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HomeMy WebLinkAbout__NOI (compiled w plans & SW Report-O&M)_Curve Hill_22108 (1) NOTICE OF INTENT Site UBR-4 – Curve Hill Road Yarmouth, MA YARMOUTH STORMWATER DESIGN AND IMPLEMENTATION PROJECT September 2024 PREPARED FOR: Jeffery Colby, P.E., DPW Director Town of Yarmouth 1146 Route 28 South Yarmouth, MA 02664 PREPARED BY: PROJECT FUNDERS: This project is a collaborative effort involving the Cape Cod Conservation District (CCCD) and the Town of Yarmouth Department of Works (DPW). Funding for this work has been provided to the Association to Preserve Cape Cod (APCC) through Massachusetts Office of Coastal Zone Management (CZM) Coastal Habitat and Water Quality Grants. Contents Cover Letter Notice of Intent Forms WPA Form 3 NOI Wetland Fee Transmittal Form Local Forms NOI Checklist Site Access Authorization Form 21 Day Waiver Abutters Notification Certified List of Abutters Notification to Abutters Affidavit of Service Project Narrative Attachments Attachment A – Locus Maps Figure 1 – USGS Topographic Map Figure 2 – Aerial Map Figure 3 – FEMA Flood Insurance Rate Map Figure 3A – FIRMette Map Figure 4 – Constraints Map Figure 5 – Soils Map Figure 6 – Environmental Justice Communities Figure 7 – Impaired Waters Attachment B – Wetland Data Forms Attachment C – Project Plans (reduce size; full-size bound separately) Attachment D – Stormwater Report Massachusetts Department of Environmental Protection eDEP Transaction Copy Here is the file you requested for your records. To retain a copy of this file you must save and/or print. Username: Transaction ID: Document: Size of File: Status of Transaction: Date and Time Created: Note: This file only includes forms that were part of your transaction as of the date and time indicated above. If you need a more current copy of your transaction, return to eDEP and select to “Download a Copy” from the Current Submittals page. 1739229 9/18/2024:10:46:13 AM 274.96K 90ROUTE6AEDEP WPA Form 3 - NOI In Process a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information 1. Project Location: a. Street Address CURVE HILL RD b. City/Town YARMOUTH c. Zip Code 02664 d. Latitude 41.68577N e. Longitude 70.16855W f. Map/Plat #101 g.Parcel/Lot #196 2. Applicant: Individual Organization a. First Name JEFFREY b.Last Name COLBY c. Organization TOWN OF YARMOUTH d. Mailing Address 1146 ROUTE 28 e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664 h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us 3.Property Owner: more than one owner a. First Name JEFFERY b. Last Name COLBY c. Organization TOWN OF YARMOUTH d. Mailing Address 1146 ROUTE 28 e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664 h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us 4.Representative: a. First Name GEMMA b. Last Name KITE c. Organization HORSLEY WITTEN GROUP, INC. d. Mailing Address 90 ROUTE 6A, UNIT 1 e. City/Town SANDWICH f. State MA g. Zip Code 02563 h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com 5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form): a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.00 6.General Project Description: THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVE HILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THIS INITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATION PROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATER INFRASTRUCTURE PRACTICES. 7a.Project Type: 1. Single Family Home 2. Residential Subdivision 3.Limited Project Driveway Crossing 4.Commercial/Industrial 5.Dock/Pier 6.Utilities 7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry) 9.Transportation 10.Other 7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)? 1.Yes No If yes, describe which limited project applies to this project: 2. Limited Project 8.Property recorded at the Registry of Deeds for: a.County:b.Certificate:c.Book:d.Page: BARNSTABLE 1496 0168 B. Buffer Zone & Resource Area Impacts (temporary & permanent) 1.Buffer Zone & Resource Area Impacts (temporary & permanent): This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area. 2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas) Resource Area Size of Proposed Alteration Proposed Replacement (if any) a.Bank 1. linear feet 2. linear feet b.Bordering Vegetated Wetland 1. square feet 2. square feet c.Land under Waterbodies and Waterways 1. Square feet 2. square feet 3. cubic yards dredged d.Bordering Land Subject to Flooding 1. square feet 2. square feet 3. cubic feet of flood storage lost 4. cubic feet replaced e.Isolated Land Subject to Flooding 1. square feet 2. cubic feet of flood storage lost 3. cubic feet replaced f.Riverfront Area 1. Name of Waterway (if any) 2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only 100 ft. ­ New agricultural projects only 200 ft. ­ All other projects 3. Total area of Riverfront Area on the site of the proposed project square feet 4. Proposed Alteration of the Riverfront Area: a. total square feet b. square feet within 100 ft.c. square feet between 100 ft. and 200 ft. 5. Has an alternatives analysis been done and is it attached to this NOI?Yes No 6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No 3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35) Resource Area Size of Proposed Alteration Proposed Replacement (if any) a.Designated Port Areas Indicate size under Land under the ocean below, b.Land Under the Ocean 1. square feet 2. cubic yards dredged c.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, below d.Coastal Beaches 1. square feet 2. cubic yards beach nourishment e.Coastal Dunes 1. square feet 2. cubic yards dune nourishment f.Coastal Banks 1. linear feet g.Rocky Intertidal Shores 1. square feet h.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea. i.Land Under Salt Ponds 1. square feet 2. cubic yards dredged j.Land Containing Shellfish 1. square feet k.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged l.Land Subject to Coastal Storm Flowage 1. square feet 4.Restoration/Enhancement  Restoration/Replacement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please entered the additional amount here. a. square feet of BVW b. square feet of Salt Marsh 5.Projects Involves Stream Crossings  Project Involves Streams Crossings If the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings. a. number of new stream crossings b. number of replacement stream crossings C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review 1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program (NHESP)? a.Yes No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 1 Rabbit Hill Road Westborough, MA 01581 b. Date of map:FROM MAP VIEWER If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18).... c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply) 1. Percentage/acreage of property to be altered: (a) within Wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. Assessor's Map or right­of­way plan of site 3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** a.Project description (including description of impacts outside of wetland resource area & buffer zone) b. Photographs representative of the site c. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­ review/mass­endangered­species­act­mesa/mesa­fee­schedule.html ) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: d.Vegetation cover type map of site e.Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the following 1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­ species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3.Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. *Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review... 2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run? a. Not applicable ­ project is in inland resource area only b.Yes No If yes, include proof of mailing or hand delivery of NOI to either: South Shore ­ Cohasset to Rhode Island, and the Cape & Islands: Division of Marine Fisheries ­  Southeast Marine Fisheries Station Attn: Environmental Reviewer 836 S. Rodney French Blvd  New Bedford, MA 02744 North Shore ­ Hull to New Hampshire: Division of Marine Fisheries ­  North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930 If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office. 3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? a.Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or DEP Website for ACEC locations). Note: electronic filers click on Website. b. ACEC Name 4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? a.Yes No 5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)? a.Yes No 6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 1 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description: THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVE HILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THIS INITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATION PROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATER INFRASTRUCTURE PRACTICES. 7a.Project Type: 1. Single Family Home 2. Residential Subdivision 3.Limited Project Driveway Crossing 4.Commercial/Industrial 5.Dock/Pier 6.Utilities 7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry) 9.Transportation 10.Other 7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310 CMR 10.53 (inland)? 1.Yes No If yes, describe which limited project applies to this project: 2. Limited Project 8.Property recorded at the Registry of Deeds for: a.County:b.Certificate:c.Book:d.Page: BARNSTABLE 1496 0168 B. Buffer Zone & Resource Area Impacts (temporary & permanent) 1.Buffer Zone & Resource Area Impacts (temporary & permanent): This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland, Inland Bank, or Coastal Resource Area. 2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas) Resource Area Size of Proposed Alteration Proposed Replacement (if any) a.Bank 1. linear feet 2. linear feet b.Bordering Vegetated Wetland 1. square feet 2. square feet c.Land under Waterbodies and Waterways 1. Square feet 2. square feet 3. cubic yards dredged d.Bordering Land Subject to Flooding 1. square feet 2. square feet 3. cubic feet of flood storage lost 4. cubic feet replaced e.Isolated Land Subject to Flooding 1. square feet 2. cubic feet of flood storage lost 3. cubic feet replaced f.Riverfront Area 1. Name of Waterway (if any) 2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only 100 ft. ­ New agricultural projects only 200 ft. ­ All other projects 3. Total area of Riverfront Area on the site of the proposed project square feet 4. Proposed Alteration of the Riverfront Area: a. total square feet b. square feet within 100 ft.c. square feet between 100 ft. and 200 ft. 5. Has an alternatives analysis been done and is it attached to this NOI?Yes No 6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No 3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35) Resource Area Size of Proposed Alteration Proposed Replacement (if any) a.Designated Port Areas Indicate size under Land under the ocean below, b.Land Under the Ocean 1. square feet 2. cubic yards dredged c.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, below d.Coastal Beaches 1. square feet 2. cubic yards beach nourishment e.Coastal Dunes 1. square feet 2. cubic yards dune nourishment f.Coastal Banks 1. linear feet g.Rocky Intertidal Shores 1. square feet h.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea. i.Land Under Salt Ponds 1. square feet 2. cubic yards dredged j.Land Containing Shellfish 1. square feet k.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged l.Land Subject to Coastal Storm Flowage 1. square feet 4.Restoration/Enhancement  Restoration/Replacement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please entered the additional amount here. a. square feet of BVW b. square feet of Salt Marsh 5.Projects Involves Stream Crossings  Project Involves Streams Crossings If the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings. a. number of new stream crossings b. number of replacement stream crossings C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review 1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program (NHESP)? a.Yes No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 1 Rabbit Hill Road Westborough, MA 01581 b. Date of map:FROM MAP VIEWER If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18).... c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply) 1. Percentage/acreage of property to be altered: (a) within Wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. Assessor's Map or right­of­way plan of site 3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** a.Project description (including description of impacts outside of wetland resource area & buffer zone) b. Photographs representative of the site c. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­ review/mass­endangered­species­act­mesa/mesa­fee­schedule.html ) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: d.Vegetation cover type map of site e.Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the following 1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­ species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3.Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. *Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review... 2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run? a. Not applicable ­ project is in inland resource area only b.Yes No If yes, include proof of mailing or hand delivery of NOI to either: South Shore ­ Cohasset to Rhode Island, and the Cape & Islands: Division of Marine Fisheries ­  Southeast Marine Fisheries Station Attn: Environmental Reviewer 836 S. Rodney French Blvd  New Bedford, MA 02744 North Shore ­ Hull to New Hampshire: Division of Marine Fisheries ­  North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930 If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office. 3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? a.Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or DEP Website for ACEC locations). Note: electronic filers click on Website. b. ACEC Name 4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? a.Yes No 5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)? a.Yes No 6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 2 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description:THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVEHILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THISINITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATIONPROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATERINFRASTRUCTURE PRACTICES.7a.Project Type:1. Single Family Home 2. Residential Subdivision3.Limited Project Driveway Crossing 4.Commercial/Industrial5.Dock/Pier 6.Utilities7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry)9.Transportation 10.Other7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310CMR 10.53 (inland)?1.Yes No If yes, describe which limited project applies to this project:2. Limited Project8.Property recorded at the Registry of Deeds for:a.County:b.Certificate:c.Book:d.Page:BARNSTABLE 1496 0168B. Buffer Zone & Resource Area Impacts (temporary & permanent)1.Buffer Zone & Resource Area Impacts (temporary & permanent):This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland,Inland Bank, or Coastal Resource Area.2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Bank 1. linear feet 2. linear feetb.Bordering Vegetated Wetland 1. square feet 2. square feetc.Land under Waterbodies and Waterways 1. Square feet 2. square feet3. cubic yards dredgedd.Bordering Land Subject to Flooding 1. square feet 2. square feet3. cubic feet of flood storage lost 4. cubic feet replacede.Isolated Land Subject to Flooding 1. square feet2. cubic feet of flood storage lost 3. cubic feet replaced f.Riverfront Area 1. Name of Waterway (if any) 2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only 100 ft. ­ New agricultural projects only 200 ft. ­ All other projects 3. Total area of Riverfront Area on the site of the proposed project square feet 4. Proposed Alteration of the Riverfront Area: a. total square feet b. square feet within 100 ft.c. square feet between 100 ft. and 200 ft. 5. Has an alternatives analysis been done and is it attached to this NOI?Yes No 6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No 3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35) Resource Area Size of Proposed Alteration Proposed Replacement (if any) a.Designated Port Areas Indicate size under Land under the ocean below, b.Land Under the Ocean 1. square feet 2. cubic yards dredged c.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, below d.Coastal Beaches 1. square feet 2. cubic yards beach nourishment e.Coastal Dunes 1. square feet 2. cubic yards dune nourishment f.Coastal Banks 1. linear feet g.Rocky Intertidal Shores 1. square feet h.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea. i.Land Under Salt Ponds 1. square feet 2. cubic yards dredged j.Land Containing Shellfish 1. square feet k.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland Land Under Waterbodies and Waterways, above 1. cubic yards dredged l.Land Subject to Coastal Storm Flowage 1. square feet 4.Restoration/Enhancement  Restoration/Replacement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please entered the additional amount here. a. square feet of BVW b. square feet of Salt Marsh 5.Projects Involves Stream Crossings  Project Involves Streams Crossings If the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings. a. number of new stream crossings b. number of replacement stream crossings C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review 1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program (NHESP)? a.Yes No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 1 Rabbit Hill Road Westborough, MA 01581 b. Date of map:FROM MAP VIEWER If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18).... c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply) 1. Percentage/acreage of property to be altered: (a) within Wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. Assessor's Map or right­of­way plan of site 3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** a.Project description (including description of impacts outside of wetland resource area & buffer zone) b. Photographs representative of the site c. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­ review/mass­endangered­species­act­mesa/mesa­fee­schedule.html ) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: d.Vegetation cover type map of site e.Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the following 1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­ species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3.Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. *Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review... 2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run? a. Not applicable ­ project is in inland resource area only b.Yes No If yes, include proof of mailing or hand delivery of NOI to either: South Shore ­ Cohasset to Rhode Island, and the Cape & Islands: Division of Marine Fisheries ­  Southeast Marine Fisheries Station Attn: Environmental Reviewer 836 S. Rodney French Blvd  New Bedford, MA 02744 North Shore ­ Hull to New Hampshire: Division of Marine Fisheries ­  North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930 If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office. 3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? a.Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or DEP Website for ACEC locations). Note: electronic filers click on Website. b. ACEC Name 4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? a.Yes No 5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)? a.Yes No 6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 3 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description:THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVEHILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THISINITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATIONPROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATERINFRASTRUCTURE PRACTICES.7a.Project Type:1. Single Family Home 2. Residential Subdivision3.Limited Project Driveway Crossing 4.Commercial/Industrial5.Dock/Pier 6.Utilities7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry)9.Transportation 10.Other7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310CMR 10.53 (inland)?1.Yes No If yes, describe which limited project applies to this project:2. Limited Project8.Property recorded at the Registry of Deeds for:a.County:b.Certificate:c.Book:d.Page:BARNSTABLE 1496 0168B. Buffer Zone & Resource Area Impacts (temporary & permanent)1.Buffer Zone & Resource Area Impacts (temporary & permanent):This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland,Inland Bank, or Coastal Resource Area.2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Bank 1. linear feet 2. linear feetb.Bordering Vegetated Wetland 1. square feet 2. square feetc.Land under Waterbodies and Waterways 1. Square feet 2. square feet3. cubic yards dredgedd.Bordering Land Subject to Flooding 1. square feet 2. square feet3. cubic feet of flood storage lost 4. cubic feet replacede.Isolated Land Subject to Flooding 1. square feet2. cubic feet of flood storage lost 3. cubic feet replacedf.Riverfront Area 1. Name of Waterway (if any)2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only100 ft. ­ New agricultural projects only200 ft. ­ All other projects3. Total area of Riverfront Area on the site of the proposed project square feet4. Proposed Alteration of the Riverfront Area:a. total square feet b. square feet within 100 ft.c. square feet between 100 ft.and 200 ft.5. Has an alternatives analysis been done and is it attached to this NOI?Yes No6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Designated Port Areas Indicate size under Land under the ocean below,b.Land Under the Ocean 1. square feet2. cubic yards dredgedc.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, belowd.Coastal Beaches 1. square feet 2. cubic yards beach nourishmente.Coastal Dunes 1. square feet 2. cubic yards dune nourishmentf.Coastal Banks 1. linear feetg.Rocky Intertidal Shores 1. square feeth.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea.i.Land Under Salt Ponds 1. square feet2. cubic yards dredgedj.Land Containing Shellfish 1. square feetk.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland LandUnder Waterbodies and Waterways, above 1. cubic yards dredged l.Land Subject to Coastal Storm Flowage 1. square feet 4.Restoration/Enhancement  Restoration/Replacement If the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has been entered in Section B.2.b or B.3.h above, please entered the additional amount here. a. square feet of BVW b. square feet of Salt Marsh 5.Projects Involves Stream Crossings  Project Involves Streams Crossings If the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings. a. number of new stream crossings b. number of replacement stream crossings C. Other Applicable Standards and Requirements Streamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review 1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recent Estimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program (NHESP)? a.Yes No If yes, include proof of mailing or hand delivery of NOI to: Natural Heritage and Endangered Species Program Division of Fisheries and Wildlife 1 Rabbit Hill Road Westborough, MA 01581 b. Date of map:FROM MAP VIEWER If yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18).... c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply) 1. Percentage/acreage of property to be altered: (a) within Wetland Resource Area percentage/acreage (b) outside Resource Area percentage/acreage 2. Assessor's Map or right­of­way plan of site 3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showing existing and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work ** a.Project description (including description of impacts outside of wetland resource area & buffer zone) b. Photographs representative of the site c. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­ review/mass­endangered­species­act­mesa/mesa­fee­schedule.html ) Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: d.Vegetation cover type map of site e.Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the following 1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­ species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3.Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. *Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review... 2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run? a. Not applicable ­ project is in inland resource area only b.Yes No If yes, include proof of mailing or hand delivery of NOI to either: South Shore ­ Cohasset to Rhode Island, and the Cape & Islands: Division of Marine Fisheries ­  Southeast Marine Fisheries Station Attn: Environmental Reviewer 836 S. Rodney French Blvd  New Bedford, MA 02744 North Shore ­ Hull to New Hampshire: Division of Marine Fisheries ­  North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930 If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office. 3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? a.Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or DEP Website for ACEC locations). Note: electronic filers click on Website. b. ACEC Name 4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? a.Yes No 5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)? a.Yes No 6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 4 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description:THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVEHILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THISINITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATIONPROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATERINFRASTRUCTURE PRACTICES.7a.Project Type:1. Single Family Home 2. Residential Subdivision3.Limited Project Driveway Crossing 4.Commercial/Industrial5.Dock/Pier 6.Utilities7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry)9.Transportation 10.Other7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310CMR 10.53 (inland)?1.Yes No If yes, describe which limited project applies to this project:2. Limited Project8.Property recorded at the Registry of Deeds for:a.County:b.Certificate:c.Book:d.Page:BARNSTABLE 1496 0168B. Buffer Zone & Resource Area Impacts (temporary & permanent)1.Buffer Zone & Resource Area Impacts (temporary & permanent):This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland,Inland Bank, or Coastal Resource Area.2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Bank 1. linear feet 2. linear feetb.Bordering Vegetated Wetland 1. square feet 2. square feetc.Land under Waterbodies and Waterways 1. Square feet 2. square feet3. cubic yards dredgedd.Bordering Land Subject to Flooding 1. square feet 2. square feet3. cubic feet of flood storage lost 4. cubic feet replacede.Isolated Land Subject to Flooding 1. square feet2. cubic feet of flood storage lost 3. cubic feet replacedf.Riverfront Area 1. Name of Waterway (if any)2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only100 ft. ­ New agricultural projects only200 ft. ­ All other projects3. Total area of Riverfront Area on the site of the proposed project square feet4. Proposed Alteration of the Riverfront Area:a. total square feet b. square feet within 100 ft.c. square feet between 100 ft.and 200 ft.5. Has an alternatives analysis been done and is it attached to this NOI?Yes No6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Designated Port Areas Indicate size under Land under the ocean below,b.Land Under the Ocean 1. square feet2. cubic yards dredgedc.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, belowd.Coastal Beaches 1. square feet 2. cubic yards beach nourishmente.Coastal Dunes 1. square feet 2. cubic yards dune nourishmentf.Coastal Banks 1. linear feetg.Rocky Intertidal Shores 1. square feeth.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea.i.Land Under Salt Ponds 1. square feet2. cubic yards dredgedj.Land Containing Shellfish 1. square feetk.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland LandUnder Waterbodies and Waterways, above1. cubic yards dredgedl.Land Subject to CoastalStorm Flowage 1. square feet4.Restoration/Enhancement Restoration/ReplacementIf the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has beenentered in Section B.2.b or B.3.h above, please entered the additional amount here.a. square feet of BVW b. square feet of Salt Marsh5.Projects Involves Stream Crossings Project Involves Streams CrossingsIf the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings.a. number of new stream crossings b. number of replacement stream crossingsC. Other Applicable Standards and RequirementsStreamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recentEstimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program(NHESP)?a.Yes NoIf yes, include proof of mailing or hand delivery of NOI to:Natural Heritage and Endangered SpeciesProgramDivision of Fisheries and Wildlife1 Rabbit Hill RoadWestborough, MA 01581b. Date of map:FROM MAP VIEWERIf yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18)....c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply)1. Percentage/acreage of property to be altered:(a) within Wetland Resource Area percentage/acreage(b) outside Resource Area percentage/acreage2. Assessor's Map or right­of­way plan of site3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showingexisting and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work **a.Project description (including description of impacts outside of wetland resource area & buffer zone)b. Photographs representative of the sitec. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­review/mass­endangered­species­act­mesa/mesa­fee­schedule.html )Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above address Projects altering 10 or more acres of land, also submit: d.Vegetation cover type map of site e.Project plans showing Priority & Estimated Habitat boundaries d. OR Check One of the following 1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321 CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­ species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR 10.37 and 10.59.) 2. Separate MESA review ongoing. a. NHESP Tracking Number b. Date submitted to NHESP 3.Separate MESA review completed. Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan. *Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review... 2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run? a. Not applicable ­ project is in inland resource area only b.Yes No If yes, include proof of mailing or hand delivery of NOI to either: South Shore ­ Cohasset to Rhode Island, and the Cape & Islands: Division of Marine Fisheries ­  Southeast Marine Fisheries Station Attn: Environmental Reviewer 836 S. Rodney French Blvd  New Bedford, MA 02744 North Shore ­ Hull to New Hampshire: Division of Marine Fisheries ­  North Shore Office Attn: Environmental Reviewer 30 Emerson Avenue Gloucester, MA 01930 If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office. For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office. 3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)? a.Yes No If yes, provide name of ACEC (see instructions to WPA Form 3 or DEP Website for ACEC locations). Note: electronic filers click on Website. b. ACEC Name 4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in the Massachusetts Surface Water Quality Standards, 314 CMR 4.00? a.Yes No 5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, § 40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)? a.Yes No 6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 5 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR 10.05(6)(k)­(q) and check if: A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description:THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVEHILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THISINITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATIONPROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATERINFRASTRUCTURE PRACTICES.7a.Project Type:1. Single Family Home 2. Residential Subdivision3.Limited Project Driveway Crossing 4.Commercial/Industrial5.Dock/Pier 6.Utilities7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry)9.Transportation 10.Other7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310CMR 10.53 (inland)?1.Yes No If yes, describe which limited project applies to this project:2. Limited Project8.Property recorded at the Registry of Deeds for:a.County:b.Certificate:c.Book:d.Page:BARNSTABLE 1496 0168B. Buffer Zone & Resource Area Impacts (temporary & permanent)1.Buffer Zone & Resource Area Impacts (temporary & permanent):This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland,Inland Bank, or Coastal Resource Area.2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Bank 1. linear feet 2. linear feetb.Bordering Vegetated Wetland 1. square feet 2. square feetc.Land under Waterbodies and Waterways 1. Square feet 2. square feet3. cubic yards dredgedd.Bordering Land Subject to Flooding 1. square feet 2. square feet3. cubic feet of flood storage lost 4. cubic feet replacede.Isolated Land Subject to Flooding 1. square feet2. cubic feet of flood storage lost 3. cubic feet replacedf.Riverfront Area 1. Name of Waterway (if any)2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only100 ft. ­ New agricultural projects only200 ft. ­ All other projects3. Total area of Riverfront Area on the site of the proposed project square feet4. Proposed Alteration of the Riverfront Area:a. total square feet b. square feet within 100 ft.c. square feet between 100 ft.and 200 ft.5. Has an alternatives analysis been done and is it attached to this NOI?Yes No6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Designated Port Areas Indicate size under Land under the ocean below,b.Land Under the Ocean 1. square feet2. cubic yards dredgedc.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, belowd.Coastal Beaches 1. square feet 2. cubic yards beach nourishmente.Coastal Dunes 1. square feet 2. cubic yards dune nourishmentf.Coastal Banks 1. linear feetg.Rocky Intertidal Shores 1. square feeth.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea.i.Land Under Salt Ponds 1. square feet2. cubic yards dredgedj.Land Containing Shellfish 1. square feetk.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland LandUnder Waterbodies and Waterways, above1. cubic yards dredgedl.Land Subject to CoastalStorm Flowage 1. square feet4.Restoration/Enhancement Restoration/ReplacementIf the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has beenentered in Section B.2.b or B.3.h above, please entered the additional amount here.a. square feet of BVW b. square feet of Salt Marsh5.Projects Involves Stream Crossings Project Involves Streams CrossingsIf the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings.a. number of new stream crossings b. number of replacement stream crossingsC. Other Applicable Standards and RequirementsStreamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recentEstimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program(NHESP)?a.Yes NoIf yes, include proof of mailing or hand delivery of NOI to:Natural Heritage and Endangered SpeciesProgramDivision of Fisheries and Wildlife1 Rabbit Hill RoadWestborough, MA 01581b. Date of map:FROM MAP VIEWERIf yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18)....c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply)1. Percentage/acreage of property to be altered:(a) within Wetland Resource Area percentage/acreage(b) outside Resource Area percentage/acreage2. Assessor's Map or right­of­way plan of site3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showingexisting and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work **a.Project description (including description of impacts outside of wetland resource area & buffer zone)b. Photographs representative of the sitec. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­review/mass­endangered­species­act­mesa/mesa­fee­schedule.html )Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above addressProjects altering 10 or more acres of land, also submit:d.Vegetation cover type map of sitee.Project plans showing Priority & Estimated Habitat boundariesd. OR Check One of the following1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR10.37 and 10.59.)2. Separate MESA review ongoing.a. NHESP Tracking Numberb. Date submitted to NHESP3.Separate MESA review completed.Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan.*Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review...2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run?a. Not applicable ­ project is in inland resource area onlyb.Yes NoIf yes, include proof of mailing or hand delivery of NOI to either:South Shore ­ Cohasset to Rhode Island, and the Cape & Islands:Division of Marine Fisheries ­ Southeast Marine Fisheries StationAttn: Environmental Reviewer836 S. Rodney French Blvd New Bedford, MA 02744 North Shore ­ Hull to New Hampshire:Division of Marine Fisheries ­ North Shore OfficeAttn: Environmental Reviewer30 Emerson AvenueGloucester, MA 01930If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office.For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office.3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)?a.Yes No If yes, provide name of ACEC (see instructions to WPAForm 3 or DEP Website for ACEC locations). Note:electronic filers click on Website.b. ACEC Name4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in theMassachusetts Surface Water Quality Standards, 314 CMR 4.00?a.Yes No5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, §40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)?a.Yes No6.Is this project subject to provisions of the MassDEP Stormwater Management Standards? 1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management Handbook Vol.2, Chapter 3) 2.A portion of the site constitutes redevelopment 3.Proprietary BMPs are included in the Stormwater Management System b.No, Explain why the project is exempt: 1.Single Family Home 2.Emergency Road Repair 3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­family housing project) with no discharge to Critical Areas. D. Additional Information Applicants must include the following with this Notice of Intent (NOI). See instructions for details. Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information you submit to the Department by regular mail delivery. 1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for the Conservation Commission and the Department to locate the site. (Electronic filers may omit this item.) 2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland [BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area. 3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s). Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology. 4.List the titles and dates for all plans and other materials submitted with this NOI. a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale: SITE UBR#4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ 75% DESIGN YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10' STORMWATER MANAGEMENT REPORT ­ CURVE HILL ROAD, YARMOUTH, MA HORSLEY WITTEN GROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 6 of 8 * ELECTRONIC COPY a.Yes, Attach a copy of the Stormwater Report as required by the Stormwater Management Standards per 310 CMR10.05(6)(k)­(q) and check if:A.General Information1. Project Location:a. Street Address CURVE HILL RDb. City/Town YARMOUTH c. Zip Code 02664d. Latitude 41.68577N e. Longitude 70.16855Wf. Map/Plat #101 g.Parcel/Lot #1962. Applicant:Individual Organizationa. First Name JEFFREY b.Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j. Email Jcolby@yarmouth.ma.us3.Property Owner:more than one ownera. First Name JEFFERY b. Last Name COLBYc. Organization TOWN OF YARMOUTHd. Mailing Address 1146 ROUTE 28e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664h. Phone Number 508­398­2231 i. Fax j.Email Jcolby@yarmouth.ma.us4.Representative:a. First Name GEMMA b. Last Name KITEc. Organization HORSLEY WITTEN GROUP, INC.d. Mailing Address 90 ROUTE 6A, UNIT 1e. City/Town SANDWICH f. State MA g. Zip Code 02563h.Phone Number 508­833­6600 i.Fax j.Email Gkite@horsleywitten.com5.Total WPA Fee Paid (Automatically inserted from NOI Wetland Fee Transmittal Form):a.Total Fee Paid 0.00 b.State Fee Paid 0.00 c.City/Town Fee Paid 0.006.General Project Description:THE APPLICANT, THE TOWN OF YARMOUTH, IS PROPOSING A STORMWATER RETROFIT PROJECT AT CURVEHILL ROAD IN YARMOUTH, MA, IN PARTNERSHIP WITH THE ASSOCIATION TO PRESERVE CAPE COD . THISINITIATIVE IS PART OF A BROADER EFFORT, THE YARMOUTH STORMWATER DESIGN AND IMPLEMENTATIONPROJECT, AIMED AT ENHANCING WATER QUALITY WITHIN THE TOWN USING GREEN STORMWATERINFRASTRUCTURE PRACTICES.7a.Project Type:1. Single Family Home 2. Residential Subdivision3.Limited Project Driveway Crossing 4.Commercial/Industrial5.Dock/Pier 6.Utilities7.Coastal Engineering Structure 8.Agriculture (eg., cranberries, forestry)9.Transportation 10.Other7b.Is any portion of the proposed activity eligible to be treated as a limited project subject to 310 CMR 10.24 (coastal) or 310CMR 10.53 (inland)?1.Yes No If yes, describe which limited project applies to this project:2. Limited Project8.Property recorded at the Registry of Deeds for:a.County:b.Certificate:c.Book:d.Page:BARNSTABLE 1496 0168B. Buffer Zone & Resource Area Impacts (temporary & permanent)1.Buffer Zone & Resource Area Impacts (temporary & permanent):This is a Buffer Zone only project ­ Check if the project is located only in the Buffer Zone of a Bordering Vegetated Wetland,Inland Bank, or Coastal Resource Area.2.Inland Resource Areas: (See 310 CMR 10.54 ­ 10.58, if not applicable, go to Section B.3. Coastal Resource Areas)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Bank 1. linear feet 2. linear feetb.Bordering Vegetated Wetland 1. square feet 2. square feetc.Land under Waterbodies and Waterways 1. Square feet 2. square feet3. cubic yards dredgedd.Bordering Land Subject to Flooding 1. square feet 2. square feet3. cubic feet of flood storage lost 4. cubic feet replacede.Isolated Land Subject to Flooding 1. square feet2. cubic feet of flood storage lost 3. cubic feet replacedf.Riverfront Area 1. Name of Waterway (if any)2. Width of Riverfront Area (check one)25 ft. ­ Designated Densely Developed Areas only100 ft. ­ New agricultural projects only200 ft. ­ All other projects3. Total area of Riverfront Area on the site of the proposed project square feet4. Proposed Alteration of the Riverfront Area:a. total square feet b. square feet within 100 ft.c. square feet between 100 ft.and 200 ft.5. Has an alternatives analysis been done and is it attached to this NOI?Yes No6. Was the lot where the activity is proposed created prior to August 1, 1996?Yes No3.Coastal Resource Areas: (See 310 CMR 10.25 ­ 10.35)Resource Area Size of Proposed Alteration Proposed Replacement (if any)a.Designated Port Areas Indicate size under Land under the ocean below,b.Land Under the Ocean 1. square feet2. cubic yards dredgedc.Barrier Beaches Indicate size under Coastal Beaches and/or Coatstal Dunes, belowd.Coastal Beaches 1. square feet 2. cubic yards beach nourishmente.Coastal Dunes 1. square feet 2. cubic yards dune nourishmentf.Coastal Banks 1. linear feetg.Rocky Intertidal Shores 1. square feeth.Salt Marshes 1. square feet 2. sq ft restoration, rehab, crea.i.Land Under Salt Ponds 1. square feet2. cubic yards dredgedj.Land Containing Shellfish 1. square feetk.Fish Runs Indicate size under Coastal Banks, Inland Bank, Land Under the Ocean, and/or inland LandUnder Waterbodies and Waterways, above1. cubic yards dredgedl.Land Subject to CoastalStorm Flowage 1. square feet4.Restoration/Enhancement Restoration/ReplacementIf the project is for the purpose of restoring or enhancing a wetland resource area in addition to the square footage that has beenentered in Section B.2.b or B.3.h above, please entered the additional amount here.a. square feet of BVW b. square feet of Salt Marsh5.Projects Involves Stream Crossings Project Involves Streams CrossingsIf the project involves Stream Crossings, please enter the number of new stream crossings/number of replacement stream crossings.a. number of new stream crossings b. number of replacement stream crossingsC. Other Applicable Standards and RequirementsStreamlined Massachusetts Endangered Species Act/Wetlands Protection Act Review1.Is any portion of the proposed project located in Estimated Habitat of Rare Wildlife as indicated on the most recentEstimated Habitat Map of State­Listed Rare Wetland Wildlife published by the Natural Heritage of Endangered Species program(NHESP)?a.Yes NoIf yes, include proof of mailing or hand delivery of NOI to:Natural Heritage and Endangered SpeciesProgramDivision of Fisheries and Wildlife1 Rabbit Hill RoadWestborough, MA 01581b. Date of map:FROM MAP VIEWERIf yes, the project is also subject to Massachusetts Endangered Species Act (MESA) review (321 CMR 10.18)....c. Submit Supplemental Information for Endangered Species Review * (Check boxes as they apply)1. Percentage/acreage of property to be altered:(a) within Wetland Resource Area percentage/acreage(b) outside Resource Area percentage/acreage2. Assessor's Map or right­of­way plan of site3. Project plans for entire project site, including wetland resource areas and areas outside of wetland jurisdiction, showingexisting and proposed conditions, existing and proposed tree/vegetation clearing line, and clearly demarcated limits of work **a.Project description (including description of impacts outside of wetland resource area & buffer zone)b. Photographs representative of the sitec. MESA filing fee (fee information available at: http://www.mass.gov/eea/agencies/dfg/dfw/natural­heritage/regulatory­review/mass­endangered­species­act­mesa/mesa­fee­schedule.html )Make check payable to "Natural Heritage & Endangered Species Fund" and mail to NHESP at above addressProjects altering 10 or more acres of land, also submit:d.Vegetation cover type map of sitee.Project plans showing Priority & Estimated Habitat boundariesd. OR Check One of the following1. Project is exempt from MESA review. Attach applicant letter indicating which MESA exemption applies. (See 321CMR 10.14, http://www.mass.gov/eea/agencies/dfg/dfw/laws­regulations/cmr/321­cmr­1000­massachusetts­endangered­species­act.html#10.14; the NOI must still be sent to NHESP if the project is within estimated habitat pursuant to 310 CMR10.37 and 10.59.)2. Separate MESA review ongoing.a. NHESP Tracking Numberb. Date submitted to NHESP3.Separate MESA review completed.Include copy of NHESP "no Take" determination or valid Conservation & Management Permit with approved plan.*Some projects not in Estimated Habitat may be located in Priority Habitat, and require NHESP review...2.For coastal projects only, is any portion of the proposed project located below the mean high waterline or in a fish run?a. Not applicable ­ project is in inland resource area onlyb.Yes NoIf yes, include proof of mailing or hand delivery of NOI to either:South Shore ­ Cohasset to Rhode Island, and the Cape & Islands:Division of Marine Fisheries ­ Southeast Marine Fisheries StationAttn: Environmental Reviewer836 S. Rodney French Blvd New Bedford, MA 02744 North Shore ­ Hull to New Hampshire:Division of Marine Fisheries ­ North Shore OfficeAttn: Environmental Reviewer30 Emerson AvenueGloucester, MA 01930If yes, it may require a Chapter 91 license. For coastal towns in the Northeast Region, please contact MassDEP's Boston Office.For coastal towns in the Southeast Region, please contact MassDEP's Southeast Regional office.3.Is any portion of the proposed project within an Area of Critical Environmental Concern (ACEC)?a.Yes No If yes, provide name of ACEC (see instructions to WPAForm 3 or DEP Website for ACEC locations). Note:electronic filers click on Website.b. ACEC Name4.Is any portion of the proposed project within an area designated as an Outstanding Resource Water (ORW) as designated in theMassachusetts Surface Water Quality Standards, 314 CMR 4.00?a.Yes No5.Is any portion of the site subject to a Wetlands Restriction Order under the Inland Wetlands Restriction Act (M.G.L.c. 131, §40A) or the Coastal Wetlands Restriction Act (M.G.L.c. 130, § 105)?a.Yes No6.Is this project subject to provisions of the MassDEP Stormwater Management Standards?1.Applying for Low Impact Development (LID) site design credits (as described in Stormwater Management HandbookVol.2, Chapter 3)2.A portion of the site constitutes redevelopment3.Proprietary BMPs are included in the Stormwater Management Systemb.No, Explain why the project is exempt:1.Single Family Home2.Emergency Road Repair3.Small Residential Subdivision (less than or equal to 4 single­family houses or less than or equal to 4 units in multi­familyhousing project) with no discharge to Critical Areas.D. Additional InformationApplicants must include the following with this Notice of Intent (NOI). See instructions for details.Online Users: Attach the document transaction number (provided on your receipt page) for any of the following information yousubmit to the Department by regular mail delivery.1.USGS or other map of the area (along with a narrative description, if necessary) containing sufficient information for theConservation Commission and the Department to locate the site. (Electronic filers may omit this item.)2.Plans identifying the location of proposed activities (including activities proposed to serve as a Bordering Vegetated Wetland[BVW] replication area or other mitigating measure) relative to the boundaries of each affected resource area.3.Identify the method for BVW and other resource area boundary delineations (MassDEP BVW Field Data Form(s).Determination of Applicability, Order of Resource Area Delineation, etc.), and attach documentation of the methodology.4.List the titles and dates for all plans and other materials submitted with this NOI.a. Plan Title:b. Plan Prepared By:c. Plan Signed/Stamped By:c. Revised Final Date:e. Scale:SITE UBR#4: CURVEHILL ROADSTORMWATERRETROFIT DESIGNANDIMPLEMENTATIONPROJECT ­ 75%DESIGN YARMOUTH,MASSACHUSETTS HORSLEY WITTENGROUP, INC.RICHARD CLAYTOR, P.E.SEPTEMBER 2024 1"=10'STORMWATERMANAGEMENTREPORT ­ CURVEHILL ROAD, YARMOUTH, MA HORSLEY WITTENGROUP, INC AUGUST 2024 SITE UBR­4 CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT ­ YARMOUTH, MASSACHUSETTS HORSLEY WITTEN GROUP, INC.DANIEL MACKENZIE, PLS FEBUARY 2024 1"=20' WETLAND RESOURCE MEMORANDUM ­ STORMWATER RETROFIT SITES IN YARMOUTH, MA HORSLEY WITTEN GROUP, INC.MAY 21, 2024 5.If there is more than one property owner, please attach a list of these property owners not listed on this form. 6.Attach proof of mailing for Natural Heritage and Endangered Species Program, if needed. 