4"12"NOTE: 1. USE OF PRODUCTS WITH PLASTIC AND/OR NYLON NETTING IS PROHIBITED. AREA TO BE PROTECTED AREA TO BE PROTECTED A26 A-26 STRAW WATTLE (ON SLOPE) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Straw Wattle.dwgDec 15, 2021-3:28pm Plotted By: ASapelli12/2021 NO SCALE ELEVATION VIEW SHALLOW DITCH PREPARED FOR STRAW WATTLE INSTALLATION STRAW WATTLE WOODEN STAKE FOOT TAMPED BACKFILL ON UPSLOPE SIDE 1. USE OF PRODUCTS WITH PLASTIC AND/OR NYLON NETTING IS PROHIBITED. 2. VERTICAL SPACING FOR SLOPE INSTALLATIONS TO BE DETERMINED BY SITE CONDITIONS: SLOPE GRADIENT AND SOIL TYPE. CONFIRM SPACING PER MANUFACTURER'S SPECIFICATIONS. SEE BELOW FOR TYPICAL REQUIREMENTS. COORDINATE SPACING AND LOCATION WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING. ·1:1 SLOPES = 10 FEET APART ·2:1 SLOPES = 20 FEET APART ·3:1 SLOPES = 30 FEET APART 3. MINIMUM 12" DIAMETER WATTLES SHOULD BE USED FOR HIGHLY DISTURBED AREAS (E.G. HEAVILY USED ACCESS ROADS WITH ADJACENT WETLANDS). MINIMUM 8" DIAMETER WATTLES SHOULD BE USED FOR LESS DISTURBED SOILS. NOTES: STRAW WATTLE WOODEN STAKE A2 A-26A-27 A27 COMPOST FILTER TUBE SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Compost Filter Tube.dwgDec 15, 2021-3:22pm Plotted By: ASapelli12/2021 NO SCALE PLAN SECTION WORK ZONE FLOW WORK ZONE STAKE EVERY 10'± COMPOST FILTER TUBE 1"x1" WOODEN STAKE 3"-4"12"NOTES: 1. TUBES FOR COMPOST FILTERS SHALL BE JUTE MESH OR APPROVED BIODEGRADABLE MATERIAL. 2. TAMP TUBES IN PLACE TO ENSURE GOOD CONTACT WITH SOIL SURFACE. 3. PROVIDE 3' MINIMUM OVERLAP AT ENDS OF TUBES TO JOIN IN A CONTINUOUS BARRIER AND MINIMIZE UNIMPEDED FLOW. 4. COMPOST MATERIAL SHALL BE DISPERSED ON SITE WITHIN LIMITS OF WORK, AS DIRECTED. 5. INSTALL TUBES ALONG CONTOURS AND PERPENDICULAR TO SHEET OR CONCENTRATED FLOW. 6. DO NOT INSTALL IN PERENNIAL, EPHEMERAL, OR INTERMITTENT STREAMS. 7. CONFIGURE TUBES AROUND EXISTING SITE FEATURES TO MINIMIZE SITE DISTURBANCE AND MAXIMIZE CAPTURE AREA OF STORMWATER RUN-OFF. COMPOST FILTER TUBE 12"-18" DIA. (TYP)AREA TO BE PROTECTED AREA TO BE PROTECTED A28 A-27A-28 TURBIDITY CURTAIN SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Turbidity Curtain.dwgDec 15, 2021-3:29pm Plotted By: ASapelli12/2021 NO SCALE A A BAFFLE ELEVATION DIELECTRIC SEAM BOTTOM HEM 1 4" Ø HDG STEEL PROOF-COIL CHAIN 516" Ø ANCHOR CONNECT QUICK-LINK 3 8" Ø POLYPROPYLENE ANCHOR LIFTING LINE DIELECTRIC SEAM BAFFLE SKIRT 8OZ. NONWOVEN GEOTEXTILE UNICELLULAR POLYSTYRENE FOAM FLOATATION 20' TYP VERIFY IN FIELD 10' TYP VERIFY IN FIELD6"ØNOTES: 1. TURBIDITY CURTAIN BY ENVIRONETICS, INC. OR APPROVED EQUAL. 2. TURBIDITY CURTAIN SHALL NOT BE EXTENDED ACROSS CHANNEL FLOWS. 3. TURBIDITY CURTAIN MATERIAL SHALL BE ULTRAVIOLET LIGHT RESISTANT. TYPE I II III IV DESCRIPTION FLATWATER LIGHTWEIGHT MIDDLEWEIGHT HEAVYWEIGHT CONDITIONS CALM AND PROTECTED SEMI-PROTECTED AREA, CURRENTS UP TO 2 FT/S EXPOSED AREA, CURRENTS UP TO 5 FT/S EXPOSED TO WIND, CURRENT, AND TIDES GAP (IN.) 0 12 12 0 GAP, SEE TABLE SECTION A-A A29 A-28A-29 CATCH BASIN INLET PROTECTION (STRAW BALES) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\CB Inlet Prot.dwgDec 15, 2021-3:21pm Plotted By: ASapelli12/2021 NO SCALE GUTTER LINE GUTTER LINE PLAN ELEVATION NOTES: 1. A MINIMUM OF TWO WOOD STAKES ARE REQUIRED PER STRAW BALE. 2. STEEL DOWELS MAY BE USED WHERE WOOD STAKES CANNOT BE DRIVEN INTO THE GROUND. 3. "SILT SACKS", "DANDY BAG II" OR OTHER SIMILAR SILT RETENTION DEVICES SHALL BE INSTALLED IN LIEU OF STRAW BALES FOR CATCH BASINS LOCATED IN EXISTING PAVED AREAS. 4. STRAW PRODUCTS ONLY; THE USE OF HAY OR HAY PRODUCTS IS STRICTLY PROHIBITED. 2" X 2" X 3' STAKES OR STEEL DOWELS (TYP) 2" X 2" X 3' STAKES OR STEEL DOWELS (TYP) STRAW BALE CATCH BASIN FRAME AND COVER EXISTING GRADE A30 A-29A-30 CATCH BASIN INLET PROTECTION (SILT SACK) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Silt Sack.dwgDec 15, 2021-3:27pm Plotted By: ASapelli12/2021 NO SCALE PLAN VIEW NOTES: 1. FILTER BASKET SHALL BE "SILT SAK" BY JENNIAN, MELROSE, MA; "DANDY BAG" BY DANDY PRODUCTS (1-800-591-2284); DRAIN PAC (91-800-272-2832); OR APPROVED EQUIVALENT SUBJECT TO CONSULTATION WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING. 2. FILTER BASKETS SHOULD BE USED IN COMBINATION WITH ANOTHER INLET PROTECTION MEASURE SUCH AS SEDIMENT FILTER FABRIC IF DRAINAGE AREA IS SMALL WITH SHALLOW FLOWS. ELEVATION VIEW FINISH GRADE GUTTER LINEGUTTER LINE SEDIMENT FILTER FABRICCATCH BASIN FRAME & COVER FILTER BASKET SEDIMENT FILTER FABRIC A31 A-30A-31 LOAM AND SEED SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Loam and Seed.dwgDec 15, 2021-3:26pm Plotted By: ASapelli12/2021 NO SCALE SEED MIX FOR LAWNS: TALL FESCUE - 70% KENTUCKY BLUEGRASS - 10% PERENNIAL RYEGRASS - 20% APPLY AT 2LBS PER 1000 S.F. FINISH GRADE 3" MINIMUM TOPSOIL SUB-GRADE NOTE: THE SEED MIX UTILIZED SHALL CONSIST OF QUICK GROWING, DROUGHT TOLERANT, NATIVE GRASSES, SUCH AS RYES. THE SEED MIX UTILIZED WITHIN THE BUFFER ZONE TO WETLAND RESOURCE AREAS MAY CONSIST OF QUICK GROWING, DROUGHT TOLERANT, NATIVE GRASSES BUT MUST CONTAIN AT LEAST 50% OF A NATIVE SEED MIX WITH HIGH HABITAT VALUE, SUCH AS ONES WHICH CONTAIN PERENNIAL SHRUBS, WILDFLOWERS. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING FOR PROJECT SPECIFIC REQUIREMENTS. A32 A-31A-32 STRAW MULCH SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Straw Mulch.dwgDec 15, 2021-3:28pm Plotted By: ASapelli12/2021 NO SCALE STRAW MULCH: 1" THICK MAX UNSTABLE SOILS NOTES: 1. STRAW PRODUCTS ONLY; THE USE OF HAY OR HAY PRODUCTS IS STRICTLY PROHIBITED. 2. MULCH APPLICATION SHALL NOT EXCEED 1" IN THICKNESS. 3. WOOD CHIPS MAY BE SUBSTITUTED FOR STRAW MULCH SUBJECT TO EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING APPROVAL. 4. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING FOR PROJECT SPECIFIC REQUIREMENTS. A33 PLAN VIEW ELEVATION VIEW LIMIT OF SOIL DISTURBANCESTRAW MULCH A-32A-33 COIR LOG SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Coir log.dwgDec 15, 2021-3:22pm Plotted By: ASapelli12/2021 NO SCALE STREAM BED COIR LOG AND EROSION CONTROL SEED MIX TOP OF BANK/OHW WOODEN STAKES (2 FT. LONG) NORMAL WATER LEVEL NOTES: 1. USE OF PRODUCTS WITH PLASTIC AND/OR NYLON NETTING IS PROHIBITED. 2. INSTALL PER MANUFACTURER'S RECOMMENDATIONS. 3. INSTALLATION MAY INCLUDE SEEDING AND/OR OTHER NATIVE PLANT INSTALLATION. CONSULT EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING. TYPICAL STAKING UPLAND 3' 3' A34 A-33A-34 LEVEL SPREADER SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Level Spreader.dwgDec 15, 2021-3:26pm Plotted By: ASapelli12/2021 NO SCALE SECTION A-A PLAN VIEW 3 1 3 1 4' WIDTH 12" MIN. NOTE: WHERE GROUND DOWNSTREAM OF LEVEL SPREADER HAS BEEN DISTURBED, VEGETATIVE COVER SHALL BE ESTABLISHED. FILTER FABRIC 3/4" CRUSHED STONE 2" CRUSHED STONE EXISTING GROUND 4" LOAM AND SEED COVER CREST WITH EROSION CONTROL BLANKET LEVEL SPREADER LEVEL SPREADER MEET EXISTING GRADE4'A A A35 A-34A-35 CHECK DAMS SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Check Dams.dwgDec 15, 2021-3:22pm Plotted By: ASapelli12/2021 NO SCALE A36 SWALE ELEVATION VIEW STRAW BALE CHECK DAM ACCESS ROAD SURFACE STABLE UPLANDS ACCESS ROAD PLAN VIEW CHECK DAM (SEE BELOW)SWALE EROSION CONTROL BLANKETS (OPTIONAL) STRAW BALE CHECK DAM SWALE ELEVATION VIEW STONE CHECK DAM ACCESS ROAD SURFACE EROSION CONTROL BLANKETS (OPTIONAL) STONE CHECK DAM NOTES: 1. CHECK DAMS SHALL BE CONSTRUCTED OF STONE OR STRAW PRODUCTS ONLY; THE USE OF HAY OR HAY PRODUCTS IS STRICTLY PROHIBITED. 2. HEIGHT AND SPACING OF CHECK DAMS IS DEPENDENT ON SLOPES AND RUNOFF CONDITIONS. CONSULT WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING PRIOR TO INSTALLATION FOR PROJECT SPECIFIC REQUIREMENTS. 3. REMOVE TEMPORARY CHECK DAMS UPON SWALE STABILIZATION AND/OR COMPLETION OF CONSTRUCTION. A-35A-36 TRENCH BREAKER SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Trench Breaker.dwgDec 15, 2021-3:29pm Plotted By: ASapelli12/2021 NO SCALE BOTTOM OF DITCH SECTION ELEVATION GRADED RIGHT-OF-WAY GRADED RIGHT-OF-WAY SANDBAGS COMPACTED FILL PIPELINE CROSS-COUNTRY BURIED PIPELINE BOTTOM OF DITCH SECTION ELEVATION EXISTING ROAD EXISTING ROAD SANDBAGS COMPACTED FILL PIPELINE IN-ROAD BURIED PIPELINE A37 A-36A-37 SEDIMENT TRAP SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\E-Sediment Trap.dwgDec 15, 2021-3:25pm Plotted By: ASapelli12/2021 NO SCALE GROUND SLOPE 2' HIGH CLEAN STONES (d =6") GROUND SLOPE STRAW BALE SECTION A-A AA 2' 15'-20' (TYP) OR AS DIRECTED SEDIMENT FREE WATER 10'-15' (TYP) OR AS DIRECTED 50 PUMP DISCHARGE LINE FILTER BAG FLAT STONE FILTER FABRIC MAT SEDIMENT STRAW BALE FILTER FABRIC MAT PUMP DISCHARGE SEDIMENT LADEN WATER FILTER BAG. CAPACITY OF FILTER BAG SHALL BE ADEQUATE TO HANDLE DEWATERING PUMP DISCHARGE. TO NATURAL WATER COURSE NOTES: 1. LOCATION OF SEDIMENT TRAP SUBJECT TO CONSULTATION WITH EVERSOURCE ENVIRONMENTAL LICENSING AND PERMITTING. 2. SEDIMENT TRAPS OR SETTLING BASINS SHALL BE USED FOR CONSTRUCTION DEWATERING. 3. DISCHARGE AWAY FROM WORK AREA/DEWATERING AREA. A38 A-37A-38 DEWATERING BASIN SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Dewat_Basin1.dwgDec 15, 2021-3:24pm Plotted By: ASapelli12/2021 NO SCALE PERSPECTIVE PLAN VIEW SECTION FILTER FABRIC MAT LINING ON BOTTOM AND SIDES PUMP DISCHARGE HOSE STRAW BALES EMBEDDED 4" AND STAKED AS REQUIRED PUMP DISCHARGE HOSE STRAW BALES EMBEDDED 4" AND STAKED AS REQUIRED PUMP DISCHARGE HOSE STRAW BALES EMBEDDED 4" AND STAKED AS REQUIRED SET 2 STRAW BALES 2" BELOW ADJOINING FILTER FABRIC MAT LINING ON BOTTOM AND SIDES NOTE: PLACE DEWATERING/PUMPING SETTLING BASINS IN A WELL-VEGETATED AREA, OUTSIDE OF WETLANDS WHENEVER PRACTICABLE. A39 A-38A-39 DEWATERING FILTER BAG SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Dewat_Basin2.dwgDec 15, 2021-3:24pm Plotted By: ASapelli12/2021 NO SCALE PERSPECTIVE HOSE INLET STRAW BALES SECTION PLAN DISCHARGE HOSE ONE PER FILTER BAG HOSE CLAMP FILTER BAG SET ON FILTER FABRIC 15'STAKES MAXFILTER BAG FILTER BAG NOTE: PLACE FILTER BASINS IN A WELL-VEGETATED AREA, OUTSIDE OF WETLANDS WHENEVER PRACTICABLE.16'4'2 STAKES PER BALE (TYP ALL BALES) A40 A-39A-40 DEWATERING BASIN (FILTER BAG) DEWATERING (FRAC TANK) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Frac Tank.dwgDec 15, 2021-3:25pm Plotted By: ASapelli12/2021 NO SCALE CONTINGENCY TREATMENT FOR REGULATED GROUNDWATER PROCESS A41 A-40A-41 DEWATERING BASIN (FRAC TANK) COFFER DAM AND STREAM FLOW BYPASS (GRAVITY) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Coffer Dam Gravity.dwgDec 15, 2021-3:22pm Plotted By: ASapelli12/2021 NO SCALE FLOW FLOW DRY WORK AREA PLAN VIEW - GRAVITY COFFER DAM BYPASS HOSE TEMPORARY COFFER DAM (SANDBAGS OR SIMILAR) A42 A-42 COFFER DAM AND STREAM FLOW BYPASS (PUMPING) SCALE: DATE: FIGURE:Tighe & Bond, Inc. F:\Projects\E\E5034 Eversource L&P 2019\088 - CT-MA BMP Manual\Drawings_Figures\AutoCAD\Sheet\Coffer Dam.dwgDec 15, 2021-3:22pm Plotted By: ASapelli12/2021 NO SCALE FLOW FLOW DRY WORK AREA PLAN VIEW - PUMP COFFER DAM DISCHARGE HOSE PUMP TEMPORARY COFFER DAM (SANDBAGS OR SIMILAR) TEMPORARY SPLASH PAD TO SLOW VELOCITY A43 A-41A-43 APPENDIX B Table of Contents B-i APPENDIX B Appendix B B.1 Applicable Laws/Regulations ............................................................B- 1 B.2 Geographic Areas Subject to Jurisdiction ...........................................B- 1 B.3 Applicable Regulatory Agencies ........................................................B- 2 B.4 Maintenance, Repair, or Emergency Projects .....................................B- 3 B.4.1 Maintain, Repair and/or Replace .............................................B- 3 B.4.2 Emergency Projects ..............................................................B- 3 B.5 Municipal Permitting .......................................................................B- 4 B.6 CT Department of Energy & Environmental Protection .........................B- 4 B.7 U.S. Army Corps of Engineers ..........................................................B- 5 B.8 Culvert Installation .........................................................................B- 8 B.8.1 Municipal Permitting .............................................................B- 8 B.8.2 CT Department of Energy & Environmental Protection ...............B- 9 B.8.3 U.S. Army Corps of Engineers ................................................B- 9 Tighe&Bond Eversource Best Management Practices Manual –January 2022 B-1 Appendix B B.1 Applicable Laws/Regulations In Connecticut, there are no fewer than eight potentially pertinent regulatory programs associated with activities proposed in environmentally sensitive areas. The fol lowing list of laws and regulations are most likely to apply to electrical utility projects in the State. • Connecticut Inland Wetlands and Watercourses Act (C.G.S. §§ 22a-36 through 22a- 45a) • Municipal inland wetland and zoning regulations • Connecticut General Permit for Water Resource Construction Activities (C.G.S. §§ 22a-6, 22a-45a and 22a-378a) • Connecticut Environmental Policy Act (C.G.S. §§ 22a-1a through 22a-1h) • Connecticut Coastal Management Act (C.G.S. §§ 22a-359 through 22a-363; 22a-28 through 22a-35; 22a-90 through 22a-112; 33 U.S.C. § 1314) • Connecticut Water Diversion Policy Act (C.G.S. §§ 22a-365 through 22a-379) • Connecticut Endangered Species Act (C.G.S. §§ 26-303 through 26-315) • Section 10 of the Rivers and Harbors Act of 1899 (C.G.S. §§ 22a-426; 33 U.S.C. § 403) • Section 401 of the Clean Water Act (33 U.S.C. § 1251) • Section 404 of the Clean Water Act (33 U.S.C. § 1344) B.2 Geographic Areas Subject to Jurisdiction The following areas are subject to regulatory jurisdiction by at least one of the regulatory programs discussed in this