7.Attach proof of mailing for Massachusetts Division of Marine Fisheries, if needed. 8.Attach NOI Wetland Fee Transmittal Form. 9.Attach Stormwater Report, if needed. E. Fees 1. Fee Exempt: No filing fee shall be assessed for projects of any city, town, county, or district of the Commonwealth, federally recognized Indian tribe housing authority, municipal housing authority, or the Massachusetts Bay Transportation Authority. Applicants must submit the following information (in addition to pages 1 and 2 of the NOI Wetland Fee Transmittal Form) to confirm fee payment: 2. Municipal Check Number 3. Check date 4. State Check Number 5. Check date 6. Payer name on check: First Name 7. Payer name on check: Last Name F. Signatures and Submittal Requirements I hereby certify under the penalties of perjury that the foregoing Notice of Intent and accompanying plans, documents, and supporting data are true and complete to the best of my knowledge. I understand that the Conservation Commission will place notification of this Notice in a local newspaper at the expense of the applicant in accordance with the wetlands regulations, 310 CMR 10.05(5)(a). I further certify under penalties of perjury that all abutters were notified of this application, pursuant to the requirements of M.G.L. c. 131, § 40. Notice must be made by Certificate of Mailing or in writing by hand delivery or certified mail (return receipt requested) to all abutters within 100 feet of the property line of the project location. 1. Signature of Applicant 2. Date 3. Signature of Property Owner(if different)4. Date 5. Signature of Representative (if any)6. Date For Conservation Commission: Two copies of the completed Notice of Intent (Form 3), including supporting plans and documents, two copies of the NOI Wetland Fee Transmittal Form, and the city/town fee payment, to the Conservation Commission by certified mail or hand delivery. For MassDEP: One copy of the completed Notice of Intent (Form 3), including supporting plans and documents, one copy of the NOI Wetland Fee Transmittal Form, and a copy of the state fee payment to the MassDEP Regional Office (see Instructions) by certified mail or hand delivery. Other: If the applicant has checked the "yes" box in Section C, Items 1­3, above, refer to that section and the Instructions for additional submittal requirements. The original and copies must be sent simultaneously. Failure by the applicant to send copies in a timely manner may result in dismissal of the Notice of Intent. Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Intent Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 7 of 8 * ELECTRONIC COPY 9/18/2024 A. Applicant Information 1. Applicant: a. First Name JEFFREY b.Last Name COLBY c. Organization TOWN OF YARMOUTH d. Mailing Address 1146 ROUTE 28 e. City/Town SOUTH YARMOUTH f. State MA g. Zip Code 02664 h. Phone Number 5083982231 i. Fax j. Email Jcolby@yarmouth.ma.us 2.Property Owner:(if different) a. First Name JEFFERY b. Last Name COLBY c. Organization TOWN OF YARMOUTH d. Mailing Address 1146 ROUTE 28 e. City/Town SOUTH YARMOUTH f.State MA g. Zip Code 02664 h. Phone Number 5083982231 i. Fax j.Email Jcolby@yarmouth.ma.us 3. Project Location: a. Street Address CURVE HILL RD b. City/Town YARMOUTH Are you exempted from Fee? (YOU HAVE SELECTED 'YES') Note: Fee will be exempted if you are one of the following: City/Town/County/District Municipal Housing Authority Indian Tribe Housing Authority MBTA State agencies are only exempt if the fee is less than $100 B. Fees Activity Type Activity Number Activity Fee RF Multiplier Sub Total City/Town share of filling fee $0.00 State share of filing fee $0.00 Total Project Fee $0.00 Massachusetts Department of Environmental Protection Bureau of Resource Protection ­ Wetlands WPA Form 3 ­ Notice of Wetland FeeTransmittal Form Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 Provided by MassDEP: MassDEP File #: eDEP Transaction #:1739229 City/Town:YARMOUTH Page 1 of 1 * ELECTRONIC COPY Yarmouth Conservation Commission • 1146 Route 28 • South Yarmouth, MA 02664-4492 Tel. (508)-398-2231 Ext. 1288 • Fax (508)-398-0836 • TTD# (508) 398-2231 Rev 3/2023 Page 1 of 2 Administrative Checklist Notice of Intent General Information: All filings must be made on Town of Yarmouth forms. The filing deadline is two weeks prior to the next scheduled Conservation Commission meeting for new applications. Failure to follow this Checklist shall result in an Administratively Incomplete Application and will not be advertised for a Public Hearing. Refer to the meeting schedule. Contact the Conservation Office if you need assistance. Submitting an Application: Does the property have any outstanding/expired Orders of Conditions? If so, please file a Request for Certificate of Compliance for each outstanding/expired Order, as the Commission may not issue a new Order until any outstanding/expired Orders have been closed and recorded. (*see page 2) Hardcopy filing dropped off or mailed to the Conservation Office including: 1 Administrative Checklist 1 NOI application with original signatures (double sided). Typed signatures will not be accepted. 1 detailed narrative of the project including: existing & proposed conditions, construction sequence, type of equipment, staging locations, drainage and stormwater, erosion controls, invasive species management and alternative analysis. The narrative shall include how the project meets performance standards per 310 CMR 10.0 & TOY Wetland Bylaw, Chapter 143, BVW delineation sheets or other resource area calculations, and supporting information. 1 100’ radius map, current abutters list identifying the property owners who are to be notified per 310 CMR 10.00 and abutter notification form. Abutters list must be certified by the Town Assessor’s office. The Assessor’s office requires 7 days advance notice. All abutters must be notified via certified mail. Certified Mail Receipts (PS Form 3800) for all abutters. Green cards to be submitted at the hearing. 1 original and 6 copies of the plan, folded separately, right side out with title and project address visible. All plans shall reference NAVD1988 unless otherwise noted. Landscape plans shall be detailed to show proposed & existing conditions, native species, size and spacing. See plan requirements Yarmouth’s share of State filing fee: Separate check made payable to “Town of Yarmouth” (refer to NOI Wetland Fee Transmittal Form) By-law filing fee: Separate check made payable to “Town of Yarmouth” Legal ad fee: Separate check made payable to “Town of Yarmouth” Please list project property’s street address on checks. Refer to Fee Schedule DEP share of the fee (refer to NOI form) shall be sent to: Dept. of Environmental Protection Box 4062 Boston, MA 02211 CONSERVATION OFFICE NA via email Yarmouth Conservation Commission • 1146 Route 28 • South Yarmouth, MA 02664-4492 Tel. (508)-398-2231 Ext. 1288 • Fax (508)-398-0836 • TTD# (508) 398-2231 Rev 3/2023 Page 2 of 2 Digital filing emailed to bdirienzo@yarmouth.ma.us including: A pdf of the entire signed application, supporting information listed above, and plan. Please list project property’s street address in the pdf file name. DEP Submittal If you are filing with MassDEP using eDEP, please include a copy of the submittal confirmation with your application. If not filing via eDEP, a copy of your application, plan, and all other supporting information must be sent VIA EMAIL the same day to DEP, Southeast Region at SERO_NOI@mass.gov with the subject line in the email per DEP’s request listed as “YARMOUTH - NOI - Street Address - Applicant Name” and copied to bdirienzo@yarmouth.ma.us. We must receive a copy of this email with the application as proof that it has been submitted to DEP. Initial below I CERTIFY that all on-site requirements will be completed by noon on the Friday prior to the hearing date. All proposed structures must be staked, and all relevant resource areas and buffer zones must be staked or flagged. Please consult the Yarmouth Wetland Regulations, page 17. Without proper staking your project may be deemed incomplete and be continued to the next hearing date. If Applicable Certified Mail Receipt for Massachusetts Natural Heritage and Endangered Species Program Certified Mail Receipt for Massachusetts Division of Marine Fisheries. If filing via email, CC bdirienzo@yarmouth.ma.us Waterway’s jurisdiction – Any coastal projects such as, but not limited to, docks, piers, bulkheads, revetments, dredging and boardwalks shall require submittal of all Notice of Intent, plans and supplemental information to the Town of Yarmouth Waterways/Shellfish Committee via the Natural Resources office by certified mail or hand delivery. The applicant or his/her representative must provide the Conservation office proof that this has been done or the filing will not be accepted. Other Requirements o Does the proposed project meet the applicable regulations of the Town of Yarmouth Zoning bylaws? Doyou need to file with the Yarmouth Board of Appeals? If so, you must file with both boards at the sametime. o If a vacant lot, have you completed and received a determination for the Building Department for a lotinquiry form? *To view all Conservation files/permits for the property address online, go to www.yarmouth.ma.us/LF NA NA NA X GK 101/ 196/ / / TOWN OF YARMOUTH 1146 ROUTE 28 SOUTH YARMOUTH, MA 02664-4463 101/ 197/ / / HUNT JOSEPH HUNT JUDITH 18 CURVE HILL ROAD SOUTH YARMOUTH, MA 02664 101/ 194/ / / BRYANT JOHN BRYANT BRENDA 203 GREAT WESTERN RD SOUTH YARMOUTH, MA 02664 101/ 195/ / / HOFFMAN KRISTIN L P O BOX 506 HOLLIS, NH 03049 101/ 193/ / / WEINBERGER JOSEPH WEINBERGER ELSIE M 9 FOUR SEASONS DR SOUTH YARMOUTH, MA 02664-2136 101/ 192/ / / CAPPADONA ANTHONY PETER AND SAND CAPPADONA JOSEPH A AND CAROLE M 15 FOUR SEASONS DR SOUTH YARMOUTH, MA 02664 91/ 71/ / / NEITERMAN BURTON TRS NEITERMAN ROZANNE TRS 21 FOUR SEASONS DR SOUTH YARMOUTH, MA 02664 91/ 70/ / / LEVINE MARTIN R LEVINE VICTORIA L 27 FOUR SEASONS DR SOUTH YARMOUTH, MA 02664 91/ 69/ / / RADZIEWICZ THOMAS C 33 FOUR SEASONS DR SOUTH YARMOUTH, MA 02664 91/ 58/ / / DILLON WILLIAM J DILLON FRANCES M 43 CURVE HILL RD SOUTH YARMOUTH, MA 02664-2104 91/ 72/ / / DAVENPORT DEWITT TR DAVENPORT REALTY TRUST 20 NORTH MAIN ST SOUTH YARMOUTH, MA 02664 101/ 17/ / / HARKINS ROBERT HARKINS MAUREEN 15 HILLCREST RD NORWOOD, MA 02062 101/ 20/ / / HAGUE MICHELLE M TRS HAGUE THOMAS F III TRS P O BOX 1394 ORLEANS, MA 02653 101/ 198/ / / HALL EDDY J HALL FLORENCE P 26 CURVE HILL RD SOUTH YARMOUTH, MA 02664 Please use this signature to certify this list of propertiesabutting within 100' of the parcel located at:Curve Hill Rd,South Yarmouth, MA 02664Assessors Map 101, Lot 196______________________________________Andy Machado, Director of Assessing NOTIFICATION TO ABUTTERS UNDER THE MASSACHUSETTS WETLANDS PROTECTION ACT & TOWN OF YARMOUTH WETLAND BY-LAW, CHAPTER 143 In accordance with the second paragraph of the Massachusetts General Laws Chapter 131, Section 40, you are hereby notified of the following: A. The name of the applicant is ________________________________________________ B. The applicant has filed a Notice of Intent with the Yarmouth Conservation Commission, seeking permission to remove, fill, dredge or alter an Area Subject to Protection under the Wetlands Protection Act (MGL c. 131 s. 40 & Town of Yarmouth Wetland By-Law, Chapter 143). C. The address of the lot where the activity is proposed is ______________________________ D. Proposed work is _____________________________________________________________ ____________________________________________________________________________ E.Copies of the Notice of Intent may be examined at the Yarmouth Town Hall at the Conservation Commission office between the hours of 9:00 a.m. and 4:00 p.m. Monday thru Friday. For more information, call (508) 398-2231 ext. 1288. F.Copies of the Notice of Intent may be obtained from either the applicant or applicant’s representative. Applicant’s phone number _____________________________________ Or Applicant’s representatives phone number ___________________________________ G.Information regarding the date, time and place of the public hearing may be obtained by calling the Yarmouth Conservation Commission office at (508) 398-2231 ext. 1288 H. Person sending this notification (applicant, representative or other) Name __________________________________________ Address ________________________________________ Town _________________ State _______ Zip _________ Telephone _______________________________________ NOTES : •Notice of the public hearing, including date, time and place will be published at least five (5) days in advance in a newspaper of general circulation. •Notice of the public hearing, including date, time and place will be posted in the Town Hall not less than forty-eight hours in advance. •You may also contact the Southeast Regional Office of the Department of Environmental Protection at (508) 946-2800 for more information about this application. 508-398-2231 Town of Yarmouth 508-833-6600 Gemma Kite 90 MA-6A #1 Sandwich MA 508-833-6600 02563 Curve Hill Road Map# 101 Lot# 196 The applicant, the Town of Yarmouth, is proposing a stormwater retrofit project at Curve Hill Road in Yarmouth, MA, in partnership with The Association to Preserve Cape Cod. As part of a broader effort, the Yarmouth Stormwater Design and Implementation Project, is aimed at enhancing water quality within the town. Revised 2/17/2017 AFFIDAVIT OF SERVICE Under the Massachusetts Wetlands Protection Act and the Town of Yarmouth Wetlands Protection Bylaw (To be submitted to the Massachusetts Department of Environmental Protection and the Conservation Commission when filing a Notice of Intent) I, , hereby certify under the (Name of person making the Affidavit) pains and penalties of perjury that on Horsley Witten Group, Inc. (Date) gave notification to abin compliance with the second paragraph of Massachusetts General Laws Chapter 131, Section 40, and the DEP Guide to Abutter Notification dated April 8, 1994, in connection with the following matter: A Notice of Intent filed under the Massachusetts Wetlands Protection Act by with the (Name of Municipality) (Name of Applicant) Conservation Commission on for property located at (Address of land where work is proposed) The form of the notification and a list of the abutters to whom it was given and their addresses, are attached to this Affidavit of Service. (Name) (Date) Gemma Kite, Horsley Witten Group, Inc. Jeffrey Colby, Town of Yarmouth Yarmouth September 19, 2024 September 19, 2024 0 Curve Hill Road (Assessor's Map 101, Lot 196) September 19, 2024 Project Narrative i Yarmouth Stormwater Retrofit Design and Implementation Project Curve Hill Road Site (UBR-4), Yarmouth, MA Table of Contents SUMMARY ....................................................................................................................... 1 1.0 INTRODUCTION ...................................................................................................... 2 1.1 Background ................................................................................................................................ 2 1.2 Project Goals ............................................................................................................................. 2 2.0 GENERAL SITE DESCRIPTION .................................................................................. 3 2.1 FEMA Designation ..................................................................................................................... 3 2.2 State-listed Rare Species Habitat .............................................................................................. 3 2.3 Wetland Resource Areas ........................................................................................................... 4 2.4 Receiving Water and Watershed ............................................................................................... 5 2.5 Environmental Justice Communities ......................................................................................... 6 3.0 PROPOSED PROJECT .............................................................................................. 6 3.1 Affected Jurisdictional Areas ..................................................................................................... 7 4.0 PROTECTION OF RESOURCE AREA INTERESTS ....................................................... 7 4.1 Protection of Local Buffer Zone Interests ................................................................................. 8 4.2 Erosion and Sedimentation Control .......................................................................................... 9 5.0 REFERENCES ......................................................................................................... 10 ATTACHMENTS Attachment A – Locus Maps Figure 1 – USGS Topographic Map Figure 2 – Aerial Photograph Figure 3 – FEMA Flood Zones & National Flood Insurance Program Figure 3A – FIRMette Map Figure 4 – Environmental Constraints Figure 5 – Soils Figure 6 – Environmental Justice Communities Figure 7 – Impaired Waters Attachment B – Wetland Data Forms Attachment C – Project Plans Attachment D – Stormwater Report [electronic copy only] Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 1 of 10 Yarmouth Stormwater Retrofit Design and Implementation Project Curve Hill Road, Yarmouth, MA September 2024 SUMMARY The Applicant, the Town of Yarmouth, is proposing a stormwater retrofit project at Curve Hill Road in Yarmouth, MA, in partnership with the Association to Preserve Cape Cod (APCC). This initiative is part of a broader effort, the Yarmouth Stormwater Design and Implementation Project, aimed at enhancing water quality within the town. The project builds upon the comprehensive assessment and stormwater management plan funded by Massachusetts Office of Coastal Zone Management (CZM) in FY23. Its primary objectives are to advance the design, permitting, and installation of high-priority Stormwater Control Measures (SCMs). Specifically, the proposed retrofit involves the creation of a constructed wetland that is designed to capture, manage and treat stormwater runoff from Great Western Road and Curve Hill Road prior to discharging to downgradient wetland resources. These efforts will significantly enhance water quality by removing stormwater pollutants, bolster flood control along Curve Hill Road, and support local wildlife habitat. Designed to enhance water quality and manage runoff from larger storms, the project aligns with the Massachusetts Stormwater Standards to the greatest extent feasible. Portions of the project will occur within a portion of the 35-50 and 50-100-foot buffer zones associated with a Bordering Vegetative Wetland, jurisdictional areas protected under the Massachusetts Wetlands Protection Act and the Town of Yarmouth Wetlands Protection Bylaw. The Applicant requests a waiver from Section 6.03 of the Town’s Wetland Protection Regulations. The proposed project will remove four trees from the buffer zones. Section 6.03 will not be met without additional expansion of the limit of work. Despite the minimal encroachment into these buffer zones, the project promises substantial benefits, including improved water quality, reduced runoff, and enhanced habitat. These improvements are expected to significantly mitigate stormwater issues at the site and alleviate ongoing impacts to Curve Hill Road and its surrounding watershed. Downgradient resource areas will be protected during and immediately following construction through implementation of an erosion and sedimentation control program. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 2 of 10 1.0 INTRODUCTION Coastal embayments across Cape Cod are significantly degraded by nutrient and bacteria impairment. Land uses, including stormwater runoff and fertilizer use, contribute on average 20% of the controllable nitrogen load within our coastal watersheds (Cape Cod Commission 208 Plan, 2015) and bacterial contamination, including cyanobacteria, regularly causes closures of beaches. In the report by the Association to Preserve Cape Cod (APCC) (APCC’s 2022 State of the Waters), 90% of the coastal embayments and 39% of the freshwater ponds assessed received unacceptable water quality scores. These high nutrient loads are of concern for the environment, our coastal economy, and public health as they negatively impact habitat for fish and shellfish and can result in unsafe conditions for swimming, fishing, and boating. 1.1 Background As part of a Coastal Zone Management (CZM) Coastal Habitat and Water Quality Grant, the Town of Yarmouth Department of Public Works (DPW), together with APCC, and Horsley Witten Group, Inc. (HW) conducted a comprehensive assessment and developed a town-wide stormwater management plan. This plan identified and prioritized stormwater retrofit sites along the south shore of Yarmouth. Concept designs were evaluated and ranked based on several criteria: potential pollutant removal (including load and drainage area), the water quality status of the associated waterbody, construction cost and feasibility, and additional benefits such as restored shellfish and anadromous fish habitats, improved climate resilience, and opportunities for public education. With additional support from a second Coastal Habitat and Water Quality Grant, 25% designs were created for five high-priority sites. Of these, two sites, including this one on Curve Hill Road, and another site along Standish Way, were selected to advance to 75% design and permitting. Additional funding is now available to progress these two priority sites to 100% design and construction. 1.2 Project Goals The purpose of this project is to improve water quality in the Bass River watershed by reducing or eliminating pollutant loads from stormwater runoff from Great Western Road and Curve Hill Road using green stormwater infrastructure (GSI). Specifically, the project aims to maximize pollutant removal (bacteria, nitrogen and phosphorus) and the water quality volume treated. Over time, it is anticipated that installed stormwater control measures (SCMs) will lead to a reduction in nutrient levels within downgradient waters and a reduction in the frequency and/or length of beach closures and shellfish bed closures related to bacteria contamination. As required for retrofit projects, the stormwater system for the project has been designed to conform to the requirements of the Massachusetts Stormwater Standards (MASMS) to the maximum extent practicable. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 3 of 10 2.0 GENERAL SITE DESCRIPTION The Curve Hill Road site is located on Town-owned land between Curve Hill Road and Four Seasons Drive, southwest of the Curve Hill Road and Great Western Road intersection in the western portion of Yarmouth, approximately half a mile west of Bass River. The approximately 1.54-acre undeveloped site is surrounded by residential properties, except for a section to the north and southwest where it directly borders the Curve Hill Road right-of-way (ROW). The Blue Rock Golf Course is located to the west of the site, just beyond the residential lots on the west side of Curve Hill Road. (Attachment A, Figures 1 and 2). Currently, the site receives a large volume of stormwater runoff through drainage infrastructure along Great Western Road and runoff from Curve Hill Road resulting in significant sediment buildup in the upper reaches. The southern (or lower) reaches of the site are occupied by an area of Bordering Vegetative Wetland (BVW) associated with Bass River. 2.1 FEMA Designation The current FEMA Flood Insurance Rate Map (Community Panel No. 25001C0586J, effective July 16, 2014) indicates that the Curve Hill Road site (UBR-4) is located within Other Areas of Flood Hazard, Zone X (0.2% annual chance of flooding with average depth less than one foot or with drainage areas less than one square mile) (Attachment A, Figure 3). 2.2 State-listed Rare Species Habitat According to the most recent version of the Massachusetts Natural Heritage Atlas (15th Edition, August 1, 2021), the project site does not occur within areas of Estimated Habitat of Rare Wildlife and/or Priority Habitat of Rare Species, as designated by the Massachusetts Natural Heritage and Endangered Species Program (NHESP) (Attachment A, Figure 4). Photo 1. View of project site looking south from Curve Hill Road. Existing paved flume and sedimentation visible in foreground (Photo taken March 2023). Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 4 of 10 2.3 Wetland Resource Areas As noted, the southern portion of this site supports an area of BVW and associated buffer zones, jurisdictional resource areas under the Massachusetts Wetlands Protection Act (M.G.L. Ch. 131 § 40) and the Town of Yarmouth Wetlands Protection By-law (Chapter 143). HW wetland biologists identified and delineated the BVW boundary. A Massachusetts State Boardering Vegetated Wetland Determination Form was completed for the survey and can be found in Attachment B. BVWs are defined under Massachusetts WPA Regulations at 310 CMR 10.55(2)(a) as: “freshwater wetlands that border on creeks, rivers, streams, ponds and lakes. The types of freshwater wetlands are wet meadows, marshes, swamps and bogs. Bordering Vegetated Wetlands are areas where the soils are saturated and/or inundated such that they support a predominance of wetland indicator plants. The boundary of Bordering Vegetated Wetland is defined at 310 CMR 10.55 (2)(c) as the line within which 50% or more of the vegetational community consists of wetland indicator plants and saturated or inundated conditions exist.” The Yarmouth Wetland Protection Regulations define Vegetated Wetlands [3.02(2)] as follows: “Vegetated wetlands are brackish and freshwater wetlands. The types of brackish and freshwater wetland are wet meadows, marshes, swamps and bogs. They are areas where the topography is low and flat, and where soils are annually saturated. The ground and surface water regime and the vegetational community which occur in each type of freshwater wetland are specified in section 3.02, (2), (c). “The boundary of a vegetated wetland is the line within which 50% or more of vegetational community consists of the wetland plant species identified in sections 3.02, (1) thru 3.02, (2), Photo 2. Northern end of the BVW/Vegetated Wetland looking south from adjacent upland. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 5 of 10 (c), (4), below. A minimum size of 3000 square feet is required for jurisdiction under these regulations.” The BVW/Vegetated Wetland extends south in a continuous linear corridor to Highbank Road where it connects through a culvert to an unnamed stream that flows to the Bass River. The northern finger of the BVW, closest to the project site, is confined by a gradually rising slope to the north and steeper-rising slopes to the east and west. The wetland transitions to a pitch pine-oak upland woodland to the north, where the proposed project site is located. Common species observed within the northern portions of the BVW include tupelo (Nyssa sylvatica), red maple (Acer rubrum), pitch pine (Pinus rigida), sweet pepperbush (Clethra alnifolia), Japanese holly (Ilex crenata), highbush blueberry (Vaccinium corymbosum), and sheep laurel (Kalmia angustifolia). Common species observed in the adjacent upland woodlands include mixed oaks (Quercus spp.), pitch pine, American holly (Ilex opaca), Japanese holly, highbush blueberry, sweet-pepperbush, and common greenbrier (Smilax rotundifolia). The NRCS Soil Survey indicates the presence of hydric soils (Freetown -54A) in the southern portion of the site (Attachment A, Figure 5); field investigations confirm the presence of hydric soils within the wetland area. HW delineated the boundary of the BVW/Vegetated Wetland with consecutive pink flagging stations labeled BVW 100 through BVW 106. 2.4 Receiving Water and Watershed Runoff from Great Western Road and Curve Hill Road discharges into this site, and into the BVW, which ultimately discharges into Bass River that opens into Nantucket Sound. Bass River provides important habitat for shellfish growing areas. However, it is listed as impaired for total nitrogen and fecal coliform by the most recent Massachusetts DEP 303(d) – 2022 Integrated list of Waters. Bass River is located in the Bass River Watershed, for which TMDL documents have been developed for nitrogen, fecal coliform, nutrient/eutrophication biological indicators, and estuarine bioassessments. The full list of impairments for this portion of the watershed is listed below, and a map showing these resources is included in Figure 6 (Attachment A): • Bass River (MA96-118) “Grand Cove” portion, Yarmouth, Bass River Watershed – Impaired for total nitrogen and nutrient/eutrophication biological indicators; Category 4a (TMDL completed) of the 2018/2020 Integrated List of Waters. • Bass River (MA96-12) Headwaters outlet, Yarmouth, Bass River Watershed – Impaired for total nitrogen, fecal coliform, and estuarine bioassessments; Category 4a (TMDL completed) of the 2018/2020 Integrated List of Waters. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 6 of 10 2.5 Environmental Justice Communities The project site is located within approximately 1.5-2 miles of several mapped Environmental Justice (EJ) communities (Attachment A, Figure 6). In Massachusetts, a neighborhood is defined as an EJ population if one or more of the following four criteria are true: the annual median household income is not more than 65 percent of the statewide annual median household income; minorities comprise 40 percent or more of the population; 25 percent or more of households lack English language proficiency, or minorities comprise 25 percent or more of the population and the annual median household income of the municipality in which the neighborhood is located does not exceed 150 percent of the statewide annual median household income. The Commonwealth of Massachusetts states that EJ is based on the principle that all people have a right to be protected from environmental hazards and to live in and enjoy a clean and healthful environment. The principle of EJ is the equal protection and meaningful involvement of all people with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies and the equitable distribution of environmental benefits. The Town held a public meeting at the 25% design phase to engage with the community and obtain feedback on the proposed site elements and overall design. Overall, the proposed project is anticipated to benefit these communities as well as the greater Town population in Yarmouth, the adjacent municipality sharing common water resources along the Bass River, and the visiting public by improving water quality within the watershed and the recreational amenities provided by these waters. 3.0 PROPOSED PROJECT The proposed stormwater management includes a GSI approach to capture and treat runoff by installing a constructed stormwater wetland. This type of GSI practice mimics natural wetlands to manage and treat stormwater by allowing settling of sediments and filtering stormwater through a mix of native vegetation. The system consists of an inflow component, including a water quality unit for pretreatment, a series of pools of varying depths, and an overflow spillway for discharge. Stormwater is designed to be directed to the stormwater constructed wetland from Great Western Road through the existing drainage outfall pipe and from Curve Hill Road via a drop inlet into the water quality unit. The project will manage and treat runoff from the contributing watershed and is designed to meet the MASWMS to the maximum extent practicable. While minor portions of the project will occur within the 35-50 and 50-100-foot buffer zone to BVW, much of the proposed work is located in the adjacent upland area that will result in vast Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 7 of 10 improvements to the downgradient resource area. An overview of the various project components and a discussion of the affected jurisdictional areas are described below. Details of the proposed project are provided on the attached project plans, entitled “Site UBR #4: Curve Hill Road Stormwater Retrofit Design and Implementation Project – 75% Design, Yarmouth, Massachusetts,” dated September 2024 prepared by HW (Attachment C) and within the Stormwater Management Report, dated September 2024, provided in Attachment D. 3.1 Affected Jurisdictional Areas While focused on the constructed wetland, only portions of the project will occur within the locally regulated buffer zones to the BVW as summarized in Table 1. Table 1. Summary of Resource Area Impacts Jurisdictional Area Impact (SF) Nature of Impact 35-50-foot Buffer Zone to BVW 370 Rip-rap 50-100-foot Buffer Zone to BVW 3,250 Rip-rap, Constructed Wetland 4.0 PROTECTION OF RESOURCE AREA INTERESTS The retrofit project aims to enhance water quality within the Bass River watershed by installing a constructed wetland, a GSI practice that will filter pollutants from stormwater, including total suspended solids, phosphorus, nitrogen, and bacteria. By capturing and treating these contaminants, the constructed wetland will improve the water quality within the receiving water body, the Bass River, benefiting the overall health of the watershed. Additionally, the project will incorporate invasive species management strategies to prevent the establishment and spread of non-native plants that could disrupt the wetland ecosystem. The only jurisdictional area identified in proximity to the site is a BVW/Vegetated Wetland. The proposed project activities have been carefully planned to ensure compliance with all relevant regulations and do not involve any of the prohibited practices specified in Section 2.11(1)(b)(1- 6) of the Yarmouth Wetland Regulations. The Applicant requests a waiver from Section 6.03 of the Town’s Wetland Protection Regulations, as the proposed project will remove four trees from the buffer zones. Section 6.03 will not be met without additional expansion of the limit of work to offset the trees being removed; however, the proposed native plantings will benefit the project, providing improved habitat and enhanced water filtration. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 8 of 10 4.1 Protection of Local Buffer Zone Interests While portions of the constructed wetland will occur within the buffer zone to BVW/Vegetated Wetlands, and particularly within the locally protected buffer zones, it has been designed to meet all performance standards for work in this sensitive area. In accordance with Section 5.02(3)(a) of the Yarmouth Wetland Protection Regulations, performance standards for work within or adjacent to Vegetated Wetlands include the following provision: “Any proposed work, permitted by the Commission, in a vegetated wetland or within 100 feet of a vegetated wetland shall not destroy any portions of said vegetated wetland (except when allowed under section 5.06), nor shall the proposed work impair in any way the vegetated wetland’s ability to perform any of the functions in section 5.02 (1).” Further, Section 6.01(1)(a) states: (1) Notwithstanding section 6.01(2) below, no new structures, including swimming and spa pools (with the exception of water dependent structures), will be allowed within 50 feet of (…) Any freshwater or coastal vegetated wetlands.” The project site currently supports a vegetated buffer zone, and with the exception of the slight intrusion within the 35-50 foot buffer zone to accommodate the overflow spillway. This rip-rap for the spillway is necessary to support the proper functions of the stormwater constructed wetland and prevent erosion, will occupy 3,620 SF of this buffer area. In addition to providing water quality benefits within the resource areas and the receiving waters within Bass River, the constructed stormwater wetland will be planted with native species (see Sheet L-1 of the project plans, Attachment C). The proposed native plantings include obligate and facultative wetland species adapted to the variety of wetland habitats created by the stormwater practice, and potentially creating additional habitat for local wildlife. Peripheral areas are planted with native plant species designed to blend in with the surrounding natural plant community. The Yarmouth Wetland Protection Regulations Section 6.03(2) require any trees removed in a resource area or buffer zone to be replaced with native and climate resilient trees. The project will remove three trees in the 50-100-foot buffer: two 16-inch caliper pine trees, and one 20- inch caliper deciduous tree, and remove one tree in the 25-50-foot buffer: a 12-inch caliper deciduous tree. The project is proposing to plant four trees in the 35-50-foot and 50-100-foot buffers, along with a variety of native shrubs and herbaceous plants. A total of 2,680 square feet of plantings will be in the 50-100-foot buffer and 320 square feet will be in the 35-50-foot buffer zone to BVW/Vegetated Wetlands. Overall, this project consists of a total of 15,425 square feet of native plantings across the entire site. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 9 of 10 Further, Section 6.03(3) states: If the parcel is mitigation constrained, the Commission may require that the trees remain, or 16 square feet of native shrubs may be planted directly abutting the existing vegetated buffer in lieu of trees for each caliper inch that space is insufficient. To meet Section 6.03 requirements, the project would need to significantly increase the Limit of Work for the sole purpose of planting replacement trees or native shrubs. Since the project’s goal is to improve water quality in the downgradient waters and to create and support local wildlife habitat, resulting in an ecological improvement over existing conditions, the Applicant requests a waiver from this requirement. Finally, prior to construction, the project will implement an erosion and sedimentation control (ESC) program as discussed below, to protect the downgradient resources. ESC measures will remain in place until all disturbed soils are stabilized with vegetation. 4.2 Erosion and Sedimentation Control Controlling erosion and sedimentation from the construction site is crucial for meeting the water quality goals of this retrofit project and adhering to MASWMS Standard 8. Although the site involves less than 1 acre of disturbance and therefore does not require a NPDES Construction General Permit Stormwater Pollution Plan (SWPPP), effective erosion and sediment controls (ESCs) are integral to the project’s design. Accordingly, an ESC Plan is included in the design plans (Attachment C), which outlines a detailed construction sequence and ESC measures. To manage sedimentation, silt socks will be installed along the downgradient edges of the disturbed area, and regular street sweeping will be conducted on Curve Hill Road to reduce sediment tracking. Additional sediment traps or basins will be provided as needed. Disturbed areas will be promptly stabilized using pavement, seeding, and/or erosion control blankets to minimize erosion and sedimentation. For further details on these measures, refer to the Stormwater Report in Attachment D. The contractor must implement these erosion controls before starting any other project-related activities. The ESC Plan will define the work limits to prevent operations beyond these boundaries. The contractor is responsible for ongoing monitoring and adjustment of erosion control practices throughout the project. Erosion control measures will remain in place until the project is completed, as directed by the project engineer or landscape architect. Notice of Intent Horsley Witten Group, Inc. Curve Hill Road (UBR-4), Yarmouth, MA September 2024 Page 10 of 10 5.0 REFERENCES Association to Preserve Cape Cod. 2022. State of the Waters: Cape Cod Report. Cape Cod Commission. 2015. 208 Plan – Cape Cod’s Area Wide Water Quality Management Plan Updated. MassDEP. 2023. Final Massachusetts Integrated List of Waters for the Clean Water Act 2022 Reporting Cycle. CN 568.1, Massachusetts Department of Environmental Protection, Bureau of Water Resources, Division of Watershed Management, Watershed Planning Program. Worcester, MA (Available at https://www.mass.gov/lists/integrated-lists-of-waters-related- reports). MassGIS (Massachusetts Office of Geographic and Environmental Information). 2023. See their homepage at: http://www.mass.gov/mgis/. Attachment A – Locus Maps 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 FLOODHAZARD AREAS Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or DepthZone AE, AO, AH, VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas 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 SCREENArea 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 basemapaccuracy standards The flood hazard information is derived directly from theauthoritative NFHL web services provided by FEMA. This mapwas exported on 9/12/2024 at 5:15 PM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome 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 approximatepoint selected by the user and does not representan authoritative property location. 1:6,000 70°10'25"W 41°41'22"N 70°9'48"W 41°40'55"N Basemap Imagery Source: USGS National Map 2023 Figure 3A -FEMA Designation Attachment B – Wetland Data Forms BORDERING VEGETATED WETLAND DETERMINATION FORM Project/Site: ___________________________________ City/Town: ____________________ Sampling Date: ___________ Applicant/Owner: ____________________________________________ Sampling Point or Zone: ____________________ Investigator(s):_______________________________________________Latitude / Longitude:________________________ Soil Map Unit Name:_________________________________________ NWI or DEP Classification: ___________________ Are climatic/hydrologic conditions on the site typical for this time of year? Yes _____ No _____ (If no, explain in Remarks) Are Vegetation _______ , Soil ______ , or Hydrology _____ significantly disturbed? (If yes, explain in Remarks) Are Vegetation _______ , Soil ______ , or Hydrology _____ naturally problematic? (If yes, explain in Remarks) SUMMARY OF FINDINGS – Attach site map and photograph log showing sampling locations, transects, etc. Wetland vegetation criterion met? Yes ______ No ______ Is the Sampled Area within a Wetland? Yes ____ No _____ Hydric Soils criterion met? Yes ______ No ______ Wetlands hydrology present? Yes ______ No ______ Remarks, Photo Details, Flagging, etc.: HYDROLOGY Field Observations: Surface Water Present? Yes ______ No _______ Depth (inches) ______________ Water Table Present? Yes ______ No _______ Depth (inches) ______________ Saturation Present (including capillary fringe)? Yes ______ No _______ Depth (inches) ______________ Wetland Hydrology Indicators Reliable Indicators of Wetlands Hydrology Indicators that can be Reliable with Proper Interpretation Indicators of the Influence of Water ____ Water-stained leaves ___ Hydrological records ____ Direct observation of inundation ____ Evidence of aquatic fauna ___ Free water in a soil test hole ____ Drainage patterns ____ Iron deposits ___ Saturated soil ____ Drift lines ____ Algal mats or crusts ___ Water marks ____ Scoured areas ____ Oxidized rhizospheres/pore linings ___ Moss trim lines ____ Sediment deposits ____ Thin muck surfaces ___ Presence of reduced iron ____ Surface soil cracks ____ Plants with air-filled tissue (aerenchyma) ___ Woody plants with adventitious roots ____ Sparsely vegetated concave surface ____ Plants with polymorphic leaves ___ Trees with shallow root systems ____ Microtopographic relief ____ Plants with floating leaves ____ Hydrogen sulfide odor ___ Woody plants with enlarged lenticels ____ Geographic position (depression, toe of slope, fringing lowland Remarks (describe recorded data from stream gauge, monitoring well, aerial photos, previous inspections, if available): This form is only for BVW delineations. Other wetland resource areas may be present and should be delineated according to the applicable regulatory provisions. &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ Curve Hill Road (UBR-4) Yarmouth 12/05/2023 Town of Yarmouth WET PLOT Ben Wollman 41.6851/ -70.1684 Carver coarse sand, 15 to 35 percent slopes (252D) Freshwater Forest/Shrub Wetland (PFO1/4E) ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Sampling Point__________ 2 VEGETATION – Use both common and scientific names of plants. Tree Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. ________ = Total Cover Shrub/Sapling Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. ________ = Total Cover Herb Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. ________ = Total Cover &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ WET PLOT Variable-size observation plot Black gum Nyssa sylvatica FAC 21.0 Yes Yes Red Maple Acer rubrum FAC 11.0 Yes Yes Pitch Pine Pinus Rigida FACU 11.0 Yes No 43.0 Variable-size observation plot Sweet pepper bush Clethra alnifolia FAC 38.0 Yes Yes Highbush blueberry Vaccinium corymbosum FACW 11.0 No Yes Japanes holly Ilex crenata UPL 11.0 No No Red Maple Acer rubrum FAC 3.0 No Yes Black gum Nyssa sylvatica FAC 3.0 No Yes Inkberry Ilex glabra FACW 3.0 No Yes 69.0 Variable-size observation plot Sweet pepper bush Clethra alnifolia FAC 11.0 Yes Yes 11.0 Sampling Point__________ 3 VEGETATION – continued. Woody Vine Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. ________ = Total Cover Rapid Test: Do all dominant species have an indicator status of OBL or FACW? Yes _____ No ________ Dominance Test: Number of dominant species Number of dominant species that are wetland indicator plants Do wetland indicator plants make up ш 50% of dominant plant species? Yes ______ No _______ Prevalence Index: OBL species Total % Cover (all strata) Multiply by: Result X 1 = FACW species X 2 = FAC species X 3 = FACU species X 4 = UPL species X 5 = Column Totals (A) (B) Prevalence Index B/A = Is the Prevalence Index ч 3.0? Yes ______ No _______ Wetland vegetation criterion met? Yes _______ No ________ Definitions of Vegetation Strata Tree - Woody plants 3 in. (7.62 cm) or more in diameter at breast height (DBH), regardless of height Shrub / Sapling - Woody plants less than 3 in. (7.62 cm) DBH and greater than or equal to 3.3 ft. (1 m) tall Herb - All herbaceous (non-woody plants, regardless of size, and woody plants less than 3.3 ft. (1 m) tall Woody vines - All woody vines greater than 3.3 ft. (1 m) in height Cover Ranges Range Midpoint 1-5 % 3.0 % 6-15 % 10.5 % 15-25 % 20.5 % 26-50 % 38.0 % 51-75 % 63.0 % 76-95 % 85.5 % 96-100 % 98.0 % &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ WET PLOT Variable-size observation plot Roundleaf greenbrier Smilax rotundifolia FAC 3.0 No Yes 3.0 ✔ 54 ✔ 0 14 90 11 11 0.00 28.00 270.00 44.00 55.00 126 397 3.15 ✔ ✔ Sampling Point__________ 4 SOIL Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators) Depth (inches) Matrix Redox Features Texture Remarks Color (moist) % Color (moist) % Type1 Location2 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, MS=MaskĞd Sand Grains 2Location: PL=Pore Lining, M=Matrix Hydric Soil Indicators (Check all that apply) Indicators for Problematic Hydric Soils ____ Histosol (A1) ____ Polyvalue Below Surface (S8) ____ 2 cm Muck (A10) ____ Histic Epipedon (A2) ____ Thin Dark Surface (S9) ___ 5 cm Mucky Peat or Peat (S3) ____ Black Histic (A3) ____ Hydrogen Sulfide (A4) ____ Loamy Gleyed Matrix (F2) ____ Stratified Layers (A5) ____ Depleted Matrix (F3) ____ Depleted Below Dark Surface (A11) ____ Redox Dark Surface (Fϲ) ___ Iron-Manganese Masses (F12) ____ Thick Dark Surface (A12) ____ Depleted Dark Surface (Fϳ) ___ Mesic Spodic (A17) ____ Sandy Mucky Mineral (S1) ___ Red Parent Material (F21) ____ Sandy Gleyed Matrix (S4) ___ Very Shallow Dark Surface (FϮϮ) ____ Sandy Redox (S5) ___ Other (Include Explanation in Remarks) ____ Stripped Matrix (S6) ____ Dark Surface (S7) Restrictive Layer (if observed) Type: _____________________________ Depth (inches): ______________________ Remarks: Hydric Soils criterion met? Yes _______ No ________ ____ ZĞĚŽdžĞƉƌĞƐƐŝŽŶƐ(&ϴ) &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ WET PLOT 0-3 10YR 3/2 100.00 sandy silt 3-6 10YR 4/1 100.00 medium to coarse sand 6-14 10YR 2/1 100.00 loamy sand sulfur odor 14-16 10YR 4/2 80.00 10YR 6/1 20.00 D coarse sand 16-18 10YR 2/1 100.00 coarse sand ✔ Soil pit was located downgradient of BVW 102 ✔ BORDERING VEGETATED WETLAND DETERMINATION FORM Project/Site: ___________________________________ City/Town: ____________________ Sampling Date: ___________ Applicant/Owner: ____________________________________________ Sampling Point or Zone: ____________________ Investigator(s):_______________________________________________Latitude / Longitude:________________________ Soil Map Unit Name:_________________________________________ NWI or DEP Classification: ___________________ Are climatic/hydrologic conditions on the site typical for this time of year? Yes _____ No _____ (If no, explain in Remarks) Are Vegetation _______ , Soil ______ , or Hydrology _____ significantly disturbed? (If yes, explain in Remarks) Are Vegetation _______ , Soil ______ , or Hydrology _____ naturally problematic? (If yes, explain in Remarks) SUMMARY OF FINDINGS – Attach site map and photograph log showing sampling locations, transects, etc. Wetland vegetation criterion met? Yes ______ No ______ Is the Sampled Area within a Wetland? Yes ____ No _____ Hydric Soils criterion met? Yes ______ No ______ Wetlands hydrology present? Yes ______ No ______ Remarks, Photo Details, Flagging, etc.: HYDROLOGY Field Observations: Surface Water Present? Yes ______ No _______ Depth (inches) ______________ Water Table Present? Yes ______ No _______ Depth (inches) ______________ Saturation Present (including capillary fringe)? Yes ______ No _______ Depth (inches) ______________ Wetland Hydrology Indicators Reliable Indicators of Wetlands Hydrology Indicators that can be Reliable with Proper Interpretation Indicators of the Influence of Water ____ Water-stained leaves ___ Hydrological records ____ Direct observation of inundation ____ Evidence of aquatic fauna ___ Free water in a soil test hole ____ Drainage patterns ____ Iron deposits ___ Saturated soil ____ Drift lines ____ Algal mats or crusts ___ Water marks ____ Scoured areas ____ Oxidized rhizospheres/pore linings ___ Moss trim lines ____ Sediment deposits ____ Thin muck surfaces ___ Presence of reduced iron ____ Surface soil cracks ____ Plants with air-filled tissue (aerenchyma) ___ Woody plants with adventitious roots ____ Sparsely vegetated concave surface ____ Plants with polymorphic leaves ___ Trees with shallow root systems ____ Microtopographic relief ____ Plants with floating leaves ____ Hydrogen sulfide odor ___ Woody plants with enlarged lenticels ____ Geographic position (depression, toe of slope, fringing lowland Remarks (describe recorded data from stream gauge, monitoring well, aerial photos, previous inspections, if available): This form is only for BVW delineations. Other wetland resource areas may be present and should be delineated according to the applicable regulatory provisions. &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ Curve Hill Road (UBR-4) Yarmouth 12/05/2023 Town of Yarmouth UP PLOT Ben Wollman 41.6851/ -70.1684 Carver coarse sand, 15 to 35 percent slopes (252D) Freshwater Forest/Shrub Wetland (PFO1/4E) ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ Sampling Point__________ 2 VEGETATION – Use both common and scientific names of plants. Tree Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. ________ = Total Cover Shrub/Sapling Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. ________ = Total Cover Herb Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. ________ = Total Cover &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ UP PLOT Variable-size observation plot Black oak Quercus velutina UPL 38.0 Yes Yes Pitch Pine Pinus rigida FACU 21.0 Yes Yes White oak Quercus alba FACU 11.0 Yes No 70.0 Variable-size observation plot Black oak Quercus velutina UPL 11.0 Yes Yes White oak Quercus alba FACU 3.0 No Yes Sweet pepper bush Clethra alnifolia FAC 3.0 No No Highbush blueberry Vaccinium corymbosum FACW 3.0 No Yes Japanese holly Ilex crenata UPL 3.0 No Yes 23.0 Variable-size observation plot Sweet pepper bush Clethra alnifolia FAC 3.0 No Yes 3.0 Sampling Point__________ 3 VEGETATION – continued. Woody Vine Stratum Plot size _______________________ Common name Scientific name Indicator Status Absolute % Cover Dominant? (yes/no) Wetland Indictor? (yes/no) 1. 