section: It is important to note that more than one jurisdictional resource type may be present at any given location. • Inland wetlands, watercourses (rivers, streams, lake s, ponds), and floodplains • Areas subject to municipal wetlands bylaws or ordinances (these vary by town) • Coastal Resource Areas (beaches, dunes, bluffs, escarpments, coastal hazard areas, coastal waters, nearshore waters, offshore waters, estuarine embayments, developed shorefront, intertidal flats, islands, rocky shorefronts, shellfish concentration areas, shorelands, and tidal wetlands) • Navigable waters • Essential Fish Habitat (EFH) • Rare species habitat as mapped by the Connecticut Natural Diversity Database (NDDB) • Historic/cultural Resources including archaeological resources and above -ground historic resources Eversource Best Management Practices Manual –January 2022 Appendix B B-2 B.3 Applicable Regulatory Agencies Activities subject to jurisdiction under the above-referenced programs will generally be subject to review by one or more regulatory agencies (refer to list below). Most stream and wetland crossings will require notification or consultation with municipal Inland Wetland and Watercourses Agencies, and may require permitting with the U.S. Army Corps of Engineers (ACOE) and Connecticut Department of Energy & Environmental Protection (CT DEEP) u nder Sections 404 and 401 of the Clean Water Act. Coordination with CT DEEP may also be required for projects located within areas mapped by the Connecticut Natural Diversity Database. • Municipal Conservation Commissions • Connecticut Department of Energy & Environmental Protection (CT DEEP) Land and Water Resources Division (LWRD) • CT DEEP Wildlife Division • CT DEEP Office of Environmental Review • United States Army Corps of Engineers (ACOE) New England District • CT State Historic Preservation Office (CT SHPO) The State of Connecticut and the Federal Government define wetlands differently. According to the Inland Wetlands and Watercourses Act, inland wetlands are defined as “land, including submerged land, not regulated pursuant to Sections 22a-28 through 22a- 35 of the Connecticut General Statutes, as amended, which consists of any of the soil types designated as poorly drained, very poorly drained, alluvial, and floodplain by the National Cooperative Soil Survey, as it may be amended from time to time by the United States Department of Agriculture Natural Resource Conservation Service. Such areas may include filled, graded, or excavated sites which possess an aquic (saturated) soil moisture regime as defined by the National Cooperative Soil Survey.” State wetland identification is based solely on the presence of these soil types. “Watercourses" means rivers, streams, brooks, waterways, lakes, ponds, marshes, swamps, bogs and all other bodies of water, natural or artificial, vernal or intermittent, public or private, which are contained within, flow through or border upon this state or any portion thereof. Intermittent watercourses shall be delineated by a defined permanent channel and bank and the occurrence of two or more of the following characteristics: (A) Evidence of scour or deposits of recent alluvium or detritus, (B) the presence of standing or flowing water for a duration longer than a particular storm incident, and (C) the presence of hydrophytic vegetation. The Federal Government defines wetlands as “Those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetatio n typically adapted for life in saturated soil conditions.” Federal wetland identification is based on a three- parameter approach, where a prevalence of hydrophytic vegetation, hydric soils, and wetland hydrology is used to make a wetland determination. Eversource Best Management Practices Manual –January 2022 Appendix B B-3 B.4 Maintenance, Repair, or Emergency Projects Most regulatory programs contain provisions that allow normal maintenance of existing structures and/or response to emergency situations that require immediate attention. Prior to commencement of new construction, all jurisdictional wetland areas within the work corridor should be delineated by a qualified wetland and soil scientist. The specialist shall delineate areas in accordance with the General Statutes of Connecticut (revised January 1, 2007) as set forth at Title 22a Chapter 440 “Inland Wetlands and Watercourses Act”, the U.S. Army Corps of Engineers 1987 Wetland Delineation Manual, and any local inland wetland regulations, ordinances or bylaws that may ex ist. Refer to each set of regulations regarding applicable wetland definitions. Wetland areas shall be clearly demarcated using appropriate flagging tape or similar means. It is important to note that certain jurisdictional wetland areas in Connecticut can actually occur in uplands, such as floodplains. In addition, Upland Review Areas generally apply to work activities and vary in each community. This makes consultation with a wetland specialist particularly important. B.4.1 Maintain, Repair and/or Replace Exemptions or considerations for maintenance, repair, and/or replacement of existing electrical utility structures exist in some environmental regulations, but not all. The exemptions are limited to work related to existing and lawfully located structures where no change in the original structure or footprint is proposed. It is not for the selected contractor of a particular project to make a determination as to whether an activity is exempt. This determination will be made prior to work by the Eversource project manager, in consultation with Eversource environmental staff. These exemptions/considerations are afforded at: • CT Inland Wetlands & Watercourses Act (RCSA § 22a-39-4) • CT General Permit (Section 3) • CT Coastal Management Act (RCSA § 22a-363b) • CT GP [33 CFR 323.4(a)(2)] • CT Water Diversion Policy Act (RCSA § 22a-377(b)1) B.4.2 Emergency Projects Emergency provisions are generally afforded to activities that need to abate conditions that pose a threat to public health or safety. These provisions generally do not allow work beyond what is necessary to abate the emergency condition and will generally require an after-the-fact permit. It is not for the selected contractor of a particular project to make a determination as to whether an activity is an emergency. This determination will be made prior to work by the Eversource project manager, in consulta tion with Eversource Environmental Licensing and Permitting. It is important to note that invocation of an emergency provision does not release the project proponent from reporting requirements. Emergency provisions are afforded at: • CEPA (RCSA § 22a-1a-3) • CT Coastal Management Act (RCSA § 22a-29) • CT GP [33 CFR Part 323.4(a)(2)] Eversource Best Management Practices Manual –January 2022 Appendix B B-4 B.5 Municipal Permitting Work within wetlands, watercourses and designated Upland Review Areas typically requires notification to municipal staff, (Department of Public Works and/or the Inland Wetland and Watercourse Agency staff). In October 1996 the Connecticut Department of Public Utility Control opened a docket (Docket Number 95 -08-34) to conduct a generic investigation on the allocation of siting jurisdiction over utility plant facil ities. This included an investigation as to whether local authorities (including local Inland Wetlands and Watercourses Agencies) have jurisdiction over public utility projects. The investigation resulted in several orders which provide guidance on how pub lic utility companies should coordinate with municipalities on the construction of new facilities, upgrades, significant maintenance activities, and routine maintenance activities. • For the construction of new facilities, alterations to existing facilities (including upgrades) or significant maintenance involving substantial disturbance of soil, water or vegetation which would regularly fall under the review requirements of certain local authorities (ie. Planning and Zoning Authority; Inland Wetlands Commission; Public Works Department; Historic District Commission), the utility shall at least notify and consult with such local authority, or its designated agent or staff, toward the development of mutually agreeable schedules and procedures for the proposed activity. • For routine maintenance activities or alterations to existing facilities (including upgrades) involving minor disturbance of soil, water or vegetation which would regularly fall under the review and approval requirements of certain local authorities, the utility shall make local authorities or their designated agent or staff aware of such ongoing activities. B.6 CT Department of Energy & Environmental Protection If the project requires formal permitting with the ACOE (Pre-Construction Notification (PCN) or Individual Permit), copies of the application should be forwarded to CT DEEP for review under Section 401 of the Clean Water Act. The CT DEEP requires that a GP Addendum form be completed and submitted along with the ACOE application. If the project qualifies for Self-Verification Notification (SVNF) under the ACOE GP, the project also is granted authorization (Water Quality Certification, WQC) with no formal application under Section 401 of the Clean Water Act, provided the project meets the additional WQC general conditions. The general conditions commonly applicable to utility projects include: • Prohibiting dumping of any quantity of oil, chemicals, or other deleterious material on the ground; • Immediately informing the CT DEEP Oil and Chemical Spill Response Division at (860) 424-3338 (24 hours) of any adverse impact or hazard to the environment including any discharge or spillage of oil or chemical liquids or solids; • Separating staging areas at the site from the regulated area s by silt fences or stray/hay bales at all times; • Prohibiting storage of any fuel and refueling of equipment within 25 feet from any wetland or watercourse; • Following the document “Connecticut Guidelines for Soil and Erosion Control,” inspecting employed controls at least once per week, after each rainfall, and at least daily during prolonged rainfall, and correcting any deficiencies within 48 hours of being found. Eversource Best Management Practices Manual –January 2022 Appendix B B-5 • Prohibiting the storage of any materials at the site which are buoyant, hazardous, flammable, explosive, soluble, expansive, radioactive, or which could in the event of a flood be injurious to human, animal or plant life, below the elevation of the • 500 year flood. Any other material or equipment stored at the site below this elevation must be firmly anchored, restrained or enclosed to prevent flotation. The quantity of fuel for equipment at the site stored below such elevation shall not exceed the quantity of fuel that is expected to be used by such equipment in one day. • Immediately informing CT DEEP at (860) 424-3019 and the ACOE at (617) 647- 8674 of the occurrence of pollution or other environmental damage in violation of the WQC, and within 48 hours support a written report including information specified in the general conditions. If the project falls within areas mapped by the Connecticut Natural Diversity Database, or is less than 0.50 miles upstream or downstream of a mapped area, a data request and possible coordination will be required with the Natural Diversity Database. If a project is located within tidal, coastal or navigable waters of the state or in tidal wetlands, permitting may be required with the CT DEEP LWRD. For the routine maintenance of previously permitted structures or structures that were in place prior to June 24, 1939, no permitting is required. For significant maintenance of previously permitted structures or structures that were in place prior to June 24, 1939, a Certificate of Permission is required. For new projects a Structures, Dredging and Fill Permit and/or a Tidal Wetlands Permit may be required. The CT DEEP LWRD should be consulted prior to preparing permits to conduct a pre-application meeting and determine the appropriate permitting route. B.7 U.S. Army Corps of Engineers Work within wetlands and waters of the United States is subject to jurisdiction under Section 404 of the Clean Water Act, which is administered by the ACOE. Work within navigable waters is also administered by the ACOE under Section 10 of the Rivers and Harbors Act of 1899. The ACOE has issued Department of the Army General Permits for the State of Connecticut and Land Located within the Boundaries of an Indian Reservation (CT GPs) which establishes categories for projects based on their nature of impacts. The current permit was issued on December 15, 2021, and expires on December 15, 2026. Applications are not required for Self-Verification (SV) projects, but submittal of a Self- Verification Notification Form (SVNF) before the work occurs and submittal of a Compliance Certification Form within one month after the work is completed is required. The SVNF and Compliance Certification Form entail self-certification by applicants that their project complies with the terms and conditions of SV under the CT GPs. Pre- Construction Notification (PCN) projects require the submittal of an application to the ACOE, followed by a screening of the application by the ACOE, the U.S. Fish and Wildlife Service (USFWS), U.S. Environmental Protection Agency (US EPA), National Marine Fisheries Service (NMFS) and CT DEEP, and consultation with the Connecticut Commission on Culture and Tourism and Tribal Historic Preservation Officers (THPOs). PCN projects may not proceed until written approval from the ACOE is received. Written