2. 3. 4. ________ = Total Cover Rapid Test: Do all dominant species have an indicator status of OBL or FACW? Yes _____ No ________ Dominance Test: Number of dominant species Number of dominant species that are wetland indicator plants Do wetland indicator plants make up ш 50% of dominant plant species? Yes ______ No _______ Prevalence Index: OBL species Total % Cover (all strata) Multiply by: Result X 1 = FACW species X 2 = FAC species X 3 = FACU species X 4 = UPL species X 5 = Column Totals (A) (B) Prevalence Index B/A = Is the Prevalence Index ч 3.0? Yes ______ No _______ Wetland vegetation criterion met? Yes _______ No ________ Definitions of Vegetation Strata Tree - Woody plants 3 in. (7.62 cm) or more in diameter at breast height (DBH), regardless of height Shrub / Sapling - Woody plants less than 3 in. (7.62 cm) DBH and greater than or equal to 3.3 ft. (1 m) tall Herb - All herbaceous (non-woody plants, regardless of size, and woody plants less than 3.3 ft. (1 m) tall Woody vines - All woody vines greater than 3.3 ft. (1 m) in height Cover Ranges Range Midpoint 1-5 % 3.0 % 6-15 % 10.5 % 15-25 % 20.5 % 26-50 % 38.0 % 51-75 % 63.0 % 76-95 % 85.5 % 96-100 % 98.0 % &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ UP PLOT Variable-size observation plot Roundleaf greenbrier Smilax rotundifolia FAC 3.0 No Yes 3.0 ✔ 83 ✔ 0 6 9 35 52 0.00 12.00 27.00 140.00 260.00 102 439 4.30 ✔ ✔ Sampling Point__________ 4 SOIL Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators) Depth (inches) Matrix Redox Features Texture Remarks Color (moist) % Color (moist) % Type1 Location2 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, MS=MaskĞd Sand Grains 2Location: PL=Pore Lining, M=Matrix Hydric Soil Indicators (Check all that apply) Indicators for Problematic Hydric Soils ____ Histosol (A1) ____ Polyvalue Below Surface (S8) ____ 2 cm Muck (A10) ____ Histic Epipedon (A2) ____ Thin Dark Surface (S9) ___ 5 cm Mucky Peat or Peat (S3) ____ Black Histic (A3) ____ Hydrogen Sulfide (A4) ____ Loamy Gleyed Matrix (F2) ____ Stratified Layers (A5) ____ Depleted Matrix (F3) ____ Depleted Below Dark Surface (A11) ____ Redox Dark Surface (Fϲ) ___ Iron-Manganese Masses (F12) ____ Thick Dark Surface (A12) ____ Depleted Dark Surface (Fϳ) ___ Mesic Spodic (A17) ____ Sandy Mucky Mineral (S1) ___ Red Parent Material (F21) ____ Sandy Gleyed Matrix (S4) ___ Very Shallow Dark Surface (FϮϮ) ____ Sandy Redox (S5) ___ Other (Include Explanation in Remarks) ____ Stripped Matrix (S6) ____ Dark Surface (S7) Restrictive Layer (if observed) Type: _____________________________ Depth (inches): ______________________ Remarks: Hydric Soils criterion met? Yes _______ No ________ ____ ZĞĚŽdžĞƉƌĞƐƐŝŽŶƐ(&ϴ) &ŽƌŵZĞǀŝƐĞĚ:ƵůLJϮϬϮϯ UP PLOT 0-3 10YR 3/2 100.00 sandy silt 3-8 10YR 4/3 100.00 medium sand 8-15 10YR 5/8 100.00 medium sand Soil pit was located upgradient of BVW 102 ✔ Attachment C – Project Plans Site UBR#4: Curve Hill Road Stormwater Retrofit Design and Implementation Project – 75% Design Permitting Plans, Yarmouth, Massachusetts prepared by Horsley Witten Group, Inc. September 2024 AND Site UBR#4 Curve Hill Road Retrofit Design and Implementation Project Existing Condition Plan Yarmouth, MA prepared by Horsley Witten Group, Inc. February 2024 GRE A T W E S T E R N R D CURVE HILL RD CURVE H ILL RD MOORING LN 4 SEASONS DR4 SEASONS DR PAINE RD Sheet List Table Sheet Number Sheet Title 1 COVER SHEET 2 NOTES AND LEGEND 3 EROSION AND SEDIMENT CONTROL PLAN 4 SITE AND GRADING PLAN 5 DRAINAGE AND SITE DETAILS 6 PLANTING PLAN 7 PLANTING DETAILS LOCUS Project Number:Registration: VICINITY MAP last modified: 09/17/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD CV.dwg1 2 3 4 5 6 7Checked By: Drawn By: Designed By: Date Issued: Sheet Number: Revisions Appr.Rev.Date By Description Graphic Scale 1-inch = 100-feet Drawing Number: Horsley Witten Group, Inc. Sustainable Environmental Solutions www.horsleywitten.com Headquarters 90 Route 6A, Unit 1 Sandwich, MA 02563 Phone: (508) 833-6600Fax: (508) 833-3150 112 Water Street, 6th FloorBoston, MA 02109Phone: (857) 263-8193 1 Turks Head Place, Suite 300 Providence, RI 02903 Phone: (401) 272-1717Fax: (401) 437-8368 Prepared By: Plan Set: Prepared For: MASSACHUSETTS SCALE IN FEET North Graphic Scale YARMOUTH North SCALE IN FEET Graphic Scale SITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTS SEPTEMBER 2024 22108 of1 7 SITE UBR #4: CURVE HILL ROAD STORMWATER RETROFIT DESIGN AND IMPLEMENTATION PROJECT - 75% DESIGN YARMOUTH, MASSACHUSETTS Town of Yarmouth DPW 74 Town Brook Road West Yarmouth, MA 02673 (508) 398-2231 ext. 1250 GENERAL NOTES: 1.THIS PLAN SET IS FOR PERMITTING ONLY AND NOT FOR CONSTRUCTION. 2.SURVEY CONDUCTED BY HORSLEY WITTEN GROUP (HW) IN FEBRUARY, 2024. ELEVATION DATUM IS NAVD 88. 3.PROPERTY LINES APPROXIMATE ONLY. 4.ABUTTER INFORMATION FROM ASSESSOR'S MAP. 5.SITE INFORMATION: MAP 101 LOT 196 ADDRESS:CURVE HILL ROAD ZONING DISTRICT:RESIDENTIAL 7.THE WETLAND DELINEATION SHOWN HEREON WAS CONDUCTED BY HORSLEY WITTN GROUP, INC. IN NOVEMBER 2023. SEPTEMBER 2024 GLK GSG RAC 113 R2 Water StreetExeter, NH 03833Phone: (603) 658-1660 YARMOUTH SITE 0 12000 1:12000 0 150000 1:150000 1C - PERMITTING SET ONLY NOT FOR CONSTRUCTION 2 7ofRevisions Appr.Rev.DateByDescription1234567NOTES AND LEGENDSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 125022108 last modified: 09/17/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD CV.dwgSEPTEMBER 2024GLKGSGRACChecked By:Designed By:Date:Drawn By: Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6A, Unit 1Sandwich, MA 02563Phone: (508) 833-6600Fax: (508) 833-3150Horsley Witten Group, Inc.2C - GENERAL CONSTRUCTION NOTES: 1.ALL SITE WORK TO COMPLETE THIS PROJECT, AS INDICATED ON THE DRAWINGS, IN THE SPECIFICATIONS AND AS DESCRIBED BELOW IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR. 2.IMMEDIATELY CONTACT AND COORDINATE WITH THE ENGINEER AND OWNER IF ANY DEVIATION OR ALTERATION OF THE WORK PROPOSED ON THESE DRAWINGS IS REQUIRED. 3.UTILIZE ALL PRECAUTIONS AND MEASURES TO ENSURE THE SAFETY OF THE PUBLIC, ALL PERSONNEL AND PROPERTY DURING CONSTRUCTION IN ACCORDANCE WITH OSHA STANDARDS, INCLUDING THE INSTALLATION OF TEMPORARY FENCING BARRICADES, CONES,POLICE DETAIL AND/OR FLAGMEN AS DETERMINED NECESSARY BY THE TOWN OF YARMOUTH. THE CONTRACTOR IS RESPONSIBLE FORTHE COST OF POLICE DETAIL AND FOR COORDINATING WITH THE LOCAL OR STATE POLICE DEPARTMENT FOR ALL REQUIRED POLICE DETAIL. 4.MAKE ALL NECESSARY CONSTRUCTION NOTIFICATIONS AND APPLY FOR AND OBTAIN ALL NECESSARY CONSTRUCTION PERMITS, PAY ALL FEES INCLUDING POLICE DETAILS AND POST ALL BONDS, IF NECESSARY, ASSOCIATED WITH THE SAME, AND COORDINATE WITH THEOWNER AND THE ENGINEER. 5.ALL EXISTING CONDITIONS SHOWN ARE APPROXIMATE AND ARE BASED ON THE BEST INFORMATION AVAILABLE. PRIOR TO THE START OFCONSTRUCTION VERIFY THAT THE PROPOSED IMPROVEMENTS SHOWN ON THE PLANS DO NOT CONFLICT WITH ANY KNOWN EXISTING OROTHER PROPOSED IMPROVEMENTS. IF ANY CONFLICTS ARE DISCOVERED, NOTIFY THE OWNER AND THE ENGINEER PRIOR TO INSTALLING ANY PORTION OF THE SITE WORK WHICH WOULD BE AFFECTED. 6.THE LOCATION AND/OR ELEVATION OF EXISTING UTILITIES AND STRUCTURES AS INDICATED ON THE DRAWINGS ARE BASED ON RECORDS OF VARIOUS UTILITY COMPANIES, AND WHEREVER POSSIBLE, MEASUREMENTS TAKEN IN THE FIELD. THIS INFORMATION IS NOT TO BERELIED UPON AS BEING EXACT OR COMPLETE. VERIFY THE LOCATION OF ALL UNDERGROUND UTILITIES AND STRUCTURES IN THE FIELDPRIOR TO THE START OF CONSTRUCTION. CONTACT THE APPROPRIATE UTILITY COMPANY, ANY GOVERNING PERMITTING AUTHORITY INTHE TOWN OF YARMOUTH, AND "DIGSAFE" (1-888-344-7233) AT LEAST THREE BUSINESS DAYS PRIOR TO ANY EXCAVATION WORK TO REQUEST EXACT FIELD LOCATION OF UTILITIES. THE CONTRACTOR MUST RESOLVE CONFLICTS BETWEEN THE PROPOSED UTILITIES ANDFIELD-LOCATED UTILITIES AND REPORT ANY DISCREPANCIES TO THE ENGINEER IMMEDIATELY. THE ENGINEER ASSUMES NORESPONSIBILITY FOR DAMAGES INCURRED AS A RESULT OF UTILITIES OMITTED, INCOMPLETELY OR INACCURATELY SHOWN. THE CONTRACTOR MUST MAINTAIN ACCURATE RECORDS OF THE LOCATION AND ELEVATION OF ALL WORK INSTALLED AND EXISTING UTILITIESFOUND DURING CONSTRUCTION FOR THE PREPARATION OF THE AS-BUILT PLAN. 7.MAINTAIN ALL EXISTING UTILITIES IN WORKING ORDER AND FREE FROM DAMAGE DURING THE ENTIRE DURATION OF THE PROJECT.REPAIR ANY DAMAGE TO EXISTING UTILITY LINES OR STRUCTURES INCURRED DURING CONSTRUCTION OPERATIONS AT NO COST TO THEOWNER. THE CONTRACTOR IS RESPONSIBLE FOR ALL COST RELATED TO THE REPAIR OF UTILITIES. EXCAVATION REQUIRED WITHIN THE PROXIMITY OF EXISTING UTILITY LINES MUST BE DONE BY HAND. 8.COORDINATE ALL TRENCHING WORK WITHIN ROADWAYS WITH THE PROPER LOCAL & STATE AGENCY. THE CONTRACTOR IS RESPONSIBLE FOR ALL TRENCH SAFETY INCLUDING ANY LOCAL AND/OR STATE PERMITS REQUIRED FOR THE TRENCH WORK. IF THIS WORK IS REQUIREDTO OCCUR OUTSIDE THE AGREED UPON HOURS OF OPERATION FOR THE FACILITY, THE CONTRACTOR MUST PLAN ACCORDINGLY. 9.SAWCUT ALL TRENCH WORK WITHIN EXISTING PAVEMENT AS INDICATED ON THE DRAWINGS. BACKFILL AND COMPACT TRENCH WORK ASINDICATED ON THE DRAWING AND IN THE SPECIFICATIONS. IF SETTLEMENT OCCURS DUE TO INADEQUATE COMPACTION, AS DETERMINEDBY THE ENGINEER, WITHIN THE WARRANTY PERIOD, CONTRACTOR IS REQUIRED TO REMOVE, PATCH AND REPAVE AFTER ONE COMPLETE12-MONTH CYCLE. 10.ESTABLISH AND MAINTAIN ALL CONTROL POINTS AND BENCHMARKS DURING CONSTRUCTION INCLUDING BENCHMARK LOCATIONS ANDELEVATIONS AT CRITICAL AREAS. COORDINATE WITH THE ENGINEER THE LOCATION OF ALL CONTROL POINTS AND BENCHMARKS. 11.SITE LAYOUT SURVEY REQUIRED FOR CONSTRUCTION MUST BE PROVIDED BY THE CONTRACTOR AND PERFORMED BY AMASSACHUSETTS' REGISTERED PROFESSIONAL LAND SURVEYOR. THE CONTRACTOR IS RESPONSIBLE FOR COORDINATING WITH THE SURVEYOR FOR ALL SITE SURVEY WORK. 12.MAINTAIN ALL GRADE STAKES SET BY THE SURVEYOR. GRADE STAKES ARE TO REMAIN UNTIL A FINAL INSPECTION OF THE ITEM HAS BEEN COMPLETED BY THE ENGINEER. RE-STAKING OF PREVIOUSLY SURVEYED SITE FEATURES IS THE RESPONSIBILITY (INCLUDING COST) OFTHE CONTRACTOR. 13.UNLESS OTHERWISE INDICATED ON THE DRAWINGS AND/OR IN THE SPECIFICATIONS, ALL SITE CONSTRUCTION MATERIALS ANDMETHODOLOGIES ARE TO CONFORM TO THE MOST RECENT VERSION OF THE MASSACHUSETTS DEPARTMENT OF TRANSPORTATIONSTANDARD SPECIFICATIONS. 14.PROVIDE ALL CONSTRUCTION SERVICE IN ACCORDANCE WITH APPLICABLE LAWS AND REGULATIONS REGARDING NOISE, VIBRATION,DUST, SEDIMENTATION CONTAINMENT, AND TRENCH WORK. 15.COLLECT SOLID WASTES AND STORE IN A SECURED DUMPSTER. THE DUMPSTER MUST MEET ALL LOCAL AND STATE SOLID WASTEMANAGEMENT REGULATIONS. 16.RESTORE ALL SURFACES EQUAL TO THEIR ORIGINAL CONDITION AFTER CONSTRUCTION IS COMPLETE PER SPECIFICATIONS. LEAVE ALLAREAS NOT DISTURBED BY CONSTRUCTION IN THEIR NATURAL STATE. TAKE CARE TO PREVENT DAMAGE TO SHRUBS, TREES, OTHER LANDSCAPING AND/OR NATURAL FEATURES. WHEREAS THE PLANS DO NOT SHOW ALL LANDSCAPE FEATURES, EXISTING CONDITIONSMUST BE VERIFIED BY THE CONTRACTOR IN ADVANCE OF THE WORK. 17.REGULARLY INSPECT THE PERIMETER OF THE PROPERTY TO CLEAN UP AND REMOVE LOOSE CONSTRUCTION DEBRIS BEFORE IT LEAVESTHE SITE. PROMPTLY REMOVE ALL DEMOLITION DEBRIS FROM THE SITE TO AN APPROVED DUMP SITE. 18.ALL TRUCKS LEAVING THE SITE MUST BE COVERED. 19.DO NOT WASH ANY CONCRETE TRUCKS ONSITE. REMOVE BY HAND ANY CEMENT OR CONCRETE DEBRIS LEFT IN THE DISTURBED AREA. 20.BURIAL OF ANY STUMPS, SOLID DEBRIS, AND/OR STONES/BOULDERS ONSITE IS PROHIBITED. DO NOT USE ROAD SALT OR OTHER DE-ICINGCHEMICALS ON THE ACCESS ROADWAY. 21.AT THE END OF CONSTRUCTION, REMOVE ALL CONSTRUCTION DEBRIS AND SURPLUS MATERIALS FROM THE SITE. PERFORM A THOROUGHINSPECTION OF THE WORK PERIMETER. COLLECT AND REMOVE ALL MATERIALS AND BLOWN OR WATER CARRIED DEBRIS FROM THE SITE. BASIC CONSTRUCTION SEQUENCE: THE FOLLOWING CONSTRUCTION SEQUENCE IS TO BE USED AS A GENERAL GUIDELINE. COORDINATE WITH THE OWNER, ENGINEERS AND LANDSCAPE ARCHITECT AND SUBMIT A PROPOSED CONSTRUCTION SEQUENCE FOR REVIEW AND APPROVALPRIOR TO CONSTRUCTION. 1.SURVEY AND STAKE THE PROPOSED LIMIT OF DISTURBANCE AND LIMIT OF SEDIMENTATION BARRIERS. 2.PLACE SEDIMENTATION BARRIERS AS INDICATED ON DRAWINGS AND STAKED OUT IN THE FIELD. UNDER NOCIRCUMSTANCES IS THE LIMIT OF WORK TO EXTEND BEYOND THE SEDIMENTATION BARRIERS/LIMIT OF DISTURBANCE ASINDICATED ON DRAWINGS AS APPROVED BY THE LOCAL CONSERVATION COMMISSION AND DEPARTMENT OFENVIRONMENTAL PROTECTION (DEP). 3.INSTALL TEMPORARY CONSTRUCTION ENTRANCES IN LOCATIONS INDICATED ON DRAWINGS. NO OTHER ENTRANCESARE TO BE USED TO GAIN ACCESS TO THE SITE BY ANY CONSTRUCTION OR DELIVERY VEHICLES. 4.BEGIN SITE PREPARATION, CLEARING AND DEMOLITION AS REQUIRED. BEGIN CLEARING AND GRUBBING THE AREAS OFSTORMWATER MANAGEMENT AREAS. TOPSOIL IS TO BE STRIPPED FROM THE AREA OF THE PROPOSED ROADWAYS AND STORMWATER MANAGEMENT AREAS AND STOCKPILED IN APPROVED LOCATIONS. TOPSOIL STOCKPILES MUST BEPROTECTED BY A SEDIMENT BARRIER 5.SURVEY AND STAKE OUTLINE OF THE STORMWATER MANAGEMENT AREAS CENTERLINE OF DRAINAGE LINES. 6.EXCAVATE AND ROUGH GRADE THE PROPOSED STORMWATER MANAGEMENT AREAS AND ANY ADDITIONAL TEMPORARY BASINS NECESSARY TO CONTROL SITE RUNOFF, SEDIMENTS, AND DEWATERING. TEMPORARILY STABILIZE/SEEDPERMANENT STORMWATER MANAGEMENT AREAS AS NECESSARY TO REDUCE SIDE SLOPE EROSION AND SEDIMENTACCUMULATION. 7.INSTALL TEMPORARY CONVEYANCE DEVICES (SWALES, PIPES, STABILIZATION, ETC.) AS NECESSARY TO CONVEY RUNOFFOR DEWATERING TO TREATMENT AREAS. 8.INSTALL DRAINAGE PIPES, DRAINAGE MANHOLES, CATCH BASINS, AND UNDERGROUND DRAINAGE STRUCTURES. BEGIN WORK AT THE STORMWATER MANAGEMENT AREAS AND PROGRESS UP-GRADIENT. PROTECT DISCHARGE OUTLETS WITHRIP-RAP APRONS. THE STORMWATER MANAGEMENT AREA(S) AND DRAINAGE NETWORK ARE TO BE PROTECTED FROMSEDIMENTATION UNTIL ALL UN-STABILIZED AREAS ARE STABILIZED WITH STONE SUB-BASE OR VEGETATION. INSTALL SEDIMENT BARRIERS/INLET PROTECTION AT ALL POINTS OF ENTRY INTO THE DRAINAGE NETWORK. TAKE PARTICULARCARE TO PROTECT THE UNDERGROUND STRUCTURES FROM SEDIMENT. 9.FINAL PAVING IS NOT TO OCCUR UNTIL THE ENTIRE PERMANENT DRAINAGE SYSTEM HAS BEEN INSTALLED AND ALL PIPECONNECTIONS COMPLETE. 10.FINISH PERMANENT STABILIZATION. COMPLETE PERMANENT STORMWATER MANAGEMENT AREA SEEDING AND PLANTINGAFTER THE CONTRIBUTING AREA TO THE BASIN HAS REACHED A MINIMUM OF 80% STABILIZATION AND IS NO LONGERREQUIRED AS A CONSTRUCTION SEDIMENTATION BASIN. 11.COMPLETE ALL REMAINING PLANTING AND SEEDING. 16.SWEEP THE ROADWAY TO REMOVE ALL SEDIMENTS. REPAIR DRAINAGE OUTLETS AND BASINS AS REQUIRED. CLEAN ANDFLUSH THE DRAINAGE STRUCTURES AND PIPES AT THE END OF CONSTRUCTION AND REMOVE ALL ACCUMULATEDSEDIMENTS IN THE STORMWATER MANAGEMENT AREAS. CONTRACTOR MUST INSPECT THE DRAINAGE NETWORK AND REPAIR ANY DAMAGE IMMEDIATELY. 17.ENGINEER TO APPROVE THE REMOVAL OF ALL TEMPORARY SOIL EROSION AND SEDIMENTATION CONTROL MEASURES FOLLOWING VEGETATIVE ESTABLISHMENT OF ALL DISTURBED AREAS AND DETERMINE WHEN THE CONTRIBUTING AREA HAS REACHED A MINIMUM OF 80% STABILIZATION. GENERAL GRADING AND DRAINAGE NOTES: 1.ALL CUT AND FILL SLOPES SHALL BE 3:1 OR FLATTER UNLESS OTHERWISE NOTED. 2.EXISTING GRADE CONTOUR INTERVALS SHOWN AT 1 FOOT. 3.PROPOSED GRADE CONTOUR INTERVALS SHOWN AT 1 FOOT. 4.ADJUST AND/OR CUT EXISTING PAVEMENT AS NECESSARY TO ASSURE A SMOOTH FIT AND CONTINUOUS GRADE. 5.PROPOSED ELEVATIONS ARE SHOWN TO FINISH PAVEMENT OR GRADE UNLESS NOTED OTHERWISE. 6.ALL EARTHWORK AND SITE PREPARATION MUST BE DONE IN STRICT ACCORDANCE WITH THE RECOMMENDATIONS OFANY SUBSURFACE INVESTIGATION OR GEOTECHNICAL REPORTS PREPARED FOR THIS SITE. 7.ALL DRAINAGE STRUCTURES AND PIPES MUST BE CONNECTED TO THE DRAINAGE SYSTEM PRIOR TO THE INSTALLATIONOF ANY PAVEMENT. PAVING WILL NOT BE ALLOWED IF THE DRAINAGE SYSTEM FOR THE PROPOSED PAVED AREA IS NOTCOMPLETELY AND PROPERLY INSTALLED. THIS INCLUDES THE STABILIZATION OF ALL DISTURBED AREAS CONTRIBUTING TO THE DRAINAGE SYSTEMS AND ANY STORMWATER BASIN FLOORS AND SIDE SLOPES. STORMWATER FACILITY OPERATION & MAINTENANCE: THE CONTRACTOR IS RESPONSIBLE FOR THE PROPER INSPECTION AND MAINTENANCE OF ALL STORMWATER MANAGEMENT FACILITIES AS OUTLINED BELOW DURING CONSTRUCTION AND UNTIL SUCH TIME THAT THE ROADWAYS AND ASSOCIATED UTILITIES ARE ACCEPTED BY THEOWNER AND THE ENGINEER. 1.INSPECT AND RESTORE/CLEAN ALL FACILITIES (INLETS, MANHOLES, STORMWATER MANAGEMENT AREAS AS DESCRIBED BELOW OFSEDIMENT AND DEBRIS PRIOR TO THE OWNER'S ACCEPTANCE. 2.REMOVE AND DISPOSE ALL SEDIMENT AND DEBRIS TO A PRE-APPROVED LOCATION. 3.AT A MINIMUM INSPECT MONTHLY AND AFTER STORM EVENTS GREATER THAN OR EQUAL TO 1" OF RAINFALL AS NECESSARY FOR THE ENTIREDURATION OF THE CONSTRUCTION PROJECT AND THE FIRST 3 MONTHS AFTER CONSTRUCTION TO ENSURE PROPER STABILIZATION. 4.SPECIFIC MAINTENANCE REQUIRED DURING CONSTRUCTION: A.DRAINAGE STRUCTURES (INLETS, MANHOLES, CATCHBASINS, DIVERSION STRUCTURE, WATER QUALITY UNITS): MONITOR AND REGULARLY INSPECT ALL EXISTING AND PROPOSED DRAINAGE STRUCTURES FOR PROPER OPERATION, COLLECTION OF LITTER ORTRASH, AND STRUCTURAL DETERIORATION. CLEAN AND REMOVE SEDIMENT FRO THE STRUCTURES (INCLUDING SUMPS) ASNECESSARY, AND REPAIR WHEN REQUIRED. B.RIP-RAP SLOPE PROTECTION: MONITOR, REGULARLY INSPECT AND REPAIR AS NECESSARY. C.CONSTRUCTED WETLAND SYSTEM: MONITOR AND INSPECT STRUCTURAL COMPONENTS OF THE SYSTEM, INCLUDING ORIFICE STRUCTURES, DRAINAGE INLETS, TRASH CHECK RACKS, PIPES, AND SPILLWAY STRUCTURES, FOR PROPER FUNCTION. CLEAN AND REPAIR ANY CLOGGED OPENINGS IDENTIFIED DURING INSPECTIONS. FOR PROPER OPERATION. REMOVE SEDIMENT OR ORGANICBUILD-UP FROM THE CONSTRUCTED WETLAND AS NEEDED FOR PROPER OPERATION. REMOVE AND REPLACE ILL-ESTABLISHED,DEAD OR SEVERELY DISEASED PLANTS. PRUNE AND REMOVE FROM THE SITE ANY INVASIVE VEGETATION ENCROACHING UPON THE PERIMETER OF THE FACILITY. CHECK EMBANKMENTS FOR STABILITY AND REMOVE ANY BURROWING ANIMALS. RE-VEGETATE PERTHE PLANTING DESIGN ALL BARREN AREAS WITHIN THE EXTENTS OF THE FACILITY. D.ROUTINE MAINTENANCE: OTHER ROUTINE MAINTENANCE INCLUDES THE REMOVAL OF TRASH AND LITTER FROM PAVED ANDPERIMETER AREAS, AND STREET AND PARKING LOT SWEEPING UPON COMPLETION OF CONSTRUCTION TO AVOID EXCESSIVEACCUMULATION OF SEDIMENT IN THE DRAINAGE SYSTEM. INSPECT THE PIPES AND STRUCTURES FOR SEDIMENT ACCUMULATIONAND PROPER FLOW. EROSION & SEDIMENT CONTROL NOTES: 1.DESIGNATE THE SITE CONSTRUCTION FOREMAN AS THE ON-SITE PERSONNEL RESPONSIBLE FOR THE DAILY INSPECTION AND MAINTENANCE OF ALL SEDIMENT AND EROSION CONTROLS AND IMPLEMENTATION OF ALL NECESSARY MEASURES TO CONTROL EROSIONAND PREVENT SEDIMENT FROM LEAVING THE SITE. 2.INSTALL ALL EROSION AND SEDIMENT CONTROL (ESC) MEASURES AS INDICATED ON DRAWINGS IN CONSULTATION WITH THECONSERVATION AGENT, AND ENGINEER BEFORE ANY CONSTRUCTION ACTIVITIES BEGIN. INSPECT, MAINTAIN REPAIR AND REPLACEEROSION CONTROL MEASURES, AS NECESSARY, DURING THE ENTIRE CONSTRUCTION PERIOD OF THE PROJECT. THE SITE PERIMETER EROSION CONTROLS ARE THE DESIGNATED LIMIT OF WORK. INFORM ALL PERSONNEL WORKING ON THE PROJECT SITE THAT NOCONSTRUCTION ACTIVITY IS TO OCCUR BEYOND THE LIMIT OF WORK AT ANY TIME THROUGHOUT THE CONSTRUCTION PERIOD. 3.MAINTAIN A MINIMUM SURPLUS OF 100 FEET OF EROSION CONTROL BARRIER (SILT SOCK) ONSITE AT ALL TIMES. 4.PROTECT THE EXISTING DRAINAGE INFRASTRUCTURE FROM SEDIMENTATION DURING PROJECT CONSTRUCTION UNTIL ACCEPTANCE BY THE OWNER & IN CONFORMANCE WITH THE ORDER OF CONDITIONS. 5.PROTECT THE ADJACENT RESOURCE AREA FROM SEDIMENTATION DURING PROJECT CONSTRUCTION UNTIL ACCEPTANCE BY THE OWNER & IN CONFORMANCE WITH THE ORDER OF CONDITIONS. 6.PROVIDE CONSTRUCTION EXITS AS INDICATED ON DRAWINGS TO SHED DIRT FROM CONSTRUCTION VEHICLE TIRES. CLEAN AND/OR REPLACE THE CRUSHED STONE PAD, AS NECESSARY, TO MAINTAIN ITS EFFECTIVENESS. 7.KEEP THE LIMIT OF CLEARING, GRADING AND DISTURBANCES TO A MINIMUM WITHIN THE PROPOSED AREA OF CONSTRUCTION. PHASE THE SITE WORK IN A MANNER TO MINIMIZE AREAS OF EXPOSED SOIL. IF TREES ARE TO BE CUT ON THE ENTIRE SITE, CLEAR AND GRUBONLY THOSE AREAS WHICH ARE ACTIVELY UNDER CONSTRUCTION. PROPERLY INSTALL THE SEDIMENTATION CONTROLS PRIOR TOBEGINNING ANY LAND CLEARING ACTIVITY AND/OR OTHER CONSTRUCTION RELATED WORK. 8.MONITOR LOCAL WEATHER REPORTS DURING CONSTRUCTION AND PRIOR TO SCHEDULING EARTHMOVING OR OTHER CONSTRUCTIONACTIVITIES WHICH LEAVE LARGE DISTURBED AREAS UNSTABILIZED. IF INCLEMENT WEATHER IS PREDICTED, USE BEST PROFESSIONALJUDGEMENT AND GOOD CONSTRUCTION PRACTICES WHEN SCHEDULING CONSTRUCTION ACTIVITIES AND ENSURE THE NECESSARY EROSION CONTROL DEVICES ARE INSTALLED AND FUNCTIONING PROPERLY TO MINIMIZE EROSION FROM ANY IMPENDING WEATHEREVENTS. 9.INSPECT EROSION AND SEDIMENT CONTROL DEVICES AND STABILIZED SLOPES ON A WEEKLY BASIS AND AFTER EACH RAINFALL EVENTOF .25 INCH OR GREATER. REPAIR IDENTIFIED PROBLEMS WITHIN 24 HOURS TO ENSURE EROSION AND SEDIMENT CONTROLS ARE INGOOD WORKING ORDER. RESET OR REPLACE MATERIALS AS REQUIRED. 10.SURROUND THE PERIMETER OF SOIL STOCKPILES WITH SILT SOCK, SILT FENCE, STRAWBALES, OR A COMBINATION OF SILT FENCE WITHSTRAWBALE, AS DETERMINED NECESSARY. 11.DISTURBED AREAS AND SLOPES MUST NOT BE LEFT UNATTENDED OR EXPOSED FOR EXCESSIVE PERIODS OF TIME SUCH AS THEINACTIVE WINTER SEASON. PROVIDE APPROPRIATE STABILIZATION PRACTICES ON ALL DISTURBED AREAS AS SOON AS POSSIBLE BUT NOT MORE THAN 14 DAYS AFTER THE CONSTRUCTION ACTIVITY IN THAT AREA HAS TEMPORARILY OR PERMANENTLY CEASED,REINFORCE TEMPORARY AREAS HAVING A SLOPE GREATER THAN 4:1 WITH EROSION BLANKETS OR APPROVED EQUAL UNTIL THE SITE ISPROPERLY STABILIZED. TEMPORARY SWALES MAY ALSO BE REQUIRED IF DETERMINED NECESSARY IN THE FIELD BY THE ENGINEER. 12.INSTALL A SILT SACK OR APPROVED EQUIVALENT IN EACH EXISTING DRAIN BASIN RECEIVING RUNOFF FROM THE SITE. UPON THEINSTALLATION OF EACH NEW DRAIN BASIN, INSTALL A SILT SACK OR APPROVED EQUIVALENT. INSPECT SILT SACKS, AFTER EACH SIGNIFICANT STORM EVENT AND REMOVE AND EMPTY AS NEEDED FOR THE DURATION OF THE CONSTRUCTION PERIOD. 13.TEMPORARY SEDIMENTATION BASINS AND SWALES WILL BE CONSTRUCTED ON AN AS-NEEDED BASIS DURING CONSTRUCTION TO AID IN THE CAPTURE OF SITE RUNOFF AND SEDIMENT. IT WILL BE THE RESPONSIBILITY OF THE SITE CONTRACTOR, IN CONSULTATION WITH THEENGINEER, TO SIZE AND CREATE THESE BASINS IN APPROPRIATE LOCATIONS. 14.CONTAIN ALL SEDIMENT ONSITE. SWEEP ALL EXITS FROM THE SITE AS NECESSARY INCLUDING ANY SEDIMENT TRACKING. SWEEP PAVEDAREAS AS NEEDED TO REMOVE SEDIMENT AND POTENTIAL POLLUTANTS ACCUMULATED DURING SITE CONSTRUCTION. 15.REGULARLY REMOVE ACCUMULATED SEDIMENT FROM ALL TEMPORARY PRACTICES AND AFTER RAIN EVENTS TO MAINTAIN PROPER DRAINAGE. DISPOSE OF IN A PRE-APPROVED LOCATION. 16.PROVIDE ON SITE OR MAKE READILY AVAILABLE THE NECESSARY EQUIPMENT AND SITE PERSONNEL DURING CONSTRUCTION HOURS FOR THE DURATION OF THE PROJECT TO ENSURE ALL EROSION AND SEDIMENTATION CONTROL DEVICES ARE PROPERLY MAINTAINED ANDREPAIRED IN A TIMELY AND RESPONSIBLE MANNER. IF SITE WORK IS SUSPENDED DURING THE WINTER MONTHS THE CONTRACTOR MUSTCONTINUE TO PROVIDE PERSONNEL AND EQUIPMENT EITHER ON SITE OR READILY AVAILABLE TO PROPERLY MAINTAIN AND REPAIR ALL EROSION AND SEDIMENTATION CONTROL DEVICES IN A TIMELY AND RESPONSIBLE MANNER 17.CONTROL DUST BY WATERING OR OTHER APPROVED METHODS AS NECESSARY, OR AS DIRECTED BY THE ENGINEER. 18.THE CONTRACTOR IS RESPONSIBLE FOR THE INSPECTION AND MAINTENANCE DURING CONSTRUCTION OF ALL STORMWATER FACILITIESINSTALLED OR AFFECTED BY THE PROJECT. REMOVE SEDIMENT OR DEBRIS COLLECTED WITHIN THESE FACILITIES AS REQUIRED FOR PROPER FUNCTION AND CONTROL OF SITE RUNOFF DURING CONSTRUCTION AND PRIOR TO THE OWNER'S ACCEPTANCE. LEGEND: CONTOUR - MAJOR PAVEMENT CENTERLINE BERM CONTOUR - MINOR WOODEN GUARDRAIL 44 50 LIMIT OF WORK SS SILT SOCK SYMBOLS WF BOULDER EXISTING TREE SIGN EXISTING SPOT GRADE TEST PIT WETLAND FLAG TP EL:98.45 PROPOSED SPOT GRADEEL:95.00 ENVIRONMENTAL 44 50 PROPOSED GENERAL EXISTING TREE LINE CURB X X VISIBILITY FENCE CONSTRUCTION FENCE PAVEMENT REMOVAL UTILITIES SF SILT FENCE WATER VALVE UTILITY POLE WV FIRE HYDRANT HY D SAWCUT POROUS PAVEMENT WALL - RETAINING FENCE - WOOD FENCE - CHAIN LINK WALL - STONE GV STONE BENCHMARK LIGHT POST GAS VALVE SEWER MANHOLE CATCHBASIN GUY S PROPERTY LINE BOUNDARYCB PROPERTY INFORMATION MAIL BOX GUARD RAIL D DRAIN MANHOLE 100' BUFFER TO BVW UNDISTURBED 50' BUFFER TO BVW BORDERING VEGETATED WETLAND (BVW) UNDISTURBED 35' BUFFER TO BVW OVERHEAD WIRE WATER LINE GAS LINE DRAIN PIPE RIPRAP WV PERMITTING SET ONLY NOT FOR CONSTRUCTION DEWATERING NOTES: 1.SUPPLY THE DEWATERING SYSTEMS TO: A.DEWATER AREAS USING A SYSTEM OF PUMPS AND PIPES; B.DEVELOP A SUBSTANTIALLY DRY AND STABLE SUBGRADE FOR THE PROPOSED WORK;C.PREVENT DAMAGE TO ADJACENT PROPERTIES, BUILDINGS, STRUCTURES, UTILITIES AND RESOURCES AREAS;D.RETAIN ALL SEDIMENTS ON-SITE WITHIN THE WORK AREA;E.PREVENT SEDIMENT DISCHARGE AND DEGRADATION OF THE RESOURCE AREA;. F.PREVENT LOSS OF FINES, QUICK CONDITION, OR SOFTENING OF FOUNDATION SUBGRADE;G.DISCHARGE SUITABLE WATER IN STORM DRAIN SYSTEM OUTLET LOCATED AT "NEW GATEWAY", AS SHOWN INPLANS (SHEET C-10); AND 2.MAINTAIN STABILITY OF SIDES AND BOTTOMS OF EXCAVATIONS AND TRENCHES.FURNISH ALL MATERIAL/PRODUCTSREQUIRED TO ADEQUATELY DEWATER THE WORK AREA WITHOUT DAMAGE TO SURROUNDING PROPERTIES, EXISTINGUTILITIES, AND RESOURCE AREA. 3.SUBMIT ALL PRODUCTS AND MATERIALS TO THE ENGINEER FOR REVIEW AND APPROVAL PRIOR TO INSTALLATION OF THEDEWATERING SYSTEM AND MUST INCLUDE AT A MINIMUM THE FOLLOWING INFORMATION: A.SCHEDULE OF DEWATERING PROCEDURES.B.THE PROPOSED TYPES OF DEWATERING SYSTEM.C.ARRANGEMENT, LOCATION AND DEPTHS OF SYSTEM COMPONENTS. D.COMPLETE DESCRIPTION OF EQUIPMENT AND INSTRUMENTATION TO BE USED INCLUDING INSTALLATION,OPERATION AND MAINTENANCE PROCEDURES.E.DESIGN CALCULATIONS DEMONSTRATING ADEQUACY OF THE PROPOSED SYSTEM AND EQUIPMENT.F.PROVISIONS AND METHODS OF SEDIMENT REMOVAL AND DISCHARGE OF CLEAN WATER. E.TYPES AND SIZES OF FILTERS (IF APPLICABLE).F.PROPOSED STAGING AND LAYOUT PLANS FOR DEWATERING WORK AREAS.G.ALL PERMITS REQUIRED FOR THE WORK, IF NECESSARY. 4.DEWATERING SCHEDULE AND PROCEDURES MAY BE SUBJECT TO THE LOCAL AUTHORITY AND ENGINEER'S REVIEW ANDAPPROVAL. 2.LOCATE DEWATERING FACILITIES WHERE THEY WILL NOT INTERFERE WITH CONSTRUCTION WORK OR ABUTTINGRESOURCES OR PROPERTIES. 3.MODIFY DEWATERING EQUIPMENT SYSTEM AS NECESSARY TO MAINTAIN AND PROCEDURES WHEN OPERATIONSTHREATEN TO CAUSE DAMAGE TO NEW OR EXISTING FACILITIES OR ADJACENT AREAS NOT WITHIN THE LIMIT OF WORK. 4.CONDUCT WORK 24 HOURS OR MORE PRIOR TO A FORECAST STORM. 5.STAGE WORK SUCH THAT DEWATERING SYSTEM IS ACTIVE FOR ONLY ONE WORK AREA AT A GIVEN TIME. DEWATEREDWORK AREAS SHALL BE NO LARGER THAN 20,000 SF (0.45 AC). 6.INTERCEPT AND DIVERT SURFACE WATER RUNOFF AWAY FROM EXCAVATIONS THROUGH THE USE OF DIKES, CURBWALLS, DITCHES, PIPES, SUMPS OR OTHER APPROVED MEANS. 7.IF PUMPS ARE USED, THE PUMP INTAKE LINE SHOULD NOT BE ALLOWED TO SETTLE TO THE BOTTOM OF THE EXCAVATIONOR DEWATERING SUMP. 8.PROVIDE AND MAINTAIN HOLDING AREAS/TEMPORARY SETTLING BASINS OF ADEQUATE SIZE TO COLLECT AND PREVENTSURFACE AND SUBSURFACE WATER SEEPAGE FROM ENTERING THE EXCAVATIONS. DIVERT THE WATER TO SETTLINGBASINS OR OTHER APPROVED EQUIPMENT REQUIRED TO REDUCE THE AMOUNT OF FINE PARTICLES BEFORE DISCHARGE INTO DRAINAGE PIPES AND NATURAL WATER COURSES. IF A DRAINAGE SYSTEM OR WATER COURSE BECOMES BLOCKEDDUE TO DEWATERING OPERATION, IT MUST BE CLEANED BY THE CONTRACTOR AT NO ADDITIONAL COST TO THE OWNER.ANY ENFORCEMENT ACTIONS OR FINES RESULTING FROM IMPROPER DEWATERING AND/OR DISCHARGE OF TURBIDWATER AND SEDIMENT TO PROTECTED AREAS ARE THE SOLE RESPONSIBILITY OF THE CONTRACTOR. ACCOMPLISH DEWATERING IN ACCORDANCE WITH THE MEANS AND METHODS SUBMITTED AND APPROVED BY THEENGINEER. KEEP THE ENGINEER ADVISED OF ANY CHANGES REQUIRED TO ACCOMMODATE FIELD CONDITIONS AND, ON COMPLETION OF THE DEWATERING SYSTEM INSTALLATION, REVISE AND RESUBMIT THE INFORMATION REQUIRED TOSHOW THE INSTALLED SYSTEM. H.PERFORM DEWATERING OPERATIONS TO LOWER THE GROUNDWATER LEVEL IN EXCAVATIONS AS REQUIRED TOPROVIDE A STABLE, DRY SUBGRADE FOR THE PROSECUTION OF THE PROPOSED WORK. I.MAINTAIN DEWATERING OPERATIONS IN A MANNER THAT PREVENTS BUILDUP OF EXCESSIVE HYDROSTATICPRESSURE AND DAMAGE TO STRUCTURES, AND THE SUBGRADE. J.DO NOT ALLOW WATER TO ACCUMULATE IN EXCAVATIONS. CONTRACTOR SHALL PROVIDE AND MAINTAIN AT ALLTIMES AMPLE MEANS AND DEVICES TO REMOVE PROMPTLY, AND TO DISPOSE OF PROPERLY, ALL WATERENTERING EXCAVATIONS AND TO KEEP THEM DRY UNTIL THE PROPOSED WORK IS COMPLETED. K.DO NOT DISCHARGE WATER TO PROTECTED ENVIRONMENTAL RESOURCES WITHOUT TREATMENT TO REMOVESUSPENDED SOLIDS AND SEDIMENTS. L.DO NOT LAY PIPE AND/OR MASONRY IN WATER. DO NOT ALLOW WATER TO INUNDATE NEW CONCRETE ANDNEW BRICK MASONRY WITHIN 48 HOURS AFTER INSTALLATION. PLACE BACKFILL PROMPTLY OR IMPLEMENTOTHER APPROVED METHODS TO PREVENT THE POSSIBILITY OF FLOTATION OF PIPE OR STRUCTURES AFTER INSTALLATION. TP 1EOP/BERM23 20 15 12 11 10 8 98910 11 2120191817 15 16 14 9 10 11 9108 9 7 7 6 10 10 11 12 13 8 7 8910 11 11 7 MAP 101 LOT 197#18 CURVE HILL RD.N/FHUNT MAP 101 LOT 198 #26 CURVE HILL RD. N/F HALL MAP 101 LOT 195 #8 CURVE HILL RD. N/F HOFFMAN MAP 101 LOT 193 #9 FOUR SEASONS DR. N/F WEINBERGER MAP 101 LOT 196CURVE HILL RD. N/F DAVENPORT TRUST15 141312 BENCHMARKSPK SET EL: 10.26 BENCHMARK MAG SET EL: 14.06 PINE-18" WF BVW 103 WF BVW 104 12" PINE-18" PINE-18" PINE-18" PINE-16" PINE-16" 12" PINE-18" 16" PINE-24" 16-PINE" PINE-16" 16"40" 12" 16" 16" 24" 20" 18" PINE-20" PINE-20" 24" 30" UP 673 MB 7 24" 16" PINE-16" 12" 24" PINE-18" 24" 18" 24" 18" 24" PAVED SWALE 100' BUFFE R T O BV W 50' UNDISTURBED BUFFER TO BVW 35' UNDISTURBE D BUFFE R T O BV W RIP RAPCURVE HILL ROADSS SS SS SS SS SS SS SS SS SS SS SSSSSS SSSSSSSSNEATLY SAWCUT AND MATCH EXISTING GRADE REMOVE TREES, TYP. (8) STAGING AND STOCKPILING AREA STONE CONSTRUCTIONENTRANCE 12.00' SILT SOCKLENGTH = 326 LF TEMPORARYCONSTRUCTION FENCELENGTH = 235 LF LIMIT OF WORK AREA = 16,830 SF R&D EXISTING DRAINAGE PIPE LENGTH = 22 LF PROTECT EXISTING TREE PAVEMENT REMOVAL AREA = 240 SF R&D ASPHALT BERM LENGTH = 40 LF ± END PIPE REMOVAL SEE GRADING ANDDRAINAGE PLAN SSSSSS DEWATERING CONTAINMENT AREA FINAL LOCATION TO BE COORDINATED WITH THE ENGINEER 3C - 3 7ofRevisions Appr.Rev.DateByDescription1234567EROSION AND SEDIMENT CONTROL PLANSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 125022108 last modified: 09/17/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD DM.dwgSEPTEMBER 2024GLKGSGRACChecked By:Designed By:Date:Drawn By:Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6A, Unit 1Sandwich, MA 02563Phone: (508) 833-6600Fax: (508) 833-3150Horsley Witten Group, Inc. (in feet) GRAPHIC SCALE 010 5 10 20 40 1 INCH = 10 FEET PERMITTING SET ONLY NOT FOR CONSTRUCTION A 10YR 3/2 MEDIUM SAND E 10YR 2/1 SANDY LOAM B 10YR 3/6 MEDIUM SAND NO MOTTLING STANDING WATER @ EL 6.0 42" 18" 4" 0"11.2 10.9 9.7 7.7 TP 1 PERFORMED BY M. LEHMANHORSLEY WITTEN GROUP, INCJANUARY 3, 2024 SOIL TEST PIT DATA C 10YR 8/1 COARSE SAND 75"5.0 7'-6" TYP. 6'-0" 1-14" GALVANIZED PIPE (TYP.) TEMPORARY CONSTRUCTION FENCE NOT TO SCALE 6" TYP.GRADE NOTES:1.TEMPORARY PLASTICE FENCE STAND WILL BE FILLED WITHSAND/CONCRETE OR GALVANIZED RECTANGULAR PIPE BASE. PLAN VIEW SECTION AREA TO BE PROTECTED NOTES:1.SILT SOCK: SILTSOXX ORIGINAL, EXTREME, NATURAL ORIGINAL, NATURAL ORIGINAL PLUS+ WITH ALL NATURAL BIODEGRADEABLE COTTON FIBER OR MULTI-FILAMENT POLYPROPYLENE (MFPP) MANUFACTURED BY FILTREXX (WWW.FILTREX.COM) OR APPROVED EQUIVALENT.2.ALL MATERIAL TO MEET MANUFACTURER'S SPECIFICATIONS.3.SEDIMENT SILT SOCK TO BE FILLED WITH LOCALLY SOURCED FILTER MEDIA (LEAF COMPOST AND/OR WOODY MULCH) PER MANUFACTURER'S REQUIREMENTS.4.FOLLOWING CONSTRUCTION AND SITE STABILIZATION, COMPOST MATERIAL TO BE REMOVED ORDISPERSED ON SITE, AS APPROVED BY THE OWNER AND/OR ENGINEER. SEDIMENT SILT SOCK NOT TO SCALE 1'-0"± 3"-4" 2" x 2" WOODEN STAKE 12" SILT SOCK SEDIMENT SILT SOCK STAKE ON 10'-0" LINEAL SPACING WATERFLOW WORK AREAAREA TO BEPROTECTED WORK AREA VISIBILITY FENCE NOT TO SCALE NOTES:1.FENCING SHALL BE ORANGE RESINET SM60 BARRIER FENCE “SNOW FENCE” OR APPROVEDEQUIVALENT. 2.POST SHALL BE HOT ROLLED RAIL STEEL AND FORMED INTO A “T”. DIMENSIONS OF “T” POST SECTION,APPROXIMATELY 1 7/16” X 1 5/16” X 1/8” X 6' (SIX FEET) LONG. THE POST SHALL BE PAINTED GREEN ORGALVANIZED. 3.THE FENCING SHALL REMAIN IN PLACE UNTIL ALL EXCAVATION HAS BEEN COMPLETED AND THE SURFACE HAS BEEN RE-ESTABLISHED.4.VISIBILITY FENCE TO BE PLACED AT TREE DRIPLINES WITHIN THE LIMIT OF WORK WHERE NOTED ONPLANS. GRADE 2'-0" TREE PROTECTION 1'-0" CLEARANCE AROUND DRIPLINESOF TREES 4'-0" VISIBILITY FENCE 6'-0" STANDARDSTEEL POST 5'-0" O.C. SITE PERIMETER SURVEY NOTES: 1.THE TOPOGRAPHY AND EXISTING SITE CONDITIONSHEREON WERE TAKEN FROM THE SURVEY PLANENTITLED "EXISTING CONDITIONS PLAN" BY HORSLEYWITTEN GROUP, INC. DATED FEBRUARY 15, 2024. SS SS SS SS SS SS SS SS SS SS SS SSSSSS SSSSSSSSD TP 1 20 15 12 11 10 8 98910 11 17 15 16 14 9 10 11 9108 9 7 7 6 10 10 8 7 8910 11 11 7 15 141312 BENCHMARKSPK SET EL: 10.26 BENCHMARK MAG SET EL: 14.06 WF BVW 103 WF BVW 104 12" PINE-18" PINE-18" PINE-18" PINE-16" PINE-16" 12" PINE-18" 16" PINE-24" 16-PINE" PINE-16" 16"40" 12" 16" 16" 24" 20" 18" PINE-20" PINE-20" 24" 30" UP 673 MB 7 24" 16" PINE-16" 12" 24" PINE-18" 24" 18" 24" 18" 24"100' BUFFE R T O BV W 50' UNDISTURBED BUFFER TO BVW 35' UNDISTURBE D BUFFE R T O BV W CURVE HILL ROADSPILLWAYCREST EL: 7.85' PERMANENT POOLEL. 7.85 3 DEEP POOL 2DEPTH = 4.85' WATER QUALITY UNIT RIM: 13.10 24" CMP INV. IN: 7.77' 18" HDPE INV. IN: 7.77' 24" HDPE INV. OUT: 7.77' LOW MARSH ZONE(6" - 18") DEEP POOL 3DEPTH = 4.85' FES 10024" INV: 7.60' 4:1 SLOPE 4:1 SLOPE 24" HDPE PIPEL= 25' 10.50 TOPO OF EMBANKMENTEL: 9.50' 6.81 4 6 665 4 3 6 5 4 HIGH MARSH ZONE (0" - 6") HIGH MARSH ZONE (0" - 6") LOW MARSH ZONE (6" - 18") HIGH MARSH ZONE (0" - 6") 9.50 9.50 9.50 9.50 9.62 9 9.50 LOW MARSH ZONE(6" - 18") BITUMINOUS PAVEMENT PATCH AREA = 266 SF CAPE COD BERMLENGTH = 27 LF (TOTAL) 13.24 13.50 CB: 100 RIM:12.80 18" INV OUT:7.87 18" HDPE L = 6' S = 1.78%131211101 0 99STABILIZED STONE OUTLET TB: 13.31 BB: 13.06 TB: 13.63 BB: 13.3813 5 8.50 8.50 9 SEE CONSTRUCTEDWETLAND PROFILE 9.50 9.50 2+70.71 0+00 1+00 2+00 PERMANENT POOL EL. 7.85 8.00' MAINTENANCE ACCESS 77 8 7 6 9.50 9.50 10 9 7.24 16.00' 7 6 7 7 7.1 TOP WIDTH 6.00' 11.20' DEEP POOL 1DEPTH = 4.35' 9.04 9.22 9.47 8 8 9 MASS STATE PLANECONSTRUCTED WETLAND PROFILE HORIZONTAL SCALE: 1" = 10' VERTICAL SCALE: 1" = 2' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0+00 0+50 1+00 1+50 2+00 2+50 2+71 LOW MARSHZONE0 - 18" DEEP POOL DEPTH = 4' - 10" DEEP POOL DEPTH = 4' - 4"DEEP POOL DEPTH = 4' - 10" PERMANENT POOL EL: 7.85' EXISTING GRADE STONE SPILLWAY EL: 7.85' WATER QUALITY TREATMENT UNIT SEE PLAN FOR INVERTS 24" HDPE L = 25' S = 0.68% 100-YR STORM EVENT EL: 8.79' BERMEL: 9.50'6.00' MIN. WIDTH FINISH GRADE STABILIZED STONE OUTLET 4:1 SLOPE CONCRETE CURB SET FLUSH WITH TOP OF SPILLWAY STONE SPILLWAY 11.20' HIGH MARSHZONE0" - 6" 9" FREEBOARD 4C - 4 7ofRevisions Appr.Rev.DateByDescription1234567SITE AND GRADING PLANSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 125022108 last modified: 09/18/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD ST.dwgSEPTEMBER 2024GLKGSGRACChecked By:Designed By:Date:Drawn By:Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6ASandwich, MA 02563508-833-6600 voice508-833-3150 faxHorsley Witten Group, Inc. (in feet) GRAPHIC SCALE 010 5 10 20 40 1 INCH = 10 FEET PERMITTING SET ONLY NOT FOR CONSTRUCTION 5 5 7ofRevisions Appr.Rev.DateByDescription1234567DRAINAGE AND SITE DETAILSSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 1250Fax: ----22108 last modified: 09/18/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD DE.dwgSEPTEMBER 2024GLKGSGRACChecked By:Designed By:Date:Drawn By: Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6A, Unit 1Sandwich, MA 02563Phone: (508) 833-6600Fax: (508) 833-3150Horsley Witten Group, Inc.C - 6 12"2'-5" 10" 6 12" 2'-1" 6 12" FLARED END SECTION (FES) NOT TO SCALE NOTES:1.PE THREADED ROD WITH WING NUTS PROVIDED FOR END SECTIONS 1'-0" - 2'-0". 2'-6" & 3-0"END SECTIONS WILL BE WELDED TO PIPE PER MANUFACTURER'S RECOMMENDATIONS. 2.ALL DIMENSIONS ARE NOMINAL.3.DRAIN PIPES LESS THAN 1'-0" IN DIAMETER WILL BE SAWCUT TO MATCH SLOPE.4.DETAIL PROVIDED BY ADVANCED DRAINAGE SYSTEMS INC. PE THREADED ROD WITH WING NUTS (SEE NOTE #1) TOP VIEW RIGHT SIDE VIEW FRONT VIEW SPILLWAY NOT TO SCALE 11' - 2" 6" 9" FLOW 6' OFFSLOPE TOE1 SECTION B-B PLAN VIEW 13' - 0" LEVEL AREA VARIES 6' 3'MIN. BERM RIM(SEE SITE ANDGRADING PLAN) B B 6" MIN. VARIESFLOW 3'MIN. A A 2' MIN. 2' MIN. 22" 13' - 0" 2 1 11' - 2" SECTION A-A SEE SITE AND GRADING PLAN APPROVED NATIVEMATERIAL 22" DEPTH OF STONED50 = 10" 34" CRUSHED STONENON-WOVEN FILTER FABRIC (MIRAFI 140NOR APPROVED EQUIV.) ENGINEER APPROVED LOW PERMEABILITY CORE MATERIAL CRESTELEV. 7.85'GROUNDSURFACE VARIES(SEE PLAN) 34"CRUSHED STONE MIRAFI 140N FILTER FARBRIC ORAPPROVED EQUIV. 3:1 MAXSIDE SLOPE (TYP.) OUTSIDE RIPAPTO BE LOAM & SEED PERSPECIFICATIONS COMPACTED ENGINEERAPPROVED FILL BERMELEV. 9.5' 2' MIN. 3 (TYP.) 1 3 (TYP.) 1 1 CREST ELEV. 7.85' BERM ELEV. 9.5' CURB CHECKDAM SET 1" ABOVE TOP OF STONE 3" 18" 16' - 0" FIBERGLASSSEPARATIONCYLINDER ANDINLET CENTER OF CDS STRUCTURE,SCREEN AND SUMP OPENING SOLIDS STORAGESUMP SEPARATIONSCREEN INLET PIPE(MULTIPLE INLET PIPES MAY BEACCOMMODATED) OUTLETPIPE PERMANENTPOOL ELEV. OIL BAFFLESKIRT 72" [1829] I.D. MANHOLESTRUCTURE TOP SLAB ACCESS(SEE FRAME ANDCOVER DETAIL) CONTRACTOR TO GROUT TOFINISHED GRADE GRADERINGS/RISERS WATER QUALITY UNIT (WQU) NOT TO SCALE ELEVATION A-A PLAN VIEW B-B 4'-0"4'-1"1'-9"2'-0"6'-9"VARIESA A B B NOTES: 1.IF SITE CONDITIONS REQUIRE A SLOPE STEEPER THAN 3:1, ALL DISTURBED AREAS ON THAT SLOPE SHALL BE PROTECTED WITH EROSION CONTROL BLANKET.2.LOAM MATERIAL: THE LOAM MATERIAL TO CONSIST OF 60-70% WASHED SCREENED SAND, 20-30% TOPSOIL,AND 10-20% ORGANIC MATTER. THE LOAM MATERIAL TO BE MIXED TO A UNIFORM CONSISTENCY. 3.TOPSOIL TO BE NATURAL, FERTILE, FRIABLE, LOAM OR SANDY LOAM TYPICAL OF CULTIVATED TOPSOIL.TOPSOIL TO BE FREE OF SUB-SOIL, LARGE STONES, EARTH CLODS, STICKS, STUMPS, CLAY LUMPS, ROOTS,OR OTHER OBJECTIONABLE MATTER. TOPSOIL TO ALSO BE FREE OF NOXIOUS WEEDS. TOPSOIL TO NOTHAVE A pH FACTOR OF LESS THAN 6.0 OR GREATER THAN 7.0 SURFACE VARIES(SEE PLAN) LOAM AND SEED FORALL DISTURBED AREA OR AS DIRECTED ONPLANTING PLAN MATCHEXISTINGGRADE (SEE PLAN) ENGINEER APPROVED LOWPERMEABILITY CORE MATERIAL 1 3 TYP 3 TYP 1 3"MIN. 3' MIN.LEVEL SURFACE 1' MIN. 2' TYP.1' MIN. 2' MIN. BERM NOT TO SCALE CONSTRUCTION SPECIFICATIONS FOR CONSTRUCTED WETLAND SYSTEMS 1.MATERIAL SPECIFICATIONS THE ALLOWABLE MATERIALS TO BE USED IN THE CONSTRUCTED WETLAND AREA ARE DETAILED IN TABLE 1. 2.PLANTING SOIL - THE PLANTING SOIL SHOULD BE AN APPROVED HIGH ORGANIC CONTENT MEDIUMTEXTURED LOAM OR SANDY CLAY LOAM, FREE OF STONES, STUMPS, ROOTS OR OTHER SIMILAROBJECTS LARGER THAN TWO INCHES. NO OTHER MATERIALS OR SUBSTANCES SHOULD BE MIXED OR DUMPED WITHIN THE CONSTRUCTED WETLAND AREA THAT MAY BE HARMFUL TO PLANT GROWTH, ORPROVE A HINDRANCE TO THE PLANTING OR MAINTENANCE OPERATIONS. THE PLANTING SOIL SHOULDBE FREE OF NOXIOUS WEEDS. THE CONSTRUCTED WETLAND SHALL UTILIZE PLANTING SOIL HAVING A COMPOSITION AS FOLLOWS:SAND:45-55%SILT:15-25% CLAY:5-15% ORGANIC MATTER: 15-20%*NOTE:ORGANIC MATTER SHALL BE WELL AGED (6-12 MONTHS), WELL AERATED, LEAF COMPOST OR APPROVED EQUIVALENT. THE PLANTING SOIL SHALL BE TESTED AND MEET THE FOLLOWING CRITERIA: PH RANGE:5.5 - 7.0 ORGANIC MATTER:9 - 21% ELECTRICAL CONDUCTIVITY:NOT TO EXCEED 4 MMHO/CM CATION EXCHANGE CAPACITY: >15 MEQ/100 GRAMS OF SOIL THE PLANTING SOIL SHALL ALSO CONTAIN MAGNESIUM, PHOSPHORUS (P2O5), & POTASSIUM (K2O) AT A STANDARD LEVEL TO FACILITATE PROPER PLANT GROWTH AS APPROVED BY THE ENGINEER ORLANDSCAPE ARCHITECT. ALL CONSTRUCTED WETLAND AREA SHOULD HAVE A MINIMUM OF ONE TEST. EACH TEST SHOULD CONSISTOF BOTH THE STANDARD SOIL TEST FOR PH, PHOSPHORUS, AND POTASSIUM AND ADDITIONAL TESTS OFORGANIC MATTER, ELECTRICAL CONDUCTIVITY, AND CATION EXCHANGE CAPACITY. A TEXTURAL ANALYSIS IS REQUIRED FROM THE SITE'S STOCKPILED TOPSOIL. IF TOPSOIL IS IMPORTED, THEN A TEXTURE ANALYSIS SHOULD BE PERFORMED FOR EACH LOCATION WHERE THE TOP SOIL WAS EXCAVATED. SINCE DIFFERENT LABS CALIBRATE THEIR TESTING EQUIPMENT DIFFERENTLY, ALL TEST RESULTS SHOULD COME FROM THE SAME TESTING FACILITY. THE TESTING RESULTS SHALL BE SUBMITTED TO THE ENGINEERFOR REVIEW AND APPROVAL. SHOULD THE PH FALL OUT OF THE ACCEPTABLE RANGE, IT MAY BE MODIFIED (HIGHER) WITH LIME OR(LOWER) WITH IRON SULFATE PLUS SULFUR. 3.FACILITY BACKFILLING - WHEN BACKFILLING THE CONSTRUCTED WETLAND, PLACE SUBGRADE SOIL INLIFTS 12" OR GREATER. PLACE A MINIMUM OF 4" OF PLANTING SOIL ABOVE SUBGRADE SOIL FORPROMOTING PLANT GROWTH. HEAVY EQUIPMENT CAN BE USED AROUND THE PERIMETER OF THE BASIN TO SUPPLY SOIL. GRADE CONSTRUCTED WETLAND MATERIALS WITH LIGHT EQUIPMENT SUCH ASA COMPACT LOADER OR A DOZER/LOADER WITH MARSH TRACKS. SATURATE PLANTING SOIL AFTERPLACEMENT AND ALLOW TO SETTLE FOR AT LEAST ONE WEEK PRIOR TO INSTALLING PLANT MATERIAL. 4.PLANT INSTALLATION - SEE LANDSCAPE PLANS. 5.MISCELLANEOUS - THE CONSTRUCTED WETLAND FACILITY MAY NOT BE CONSTRUCTED UNTIL ALLCONTRIBUTING DRAINAGE AREAS HAVE BEEN STABILIZED, AND SHALL REMAIN OFFLINE AND NOTOPERATIONAL UNTIL ALL VEGETATION IS STABILIZED. CONSTRUCTED WETLAND FACILITY OPERATION & MAINTENANCE: 1.THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE PROPER INSPECTION AND MAINTENANCE THE CONSTRUCTED WETLAND AND ALL ASSOCIATED APPURTENANCES UNTIL SUCH TIME THAT THEFACILITIES ARE ACCEPTED BY THE OWNER. 2.ALL SEDIMENT AND DEBRIS SHALL BE DISPOSED OF PROPERLY IN A PRE-APPROVED LOCATION ASAPPROVED BY THE TOWN. 3.THE CONTRACTOR SHOULD REFER TO THE STORMWATER POLLUTION PREVENTION PLAN (SWPPP) FOR ADDITIONAL INFORMATION PERTAINING TO STORMWATER FACILITY OPERATION AND MAINTENANCEREQUIREMENTS AND SHALL MAINTAIN A WORKING COPY ON SITE AT ALL TIMES. 4.THE CONSTRUCTED WETLAND FACILITIES SHALL BE INSPECTED BY THE CONTRACTOR AFTER EVERY MAJOR RAINFALL EVENT FOR THE ENTIRE DURATION OF THE CONSTRUCTION PROJECT AND THE FIRST 3-MONTHS AFTER CONSTRUCTION TO ENSURE PROPER STABILIZATION AND CONSTRUCTION. 5.SPECIFIC ANNUAL MAINTENANCE SHALL BE AS FOLLOWS: A.DRAINAGE STRUCTURES (INLETS, OUTLETS, SPILLWAYS, MANHOLES, CATCHBASINS, ETC): ALLDRAINAGE STRUCTURES WILL BE INSPECTED ANNUALLY TO MONITOR FOR PROPER OPERATION, COLLECTION OF LITTER OR TRASH, AND STRUCTURAL DETERIORATION. THE BASINS WILL BECLEANED OF SEDIMENT (INCLUDING SUMPS) AS NECESSARY, AND REPAIRED WHEN REQUIRED. B.STONE PROTECTION: STONE TREATMENT AT THE OUTFALLS OR INFLOW POINTS WILL BE INSPECTEDANNUALLY AND REPAIRED AS NECESSARY. C.ROUTINE MAINTENANCE: OTHER ROUTINE MAINTENANCE WILL INCLUDE REMOVAL OF TRASH AND LITTER FROM PAVED AND PERIMETER AREAS, AND ANNUAL STREET/PARKING LOT SWEEPINGAFTER THE SPRING THAW TO AVOID EXCESSIVE ACCUMULATION OF SEDIMENT IN THE DRAINAGESYSTEM. THE PIPES DRAINING THE PROJECT WILL BE INSPECTED ANNUALLY FOR PROPER FLOW. D.VEGETATION: VEGETATION WILL BE INSPECTED ANNUALLY TO ENSURE ADEQUATE PLANT GROWTHAND TO REMOVE INVASIVE SPECIES. DEAD OR DYING PLANTS WILL BE REPLACED AS NECESSARY. HARVESTING OF DEAD PLANT MATERIAL IS NOT REQUIRED, CONSTRUCTED WETLAND CONSTRUCTION SEQUENCE AND REQUIRED INSPECTIONS 1.PRECONSTRUCTION MEETING. 2.INSTALLATION OF EROSION AND SEDIMENT CONTROL PRACTICES. 3.CLEAR/GRUB PROPOSED DISTURBED AREA. 4.ROUGH GRADE CONSTRUCTED WETLAND AREAS DURING GENERAL SITE GRADING. 5.INSTALL INFLOW DRAINAGE SYSTEM AS SHOWN IN DETAILS (PIPE, CHANNEL, ETC). SEE NOTES ONSHEET C-2 AND DETAILS FOR INSTALLATION PROCEDURES. 6.GRADE AND STABILIZE ALL CONTRIBUTORY DRAINAGE AREAS TO THE CONSTRUCTED WETLANDFACILITY. 7.OVER EXCAVATE CONSTRUCTED WETLAND AREAS TO 4 INCHES BELOW PROPOSED GRADES. 8.INSTALL OVERFLOW OUTLET STRUCTURE PER DETAILS. 9.INSTALL SILT SOCK ALONG THE CONSTRUCTED WETLAND PERIMETER TO PREVENT SEDIMENT FROMWASHING INTO THE BASINS FROM DISTURBED AREAS AROUND THE FACILITY. 10.CONSTRUCT ALL BERMS AND SPILLWAYS AS SHOWN IN THE DETAILS. 11.INSTALL 4 INCHES OF ORGANIC PLANTING SOIL AS SHOWN IN THE DETAILS (UN-COMPACTED) - SEEPLANTING SOIL SPECIFICATIONS. THE CONTRACTOR MUST SUBMIT A SOIL SAMPLE (1 GALLON) TO THEENGINEER PRIOR TO SOIL DELIVERY TO THE SITE. 12.STABILIZE ALL REMAINING DISTURBED AREAS AROUND FACILITY BY SEEDING, HYDROSEEDING AND/OROTHER EROSION CONTROL METHODS AS OUTLINED IN THE EROSION AND SEDIMENT CONTROL PLANS AND DETAILS. MANDATORY INSPECTION REQUIRED SEE NOTE (3) BELOW. 13.INSTALL WETLAND PLANTS AS SHOWN IN PLANTING PLANS AND DETAILS. NO PLANTING SHOULD OCCUR BEFORE REMAINING DISTURBED AREAS AROUND THE FACILITY(IES) ARE STABILIZED. THECONTRACTOR WILL BE REQUIRED TO REMOVE ANY SEDIMENT WHICH WASHES INTO THECONSTRUCTED WETLAND AREA DURING THE CONSTRUCTION AND PLANTING PHASES. IF SUITABLEVEGETATIVE COVER HAS NOT BEEN ESTABLISHED ALONG THE CONSTRUCTED WETLAND SLOPES PRIOR TO PLANTING, A SILT FENCE PERIMETER SHALL BE INSTALLED AT THE TOE OF THE CONSTRUCTEDWETLAND SLOPESAND REMAIN IN PLACE UNTIL VEGETATIVE COVER IS ESTABLISHED. MANDATORYINSPECTION REQUIRED SEE NOTE (3) BELOW. 14.INSTALL REMAINING PLANTING SOIL AROUND PLANTS AS SHOWN IN DETAILS. 15.REMOVE REMAINING EROSION AND SEDIMENT CONTROLS ONLY AFTER SURROUNDING EXPOSED SOILARES HAVE BEEN PROPERLY STABILIZED. MANDATORY INSPECTION REQUIRED SEE NOTE (3) BELOW. NOTES:(1.) SEE GENERAL CONSTRUCTION NOTES FOR OVERALL CONSTRUCTION SEQUENCE.(2.) SEE GENERAL NOTES/SPECIFICATIONS/CONSTRUCTION DETAILS FOR DETAILED CONSTRUCTION REQUIREMENTS.(3.) MANDATORY NOTIFICATION/APPROVAL OF THE PROJECT ENGINEER IS REQUIRED PRIOR TOPROCEEDING WITH NEXT STAGE. CALL THE ENGINEER (HORSLEY WITTEN GROUP, INC.) AT 508-833-6600 PRIOR TO 12:00 NOON THE PROCEEDING DAY TO ARRANGE FOR INSPECTION. PERMITTING SET ONLY NOT FOR CONSTRUCTION D 3 4 6 665 4 3 6 5 4 9 18" HDPE L = 6' S = 1.78%131211101 0 9913 5 9 77 8 7 6 10 9 7 6 7 7 8 8 9EOP/BERM20 15 12 11 10 8 98910 11 17 15 16 14 9 10 11 9108 9 7 7 6 10 10 8 7 8910 11 11 7 15 141312 WF BVW 103 WF BVW 104 PAVED SWALE 100' BUFFE R T O BV W 50' UNDISTURBED BUFFER TO BVW 35' UNDISTURBE D BUFFE R T O BV W RIP RAPCURVE HILL ROAD(1) NS (1) NS (1) QR (1) PS (1) PS (3) IG (3) CA (3) CA (3) IG (3) IG (3) CA (3) MP (3) MP (3) RA (3) RA (3) MP (3) IG (3) CA (1) MP (1) IO (3) IG (1) VD (3) RA (6) CA (1) IO (1) VD (1) VD (1) IO (1) NS (1) NS (2) QR MAINTENANCE ACCESS PATH ZONE 2 (EDGE) - FACU/FAC(6) AI (21) CS (21) CV (3) ED (5) LC (14) OS ZONE 3 (0-6" DEPTH) - FAC/FACW (641) CS2 (150) HM2(171) IV(641) JE(534) SC ZONE 2 (EDGE) - FACU/FAC (78) AI (291) CS(291) CV(49) ED(68) LC (194) OS ZONE 1 (UPPER EDGE) - UPL (328) CP (131) CG(66) MB(66) PV(66) PD SEED MIX #1 SUBMERGED AQUATIC PLANTS (6"-18" DEPTH) - OBL (35) NO(35) PA2(35) VA2 ZONE 4 (6-18" DEPTH) - OBL (207) CC2(69) EF(138) SL(172) SP ZONE 2 (EDGE) - FACU/FAC (74) AI (277) CS (277) CV (46) ED (65) LC(185) OS ZONE 3 (0-6" DEPTH) - FAC/FACW (14) CS2 (3) HM2(4) IV(14) JE(12) SC ZONE 1 (UPPER EDGE) - UPL (166) CP (66) CG (33) MB (33) PV (33) PD (21) CO (20) CO ZONE 1 (UPPER EDGE) - UPL (218) CP(87) CG(44) MB(44) PV (44) PD (9) CO SEED MIX #1 MASS STATE PLANESYMBOL QTY BOTANICAL NAME COMMON NAME GROUND COVERS 3,940 sf SEED MIX #1: STABILIZER ROADSIDE & EROSION CONTROL MIX 3,940 sf Agrostis perennans Autumn Bentgrass 3,940 sf Andropogon gerardii Big Bluestem 3,940 sf Asclepias tuberosa Butterfly Milkweed 3,940 sf Carex swanii Swan's Sedge 3,940 sf Chamaecrista fasciculata Partridge Pea 3,940 sf Coreopsis lanceolata Lanceleaf Tickseed 3,940 sf Deschampsia flexuosa Crinkled Hair Grass 3,940 sf Desmodium canadense Showy Tick Trefoil 3,940 sf Elymus canadensis Canada Wild Rye 3,940 sf Festuca x Rough Bent Grass/Blue Hard Fescue 3,940 sf Schizachyrium scoparium Little Bluestem 3,940 sf Solidago sempervirens Seaside Goldenrod 3,940 sf Trifolium repens White Clover 1L - 6 7ofRevisions Appr.Rev.DateByDescription1234567PLANTING PLANSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 125022108 last modified: 09/18/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD LA.dwgSEPTEMBER 2024KJK/MBEKJKMBEChecked By:Designed By:Date:Drawn By:Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6A, Unit 1Sandwich, MA 02563508-833-6600 phone508-833-3150 faxHorsley Witten Group, Inc. (in feet) GRAPHIC SCALE 010 5 10 20 40 1 INCH = 10 FEET PERMITTING SET ONLY NOT FOR CONSTRUCTION SYMBOL CODE QTY BOTANICAL NAME COMMON NAME SIZE TREES NS 4 Nyssa sylvatica Tupelo 2" Cal. PS 2 Pinus strobus White Pine 2" Cal. QR 3 Quercus rubra Northern Red Oak 2" Cal. SYMBOL CODE QTY BOTANICAL NAME COMMON NAME SIZE SPACING SHRUBS CO 50 Cephalanthus occidentalis Buttonbush #1 36" o.c. CA 18 Clethra alnifolia Summersweet #5 48" o.c. IG 15 Ilex glabra Inkberry Holly #5 48" o.c. IO 3 Ilex opaca American Holly #7 60" o.c. MP 10 Myrica pensylvanica Northern Bayberry #5 48" o.c. RA 9 Rhus aromatica Fragrant Sumac #3 36" o.c. VD 3 Viburnum dentatum Viburnum #5 48" o.c. PLANT SCHEDULE SEED MIXES SYMBOL CODE QTY BOTANICAL NAME COMMON NAME SIZE SPACING GROUND COVERS 1,371 sf ZONE 1 (UPPER EDGE) - UPL CP 712 Carex pensylvanica Pennsylvania Sedge Plugs 50% @ 12" o.c. CG 284 Chelone glabra White Turtlehead Plugs 20% @ 12" o.c. MB 143 Monarda fistulosa Bergamot Plugs 10% @ 12" o.c. PV 143 Panicum virgatum Switch Grass Plugs 10% @ 12" o.c. PD 143 Penstemon digitalis Beardtongue Plugs 10% @ 12" o.c. 1,890 sf ZONE 2 (EDGE) - FACU/FAC AI 158 Asclepias incarnata Swamp Milkweed Plugs 8% @ 12" o.c. CS 589 Carex stipata Awl-fruited Sedge Plugs 30% @ 12" o.c. CV 589 Carex vulpinoidea Fox Sedge Plugs 30% @ 12" o.c. ED 99 Eutrochium dubium Joe Pye Weed Plugs 5% @ 12" o.c. LC 138 Lobelia cardinalis Cardinal Flower Plugs 7% @ 12" o.c. OS 393 Onoclea sensibilis Sensitive Fern Plugs 20% @ 12" o.c. 2,100 sf ZONE 3 (0-6" DEPTH) - FAC/FACW CS2 655 Carex stricta Tussock Sedge Plugs 30% @ 12" o.c. HM2 153 Hibiscus moscheutos Rose Mallow Plugs 7% @ 12" o.c. IV 175 Iris versicolor Blue Flag Plugs 8% @ 12" o.c. JE 655 Juncus effusus Soft Rush Plugs 30% @ 12" o.c. SC 546 Scirpus cyperinus Wool Grass Plugs 25% @ 12" o.c. 2,984 sf ZONE 4 (6-18" DEPTH) - OBL CC2 207 Carex comosa Longhair Sedge #1 15% @ 18" o.c. EF 69 Equisetum fluviale Horsetail Reed Grass #1 5% @ 18" o.c. SL 138 Sagittaria latifolia Broadleaf Arrowhead #1 10% @ 18" o.c. SP 172 Schoenoplectus pungens Common Threesquare #1 12.5% @ 18" o.c. 4,819 sf SUBMERGED AQUATIC PLANTS (6"-18" DEPTH) - OBL NO 56 Nymphaea odorata Fragrant Water Lily #1 4.5% @ 24" o.c. PA2 56 Persicaria amphibia Water Smartweed #1 4.5% @ 24" o.c. VA2 56 Vallisneria americana American Eelgrass #1 4.5% @ 24" o.c. PLANTING LAYOUT NOTES 1.FOR AREAS WITH MIXED PERENNIALS AND/OR GRASSES (SHOWN AS HATCHED AREAS ON PLANS), DO NOT PLANT IN A PATTERN OR WITH LARGE AREAS OF THE SAME SPECIES. RANDOMLY PLANT AS INDICATED ON THE PLANTING PLANS INTO SMALL GROUPINGS OF THE SAME SPECIES TO CREATE A MORE NATURALISTIC APPEARANCE. PLANT THE SAME PLANT SPECIES IN GROUPS OF 5-7 AND NOT LARGER THAN 7, DEPENDING ON THE OVERALL NUMBER OF PLANTINGS. NOTE: SUBMERGED AQUATIC PLANTS TO BE PLANTED ALONG THE EDGE OF ZONE 4 AND ALLOWED TONATURALIZE INTO DEEPER POOLS. PERENNIALS L - 7 7ofRevisions Appr.Rev.DateByDescription1234567PLANTING DETAILSSITE UBR #4: CURVE HILL ROADSTORMWATER RETROFIT DESIGN ANDIMPLEMENTATION PROJECT - 75% DESIGNYARMOUTH, MASSACHUSETTSSurvey Provided By:Sheet Number: Project Number: Registration:Prepared For:Plan Set:Plan Title:Sheet :Horsley Witten Group, Inc.90 Route 6ASandwich, MA 02536Phone: 508-833-6600Fax: 508-833-3150Dated: January 1, 2024Town of YarmouthDPW74 Town Brook RoadWest Yarmouth, MA 02673Phone: (508) 398-2231 ext. 125022108 last modified: 09/18/24 printed: 09/18/24 by kkH:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD LA.dwgSEPTEMBER 2024KJK/MBEKJKMBEChecked By:Designed By:Date:Drawn By:Sustainable Environmental Solutionswww.horsleywitten.com90 Route 6A, Unit 1Sandwich, MA 02563508-833-6600 phone508-833-3150 faxHorsley Witten Group, Inc. GENERAL PLANTING NOTES: 1.THE FOLLOWING NOTES ARE PROVIDED AS GENERAL PLANTING GUIDELINESONLY. THOROUGHLY REVIEW THE PROJECT SPECIFICATIONS FOR ALLLANDSCAPE REQUIREMENTS PRIOR TO THE COMMENCEMENT OF ANY LANDSCAPE WORK. SUBMIT IN WRITING TO THE LANDSCAPE ARCHITECT ANY QUESTIONS OR CLARIFICATIONS REQUIRED AT A MINIMUM OF 30 DAYS PRIOR TO ORDERING ANY MATERIALS OR BEGINNING ANY LANDSCAPE CONSTRUCTION. 