approval is generally provided within 45 days of the multi-agency screening. After written approval is received, a Work-Start Notification Form must be submitted before the work occurs, and a Compliance Certification Form must be submitted within one month after the work is completed. Eversource Best Management Practices Manual –January 2022 Appendix B B-6 For work proposed within a FEMA floodway or floodplain, the ACOE recommends that the applicant apply for and receive a Flood Management Certification (if required), prior to applying to the ACOE. Additionally, applications for PCN inland projects that propose fill in ACOE jurisdiction must include an Invasive Species Control Plan (ISCP), unless otherwise directed by the ACOE. An Individual Permit (IP) requires a formal permit application to be submitted to the ACOE. The application is reviewed in detail by both state and federal agencies, and a Public Notice is released for public comment. Projects which trigger an IP generally result in significant impacts to wetlands and/or watercourses. Stream and wetland crossings are only subject to jurisdiction under the ACOE if there is a discharge of dredge or fill material into wetlands or waters of the United States. Equipment access through a stream or wetland with no structural BMP is not regulated by the ACOE if there is no discharge of dredge or fill material (note that equipment rutting as a result of not using an appropriate BMP can be considered a “disch arge of dredge material”). Similarly, the use of a timber or rail car bridge that extends from bank to bank with no stream impacts is not regulated by the ACOE. Additionally, the use of timber mats and stone is considered “fill material” by the ACOE, and must be calculated to determine overall impacts. Temporary mats are not counted towards the 1-acre PCN threshold if they are adequately cleaned after previous use, removed immediately after completion of construction and disposed of at an upland site. Maintenance, including emergency reconstruction of currently serviceable structures, is exempt from ACOE jurisdiction and does not require formal permitting. Maintenance does not include any modification that changes the character, scope, or size of the origina l fill design. Emergency reconstruction must occur within a reasonable period of time after damage occurs to qualify for this exemption. Stream and wetland crossings that involve the discharge of dredge and fill material may be conducted under SV if the work complies with the general conditions and SV criteria of the CT GPs. The following are SV criteria that are commonly applicable to stream and wetland crossings in utility rights of way. See Section 1.8 for additional criteria for culvert crossings: • The work results in less than 5,000 square feet of impacts to wetlands or Waters of the United States. Replacement of utility line projects with impacts solely within wetlands greater than 5,000 square feet may be eligible for SV Authorization after consultation with the ACOE about the specific project; • Temporary fill, with the exceptions of swamp and timber mats, discharged to wetlands shall be placed on geotextile fabric laid on the pre-construction wetland grade. Unconfined temporary fill discharged into flowing water (rivers and streams) shall consist only of clean stone. All temporary fill shall be removed as soon as it is no longer needed, and disposed of at an appropriate upland site. • Any unconfined in-stream work, including construction, installation or removal of sheet pile cofferdam structures, is conducted during the low -flow period between July 1 and September 30. However, installation of coffer dams, other than sheet pile cofferdams, is not restricted to the low -flow period and must be installed between July 1 and March 31 and must not encroach > 25% of the stream width measured from OHW during the prohibited work window; • No work will occur in the main stem or tributary streams of the Connecticut River watershed that are being managed for Atlantic salmon (Salmo salar). (Work of this Eversource Best Management Practices Manual –January 2022 Appendix B B-7 nature requires screening for potential impacts to designated Essential Fish Habitat.); • The work does not result in direct or secondary impacts to Special Wetlands, Threatened, Endangered or Special Concern Species, or Significant Natural Communities identified by the Connecticut Natural Diversity Database. Work within 750 feet of vernal pools shall be minimized; • The project does not require an ACOE permit with associated construction activities within 100 feet of Special Wetlands; • The project does not result in fill placed within a FEMA established floodway, unless the applicant has a State of Connecticut Flood Management Certification pursuant to Section 25-68d of the Connecticut General Statutes; • The project does not result in fill placed within a FEMA established floodplain that would adversely affect the hydraulic characteristics of the floodplain; • The project does not entail stormwater detention or retention in inland waters or wetlands; • The project is not located in a segment of a National Wild and Scenic River System (includes rivers officially designated by Congress as active study status rivers for possible inclusion) or within 0.25 miles upstream or downstream of the main stem or tributaries to such a system; • The project has no potential for an effect on a historic property which is listed or eligible for listing in the National Register of Historic Places; • The project does not impinge upon the value of any National Wildlife Refuge, National Forest, or any other area administered by the U.S. Fish and Wildlife Service, U.S. Forest Service or National Park Service; • Section 106 needs to be taken into account for all work that requires federal permitting – including SV; • The project does not use slip lining, plastic pipes, or High Density Polyethylene Pipes (HDPP). • Appropriate BMPs are employed in regard to heavy equipment in wetlands (General Condition 16) and sedimentation and erosion controls (General Condition 20). • Disturbed inland wetland areas are restored in accordance with General Condition 18. Stream and wetland crossings that involve the discharge of dredge and fill material may be conducted under PCN if the work complies with the general conditions and PCN criteria of the CT GPs. The following are PCN criteria that are commonly applicable to stream and wetland crossings in utility ROWs. See Section 1.8 for additional criteria for culvert crossings: • The work results in less than one acre of impacts to wetlands or Waters of the United States; • The project does not result in fill placed within a FEMA established floodplain that would adversely affect the hydraulic characteristics of the floodplain; • The project does not entail stormwater detention or retention in inland waters or wetlands. • Temporary fill, with the exceptions of swamp and timber mats, discharged to Eversource Best Management Practices Manual –January 2022 Appendix B B-8 wetlands shall be placed on geotextile fabric laid on the pre-construction wetland grade. Unconfined temporary fill discharged into flowing water (rivers and streams) shall consist only of clean stone. All temporary fill shall be removed as soon as it is no longer needed, and disposed of at an appropriate upland site. • Appropriate BMPs are employed in regard to heavy equipment in wetlands (General Condition 16) and sedimentation and erosion controls (General Condition 20). • Disturbed inland wetland areas are restored in accordance with General Condition 18. Stream and wetland crossings that cannot meet SV or PCN criteria may require review under an IP. The ACOE should be consulted before assuming an IP will be required, as exceptions can be made under certain circumstances. GP1. Aids to navigation & temporary recreational structures (Coastal only) GP2. Repair or maintenance of existing currently serviceable, authorized or grandfathered structures/fills and removal of structures (Coastal and Inland) GP3. Moorings (Coastal only) GP4. Pile-supported structures & floats, including boat lifts/hoists & other miscellaneous structures & work (Coastal only) GP5. Boat ramps and marine railways (Coastal and Inland) GP6. Utilities including lines, outfall and intake structures and appurtenant structures (Coastal and Inland) GP7. Dredging, transport & disposal of dredged material, beach nourishment & rock removal and rock relocation (Coastal only) GP8. Discharges of dredged or fill material incidental to the co nstruction of bridges (Coastal only) GP9. New shoreline and bank stabilization projects and Living Shorelines (Coastal and Inland) GP10. Aquatic habitat restoration, establishment and enhancement activities (Coastal and Inland) GP11. Fish and wildlife harvesting activities (Coastal and Inland) GP12. Oil spill and hazardous material response operations (Coastal and Inland) GP13. Cleanup of hazardous and toxic waste and removal of contaminated soil (Coastal and Inland) GP14. Scientific measurement and monitoring devices (Coastal and Inland) GP15. Survey and exploratory survey activities (Coastal and Inland) GP16. Aquaculture & Mariculture Activities (Coastal only) GP17. New and expansion of recreational, residential, institutional, and commercial developments (Inland only) GP18. Wetland crossings for linear transportation projects (Inland only) GP19. Stream, river and brook crossings (not including wetland crossings) (Coastal and Inland) GP20. Energy generation and renewable energy generation facilities and hydropower projects (Coastal and Inland) GP21. Temporary fill not associated with a regulated General Permit activity (Inland only) GP22. Modification and Improvement of Existing Minor drainage features and Mosquito Control (Coastal only) GP23. Agricultural Activities (Inland only) Eversource Best Management Practices Manual –January 2022 Appendix B B-9 B.8 Culvert Installation New culvert installation or existing culvert replacements will require notification or consultation with municipal staffers which might include the Department of Public Works and/or the inland wetlands officer, and may require permitting with the ACOE under Section 404 of the Clean Water Act or Section 10 of the Rivers and Harbors Act of 1899, and the CT DEEP under Section 401 of the Clean Water Act. Coordination with CT DEEP may also be required for projects located within areas mapped by the Connecticut N atural Diversity Database. For work within tidal, coastal or navigable waters or in tidal wetlands, permitting will be required with the CT DEEP LWRD. B.8.1 Municipal Permitting See Section 1.5 for general local permitting guidance. • For the installation of new culverts and the replacement of culverts that involve substantial disturbance of soil, water or vegetation which would regularly fall under the review and approval requirements of certain local authorities (i.e., Planning and Zoning Authority; Inland Wetlands Commission; Public Works Department; Historic District Commission), the utility shall at least notify and consult with such local authority, or its designated agent or staff, toward the development of mutually agreeable schedules and procedures for the proposed activity. • For the replacement of culverts involving only minor disturbance of soil, water or vegetation which would regularly fall under the review and approval requirements of certain local authorities, the utility shall make local authorities or their designated agent or staff aware of such ongoing activities. B.8.2 CT Department of Energy & Environmental Protection If the project requires formal permitting with the ACOE, copies of the application should be forwarded to CT DEEP for review under Section 401 of the Clean Water Act. CT DEEP requires that a PGP Addendum form be completed and submitted along with the ACOE application. If a culvert project falls within areas mapped by the Connecticut Natural Diversity Database or falls within 0.50 miles upstream or downstream of a mapped area, a data request and possible coordination will be required with the Natural Diversity Database. If a culvert project is located within tidal, coastal or navigable waters of the state or in tidal wetlands, permitting will be required with the CT DEEP LWRD. For new projects a Structures, Dredging and Fill Permit and/or a Tidal Wetlands Permit will be required. For replacement structures which were previously permitted, or which were in place prior to June 24, 1939, a Certificate of Permission may only be required, which entails a shorter permitting process. B.8.3 U.S. Army Corps of Engineers See Section 1.7 for general ACOE permitting requirements. Open bottom arches, bridge spans or embedded culverts are preferred over traditional culverts and are required for SV projects. However, where site constraints make these approaches impractical, the ACOE should be consulted. New bridge or open-bottom structure crossings may be conducted under SV or PCN if the following criteria are met in addition to meeting any applicable general criteria listed in section 1.7 of this manual: • The work spans at least 1.2 times the watercourse bank full width; Eversource Best Management Practices Manual –January 2022 Appendix B B-10 • The structure has an openness ratio equal to or greater than 0.25 meters; • The structure allows for continuous flow of the 50-year frequency storm flows. New culvert installations may be conducted under SV if the work complies with the general conditions and SV criteria of the CT GPs. The following are SV criteria that are commonly applicable to new culvert installations in utility right of ways: • Work is conducted in accordance with the design requirements listed in Section 3.1.3 of the BMP Manual; Plastic and High Density Polyethylene Pipes (HDPE) are not used; • The work results in less than 5,000 square feet of impacts to wetlands or Waters of the United States; • Any unconfined in-stream work, including construction, installation or removal of sheet pile coffer dam structures, is conducted during the low-flow period between July 1 and September 30, except in instances where a specific written exception has been issued by the Connecticut Department of Energy & Environmental Protection. However, installation of coffer dams, other than sheet pile coffer dams, is not restricted to the low-flow period; • No open trench excavation is conducted within flowing waters. Work within flowing waters can be avoided by using temporary flume pipes, culverts, coffer dams, etc. to isolate work areas and maintain normal flows; • The tributary watershed to the culvert does not exceed 1.0 square mile (640 acres); • The culvert gradient (slope) is not steeper than the streambed gradient immediately upstream or downstream of the culvert; • For a single box or pipe arch culvert crossing, the inverts are set not less than 12 inches below the streambed elevation; • For a multiple box or pipe arch culvert crossing, the inverts of one of the boxes or pipe arch culverts are set not less than 12 inches below the elevation of the streambed; • For a pipe culvert crossing, the inverts are set such that not less than 25% of the pipe diameter or 12 inches, whichever is less, is set below the streambed elevation; • The culvert is backfilled with natural substrate material matching upstream and downstream streambed substrate; • The structure does not otherwise impede the passage of fish and other a quatic organisms; • The structure allows for continuous flow of the 50-year frequency storm flows; • The work does not result in direct or secondary impacts to Special Wetlands, Threatened, Endangered or Special Concern Species, or Significant Natural Communities identified by the Connecticut Natural Diversity Database. Work within 750 feet of vernal pools shall be minimized; • The project does not require an ACOE permit with associated construction activities within 100 feet of Special Wetlands; • The project does not result in fill placed within a FEMA established floodway, unless the applicant has a State of Connecticut Flood Management Certification pursuant to section 25-68d of the Connecticut General Statutes; Eversource Best Management Practices Manual –January 2022 Appendix B B-11 • The project does not result in fill pl aced within a FEMA established floodplain that would adversely affect the hydraulic characteristics of the floodplain; • The project does not entail stormwater detention or retention in inland waters or wetlands; • The project is not located in a segment of a National Wild and Scenic River System (includes rivers officially designated by Congress as active study status rivers for possible inclusion) or within 0.25 miles upstream or downstream of the main stem or tributaries to such a system; • The project has no potential for an effect on a historic property which is listed or eligible for listing in the National Register of Historic Places; • The project does not impinge upon the value of any National Wildlife Refuge, National Forest, or any other area administered by the U.S. Fish and Wildlife Service, U.S. Forest Service or National Park Service. • Appropriate BMPs are employed with regard to sedimentation and erosion controls (General Condition 20). New culvert installations may be conducted under PCN if the work complies with the general conditions and PCN criteria of the GP. The following are PCN criteria that are commonly applicable to new culvert installations in utility right of ways: • Work is conducted in accordance with the design requirements listed in Section 3.1.3 of the BMP Manual; • The work results in less than one acre of impacts to wetlands or Waters of the United States; • The project does not result in fill placed within a FEMA established floodplain that would adversely affect the hydraulic characteristics of the floodplain; • There is no practicable alternative location for the crossing that would have less environmental impacts; • The use of a bridge or open-bottom structure is determined to be not practicable; • For a single box or pipe arch culvert crossing, the inverts are set not less than 12 inches below the streambed elevation; • For a multiple box or pipe arch culvert crossing, the inverts of one of the boxes or pipe arch culverts are set not less than 12 inche s below the elevation of the streambed; • For a pipe culvert crossing, the inverts are set such that not less than the pipe diameter or 12 inches, whichever is less, is set below the streambed elevation; • The culvert is backfilled with natural substrate material matching upstream and downstream streambed substrate; • The culvert has an openness ratio equal to or greater than 0.25 meters; • The structure does not result in a change in the normal water surface elevation of the upstream waters or wetlands; • The structure allows for continuous flow of the 50-year frequency storm flows; • Appropriate BMPs are employed with regard to sedimentation and erosion controls (General Condition 20). Eversource Best Management Practices Manual –January 2022 Appendix B B-12 New culvert installations that cannot meet SV or PCN criteria may require review under an IP. The ACOE should be consulted before assuming an IP will be required, as exceptions can be made under certain circumstances. In-kind replacement of culverts using the same materials is exempt from Section 404 of the Clean Water Act, and does not require permitting with the ACOE. The ACOE, however, should be consulted before assuming an activity is exempt from their jurisdiction. Consult with Eversource Environmental Licensing and Permitting. Bridge or open-bottom structure replacements may be conducted under SV if the conditions for a new bridge or open -bottom structure replacement have been met. In addition, bridge or open-bottom structure replacements should not result in a change in the normal surface elevation of the upstream waters or wetland, and the replacement structure should have a riparian bank on one or both sides for wildlife passage. Culvert replacements may be conducted under SV if the conditions for new culvert installation are met. Bridge or open-bottom structure replacements may be conducted under PCN if the conditions for a new bridge or open-bottom structure replacement have been met. Culvert replacements may be conducted under PCN if the following conditions are met: • The work results in 5,000 square feet to less than one acre of impacts to wetlands or Waters of the United States; • The use of a bridge or open-bottom structure is determined to be not practicable; • For a single box or pipe arch culvert crossing, the inverts are set not less than 12 inches below the streambed elevation; • For a multiple box or pipe arch culvert crossing, the inverts of one of the boxes or pipe arch culverts are set not less than 12 inches below the elevation of the streambed; • For a pipe culvert crossing, the inverts are set such that not less than the pipe diameter or 12 inches, whichever is less, is set below the streambed elevation; • The culvert is backfilled with natural substrate material matching upstream and downstream streambed substrate; • The culvert has an openness ratio equal to or greater than 0.25 meters; • The structure does not result in a change in the normal water surface elevation of the upstream waters or wetlands; • The structure allows for continuous flow of the 50-year frequency storm flows; • Appropriate BMPs are employed with regard to sedimentation and erosion controls (General Condition 20). APPENDIX C Table of Contents C-i Appendix C C.1 Applicable Laws/Regulations ............................................................C- 1 C.2 Geographic Areas Subject to Jurisdiction ...........................................C- 1 C.2.1 Endangered Species ..............................................................C-2 C.2.2 Vernal Pools ........................................................................C- 2 C.2.3 Essential Fish Habitat and Wild & Scenic River Designation ........C- 2 C.2.4 Cold Water Fisheries Resources ..............................................C- 3 C.2.5 Outstanding Resource Waters ................................................C- 3 C.2.6 Historic and Cultural Resources ..............................................C- 3 C.3 Applicable Regulatory Agencies ........................................................C- 3 C.4 Maintenance, Repair, or Emergency Projects .......................................C-4 C.4.1 Maintain, Repair and/or Replace .............................................C- 4 C.4.2 Emergency Projects ..............................................................C- 4 C.5 Municipal Permitting .......................................................................C- 5 C.6 MA Department of Environmental Protection ......................................C- 7 C.7 U.S. Army Corps of Engineers ..........................................................C- 8 C.8 Temporary Stream Crossings .........................................................C- 13 C.8.1 U.S. Army Corps of Engineers ..............................................C- 13 Appendix C C-1 Eversource Best Management Practices Manual –January 2022 Appendix C – Massachusetts Environmental Regulations C.1 Applicable Laws/Regulations In Massachusetts, there are no fewer than nine potentially pertinent regulatory programs associated with activities proposed in environmentally sensitive areas. The following list of laws and regulations are most likely to apply to electrical utility projects in the Commonwealth. • Massachusetts Wetlands Protection Act (M.G.L. 131 § 40) (MA WPA) • Municipal wetland bylaws/ordinances (varies by municipality) • Massachusetts Endangered Species Act (M.G.L. 131A) (MESA) • “Chapter 91” Public Waterfront Act (M.G.L. c. 91 §§ 1 through 63) • Massachusetts Environmental Policy Act (M.G.L. c. 30 §§ 61 through 62H) (MEPA) • Section 10 of the Rivers and Harbors Act of 1899 (33 U.S.C. § 403) • Section 401 of the Clean Water Act (33 U.S.C. § 1251; 314 CMR 9.00) o Administrative Consent Order (ACO) • Section 404 of the Clean Water Act (33 U.S.C. § 1344) • Massachusetts Watershed Protection Act (M.G.L. 92A §1/2) (MA WsPA) C.2 Geographic Areas Subject to Jurisdiction The following areas are subject to regulatory jurisdiction by at least one of the regulatory programs discussed in this section: It is important to note that more than one jurisdictional resource area type may be present at any given location. • Massachusetts Wetlands Protection Act Resource Areas: o (Coastal) Land Under the Ocean; Designated Port Areas; Coastal Beaches; Coastal Dunes; Barrier Beaches; Coastal Banks; Rocky Intertidal Shores; Salt Marshes; Land Under Salt Ponds; Land Containing Shellfish; Banks of or Land Under the Ocean, Ponds, Streams, Rivers, Lakes or Creeks that Underlie Anadromous/Catadromous (“Fish Run”); Land Subject to Coastal Storm Flowage o (Inland). Bank; Bordering Vegetated Wetland; Land Under Water Bodies and Waterways; Land Subject to Flooding; 200-foot Riverfront Area; and the 100-foot Buffer Zone to Bank and BVW • Areas subject to municipal wetlands bylaws or ordinances (note: varies by community) • Estimated and/or Priority Habitat of State-listed Rare Species • Outstanding Resource Waters (ORWs; include Certified Vernal Pools, public surface water drinking supplies, tributaries to drinking water supplies and vegetated wetlands adjacent thereto) • Essential Fish Habitat (EFH) • Areas of Critical Environmental Concern (ACECs) • Great Ponds Appendix C C-2 Eversource Best Management Practices Manual –January 2022 • Navigable waterways • Wild and Scenic Rivers • Quabbin Reservoir, Ware River and Wachusett Reservoir watersheds C.2.1 Endangered Species The Massachusetts Natural Heritage and Endangered Species Program (NHESP), a department of the Massachusetts Division of Fisheries and Wildlife (MassWidlife) maintains the current list of rare and endangered species and species of special concern in Massachusetts. Publicly available data only allows for identification of designated Priority Habitats of Rare Species and Estimated Habitats of Rare Wildlife, not specific species information. Priority and Estimated Habitat locations are available online via the Massachusetts Geographic Information System (MassGIS) viewer. Species specific information is provided for planned linear transmission maintenance activities which are reviewed by NHESP as part of Eversource’s annual Operation and Maintenance (O&M) Plan. Projects/ activities which are not covered in the O&M Plan must file an independent request for information or initiate coordination with NHESP through Eversource Environmental Licensing and Permitting. Applicable regulations and agency are listed below: • Massachusetts Endangered Species Act: 321 CMR 10.00 – Division of Fisheries and Wildlife – NHESP C.2.2 Vernal Pools NHESP maintains a database of certified and potential vernal pools in Massachusetts. These data are available on the NHESP website and MassGIS. Certified Vernal Pools (CVP) are considered Outstanding Resource Waters (ORWs). The current version of the Department of the Army General Permits for the Commonwealth of Massachusetts (MA GPs), effective date April 16, 2018 (expiration date: April 5, 