2.SUBMIT TO THE LANDSCAPE ARCHITECT FOR REVIEW AND APPROVAL ALL REQUIRED LANDSCAPE SUBMITTALS AS DESCRIBED IN THE SPECIFICATIONSINCLUDING A PLANT LIST WITH PLANT SIZE AND QUANTITIES TO BE ORDEREDPRIOR TO DELIVERY TO THE PROJECT SITE. 3.FURNISH AND INSTALL ALL PLANTS AS SHOWN ON THE DRAWINGS AND IN THE SIZE AND QUANTITIES SPECIFIED ON THE PLANTING SCHEDULE. PLANT SUBSTITUTION SELECTION MUST BE APPROVED BY BIOLOGIST OR LANDSCAPE ARCHITECT PRIOR TO INSTALLATION. 4.ALL PLANTS TO COMPLY WITH APPLICABLE REQUIREMENTS OF ANSI Z60.1 "AMERICAN STANDARD FOR NURSERY STOCK." LATEST EDITION, PUBLISHED BYTHE AMERICAN NURSERY AND LANDSCAPE ASSOCIATION INC. 5.PLANTS TO BE GROWN UNDER CLIMATIC CONDITIONS SIMILAR TO THOSE IN THE LOCALITY OF THE PROJECT FOR AT LEAST TWO (2) YEARS. USE HEALTHY NURSERY GROWN PLANTS THAT HAVE A WELL DEVELOPED ROOT SYSTEM. PLANTS MUST BE FREE OF DISEASE, INSECTS, EGGS OR LARVAE. 6.INSTALL PLANTS WITHIN ONE (1) WEEK OF PURCHASE. IF PLANTS ARE TO BE STORED AT THE SITE PRIOR TO PLANTING, IT IS THE CONTRACTOR'SRESPONSIBILITY TO ENSURE THEY ARE PROPERLY MAINTAINED, WATERED, ANDREMAIN HEALTHY. 7.PROCEED WITH PLANTING ONLY WHEN EXISTING AND FORECASTED WEATHERCONDITIONS PERMIT. SUBMIT TO THE LANDSCAPE ARCHITECT IN WRITING THE PROPOSED PLANTING SCHEDULE. OBTAIN APPROVAL OF PLANTING SCHEDULE FROM THE LANDSCAPE ARCHITECT PRIOR TO PERFORMING ANY WORK. 8.SEASONS FOR PLANTING: SPRING:DECIDUOUS: APRIL 1 TO JUNE 15 EVERGREEN:APRIL 1 TO JUNE 15 PERENNIALS:APRIL 15 TO JUNE 1GROUNDCOVERS:APRIL 15 TO JUNE 1 FALL:DECIDUOUS:SEPTEMBER 15 TO NOVEMBER 15 EVERGREEN:SEPTEMBER 15 TO NOVEMBER 15 PERENNIALS:SEPTEMBER 15 TO NOVEMBER 15 GROUNDCOVERS:SEPTEMBER 15 TO NOVEMBER 15 9.PLANTING UNDER FROZEN CONDITIONS WILL NOT BE PERMITTED. PLANTING BEFORE OR AFTER THE ABOVE REFERENCED PLANTING DATES WILL INCREASE THE LIKELIHOOD OF PLANT ESTABLISHMENT FAILURE. ANY DEVIATION FROM THEABOVE REFERENCED PLANTING DATES IS UNDERTAKEN AT SOLE RISK OF THECONTRACTOR AND IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO PROVIDE ANY ADDITIONAL MAINTENANCE AND WATERING WHICH MAY BE REQUIRED TO ENSURE SATISFACTORY PLANT ESTABLISHMENT. 10.FURNISH ONE YEAR MANUFACTURER WARRANTY FOR TREES, PLANTS, AND GROUND COVER AGAINST DEFECTS INCLUDING DEATH AND UNSATISFACTORY GROWTH. EXCEPTIONS ARE DEFECTS RESULTING FROM LACK OF ADEQUATEMAINTENANCE, NEGLECT OR ABUSE BY OWNER, OR ABNORMAL WEATHERCONDITIONS UNUSUAL FOR WARRANTY PERIOD. THE DATE OF FINALACCEPTANCE OF ALL COMPLETED PLANTING WORK ESTABLISHES THE END OF INSTALLATION AND INITIAL MAINTENANCE PERIOD AND THE COMMENCEMENT OF THE GUARANTEE PERIOD. 11.ALL TREES WITHIN 5'-0" OF WALKWAYS AND SIDEWALKS TO HAVE A 6'-8" STANDARD BRANCHING HEIGHT. 12.INSPECT ALL AREAS TO BE PLANTED OR SEEDED PRIOR TO STARTING ANYLANDSCAPE WORK. REPORT ANY DEFECTS SUCH AS INCORRECT GRADING,INCORRECT SUBGRADE ELEVATIONS OR DRAINAGE PROBLEMS, ETC. TO THELANDSCAPE ARCHITECT AND ENGINEER PRIOR TO BEGINNING WORK. COMMENCEMENT OF WORK INDICATES ACCEPTANCE OF SUBGRADE AREAS TO BE PLANTED, AND THE LANDSCAPE CONTRACTOR ASSUMES RESPONSIBILITY FOR ALL LANDSCAPE WORK. 13.PROVIDE PROPER PREPARATION OF ALL PROPOSED PLANTED AND SEEDED AREAS PER THE NOTES AND SPECIFICATIONS. 14.ALL PLANT LAYOUT AND ACTUAL PLANTING LOCATIONS ARE TO BE FIELD VERIFIEDBY LANDSCAPE ARCHITECT PRIOR TO PLANTING. NOTIFY THE LANDSCAPE ARCHITECT AT A MINIMUM OF 48 HOURS IN ADVANCE PRIOR TO SCHEDULING ANY FIELD INSPECTIONS. 15.BALL AND BURLAP: REMOVE BURLAP AND WIRE BASKETS FROM TOPS OF BALLS AND FROM TOP HALF OF ROOTBALL AS INDICATED ON DRAWINGS. REMOVE PALLETS, IF ANY, BEFORE SETTING. 16.POTTED PLANTS: REMOVE THE PLANT FROM THE POT AND LOOSEN OR SCORETHE ROOTS BEFORE PLANTING TO PROMOTE OUTWARDS ROOT GROWTH INTOTHE SOIL. 17.PLUGS: PLANT UPRIGHT AND NOT AT AN ANGLE. DIG PLANTING HOLES LARGE ENOUGH AND DEEP ENOUGH TO ACCOMMODATE THE ENTIRE ROOT MASS. PLANT PLUGS WITH NO TWISTED OR BALLED ROOTS AND WITH NO ROOTS EXPOSED ABOVE THE GRADE LINE. HAND PACK THE SOIL AROUND THE ENTIRE PLUG ROOT MASS. 18.DIG THE THE PLANTING HOLE TO THE SAME DEPTH AS THE ROOT BALL AND TWOTO THREE TIMES WIDER. SCORE ALL SIDES OF THE HOLE, PLACE THE PLANT INTHE HOLE SO THE TOP OF ROOT BALL IS EVEN WITH SOIL SURFACE. FILL THEHOLE HALFWAY AND THEN ADD WATER ALLOWING IT TO SEEP INTO BACK FILLED MATERIAL. BE SURE TO REMOVE ALL AIR POCKETS FROM BACK FILLED SOIL. DO NOT SPREAD SOIL ON TOP OF THE ROOTBALL. IF SOIL IS EXTREMELY POOR, REPLACE BACK FILL WITH GOOD QUALITY TOP SOIL. AMEND THE SOIL, AS NECESSARY. 19.CREATE A 2" TO 4" BERM AROUND THE EDGE OF PLANTING HOLE WITH REMAININGSOIL TO RETAIN WATER. 20.REMOVE ALL PLANT TAGS AND FLAGS FROM THE PLANTS. 21.MULCH ALL PLANTING BEDS AS INDICATED ON DRAWINGS. UNLESS NOTED OTHERWISE, ALL PLANTS TO RECEIVE 2-3 INCHES OF MULCH. DO NOT PILE OR MOUND MULCH AROUND THE PLANT STEMS OR TRUNK. 22.TRIM BROKEN AND DEAD BRANCHES FROM TREES AND SHRUBS AFTER PLANTING. NEVER CUT A LEADER. 22.MINIMIZE THE USE OF FERTILIZERS AS REQUIRED FOR PLANT ESTABLISHMENT,SEE SPECIFICATIONS. DO NOT USE NITROGEN CONTAINING FERTILIZERS,PESTICIDES OR CHEMICALS DURING PLANTING AND MAINTENANCE OF THE LANDSCAPING OR LAWN AREAS. ADDITIONALLY, DO NOT USE PESTICIDES OR HERBICIDES CONTAINING INORGANIC COMPOUNDS (IOC) AS LISTED IN THE MASSACHUSETTS DRINKING WATER REGULATION (310 CMR 22.06), OR SYNTHETIC ORGANIC COMPOUNDS (SOC) OR VOLATILE ORGANIC COMPOUNDS (VOC) AS LISTED IN THE MASSACHUSETTS DRINKING WATER REGULATION (310 CMR 22.07). GENERAL SEEDING NOTES: 1.SEND A REPRESENTATIVE SAMPLE OF THE TOPSOIL TO A TESTING LABORATORY FORSTANDARD SOIL ANALYSIS AS DESCRIBED IN THE SPECIFICATIONS. SUBMIT TO THELANDSCAPE ARCHITECT AND ENGINEER TEST RESULTS WITH RECOMMENDED SOIL TREATMENTS TO PROMOTE PLANT AND GRASS GROWTH. CORRECT DEFICIENCIES IN THE LOAM AND STOCKPILED TOPSOIL AS DIRECTED BY THE TESTING AGENCY. 2.ALL AREAS THAT ARE DISTURBED AND/OR GRADED DURING CONSTRUCTION ARE TO BE BROUGHT TO FINISHED GRADE WITH AT LEAST 4" MINIMUM DEPTH OF GOOD QUALITY LOAM AND SEEDED WITH A QUICK GERMINATING GRASS SEED SUCH AS NEWENGLAND EROSION CONTROL RESTORATION MIX OR AS SPECIFIED ON THE PLANS. 3.PRIOR TO THE PLACEMENT OF TOP SOIL, LOOSEN THE SUBGRADE OF ALL PROPOSEDSEEDED AREAS TO A DEPTH OF 6" AND RAKE TO REMOVE STONES LARGER THAN 1 INCH, STICKS, ROOTS, RUBBISH AND OTHER EXTRANEOUS MATTER AND LEGALLY DISPOSE TO AN OFF SITE LOCATION. 4.DO NOT SPREAD TOPSOIL IF THE SUBGRADE IS FROZEN, EXCESSIVELY WET, COMPACTED OR NOT PROPERLY PREPARED PER THE NOTES AND SPECIFICATIONS. 5.SEE SPECIFICATIONS FOR SEASONAL REQUIREMENTS FOR SEEDING. WATERING NOTES: 1.PROVIDE PROPER PLANT CARE, MAINTENANCE AND WATERING ON SITE UNTIL SUCH TIME AS THE LANDSCAPING IS ACCEPTED BY THE PROPERTY OWNER AS SATISFACTORY PER THE SPECIFICATIONS OR AS DETERMINED BY ANY WRITTEN AGREEMENTS BETWEEN THE CONTRACTOR AND PROPERTY OWNER. 2.ESTABLISH AN APPROPRIATE WATERING SCHEDULE FOR ALL PLANT MATERIALBASED UPON PLANT SPECIES REQUIREMENTS AND SITE CONDITIONS. PROVIDESCHEDULE IN WRITING TO THE LANDSCAPE ARCHITECT AND OWNER FOR REVIEW AND APPROVAL. ADHERE TO THE APPROVED SCHEDULE UNTIL PLANTS ARE FULLY ESTABLISHED. 3.AT A MINIMUM THE NEWLY SEEDED AREA SHOULD BE WATERED DAILY UNTIL ESTABLISHMENT AND THEN 2-3 TIMES A WEEK. IF AN IRRIGATION SYSTEM IS NOT PROVIDED, A TEMPORARY IRRIGATION SYSTEM OR HANDHELD GARDEN HOSESHALL BE USED FOR WATERING SEEDED AREAS. THE AREA MUST BE MAINTAINEDCONSISTENTLY MOIST FOR THE BEST GERMINATION RESULTS. ADDITIONALWATERING MAY BE REQUIRED IF PLANTING AND SEEDING OCCUR OUTSIDE OF THE RECOMMENDED PLANTING SEASONS. PLANTING SECTION (INUNDATION LEVEL) NOT TO SCALE PERMANENT POOL EL: 7.85' PROPOSED SLOPE, SEE GRADING PLAN NOTES: 1.ALL PLANTS TO BE FIELD LOCATED BASED ON INUNDATION LEVEL AFTER EDGE OFCONSTRUCTED WETLAND HAS BEEN GRADED. MAXIMUMINUNDATION FOR PLANTING1.0' ZONE 2: EDGE SEE PLANT LISTFOR SPECIES &WETLAND SEEDMIX ZONE 3: 0-6" INUNDATIONSEE PLANT LISTFOR SPECIES ZONE 4: 6" -18"INUNDATIONSEE PLANT LISTFOR SPECIES ZONE 1:EDGE-UPPER SEE PLANTLIST FORSPECIES & SEED MIX DEEP POOL 18"+NO PLANTINGOR SEEDING 100-YR STORM EL. 8.79' RETAIN SAME FINISH GRADE AFTER PLANTING AS ORIGINAL GRADE BEFOREDIGGING GENTLY HAND-LOOSEN SOIL FROMAROUND ROOTBALL WITHOUT SEVERING MAIN ROOTS. SPREADROOTS OVER MOUND OF UNDISTURBEDSUBGRADE 3" PINEBARK MULCH. PULL MULCH 3"-6"AWAY FROM BASE OF PERENNIAL.REMOVE SAUCER AFTER ONE SEASON. MINIMUM 2 x DIAMETEROF ROOT BALL PERENNIAL CONTAINER PLANTING NOT TO SCALE MOUND WITH EXCAVATED SOIL TO 3"ABOVE FINISHED GRADE. EXCAVATE HOLE TO DIAMETER 2XWIDER THAN ROOTBALL. BACKFILLWITH LOAM. APPROVED SUBGRADE 12"-18" O.C. 12"-18" O.C. PACK BACKFILL BY HAND PLANT 12"-18" ON CENTER ASNOTED IN PLANT LIST PERENNIAL PLUG PLANTING NOT TO SCALE PLANT CELL PRUNE BROKEN OR DEADBRANCHES AS DIRECTED BYLANDSCAPE ARCHITECT PLANT SHRUB PLUMB TOP OF ROOTBALLTO MATCH FINISHGRADE WITHIN 1" 3" SHREDDED MULCH AS INDICATED PREPAREDPLANTING SOIL MIXTURE UNDISTURBEDPERVIOUS SOIL REMOVE TOP THIRD OFBURLAP AT ROOTBALL MINIMUM 2 x DIAMETER OF ROOTBALL SHRUB PLANTING NOT TO SCALE 6" MIN. SCARIFY BOTTOM OFPLANTING HOLE 4" DEEP 2"-4" SOIL BERM APPROVED SUBGRADE UNDISTURBEDPERVIOUS SOIL PREPARED PLANTINGSOIL MIXTURE FIRMLY FORMED SAUCER (USE TOP SOIL) ANGLE OF REPOSE VARIES WITHSTEEPNESS OF SLOPE ANDSOIL TYPE 2"-4" SOIL BERM 3" SHREDDEDMULCH AS INDICATED TOP OF ROOTBALL TO MATCHFINISH GRADE WITHIN 1" SHRUB PLANTING ON SLOPE NOT TO SCALE MINIMUM 2 x DIAMETER OF ROOTBALL 6" MIN. NOTES:1.PLANTING BACKFILL: 1/3 LOAM, 1/3 SAND, 1/3 PEAT, BY VOLUME.2.WHEN PLANTING ON SLOPE-MODIFY SLOPE AS SHOWN. REMOVE TOP THIRD OF BURLAP AT ROOTBALL SCARIFY BOTTOM OFPLANTING HOLE 4" DEEP PRUNE BROKEN OR DEADBRANCHES AS DIRECTED BYLANDSCAPE ARCHITECT PLANT SHRUB PLUMB APPROVED SUBGRADE EQ. EQ. EQ. PLANTING SPACING NOT TO SCALE MINIMUM 2 x DIAMETER OF ROOTBALL 4'-0" MIN. DECIDUOUS TREE PLANTING NOT TO SCALE 1'-0"MIN. PLANT TREE PLUMB - PRUNE BROKEN OR DEADBRANCHES AS DIRECTED BYLANDSCAPE ARCHITECT NYLON GUY WEBBING-STAPLE OR TIE TO STAKE 3-2"x3"xVARIES WOOD STAKES TO FIRST WHORLOF BRANCHES @ 120 DEGREEINTERVALS AND PLACED PLUMB. DO NOT PUT STAKES THROUGH ROOTBALL 3" SHREDDED MULCHIN TREE PIT OR AS INDICATED REMOVE TOP THIRD OF BURLAP AT ROOTBALL SCARIFY SIDE WALLS ANDBOTTOM OF TREEPIT 4" DEEP 2"-4" SOIL BERM PLANTING SOIL APPROVED SUBGRADE TOP OF ROOTBALL FLUSH WITH FINISH GRADE. ROOT FLAREEXPOSED. DO NOT BURY ORPILE MULCH. GRADE 3'-0" MIN. 2'-0" MIN. PLANT TREE PLUMB - PRUNE BROKEN OR DEADBRANCHES AS DIRECTED BYLANDSCAPE ARCHITECT NYLON GUY WEBBING-STAPLE OR TIE TO STAKE REMOVE TOP THIRD OF BURLAP AT ROOTBALL PREPARED PLANTINGSOIL MIXTURE MINIMUM 2 x DIAMETER OF ROOT BALL 4'-0"MIN. 3'-0"MIN.1'-0"MIN TREE PLANTING ON SLOPE NOT TO SCALE PERVIOUS SOIL FIRMLY FORMED SAUCER (USE TOPSOIL) ANGLE OF REPOSEVARIES WITH STEEPNESS OFSLOPE AND SOIL TYPE 3" SHREDDED MULCHIN TREE PIT OR AS INDICATED 3-2"x3"xVARIESWOOD STAKES TO FIRST WHORL OF BRANCHES @ 120 DEGREEINTERVALS AND PLACED PLUMB APPROVED SUBGRADE MINIMUM 2x DIAMETER OF ROOT BALL 3'-0"MIN. 4'-0" MIN. EVERGREEN TREE PLANTING NOT TO SCALE PLANT TREE PLUMB -PRUNE BROKEN OR DEADBRANCHES AS DIRECTED BY LANDSCAPE ARCHITECT NYLON GUY WEBBING-STAPLE OR TIE TO STAKE 3-2"x3"xVARIES WOOD STAKES TO FIRST WHORL OF BRANCHES@ 120 DEGREE INTERVALS ANDPLACED PLUMB. REMOVE TOP THIRD OFBURLAP AT ROOTBALL PLANTING SOIL APPROVED SUBGRADE 3" SHREDDED MULCHIN TREE PIT OR AS INDICATED ROOT FLARE AT GRADE DO NOT BURY OF PILE MULCH GRADE SCARIFY SIDE WALLS ANDBOTTOM OF TREEPIT 4" DEEP1'-0" MIN. 4" LOAM AND SEED NOT TO SCALE TOPSOIL- NO STONES GREATER THAN 1" Ø,COMPACT WITH A HANDROLLER IN TWODIRECTIONS AND FINE RAKE PRIOR TO SEEDING. SUBSOIL- COMPACTION NO > 90% DENSITY FINISH GRADE SEED AS SPECIFIED IN NOTESAND DRAWINGS. SUBSOIL- SCARIFY AND LOOSENROUGH GRADE PRIOR TO TOPSOILPLACEMENT NOTES:1.SEE LANDSCAPE GRADING SPECIFICATIONS FOR TOPSOIL REQUIREMENTS.2.CONFIRM SUBGRADES ARE CORRECT AND POSITIVE DRAINAGE IS MAINTAINED PRIOR TO PLACEMENT OF TOPSOIL.3.NOTIFY ENGINEER/LANDSCAPE ARCHITECT FOR REVIEW OF SUBGRADE PRIOR TO PLACEMENT OFTHE TOPSOIL. PERMITTING SET ONLY NOT FOR CONSTRUCTION 2 LOOSEN ROOTS REMOVE CONTAINER CONTAINER PLANT ROOTBALL TREATMENT NOT TO SCALE SCORE ROOTBALL IF POT-BOUND RETAIN SAME FINISH GRADE AFTER PLANTING AS ORIGINAL GRADE BEFORE DIGGING GENTLY HAND-LOOSEN SOIL FROM AROUNDROOTBALL WITHOUT SEVERING MAIN ROOTS. SPREAD ROOTS OVER MOUND OF UNDISTURBED SUBGRADE MULCH, SEE NOTES AND SPECIFICATIONS MOUND WITH EXCAVATED SOIL TO 2" ABOVEFINISHED GRADE. PLANTING SOIL, SEE PLAN, DETAIL AND SPECIFICATIONS. SCARIFY BOTTOM OF PLANTING HOLE 6" DEEP APPROVED SUBGRADEMIN. 2 x ROOT BALL,SEE PLANS CONTAINERIZED MATERIAL PLANTING NOT TO SCALE 12"-18" O.C. 12"-18" O.C. PACK BACKFILL BY HAND PLANT 12"-18" ON CENTER ASNOTED IN PLANT LIST SUBMERGED PERENNIAL PLUG PLANTING NOT TO SCALE PLANT CELL 6" LANDSCAPESTAKE SET AT 45° Attachment D – Stormwater Report prepared by Horsley Witten Group, Inc. [electronic copy submitted to Yarmouth Conservation Commission agent for distribution] STORMWATER MANAGEMENT REPORT Curve Hill Road - Yarmouth, MA September 2024 Yarmouth Stormwater Design and Implementation Project Partner: Association to Preserve Cape Cod Owner/Operator: Town of Yarmouth Curve Hill_SW Checklist • 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 in 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. Curve Hill_SW Checklist • 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 9/18/2024 Curve Hill_SW Checklist • 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): 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. Curve Hill_SW Checklist • 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 Volume 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. Curve Hill_SW Checklist • 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 stormwater 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 requirement and, if applicable, the 44% TSS removal pretreatment requirement, are provided. Curve Hill_SW Checklist • 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 Handbook 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. Curve Hill_SW Checklist • 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 the 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. Curve Hill_SW Checklist • 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 Report 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. i STORMWATER MANAGEMENT REPORT CURVE HILL ROAD YARMOUTH STORMWATER DESIGN AND IMPLEMENTATION PROJECT YARMOUTH, MA Table of Contents STORMWATER CHECKLIST ........................................................................................................... ii EXECUTIVE SUMMARY ................................................................................................................. 1 1.0 INTRODUCTION ................................................................................................................ 2 1.1 Background .................................................................................................................... 2 1.2 Project Goals .................................................................................................................. 2 1.3 Design Methodology ....................................................................................................... 3 2.0 Existing Conditions .......................................................................................................... 3 2.1 Receiving Water and Watershed .................................................................................... 4 2.2 Drainage Area ................................................................................................................ 4 2.3 Resource Areas .............................................................................................................. 5 2.4 Soils ................................................................................................................................ 5 3.0 Proposed Conditions ...................................................................................................... 6 3.1 Drainage Areas ............................................................................................................... 6 3.2 Structural Stormwater Control Measures (SCMs) .......................................................... 6 4.0 Stormwater Design Components .................................................................................. 7 4.1 Water Quality .................................................................................................................. 7 4.2 Recharge ........................................................................................................................ 8 4.3 Water Quantity ................................................................................................................ 9 4.4 Erosion Control ............................................................................................................... 9 4.5 Operation and Maintenance ......................................................................................... 10 4.6 Illicit Discharges ............................................................................................................ 10 5.0 REFERENCES ................................................................................................................... 11 ii TABLES Table 1. Project MASMS Compliance Summary .......................................................................... 1 Table 2. Test Pit (TP) Results ....................................................................................................... 5 Table 3. Compliance with Water Quality Volume (WQV) Requirements ...................................... 7 Table 4. Compliance with Water Quality Pollutant Load Reduction Requirements ...................... 8 Table 5. Summary of Existing and Proposed Condition Peak Flow Rates and Runoff Volumes .. 9 FIGURES Under Notice of Intent (NOI) Cover Figure 1: USGS Topographic Map Figure 2: Aerial Figure 3: FEMA Figure 4: Environmental Constraints Figure 5: Soils Figure 6: Environmental Justice Communities Figure 7: Impaired Waters APPENDICES Appendix A: Drainage Areas Appendix B: Hydrologic/Hydraulic Model Results Appendix C: Soil Test Pit Logs Appendix D: Operation and Maintenance Guide Appendix E: Pollutant Controls During Construction Appendix F: Site Plans Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 1 EXECUTIVE SUMMARY The purpose of this report is to describe existing and proposed drainage conditions of the Curve Hill Road site (UBR-4) in Yarmouth, as well as proposed green stormwater infrastructure (GSI) structures and management strategies to reduce stormwater impacts. This project is part of efforts to improve water quality in the Town of Yarmouth by reducing pollutant loads in stormwater runoff, specifically phosphorus, nitrogen, bacteria, and sediment. The Curve Hill Road site was identified as a priority stormwater retrofit in a CZM-funded assessment focused on green infrastructure stormwater control measures (SCMs) and low impact design. The main goal for this site is to capture, manage and treat stormwater runoff from Great Western Road and Curve Hill Road prior to discharging to a freshwater wetland. This project involves the development of new GSI at a non-developed Town-owned property to treat the first flush of pollutants (the water quality volume (WQV), or first 1 inch of runoff) of the area draining to the site. The project includes the following structural SCMs: • Constructed wetland to provide treatment, and • Proprietary water quality unit for pretreatment. Since the proposed stormwater management system is a retrofit project undertaken solely to improve water quality at the site, it falls under the redevelopment category in accordance with the Massachusetts Stormwater Management Standards (MASMS 2008), as described in Massachusetts Stormwater Handbook, Volume 1 Chapter 1. As a redevelopment project, the design is required to meet the MASMS standards to the maximum extent practicable (MEP). As shown in Table 1, the proposed project meets or exceeds each standard, except the recharge standard that is not applicable. The proposed constructed wetland is designed to capture and treat the full one inch of runoff of the contributing drainage area. Overall, this project will reduce on-going impacts to the natural wetland and Bass River. Table 1. Project MASMS Compliance Summary Minimum Standard Type Compliance Report Reference(s) 1 New Stormwater Conveyances Narrative Yes Section 3.2 2 Water Quantity Calculation Yes Section 4.3/Table 5 /Appendix B 3 Recharge Calculation N/A Section 4.2 /Appendix B 4 Water Quality Calculation Yes Section 4.1/Table 3/Table 4/Appendix B 5 Land Uses with Higher Potential Pollutant Loading Narrative N/A Section 2.0 6 Critical Areas Narrative Yes Section 4.1 7 Redevelopment Narrative Yes Section 4.0 8 Erosion Control Narrative Yes Section 4.4/Appendix F 9 Operation and Maintenance Narrative Yes Section 4.5/Appendix D 10 Illicit Discharges Narrative Yes Section 4.6 Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 2 1.0 INTRODUCTION This report provides a summary of the stormwater management systems proposed for Curve Hill Road in Yarmouth, MA. The Yarmouth Department of Public Works (DPW) is proposing this project in collaboration with the Association to Preserve Cape Cod (APCC) as a part of a town effort (Yarmouth Stormwater Design and Implementation Project) to improve water quality in the Town of Yarmouth. The proposed project has been designed to retrofit existing impervious areas for water quality improvements and improving overall site conditions. This report describes the existing and proposed site conditions and the practices to be implemented to reduce stormwater discharges and pollutants during and after construction. As required for retrofit projects, the stormwater system for the project has been designed to conform to the requirements of the Massachusetts Stormwater Management Standards (MASMS) to the maximum extent practicable. 