2023) includes General Conditions for protection of vernal pools, regardless of whether or not the vernal pool is certified by NHESP, and including the vernal pool depression, the vernal pool envelope (area within 100 feet of the vernal pool depression’s edge), and the critical terrestrial habitat (area within 100-750 feet of the vernal pool depression’s edge). Temporary impacts associated with construction mats in previously disturbed areas of existing utility projects rights-of-way are exempt from GP requirements regarding work in the vernal pool envelope or critical terrestrial habitat, provided that a V egetation Management Plan (VMP) exists that avoids, minimizes and mitigates impacts to aquatic resources. Applicable regulations and agencies for Certified Vernal Pools (CVPs) are listed below: • Wetlands Protection Act: 310 CMR 10.00 – Municipal Conservation Commissions (and MassDEP) • 401 Water Quality Certification for Discharge of Dredged or Fill Material, Dredging, and Dredged Material Disposal in Waters of the U.S. within the Commonwealth: 314 CMR 9.00 – MassDEP • Department of the Army General Permits for the Commonwealth of Massachusetts – ACOE C.2.3 Essential Fish Habitat and Wild & Scenic River Designation Essential Fish Habitat (EFH) is a habitat essential for spawning, breeding, feeding, or growth to maturity of federally managed species. This website provides more information: https://www.fisheries.noaa.gov/region/new-england-mid-atlantic#habitat. Consultation Appendix C C-3 Eversource Best Management Practices Manual –January 2022 with the ACO is recommended to confirm the location of Essential Fish Habitat with respect to a proposed project. Massachusetts has approximately 8,229 miles of river, of which 147.1 miles are designated as wild & scenic, as summarized below: • Nashua River (Main Stem from the confluence of the North and South Rivers in Lancaster, and extending north to the MA-NH border; some geographic exclusions) • Squannacook River (from headwaters in Ash Swamp/Townsend, extending downstream to the confluence with the Nashua River in Shirley/Ayer; some geographic exclusions) • Nissitissit River (from headwaters in Brookline (NH) to confluence with the Nashua River in Pepperell) • Sudbury River (14.9-mile segment from Danforth Street Bridge/Framingham downstream to the Route 2 Bridge/Concord; 1.7 -mile segment • Assabet River • Concord River • Westfield River (Main Stem, East Branch, Middle Branch, West Branch, and named tributaries • Taunton River (main stem from headwaters at the confluence of the Town and Matfield Rivers (Bridgewater) downstream 40 miles to confluence with the Quequechan River at the Route 195 Bridge (Fall River) Currently, there are no river segments under study in Massachusetts for National Wild and Scenic designation (https://www.rivers.gov/study.php). Wild and Scenic designations should be verified via the National Wild and Scenic Rivers System website (https://www.rivers.gov/massachusetts.php) during project planning and permitting. The ACOE reviews projects for impacts to both EFH and National Wild and Scenic Rivers. • Department of the Army General Permits for the Commonwealth of Massachusetts – ACOE C.2.4 Cold-water Fishery Resources The Massachusetts Division of Fisheries and Wildlife (MassWildlife) maintains a list of waters that are known to have cold-water fishery resources (CFRs) which are waters in which the mean of the maximum daily temperature over a seven day period generally does not exceed 68°F (20°C) and, when other ecological factors are favorable (such as habitat), are capable of supporting a year round population of cold-water stenothermal aquatic life. CFRs are not currently regulated in and of themselves in Massachusetts. However, MassDEP is particularly concerned with water quality impacts to CFRs due to erosion and sedimentation as a result of construction projects. Appendix C C-4 Eversource Best Management Practices Manual –January 2022 C.2.5 Outstanding Resource Waters Outstanding Resource Waters (ORWs) include Certified Vernal Pools (CVPs), surface drinking water supplies, tributaries to surface drinking water supplies and vegetated wetlands adjacent thereto. CVPs are designated by NHESP and locations are available through MassGIS. Locations of surface drinking water supplies and other ORWs, typically identified as Zone A, are also available through MassGIS. The applicable regulations and agency are listed below: • 401 Water Quality Certification for Discharge of Dredged or Fill Material, Dredging, and Dredged Material Disposal in Waters of the U.S. within the Commonwealth: 314 CMR 9.00 – MassDEP C.2.6 Historic/Cultural Resources The Massachusetts Historical Commission (MHC) is the State Historical Preservation Office (SHPO) and, along with the Board of Underwater Archaeological Resources (BUAR), are the state agencies responsible for protecting the Commonwealth’s historic and cultural resources. Additional stakeholders for cultural resources include the Massachusetts Commission on Indian Affairs, Native American tribes with interests in the state, and local historical commissions. C.3 Applicable Regulatory Agencies Activities subject to jurisdiction under the above-referenced programs will generally be subject to review by one or more regulatory agencies (refer to list below). New stream and wetland crossings not related to maintenance will require permitting with municipal Conservation Commissions, and may require permitting with the U.S. Army Corps of Engineers (ACOE) and Massachusetts Department of Environmental Protection (MassDEP) under Sections 404 and 401 of the Clean Water Act. Any non -maintenance work within Land Under Water will require permitting with the MassDEP Division of Wetlands and Waterways. Coordination with NHESP may also be required for projects located within areas mapped as Priority and/or Estimated Habitat for state-listed rare species. For work within navigable waters, consultation may be required with the Massachusetts Office of Coastal Zone Management (MA CZM). • Municipal Conservation Commissions • Massachusetts Department of Environmental Protection (MassDEP) Division of Wetlands and Waterways • Massachusetts Division of Fisheries and Wildlife: Natural Heritage and Endangered Species Program (NHESP) • Massachusetts Executive Office of Energy and Environmental Affairs (EEA) • United States Army Corps of Engineers (ACOE) New England District • Massachusetts Office of Coastal Zone Management (MA CZM) • Massachusetts Division of Conservation and Recreation (MA DCR) C.4 Maintenance, Repair, or Emergency Projects Most regulatory programs contain provisions that allow normal maintenance of existing structures and/or response to emergency situations that require immediate attention. C.4.1 Maintain, Repair and/or Replace Exemptions or considerations for maintenance, repair, and/or replacement of existing electrical utility structures exist in some environmental regulations, but not all. The exemptions are limited to work related to existing and lawfully located structures where Appendix C C-5 Eversource Best Management Practices Manual –January 2022 no change in the original structure or footprint is proposed. It is not for the selected contractor of a particular project to make a determination as to whether an activity is exempt. This determination will be made prior to the commencement of work by the Eversource project manager in consultation with Eversource Environmental Licensing and Permitting. These exemptions/considerations are afforded at: • MAWPA (M.G.L Chapter 131, § 40, paragraph 1) • MAWPA regulations for Riverfront Area (310 CMR 10.58(6)) • MEPA regulations (301 CMR 11.01(2)(b)(3)) • 33 CFR Part 323.4(a)(2) • MESA (M.G.L. Chapter 131A, § 3; 321 CMR 10.14(5-7) and (12) • MAWPA (350 CMR 11.05(11) and (12)) • National Pollutant Discharge Elimination System (NPDES), Construction General Permit (as modified effective February 16, 2012) Certain operation and maintenance activities that will directly impact Waters of the United States through the discharge of fill (e.g., construction mats) are subject to Sections 401 and 404 of the Clean Water Act. C.4.2 Emergency Projects Emergency provisions are generally afforded to activities that need to abate conditions that pose a threat to public health or safety. These provisions generally do not allow work beyond what is necessary to abate the emergency condition and will generally require an after-the-fact permit. It is not for the selected contractor of a particular project to make a determination as to whether an activity is an emergency. This determination will be made prior to work by the Eversource project manager, in consultation with Eversource environmental staff. It is important to note that invocation of an emergency provision does not release the project proponent from reporting requirements. Emergency provisions are afforded at: • MAWPA regulations (310 CMR 10.06) • MEPA (301 CMR 11.00) • MA 401 WQC (314 CMR 9.12) • Chapter 91 (310 CMR 9.20) • MESA (321 CMR 10.15) C.5 Municipal Permitting Work within wetlands, watercourses and Buffer Zones typically requires permitting with municipal Conservation Commissions. Work that entails “maintaining, repairing or replacing, but not substantially changing or enlarging, an existing and lawfully located structure or facility used in the service of the public and used to provide electric service” is exempt under the Massachusetts Wetlands Protection Act (MA WPA) per MGL Chapter 131 Section 40. However, individual municipalities may establish their own wetland s bylaws under Home Rule authority which could require permitting for operation and maintenance activities. The following table lists communities in which Eversource operates and maintains infrastructure and which have a wetland bylaw. Appropriate municipal Appendix C C-6 Eversource Best Management Practices Manual –January 2022 permitting or notification should be completed in these towns as required prior to conducting operation and maintenance activities. Bylaws may be revised, or new bylaws enacted, at any time. Consult with Eversource Environmental Licensing and Permitting prior to the commencement of work. TABLE C-1 Eversource Energy Communities with Municipal Wetland Bylaws1 Community Date of Bylaw Utility Maintenance Exemption Notification Required Acton 7/8/2003 Yes No Amherst 2/12/2014 Yes Yes Andover 5/11/1999 Yes Yes Aquinnah 6/23/2020 Yes Yes Arlington 5/15/2000 No Yes Ashland 5/6/2009 Yes Yes Attleboro 12/12/2007 No No Auburn 5/1/2012 Yes Yes Avon 5/7/2019 Yes Yes Barnstable 11/7/1987/rev. 7/7/2003 Yes Yes Bedford 1987/rev. 2016 Yes Yes Belchertown 6/7/2020 Yes Yes Bellingham 12/2015 No Yes Berlin 2/15/2021 Yes Yes Bolton 5/7/2012 Yes No Boston 12/11/2019 Yes Yes Bourne 10/26/2009 No Yes Brewster 1/1/2013 Yes Yes Bridgewater 11/13/1990 Yes Yes Brookline 5/28/2013 Yes Yes Burlington 5/2021 Yes Yes Canton 5/10/2017 Yes Yes Carlisle 2002 Yes No Carver 1998 Yes Yes Chatham 5/10/2004 Yes Yes Chicopee 4/3/2002 Yes Yes Chilmark 10/12/1993 No Yes Dartmouth 1990/rev. 8/25/2015 Yes Yes Dedham 11/182013 Yes Yes Deerfield 11/6/1989 Yes Yes Dennis 5/5/1989 Yes Yes Dover 5/2/1994 Yes Yes Duxbury Yes No East Longmeadow 10/1992 Yes Yes Eastham 1980/rev. 1999 Yes Yes Edgartown 1985/rev. 6/25/1991 No Yes Fairhaven 5/10/1988 Yes No Falmouth 4/2/1979/rev. 7/16/1993 Yes Yes Appendix C C-7 Eversource Best Management Practices Manual –January 2022 TABLE C-1 Eversource Energy Communities with Municipal Wetland Bylaws1 Community Date of Bylaw Utility Maintenance Exemption Notification Required Framingham 4/26/2005 Yes Yes Grafton 5/11/1987 Yes Yes Greenfield 11/23/2001 Yes No Hadley 5/1/2008 No Yes Hampden 8/5/1992 Yes Yes Harwich 7/1/2003/rev. 11/25/2020 No Yes Holden 2011 Yes Yes Holliston 5/2021 Yes Yes Hopkinton 5/2/1995/rev. 5/7/2012 Yes Yes Holyoke 11/2005 Yes Yes Kingston 2004 No Yes Leicester 11/2015 Yes Yes Lenox3 12/18/1985 Yes No Lexington 5/3/1982 No Yes Lincoln 3/24/2007 No Yes Longmeadow 10/2000 Yes No Ludlow 5/1/2002 Yes No Marshfield 1988/rev. 4/23/2018 Yes Yes Mashpee 2/1/1988 Yes Yes Maynard 12/3/2005 Yes Yes Medfield 1926 Yes No Medway 7/2014 Yes Yes Milford 5/2010 Yes No Millis 5/13/1191 Yes No Millville 5/13/2013 Yes Yes Natick 4/27/2000 Yes No Needham 9/1/1988 Yes Yes New Bedford 2017 Yes Yes Norfolk 11/9/2010 Yes Yes Northampton 8/17/1989 Yes Yes Northborough 5/21/1990 Yes Yes Northbridge 5/6/2008 Yes Yes Oak Bluffs 4/1983 No Yes Orleans 5/5/1987 Yes Yes Palmer 8/12/2013 Yes Yes Pelham 5/2/1987 Yes Yes Pembroke 4/22/2008 Yes No Plymouth 4/5/1989 Yes Yes Plympton 5/16/2012 Yes Yes Provincetown 5/2019 Yes Yes Richmond 5/2015 Yes Yes Rochester As of 12/2015 Yes Yes Appendix C C-8 Eversource Best Management Practices Manual –January 2022 TABLE C-1 Eversource Energy Communities with Municipal Wetland Bylaws1 Community Date of Bylaw Utility Maintenance Exemption Notification Required Sandwich 5/4/1992 Yes Yes Sharon As of 12/2015 Yes No Sherborn 2013 Yes No Shutesbury 5/2/1987 Yes Yes Southampton 9/21/2021 Yes Yes Southborough 4/10/1995 Yes Yes South Hadley 12/27/2005 No Yes Southwick 6/6/1989 Yes Yes Springfield 5/5/1993 Yes Yes Stoneham 4/2013 Yes Yes Stow 5/21/2003 No Yes Sudbury Yes Yes Sunderland 4/27/1990 Yes Yes Sutton 5/11/2015 Yes Yes Tisbury 1/1/1983 Yes No Truro 9/30/2010 No Yes Upton 2009 Yes Yes Walpole 2002 Yes Yes Wareham 4/25/2016 Yes Yes Watertown 10/2010 Yes Yes Wayland 5/1/2002 Yes No Wellfleet 4/20/1986/rev. 10/6/2021 Yes Yes Wendell 3/10/1988 Yes Yes West Tisbury 6/3/2004 Yes Yes Westborough 10/20/2008 Yes Yes Westfield 5/20/2003 Yes Yes Westport4 4/11/1995 No Yes Westwood 1989 Yes Yes Wilbraham 5/27/1997 Yes Yes Winchester No Yes Woburn 6/24/1987 Yes Yes Worcester 7/1/2007 Partial Yes Yarmouth 12/1/2016 No Yes 1 Information based on the Massachusetts Association of Conservation Commissions website as of 2019 and municipal websites. 2 Refer to municipal bylaws prior to conducting work in the community. 3 Berkshire Scenic Mountain Act, as adopted by the Town of Lenox and administered by the Lenox Conservation Commission. 4 Town of Westport Soil Conservation Bylaw, as administered by the Westport Conservation Commission. . C.6 MA Department of Environmental Protection Review and approval under the Commonwealth’s Water Quality Certification Regulations Appendix C C-9 Eversource Best Management Practices Manual –January 2022 is required for “discharge of dredged or fill materials, dredging, and dredged material disposal activities in waters of the United States within the Commonwealth which require federal licenses or permits and which are subject to state water quality certification under 33 U.S.C. 1251, et seq. The federal agency issuing a permit initially determines the scope of geographic and activity jurisdiction” (314 CMR 9.01(2)). An individual Water Quality Certification is required from the Massachusetts Department of Environmental Protection (MassDEP) for any activity identified at 314 CMR 9.04. In accordance with 314 9.04 (4) activities which are exempt from MGL Chapter 131 Section 40 but are subject to 33 U.S.C. 1251, et seq., and will result in any discharge of dredge or fill material to bordering vegetated wetlands or land under water require an individual 401 Water Quality Certification. Eversource entered into an Administrative Consent Order (ACO) with MassDEP in 2017. This ACO serves as a general permit under the 401 Water Quality regulations (314 CMR 9.00) and establishes general conditions for routine operation and maintenance activities within existing ROWs. C.7 U.S. Army Corps of Engineers Work within wetlands and waters of the United States is subject to jurisdiction under Section 404 of the Clean Water Act, which is administered by the ACOE. The General Permits for the Commonwealth of Massachusetts (MA GPs) establish categories for projects based on their nature of impacts. The MA GPs were most recently issued on April 16, 2018, and expire on April 5, 2023. Certain minor activities are eligible for Self-Verification (SV), which requires submittal of a Self-Verification Notification Form (SVNF) prior to the commencement of work. Activities eligible for Self-Verification are authorized under the MA GPs and may proceed without written verification from the ACOE as long as the SVNF has been submitted and the activity meets the terms and conditions of the applicable MA GPs. Activities requiring Pre-Construction Notification (PCN) require the submittal of an application to the ACOE, followed by a screening of the application by the ACOE, the U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, National Marine Fisheries Service, MassDEP, and consultation with the Massachusetts Historical Commission, Tribal Historic Preservation Officers (THPOs) and the Massachusetts Board of Underwater Archaeological Resources (BUAR). PCN projects may not proceed until written verification from the ACOE is received. An Individual Permit (IP) requires a formal permit application to be submitted to the ACOE. The application is reviewed in detail by both state and federal agencies, and a public notice is released for public comment. Projects which trigger an Individual Permit generally result in significant impacts to wetlands and/or watercourses outside the limits of the MA GPs. Work within, or above, Navigable Waters is also administered by the ACOE under Section 10 of the Rivers and Harbors Act of 1899. ACOE permitting does not apply to activities that fall under the maintenance exemption set forth at 33 CFR 323.4(a)(2) – Discharges Not Requiring Permits: “Maintenance, including emergency reconstruction of recently damaged parts, of currently serviceable structures such as dikes, dams, levees, groins, riprap, breakwaters, causeways, bridge abutments or approaches, and transportation structures. Maintenance does not include any modification that changes the character, scope, or size of the original fill design. Emergency reconstruction must occur within a reasonable period of time after damage occurs in order to qualify for this exemption.” Appendix C C-10 Eversource Best Management Practices Manual –January 2022 Maintenance projects that occurred prior to the ACOE jurisdiction over fill activities, or that were properly permitted, can proceed under the maintenance exemption noted above, provided that the same temporary fill areas are used. However, it is recommended that a formal determination be requested from the ACOE to confirm these activities are exempt. The repair, rehabilitation or replacement of a previously authorized, currently serviceable structure or fill (with some minor deviations in the structure’s configuration or filled area) are regulated under MA GP1 and subject to SV or PCN. Also, operation and maintenance related activities that do not meet the above exemption may qualify for SV. In that case, it is recommended that a copy of the SVNF be submitted to MassDEP. The MA GPs are listed below. MA GPs specifically, and typically, applicable to utility projects are emphasized by bold italic font: GP1. Repair, Replacement and Maintenance of Authorized Structures and Fills GP2. Moorings GP3. Pile-Supported Structures, Floats and Lifts GP4. Aids to Navigation, and Temporary Recreational Structures GP5. Dredging, Disposal of Dredged Material, Beach Nourishment, and Rock Removal and Relocation GP6. Discharges of Dredged or Fill Material Incidental to the Construction of Bridges GP7. Bank and Shoreline Stabilization GP8. Residential, Commercial and Institutional Developments, and Recreational Facilities GP9. Utility Line Activities GP10. Linear Transportation Projects Including Stream Crossings GP11. Mining Activities GP12. Boat Ramps and Marine Railways GP13. Land and Water-Based Renewable Energy Generation Facilities and Hydropower Projects GP14. Temporary Construction, Access, and Dewatering GP15. Reshaping Existing Drainage Ditches, New Ditches, and Mosquito Management GP16. Response Operations for Oil and Hazardous Substances GP17. Cleanup of Hazardous and Toxic Waste GP18. Scientific Measurement Devices GP19. Survey Activities GP20. Agricultural Activities GP21. Fish and Wildlife Harvesting and Attraction Devices and Activities GP22. Habitat Restoration, Establishment and Enhancement Activities GP23. Previously Authorized Activities In general, the following cumulative thresholds apply for determining the level of ACOE permitting required: Table C-2 MA GPs Permits Limits Resources SV Limits (SV Eligible) PCN Limits (PCN Eligible) IP Limits (IP Required) Non-tidal waters of the US 0 to 5,000 sf 5,000 sf to 1 acre >1 acre Tidal waters of the US Not eligible All discharges ≤1/2 acre >1/2 acre SAS in tidal waters of the US excluding vegetated shallows Not eligible All discharges ≤1,000 sf >1,000 sf Appendix C C-11 Eversource Best Management Practices Manual –January 2022 SAS in tidal waters of the US consisting of vegetated shallows only Not eligible All discharges ≤100 sf (compensatory mitigation is required >100 sf *Special Aquatic Sites (SAS) consist of wetlands, mud flats, vegetated shallows, sanctuaries and refuges, coral reefs, and riffle and pool complexes. These are defined at 40 CFR 230 Subpart E. Stream and wetland crossings are only subject to jurisdiction under the ACOE if there is a discharge of dredge or fill material into wetlands or waters of the United States . Equipment access through a stream or wetland with no structural BMP is not regulated by the ACOE if there is no discharge of dredge or fill material (note that equipment rutting as a result of not using an appropriate BMP can be considered a “disch arge of dredge material”). Similarly, the use of a timber or rail car bridge that extends from bank to bank with no stream impacts is not regulated by the ACOE. The use of timber mats, stone, and log corduroy is considered “fill material” by the ACOE under the MA GPs, and must be calculated to determine overall impacts. Maintenance, including emergency reconstruction of currently serviceable structures, is exempt from ACOE jurisdiction and does not require formal permitting. Maintenance do es not include any modification that changes the character, scope, or size of the original fill design. Emergency reconstruction must occur within a reasonable period of time after damage occurs to qualify for this exemption. New culvert installation or existing culvert replacements may require permitting with local Conservation Commissions under the MAWPA, and may also require permitting with the ACOE under Section 404 of the Clean Water Act or Section 10 of the Rivers and Harbors Act of 1899, and the MassDEP under Section 401 of the Clean Water Act. Stream and wetland crossings (including culvert installations) that involve the discharge of dredge and fill material may be conducted under SV if the following criteria are met. • The use of construction mats of any area can be used to conduct activities that were previously authorized, authorized under Self-Verification, or not subject to regulation. Other temporary or permanent fill and associated secondary impacts must meet the SV limits. • Authorized construction mats must be removed immediately upon work completion, and the wetlands must be restored per the General Conditions. Appendix C C-12 Eversource Best Management Practices Manual –January 2022 The project has no potential for an effect on a historic property within the permit area or any known historic property that may occur outside the permit area. • Any in-water work controls that encroach upon more than 25 percent of the stream width are limited to a Time of Year (TOY) restriction in consideration of spawning, breeding and migration to maintain upstream fish passage. Activities within streams proposed during the TOY restrictions are generally ineligible for SV authorization. • The work does not result in direct or secondary impacts to Special Aquatic Sites. • No work occurs in Navigable Waters (waters subject to the ebb and flow of the tide and, in Massachusetts, the non-tidal consist of the Merrimack River, Connecticut River, and Charles River to the Watertown Dam). • Span streams or size culverts or pipe arches such th at they are at least 1.2 times the bankfull width. Spans are strongly preferred as they avoid or minimize disruption to the streambed and avoid entire streambed reconstruction and maintenance inside the culvert or pipe arch, which may be difficult in smaller structures. Footings and abutments for spans and scour protection should be landward of 1.2 times bankfull width. • Embed culverts or pipe arches below the grade of the streambed. This is not required when ledge/bedrock prevents embedment, in which case spans are required. The following depths are recommended to prevent streambed washout, and ensure compliance and long-term success: o ≥ 2 feet for box culverts and pipe arches, or o ≥ 2 feet and at least 25% for round pipe culverts. • Match the culvert gradient (slope) with the stream channel profile. • Construct crossings with a natural bottom substrate within the structure matching the characteristics of the substrate in the natural stream channel and the banks (mobility, slope, stability, confinement, grain and rock size) at the time of construction and over time as the structure has had the opportunity to pass substantial high flow events. • Construct crossings with appropriate bed forms and streambed characteristics so that water depths and velocities are comparable to those found in the natural channel at a variety of flows at the time of construction and over time. In order to provide appropriate water depths and velocities at a variety of flows and especially low flows, it is usually necessary to reconstruct the streambed (sometimes including a low flow channel) or replicate or preserve the natural channel within the structure. Otherwise, the width of the structure needed to accommodate higher flows will create conditions that are too shallow at low flows. Flows could go subsurface within the structure if only large material is used without smaller material filling the voids. • Openness, which is the is the cross-sectional area of a structure opening divided by its crossing length when measured in consistent units, is > 0.82 feet (0.25 meters). Banks on each side of the stream inside the crossing matching the horizontal profile of the existing stream and banks outside the crossing are recommended. To prevent failure, all constructed banks should have a height to width ratio of no greater than 1:1.5 (vertical:horizontal) unless the stream is naturally incised. Tie these banks into the up and downstream banks and configure them to be stable during expected high flows. Appendix C C-13 Eversource Best Management Practices Manual –January 2022 • The project is not located within a vernal pool depression, or vernal pool envelope, and does not individually or cumulatively impact greater than 25% of the vernal pool critical terrestrial habitat. It is feasible for some temporary impacts associated with the use of construction mats in previously disturbed ROWs to occur within the vernal pool envelope or critical terrestrial habitat if a Vegetation Management Plan demonstrates avoidance, minimization and mitigation impacts to aquatic resources. • Culvert extensions do not qualify for SV. • Culvert projects using slip lining do not qualify for SV, either as new work or maintenance activities. • No open trench excavation in flowing waters. No work in riffles and pools. • The project does not entail stream relocation. • Work is not conducted within riffles or pools. • Normal flows within the stream boundary’s confines must be maintained, i.e., temporary flume pipes, culverts, cofferdams, etc. • Water diversions (i.e., bypass pumping or water withdrawals) may be used immediately up and downstream of the work footprint. • The project is (a) not located in the designated main stem of, or within 0.25 miles up or downstream of the designated main stem of, or in tributaries within 0.25 miles of the designated main stem of a National Wild and Scenic River System; (b) not in “bordering or contiguous wetlands” that are adjacent to the designated main stem of a National Wild and Scenic River; or (c) does not have the potential to alter flows within a river within the National Wild and Scenic River System. • The project is not located within areas containing USFWS or National Marine Fisheries Service (NMFS)-listed species or critical habitat. The project is not “likely to adversely affect” listed species or habitat per the federal Endangered Species Act (ESA) or result in a “take” of any federally-listed threatened or endangered species of fish or wildlife. • The project does not impinge upon the value of any National Wildlife Refuge, National Forest, National Marine Sanctuary, or any other area administered by the U.S. Fish and Wildlife Service, U.S. Forest Service or National Park Service. • The project is not located on ACOE properties and ACOE-controlled easements. • The project does not propose temporary or permanent modification or use of a federal project beyond minor modifications required for normal operation and maintenance. • The project minimizes use of heavy construction equipment, and, where required, either has low ground pressure (typically less than 3 psi) or it must be placed on construction mats. • Construction mats must be placed in the wetland from the upland or from equipment positioned on swamp mats if working within a wetland. • Temporary fill must be stabilized. Unconfined, authorized temporary fill must consist of clean material that minimizes impacts to water quality. Temporary fill placed during the growing season must be removed before the beginning of the next growing season. If temporary fill is placed during the non -growing season, it may remain throughout the following growing season but must be removed before the beginning of the next growing season. Appendix C C-14 Eversource Best Management Practices Manual –January 2022 • Appropriate erosion, sedimentation and turbidity controls are used and maintained during construction. • Appropriate measures must be taken to minimize flooding to the maximum extent practicable. Wetland and stream crossings may be authorized under PCN if the following criteria are met: • The work results in less than one acre of impacts to inland, non -tidal, wetlands or waters of the United States. Stream and wetland crossings that cannot meet SV or PCN criteria may require review under an IP. The ACOE should be consulted before assuming an IP will be required, as exceptions can be made under certain circumstances. C.8 Temporary Stream Crossings C.8.1 U.S. Army Corps of Engineers See Section C.7 for general ACOE permitting requirements for stream crossings. To qualify for SV, temporary stream crossings (typically culverts) that are not spans must be designed in accordance with below. 1) Installed outside of the TOY restrictions and must be removed before the beginning of the TOY restriction of that same season. Temporary crossings that must remain into the TOY restriction will require PCN review. 2) Impacts to the streambed or banks require restoration to their original condition (see “Stream Simulation: An Ecological Approach to Providing Passage for Aquatic Organisms at Road-Stream Crossings,” for stream simulation restoration methods). Use geotextile fabric or other appropriate bedding for stream beds and approaches where practicable to ensure restoration to the original grade. The requirements in GCs 17, 18 and 19 are particularly relevant. 3) Avoid excavating the stream or embedding crossings. 4) For Culverts: a. The water height should be no higher than the top of the culvert’s inlet and the culvert is large enough to pass debris. b. Install energy dissipating devices downstream if necessary to prevent scour. c. The TOY restrictions in GC 18 and the restrictions in GC 17(f) are particularly relevant. 5) Removed upon the completion of work. Impacts to the streambed or banks requires restoration to their original condition using stream simulation methods. In-kind repair, replacement and maintenance of currently serviceable, authorized fills are eligible for SV. However, the conditions of the original authorization apply, and minor deviations in fill design are allowed. In-kind repair and maintenance of culverts that includes an expansion or change in use requires PCN. Replacement of non-serviceable fills, including an expansion or change in use, also requires PCN. In-kind replacement using the same materials is exempt from Section 404 of the Clean Water Act, and does not require permitting with the ACOE. The ACOE, however, should be consulted before assuming an activity is exempt from their jurisdiction. APPENDIX D D-1 FRAC-OUT PLAN Horizontal directional drilling (HDD) for subsurface utility installations is considered to be the most effective and least environmentally damaging technique when compared to traditional mechanical dredging and trenching. This method ensures the placement of the pipeline at the target burial depth with no wetland or water body disturbance. HDD installation is the preferred method for crossing sensitive resources–the alternative is open cut trenching. The HDD procedure uses bentonite slurry, a fine clay material as a drilling lubricant. Directional drilling has the small potential to release bentonite slurry into the surface environment through frac-outs. This term describes the situation caused when th e drilling head and its accompanying inert clay lubricant slurry, hits a subterranean fractured substrate. When the pressurized lubricant slurry reaches the fracture it can follow the fracture up or otherwise force itself to the surface or into the water if drilling is occurring under a waterbody. If a "frac-out” occurs under these water features, the potential exists for the inert clay (a non - toxic bentonite-based substance) to be released into the water column. In large quantities, the release of drilling mud into a waterbody could affect fisheries or other aquatic organisms by settling and temporarily inundating the habitats used by these species. Properly monitoring the slurry pressures and amounts significantly decreases risk of significant quantities o f drilling fluid being released into the environment. Frac-out is most likely to occur near the bore entry and exit points where the drill head is shallow. Should a frac-out occur during HDD operations, the following measures will be taken. • Temporarily suspend forward drilling progress. • Monitor frac-out for 4 hours to determine if the drilling mud congeals. (Bentonite will usually harden, effectively sealing the frac-out location.) • If drilling mud congeals, take no other action that would potentially suspend sediments in the water column. • If drilling mud does not congeal, erect appropriate isolation/containment measures (i.e. turbidity curtains and/or underwater boom and curtain). • If the fracture becomes excessively large, a spill response team would be called in to contain and clean up excess drilling mud in the water. Phone numbers of spill response teams in the area will be on site. • Following containment, evaluate the current drilling profile (i.e. drill pressures, pump volume rates, drilling mud consistency) to identify means to prevent further frac-out events. • If the fracture is mitigated and controlled, forward progress of the drilling may resume. www.tighebond.com Project 7211940 APPENDIX M MASSACHUSETTS DEP STORMWATER CHECKLIST 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 1 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report A. Introduction Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key. A Stormwater Report must be submitted with the Notice of Intent permit application to document compliance with the Stormwater Management Standards. The following checklist is NOT a substitute for the Stormwater Report (which should provide more substantive and detailed information) but is offered here as a tool to help the applicant organize their Stormwater Management documentation for their Report and for the reviewer to assess this information in a consistent format. As noted in the Checklist, the Stormwater Report must contain the engineering computations and supporting information set forth in Volume 3 of the Massachusetts Stormwater Handbook. The Stormwater Report must be prepared and certified by a Registered Professional Engineer (RPE) licensed in the Commonwealth. The Stormwater Report must include: • The Stormwater Checklist completed and stamped by a Registered Professional Engineer (see page 2) that certifies that the Stormwater Report contains all required submittals.1 This Checklist is to be used as the cover for the completed Stormwater Report. • Applicant/Project Name • Project Address • Name of Firm and Registered Professional Engineer that prepared the Report • Long-Term Pollution Prevention Plan required by Standards 4-6 • Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan required by Standard 82 • Operation and Maintenance Plan required by Standard 9 In addition to all plans and supporting information, the Stormwater Report must include a brief narrative describing stormwater management practices, including environmentally sensitive site design and LID techniques, along with a diagram depicting runoff through the proposed BMP treatment train. Plans are required to show existing and proposed conditions, identify all wetland resource areas, NRCS soil types, critical areas, Land Uses with Higher Potential Pollutant Loads (LUHPPL), and any areas on the site where infiltration rate is greater than 2.4 inches per hour. The Plans shall identify the drainage areas for both existing and proposed conditions at a scale that enables verification of supporting calculations. As noted in the Checklist, the Stormwater Management Report shall document compliance with each of the Stormwater Management Standards as provided in the Massachusetts Stormwater Handbook. The soils evaluation and calculations shall be done using the methodologies set forth in Volume 3 of the Massachusetts Stormwater Handbook. To ensure that the Stormwater Report is complete, applicants are required to fill in the Stormwater Report Checklist by checking the box to indicate that the specified information has been included in the Stormwater Report. If any of the information specified in the checklist has not been submitted, the applicant must provide an explanation. The completed Stormwater Report Checklist and Certification must be submitted with the Stormwater Report. 1 The Stormwater Report may also include the Illicit Discharge Compliance Statement required by Standard 10. If not included in the Stormwater Report, the Illicit Discharge Compliance Statement must be submitted prior to the discharge of stormwater runoff to the post-construction best management practices. 2 For some complex projects, it may not be possible to include the Construction Period Erosion and Sedimentation Control Plan i n the Stormwater Report. In that event, the issuing authority has the discretion to issue an Order of Conditions that approves the project and includes a condition requiring the proponent to submit the Construction Period Erosion and Sedimentation Control Plan before commencing any land disturbance activity on the site. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 2 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report B. Stormwater Checklist and Certification The following checklist is intended to serve as a guide for applicants as to the elements that ordinarily need to be addressed in a complete Stormwater Report. The checklist is also intended to provide conservation commissions and other reviewing authorities with a summary of the components necessary for a comprehensive Stormwater Report that addresses the ten Stormwater Standards. Note: Because stormwater requirements vary from project to project, it is possible that a complete Stormwater Report may not include information on some of the subjects specified in the Checklist. If it is determined that a specific item does not apply to the project under review, please note that the item is not applicable (N.A.) and provide the reasons for that determination. A complete checklist must include the Certification set forth below signed by the Registered Professional Engineer who prepared the Stormwater Report. Registered Professional Engineer’s Certification I have reviewed the Stormwater Report, including the soil evaluation, computations, Long -term Pollution Prevention Plan, the Construction Period Erosion and Sedimentation Control Plan (if included), the Long- term Post-Construction Operation and Maintenance Plan, the Illicit Discharge Compliance Statement (if included) and the plans showing the stormwater management system, and have determined that they have been prepared in accordance with the requirements of the Stormwater Management Standards as further elaborated by the Massachusetts Stormwater Handbook. I have also determined that the information presented in the Stormwater Checklist is accurate and that the information presented in the Stormwater Report accurately reflects conditions at the site as of the date of this permit application. Registered Professional Engineer Block and Signature Signature and Date Checklist Project Type: Is the application for new development, redevelopment, or a mix of new and redevelopment? New development Redevelopment Mix of New Development and Redevelopment 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 3 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) LID Measures: Stormwater Standards require LID measures to be considered. Document what environmentally sensitive design and LID Techniques were considered during the planning and design of the project: No disturbance to any Wetland Resource Areas Site Design Practices (e.g. clustered development, reduced frontage setbacks) Reduced Impervious Area (Redevelopment Only) Minimizing disturbance to existing trees and shrubs LID Site Design Credit Requested: Credit 1 Credit 2 Credit 3 Use of “country drainage” versus curb and gutter conveyance and pipe Bioretention Cells (includes Rain Gardens) Constructed Stormwater Wetlands (includes Gravel Wetlands designs) Treebox Filter Water Quality Swale Grass Channel Green Roof Other (describe): Infiltration basin sized to infiltrate more volume than required, minimize pavement footprint, expand frontage landscape screening Standard 1: No New Untreated Discharges No new untreated discharges Outlets have been designed so there is no erosion or scour to wetlands and waters of the Commonwealth Supporting calculations specified in Volume 3 of the Massachusetts Stormwater Handbook included. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 4 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 2: Peak Rate Attenuation Standard 2 waiver requested because the project is located in land subject to coastal storm flowage and stormwater discharge is to a wetland subject to coastal flooding. Evaluation provided to determine whether off-site flooding increases during the 100-year 24-hour storm. Calculations provided to show that post-development peak discharge rates do not exceed pre- development rates for the 2-year and 10-year 24-hour storms. If evaluation shows that off-site flooding increases during the 100-year 24-hour storm, calculations are also provided to show that post-development peak discharge rates do not exceed pre-development rates for the 100-year 24- hour storm. Standard 3: Recharge Soil Analysis provided. Required Recharge Volume calculation provided. Required Recharge volume reduced through use of the LID site Design Credits. Sizing the infiltration, BMPs is based on the following method: Check the method used. Static Simple Dynamic Dynamic Field1 Runoff from all impervious areas at the site discharging to the infiltration BMP. Runoff from all impervious areas at the site is not discharging to the infiltration BMP and calculations are provided showing that the drainage area contributing runoff to the infiltration BMPs is sufficient to generate the required recharge volume. Recharge BMPs have been sized to infiltrate the Required Recharge Volume. Recharge BMPs have been sized to infiltrate the Required Recharge Vo lume only to the maximum extent practicable for the following reason: Site is comprised solely of C and D soils and/or bedrock at the land surface M.G.L. c. 21E sites pursuant to 310 CMR 40.0000 Solid Waste Landfill pursuant to 310 CMR 19.000 Project is otherwise subject to Stormwater Management Standards only to the maximum extent practicable. Calculations showing that the infiltration BMPs will drain in 72 hours are provided. Property includes a M.G.L. c. 21E site or a solid waste landfill and a mounding analysis is included. 1 80% TSS removal is required prior to discharge to infiltration BMP if Dynamic Field method is used. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 5 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 3: Recharge (continued) The infiltration BMP is used to attenuate peak flows during storms greater than or equal to the 10- year 24-hour storm and separation to seasonal high groundwater is less than 4 feet and a mounding analysis is provided. Documentation is provided showing that infiltration BMPs do not adversely impact nearby wetland resource areas. Standard 4: Water Quality The Long-Term Pollution Prevention Plan typically includes the following: • Good housekeeping practices; • Provisions for storing materials and waste products inside or under cover; • Vehicle washing controls; • Requirements for routine inspections and maintenance of stormwater BMPs; • Spill prevention and response plans; • Provisions for maintenance of lawns, gardens, and other landscaped areas; • Requirements for storage and use of fertilizers, herbicides, and pesticides; • Pet waste management provisions; • Provisions for operation and management of septic systems; • Provisions for solid waste management; • Snow disposal and plowing plans relative to Wetland Resource Areas; • Winter Road Salt and/or Sand Use and Storage restrictions; • Street sweeping schedules; • Provisions for prevention of illicit discharges to the stormw ater management system; • Documentation that Stormwater BMPs are designed to provide for shutdown and containment in the event of a spill or discharges to or near critical areas or from LUHPPL; • Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan; • List of Emergency contacts for implementing Long-Term Pollution Prevention Plan. A Long-Term Pollution Prevention Plan is attached to Stormwater Report and is included as an attachment to the Wetlands Notice of Intent. Treatment BMPs subject to the 44% TSS removal pretreatment requirement and the one inch rule for calculating the water quality volume are included, and discharge: is within the Zone II or Interim Wellhead Protection Area is near or to other critical areas is within soils with a rapid infiltration rate (greater than 2.4 inches per hour) involves runoff from land uses with higher potential pollutant loads. The Required Water Quality Volume is reduced through use of the LID site Design Credits. Calculations documenting that the treatment train meets the 80% TSS removal requirem ent and, if applicable, the 44% TSS removal pretreatment requirement, are provided. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 6 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 4: Water Quality (continued) The BMP is sized (and calculations provided) based on: The ½” or 1” Water Quality Volume or The equivalent flow rate associated with the Water Quality Volume and documentation is provided showing that the BMP treats the required water quality volume. The applicant proposes to use proprietary BMPs, and documentation supporting use of proprietary BMP and proposed TSS removal rate is provided. This documentation may be in the form of the propriety BMP checklist found in Volume 2, Chapter 4 of the Massachusetts Stormwater Handbo ok and submitting copies of the TARP Report, STEP Report, and/or other third party studies verifying performance of the proprietary BMPs. A TMDL exists that indicates a need to reduce pollutants other than TSS and documentation showing that the BMPs selected are consistent with the TMDL is provided. Standard 5: Land Uses With Higher Potential Pollutant Loads (LUHPPLs) The NPDES Multi-Sector General Permit covers the land use and the Stormwater Pollution Prevention Plan (SWPPP) has been included with the Stormwater Report. The NPDES Multi-Sector General Permit covers the land use and the SWPPP will be submitted prior to the discharge of stormwater to the post-construction stormwater BMPs. The NPDES Multi-Sector General Permit does not cover the land use. LUHPPLs are located at the site and industry specific source control and pollution prevention measures have been proposed to reduce or eliminate the exposure of LUHPPLs to rain, snow, snow melt and runoff, and been included in the long term Pollution Prevention Plan. All exposure has been eliminated. All exposure has not been eliminated and all BMPs selected are on MassDEP LUHPPL list. The LUHPPL has the potential to generate runoff with moderate to higher concentrations of oil and grease (e.g. all parking lots with >1000 vehicle trips per day) and the treatment train includes an oil grit separator, a filtering bioretention area, a sand filter or equivalent. Standard 6: Critical Areas The discharge is near or to a critical area and the treatment train includes only BMPs that MassDEP has approved for stormwater discharges to or near that particular class of critical area. Critical areas and BMPs are identified in the Stormwater Report. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 7 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 7: Redevelopments and Other Projects Subject to the Standards only to t he maximum extent practicable The project is subject to the Stormwater Management Standards only to the maximum Extent Practicable as a: Limited Project Small Residential Projects: 5-9 single family houses or 5-9 units in a multi-family development provided there is no discharge that may potentially affect a critical area. Small Residential Projects: 2-4 single family houses or 2-4 units in a multi-family development with a discharge to a critical area Marina and/or boatyard provided the hull painting, service and maintenance areas are protected from exposure to rain, snow, snow melt and runoff Bike Path and/or Foot Path Redevelopment Project Redevelopment portion of mix of new and redevelopment. Certain standards are not fully met (Standard No. 1, 8, 9, and 10 must always be fully met) and an explanation of why these standards are not met is contained in the Stormwater Report. The project involves redevelopment and a description of all measures that have been taken to improve existing conditions is provided in the Stormwater Report. The redevelopment checklist found in Volume 2 Chapter 3 of the Massachusetts Stormwater Handbook may be used to document that the proposed stormwater management system (a) complies with Standards 2, 3 and the pretreatment and structural BMP requirements of Standards 4-6 to the maximum extent practicable and (b) improves existing conditions. Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan must include the following information: • Narrative; • Construction Period Operation and Maintenance Plan; • Names of Persons or Entity Responsible for Plan Compliance; • Construction Period Pollution Prevention Measures; • Erosion and Sedimentation Control Plan Drawings; • Detail drawings and specifications for erosion control BMPs, including sizing calculations; • Vegetation Planning; • Site Development Plan; • Construction Sequencing Plan; • Sequencing of Erosion and Sedimentation Controls; • Operation and Maintenance of Erosion and Sedimentation Controls; • Inspection Schedule; • Maintenance Schedule; • Inspection and Maintenance Log Form. A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan containing the information set forth above has been included in the Stormwater Report. 484 Willow Mass DEP Stormwater Checklist.doc • 04/01/08 Stormwater Report Checklist • Page 8 of 8 Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program Checklist for Stormwater Report Checklist (continued) Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control (continued) The project is highly complex and information is included in the Stormwater Report that explains why it is not possible to submit the Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan with the application. A Construction Period Pollution Prevention and Erosion and Sedimentation Control has not been included in the Stormwater Report but will be submitted before land disturbance begins. The project is not covered by a NPDES Construction General Permit. The project is covered by a NPDES Construction General Permit and a copy of the SWPPP is in the Stormwater Report. The project is covered by a NPDES Construction General Permit but no SWPPP been submitted. The SWPPP will be submitted BEFORE land disturbance begins. Standard 9: Operation and Maintenance Plan The Post Construction Operation and Maintenance Plan is included in the Stormwater Re port and includes the following information: Name of the stormwater management system owners; Party responsible for operation and maintenance; Schedule for implementation of routine and non-routine maintenance tasks; Plan showing the location of all stormwater BMPs maintenance access areas; Description and delineation of public safety features; Estimated operation and maintenance budget; and Operation and Maintenance Log Form. The responsible party is not the owner of the parcel where the BMP is located and the Stormwater Report includes the following submissions: A copy of the legal instrument (deed, homeowner’s association, utility trust or other legal entity) that establishes the terms of and legal responsibility for the operation and maintenance of the project site stormwater BMPs; A plan and easement deed that allows site access for the legal entity to operate and maintain BMP functions. Standard 10: Prohibition of Illicit Discharges The Long-Term Pollution Prevention Plan includes measures to prevent illicit discharges; An Illicit Discharge Compliance Statement is attached; NO Illicit Discharge Compliance Statement is attached but will be submitted prior to the discharge of any stormwater to post-construction BMPs.