1.1 Background Freshwater wetland resources and coastal embayments across Cape Cod are significantly degraded by nutrient and bacteria impairment. Land uses, including stormwater runoff and fertilizer use, contribute on average 20% of the controllable nitrogen load within our coastal watersheds (Cape Cod Commission 208 Plan, 2015) and bacterial contamination, including cyanobacteria, regularly causes closures of beaches. It’s been reported (APCC’s 2022 State of the Waters) that 90% of the coastal embayments and 39% of the freshwater ponds assessed received unacceptable water quality scores. These high nutrient loads are of concern for the environment, our coastal economy, and public health as they negatively impact habitat for fish and shellfish and can result in unsafe conditions for swimming, fishing and boating. As part of a Coastal Zone Management (CZM) Coastal Habitat and Water Quality Grant, the Yarmouth DPW, APCC and Horsley Witten Group (HW) completed a comprehensive assessment and stormwater management plan identifying and prioritizing stormwater retrofit sites on the south shore of Yarmouth. Concept designs were ranked based on various criteria including potential pollutant removal (i.e., load and drainage area), water quality status of the associated waterbody, construction cost and feasibility, and additional human use and resource benefits (restored shellfish and anadromous fish habitat, proximity to environmental justice communities, improved climate resiliency, opportunity for public education, etc.). With additional support from a second Coastal Habitat and Water Quality Grant, 25% designs were developed for five high-ranking priority sites, and two sites were chosen to advance to 75% designs and permitting, including this one on Curve Hill Road. Funding is available to further advance the two priority sites through 100% design and construction. 1.2 Project Goals The purpose of this project is to improve water quality in Bass River by reducing or eliminating pollutant loads from stormwater runoff from Great Western Road and Curve Hill Road using GSI SCMs. Specifically, the project aims to maximize pollutant removal (% bacteria, nitrogen and phosphorus) and water quality volume treated. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 3 1.3 Design Methodology The design was completed by the following tasks: • Preliminary field assessment of the site and contributing drainage area to identify usage, physical and environmental constraints and opportunities, and long-term operation and maintenance concerns; • Determination of drainage areas and land coverage within the project area; • Selection of structural SCMs best suited to site conditions and project goals; • Structural SCM sizing and performance estimates (described further below); • Hydrologic/Hydraulic Modeling (described further below); • Grading and layout of site plan; • Erosion control plan development; and • Operation and maintenance (O&M) plan development. SCM Performance Estimates The proposed SCMs were selected and sized to maximize pollutant load removals. Since the waterbodies this site drain to are shellfish growing areas, have water quality impairments and are subject to TMDLs, the SCMs were chosen to maximize not only total suspended solids (TSS) removal, but total phosphorus (TP), total nitrogen (TN), and bacteria load reductions as well. MASMS was used as a reference for TSS removal estimates for constructed wetlands, but the more recently developed pollutant load removal curves (USEPA 2021 & Paradigm Environmental 2019) were used for TP, TN, and bacteria.1 Hydrologic/Hydraulic Modeling Existing and proposed conditions for the project area were modeled using HydroCAD software, which combines USDA Natural Resources Conservation Service hydrology and hydraulic techniques (commonly known as SCS TR-55 and TR-20) to generate hydrographs. Conditions were evaluated for the water quality event (storm that produces 1 inch of runoff, or a roughly 1.2-inch rain event) as well as larger storm events, including the 2-, 10-, 25- and 100-year 24-hour Type III storm events. The rainfall depths used for each storm event are the NOAA+ values (NOAA Atlas 14 90% Upper Confidence value multiplied by 0.9) (NOAA NWS, 2017). Rainfall values are included in Appendix A. 2.0 Existing Conditions The Curve Hill Road site (UBR-4) is located along the southern side of Curve Hill Road on Town-owned property between Curve Hill Road and Four Seasons Drive, on the western side of Yarmouth, approximately half a mile west of Bass River. The site is an undeveloped, mostly wooded, and depressed area upgradient of an existing wetland. The site is surrounded by residential properties, except for sections to the north and southwest where it directly borders the Curve Hill Road Right-of-Way. The Blue Rock Golf Course is located to the west of the site, just beyond the residential lots on the west side 1 It is important to note that these curves have a crosswalk to help users determine which specific curve to reference: for constructed wetlands, the appropriate curve is the Wet Pond Performance Curve. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 4 of Curve Hill Road. The site’s land use is not classified as a land use with higher potential pollutant loads (LUHPPL) and thus, is not subject to MASMS Standard 5. Part of the site is in a wellhead protection area (Zone II) (NOI Narrative Figure 4), thus, subject to MASMS Standard 6. Drainage infrastructure (e.g., catch basins, manholes, and pipes) located along Great Western Road discharges via an outlet pipe to the site. Large sediment accumulation was observed at the site; so much so that the outfall was difficult to field locate as it was buried in sediment. This sediment accumulation is likely due to the large drainage area to the Great Western Road infrastructure and the lack of existing SCMs. In addition, runoff from Curve Hill Road flows into the site via a paved flume close to the outfall from Great Western Road. 2.1 Receiving Water and Watershed Great Western Road and Curve Hill Road runoff flows through the project site and discharges into a wetland, which ultimately connects to the Bass River that flows into Nantucket Sound. Bass River provides habitat for shellfish growing areas. However, it is listed as impaired for total nitrogen and fecal coliform by the most recent Massachusetts DEP 303(d) – 2022 Integrated list of Waters. Bass River is located in the Bass River Watershed, for which TMDL documents have been developed for nitrogen, fecal coliform, nutrient/eutrophication biological indicators, and estuarine bioassessments. The full list of impairments for this portion of the watershed is listed below, and a map showing these resources is included in NOI Narrative Figure 7: • Bass River (MA96-118) “Grand Cove” portion, Yarmouth, Bass River Watershed – Impaired for total nitrogen and nutrient/eutrophication biological indicators; Category 4a (TMDL completed) of the 2022 Integrated List of Waters. • Bass River (MA96-12) Headwaters outlet, Yarmouth, Bass River Watershed – Impaired for total nitrogen, fecal coliform, and estuarine bioassessments; Category 4a (TMDL completed) of the 2022 Integrated List of Waters. 2.2 Drainage Area The Curve Hill Road project site existing contributing drainage area is approximately 13.0 acres, 4.15 acres (32%) of which is impervious. This area consists of undisturbed forest, residential properties, small lawn areas, and roads. Based on existing topography and flow paths, the total drainage area was divided into three separate drainage areas: DA1 (area draining overland on both sides of the site), DA2A (area draining to the existing paved flume on Curve Hill Road), and DA2B (area draining to the Great Western Road discharge pipe). DA2B is the largest drainage area (approximately 9.0 acres), as it includes all of the area draining to the existing drainage infrastructure along Great Western Road. All drainage areas eventually drain to the wetland, modeled as Study Point 1 (SP1). See the existing drainage area map and detailed breakdown of land cover in Appendix A, as well as the existing HydroCad model report in Appendix B. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 5 2.3 Resource Areas HW wetland biologists delineated several resource areas at the site in November 2023. A full description of these resource areas is included in NOI Narrative, and their locations and associated buffers are shown on the plans in Appendix F. The only wetland resource areas identified at the site are the Bordering Vegetated Wetland and the Other Areas of Flood Hazard FEMA Zone X. Invasive plant species were not observed to be significantly present at the site. This site is considered a critical area (Zone II) and it is subject to MASMS Standard 6. 2.4 Soils Soils data from the Natural Resources Conservation Service (NRCS) indicate that the soils within the drainage area are composed of Carver coarse sand, at 3-8% slopes, and Freetown and Swansea mucks, 0-1% slopes. Carver coarse sand is hydrologic soil group A (HSG) and hydrologic soil group B (HSG) and Freetown and Swansea mucks are hydrologic soil group B/D (HSG), as shown in NOI Narrative Figure 5 of the NOI application. One test pit (TP) was conducted at the site on January 4, 2024 in the Town right-of-way on the southern side of Curve Hill Road near 7 Curve Hill Road. The test pit was witnessed and logged by a HW Massachusetts Title 5 Approved Soil Evaluator, with the results shown in Table 2 below. See Appendix C for soil test pit logs. The test pit aimed to evaluate subsurface conditions and estimate seasonal high groundwater (ESHGW) based on evidence of mottling or redox. Since no mottling or redox was observed, the Frimpter Method (USGS, 2022; Cape Cod Commission, 2006; Cape Cod Commission, 2024)2 was used to determine what adjustments could be made to estimate ESHGW. The Frimpter Method suggested a 2-foot adjustment would be appropriate for this site. However, the bordering vegetated wetland (BVW) downgradient of the project site was delineated between elevation 6.8 and 8.0 feet closest to the outlet of the proposed GSI, a constructed wetland. Typically, groundwater is assumed within 12 inches of the surface for BVW. Furthermore, site topographical observations indicate that there are areas on the site at elevation 7 that were not delineated as a wetland. Given the test pit and site walk observations, Frimpter Method adjustments, and wetland delineation data sheets, ESHGW was assumed at 7.5 feet for this site. Table 2. Test Pit (TP) Results Test Pit ID Surface Elevation at TP (ft) Pit Bottom Elevation (ft) Observed GW (ft) ESHGW Elevation (ft)* Soil Texture(s) at SCM TP-1 11.2 5.0 6.0 7.5 Coarse sand *ESHGW determined from a combination of test pit data, site observations, wetland delineation data sheets, and Frimpter Method adjustments. 2 Index Well Mashpee 29 (MIW-29) Zone B adjustment factor in January 2024 of 2.0 feet was used. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 6 3.0 Proposed Conditions The proposed project consists of the following GSI: • Constructed wetland. The proposed GSI system is designed to meet the following major objective: • Capture and treat to the maximum extent practicable the first one inch of runoff (WQv). 3.1 Drainage Areas The Curve Hill Road site contributing drainage area under proposed conditions is the same as existing conditions, with a total of approximately 13.0 acres. While DA2A and DA2B remain the same, DA1 includes the proposed constructed wetland as a pond so that it can be accurately modeled in HydroCAD. All drainage areas drain to the wetland, modeled as Study Point 1 (SP1), which is the same as existing conditions. See the proposed conditions drainage area map and a detailed breakdown of land cover in Appendix A, as well as the proposed HydroCAD model report in Appendix B. 3.2 Structural Stormwater Control Measures (SCMs) The proposed stormwater management includes a GSI approach to capture, detain, and treat runoff. The stormwater management systems were designed to meet Standard 1, so that no new untreated stormwater runoff will be directed to any off-site areas or resource areas. There is one GSI practice proposed: a constructed wetland. Pretreatment will be provided with a water quality unit. These SCMs are described in more detail below. Pretreatment A proprietary water quality unit (WQU) is proposed for pretreatment of the runoff from the paved surfaces to collect oils, sediment, and other debris prior to discharge into the constructed wetland. Constructed Wetland (CW) Stormwater constructed wetlands mimic natural wetlands to manage and treat stormwater by allowing settling of sediments and filtering stormwater through a mix of native vegetation. The system consists of an inflow component, a series of pools of varying depths, and overflow spillway for discharge. Stormwater is designed to be directed to the stormwater constructed wetland off of Great Western Road through the existing drainage outfall pipe and off of Curve Hill Road via a drop inlet into a water quality unit. Constructed wetlands have depth zone allocations and MASMS provides target allocations (given as percentage of the stormwater wetland surface area) when designing constructed wetlands. The four depth zones include: semi-wet zone (above the normal pool elevation), high marsh zone (ranges from normal pool elevation to 6 inches below normal pool elevation), low marsh zone (ranges from 6 inches Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 7 to 18 inches below the normal pool elevation), and deep water zone (ranges from 1.5 to 6 feet below normal pool elevation). The purpose of the different zones is to support various types of vegetation. The proposed constructed wetland was designed to meet these target design allocations. When designing constructed wetlands, the permanent pool is set at the ESHGW elevation or at the lowest outlet elevation. For this site, an overflow weir is proposed at 7.85 feet, above the ESHGW of 7.5 feet. Thus, the permanent pool of the constructed wetland was conservatively set at 7.85 feet. 4.0 Stormwater Design Components The proposed SCMs were designed to meet a variety of goals and regulatory requirements as discussed above. As a retrofit project for managing existing impervious cover, this design must specifically comply with the redevelopment standard (MASMS Standard 7) by meeting all standards to the maximum extent practicable. The project fully meets this standard, as described in detail below. 4.1 Water Quality The main purpose of this retrofit project is to improve water quality. This section describes the treatment volumes and pollutant load reductions achieved by the proposed design and how they compare to the MASMS standards. Treatment Volume Per Standard 4 of MASMS, the stormwater management system for a new development site must be sized to treat the first one inch of runoff and remove 80% or more of the annual post-construction load of total suspended solids (TSS). As a retrofit (falls under Standard 7 - Redevelopment), the project is only required to meet this to the maximum extent practicable. However, the proposed SCM was sized to treat the full one-inch WQv for the contributing drainage areas (DA1, DA2A, and DA2B). The constructed wetland’s permanent pool (elevation 7.85 feet) can store the full WQv. The proposed HydroCAD model results showing treatment of the water quality volume are included in Appendix B and summarized below in Table 3. Table 3. Compliance with Water Quality Volume (WQV) Requirements DA ID SCM ID IA (ac) WQv Goal (ac-ft) WQv Provided (ac-ft)* % WQv Provided Meets Reqt? Notes DA1 CW 0.28 0.346 0.346 100% Y Full WQv provided within permanent pool. No extended detention used to meet standard. DA2a 0.51 DA2b 3.36 TOTAL SITE: 4.15 0.346 0.346 100% Y *Impervious Area **From HydroCAD results – see Appendix B for storage volume during the WQ Rainfall event for Pond 7P. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 8 Pollutant Load Reductions The proposed constructed wetland meet the MASMS requirements for TSS removal and maximize removals of the other pollutants of concern. Estimated TSS, TP, TN, and bacteria removals for the proposed project are provided in Table 4. The proposed O&M Guide in Appendix D was developed to ensure that the stormwater system continues to function as it was designed into the future to maintain these levels of pollutant removal. Table 4. Compliance with Water Quality Pollutant Load Reduction Requirements DA ID SCM ID IA (ac) WQv Provided (ac-ft)* Runoff Depth Treated (in) TSS Removal (%)** TP Removal (%)*** TN Removal (%)*** Bacteria Removal (%)**** Meets Reqt? DA1 CW 0.28 0.346 1.00 88% 53% 32% 65% Y DA2a 0.51 DA2b 3.36 TOTAL SITE: 4.15 0.346 1.0 88% 53% 32% 65% Y *From HydroCAD results – see Appendix B for storage volume during the WQ Rainfall event for Pond 7P. **From MASMS ***From MS4 NPDES Permit Appendix F Attachment 3 (USEPA 2021) ****From Paradigm Environmental (2019) The project site is partially located within a wellhead protection area (Zone II) and located within the Bass River Watershed and as the project goal is to improve water quality, the proposed constructed wetland was designed to meet MASMS Standard 6. The CDS water quality unit is proposed for pretreatment prior to discharge into the constructed wetland, providing greater than 44% TSS removal. The water quality unit alone provides 87.7% TSS removal. Furthermore, constructed wetlands are recommended treatment SCMs for areas that discharge near to shellfish growing areas and to wellhead protection areas. Therefore, this project meets Standard 6. Long-term Pollution Prevention Plan Source control is important to ensure long-term functionality of the proposed SCMs and protect downstream resources and habitat. A long-term pollution prevention plan specific to this site is provided as a part of the O&M Guide in Appendix D. 4.2 Recharge For new development projects, the MASMS requires a specific annual “recharge” volume (Rev) based on the HSG of the soil covered by new impervious surfaces. However, no new impervious surfaces are proposed for this site as a retrofit project, and recharge is not required due to high groundwater. The proposed SCM was specifically chosen due to this groundwater constraint and therefore, the project does not take credit for recharge. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 9 4.3 Water Quantity The main focus of this project is to improve water quality and habitat, but reducing water quantity impacts during large storm events was also considered. The proposed constructed wetland will reduce peak flows for the 2-, 10-, 25- and 100-year storms. The runoff volume is slightly increased under proposed conditions as there is an increase in impervious cover (e.g., water) from the constructed wetland. The existing and proposed HydroCAD model results for these larger storm events are included in Appendix B, and the resulting peak flows and runoff volumes are summarized below in Table 6 for both existing (EX) and proposed (PR) conditions. These results show that the proposed improvements will reduce peak flows for all evaluated storms thus, meeting the requirements of Standard 2 of the MASMS. Table 5. Summary of Existing and Proposed Condition Peak Flow Rates and Runoff Volumes Study Point Peak Flow, cfs Runoff Volume, acre-ft 2-yr 10-yr 25-yr 100-yr 2-yr 10-yr 25-yr 100-yr SP1 EX 13.98 20.58 26.28 39.41 1.170 1.859 2.485 3.681 PR 12.57 19.05 24.55 37.09 1.228 1.946 2.593 3.817 Reduction % -10% -7% -7% -6% 5% 5% 4% 4% *From HydroCAD results – see Appendix B 4.4 Erosion Control Controlling erosion and sedimentation from the construction site is important to meet the overall water quality goals of this retrofit project, as well as to meet MASMS Standard 8. Given this site’s size (< 1 acre of disturbance), a NPDES Construction General Permit Stormwater Pollution Plan (SWPPP) is not required. However, planning for effective erosion and sediment controls (ESCs) was important to this project’s design, and so an ESC Plan is included in the design plans (Appendix F), along with a detailed sequence of construction activities and ESC notes. Silt socks are proposed along the downgradient edges of the area of disturbance. Regular street sweeping is to be provided along Curve Hill Road to minimize tracking of sediment. Areas for other sediment traps/basins should be provided on an as-needed basis. Dewatering will be required during construction. Dewatering will be conducted in a method to minimize downstream sedimentation and erosion, with use of a dewatering containment area. Disturbed areas will be stabilized as soon as possible to minimize erosion and sedimentation with pavement, seeding and/or erosion control blankets, if necessary. A Pollutant Controls During Construction guide is also included in Appendix E that discusses these controls in more detail. With these layered ESCs implemented throughout the site, discharge of sediment-laden runoff during construction should be minimized to the maximum extent practicable. The contractor will be required to establish these erosion controls prior to beginning any other project- related work. The ESC Plan will also establish the limit of work, beyond which the contractor will not be allowed to perform any work. It is the contractor’s responsibility to monitor and correct erosion control practices throughout the duration of the project. Erosion control measures will not be removed until the project reaches completion as directed by the project engineer or landscape architect. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 10 4.5 Operation and Maintenance Ongoing maintenance is vital for long-term success at the site. The SCM was designed to be low- maintenance in nature. The SCM will be operated and maintained appropriately during construction and post-construction as required on the construction drawings and O&M Guide per MASMS Standard 9 (Appendix D and F). 4.6 Illicit Discharges There will be no illicit discharges to the existing system by the proposed project per MASMS Standard 10. The Long-Term Pollution Prevention Plan in the O&M Guide (Appendix D) includes measures to prevent future illicit discharges. Stormwater Management Report Horsley Witten Group, Inc. Curve Hill Road- Yarmouth Stormwater Design and Implementation Project- Yarmouth, MA September 2024 11 5.0 REFERENCES Association to Preserve Cape Cod. 2022. State of the Waters: Cape Cod Report. Cape Cod Commission. 2006. Technical Bulletin 92-001 “Estimation of High Groundwater Levels for Construction and Land Use Planning.” https://www.capecodcommission.org/resource- library/file/?url=/dept/commission/team/Website_Resources/regulatory/HighGroundH20TechBulletin.p df. Cape Cod Commission. 2015. 208 Plan – Cape Cod’s Area Wide Water Quality Management Plan Updated. Cape Cod Commission. 2024. Estimating High Groundwater Levels Data Viewer. Accessible at: https://cccommission.maps.arcgis.com/apps/webappviewer/index.html?id=f1d0ad5a1b5d44c7976ed6a 9749d2d4a. Massachusetts Department of Environmental Protection (MADEP). 2008. Massachusetts Stormwater Standards Manual. MADEP. 2019. See their homepage at www.state.ma.gov/dep. MassGIS (Massachusetts Office of Geographic and Environmental Information). 2023. See their homepage at: http://www.mass.gov/mgis/. National Oceanic and Atmospheric Administration (NOAA) - National Weather Service (NWS). 2017. Point Precipitation Frequency Estimates: MA. NOAA Atlas 14, Volume 10, Version 3. https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=ma Paradigm Environmental. 2019. USEPA Memo. Tisbury MA Impervious Cover Disconnection (ICD) Project: An Integrated Stormwater Management Approach for Promoting Urban Community Sustainability and Resilience - Task 4D. Develop Planning Level GI SCM Performance Curves for Estimating Cumulative Reductions in SW-Related Indicator Bacteria. Available at: https://www.epa.gov/sites/default/files/2020-01/documents/tisbury-subtask-4d-tm.pdf. USEPA (United States Environmental Protection Agency). 2019. National Pollutant Discharge Elimination System (NPDES). See their homepage at: http://cfpub.epa.gov/NPDES/. USEPA. 2021. National Pollutant Discharge Elimination System (NPDES)-General Permits for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems in Massachusetts (as modified). U.S. Geological Survey (USGS). 2022. Determining High Groundwater Levels in Massachusetts. https://www.usgs.gov/centers/new-england-water-science-center/science/updating-a-method- estimate-probable-high#web-tools. FIGURES APPENDIX A – Drainage Areas • Existing and Proposed Drainage Areas Maps • Land Coverage Summaries 20 20 25 25 30 3 0 35 35 4 0 45454040404030 10 202 5 15152025 30 35 40 35304035451025 30CURVE HILL ROADGREAT WESTERN ROAD4 SEAS O N S D R I V E VIKING ROCK ROAD NARROWS LANE PAINE ROAD Prepared For:Sheet Number:Project Number:last modified: 06/24/24 printed: 06/24/24 by gk H:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD DR.dwg Plan Set:of122108A2Town of Yarmouth DPW Phone: 74 Town Brook Road West Yarmouth, MA 02673 (508) 398-2231 ext. 1250 4/25/24 MCL GK 0SCALE IN FEET150Horsley Witten Group, Inc. Sustainable Environmental Solutions 90 Route 6A Sandwich, MA 02563 horsleywittengroup.comDA1SP1P1STUDY POINTSITE UBR-1: CURVE HILL ROAD SOTRMWATER RETROFIT DESIGN AND IMPLEMENTATION 25% DESIGN PLANS YARMOUTH, MASSACHUSETTS EXISTING DRAINAGE MAPDRAINAGE AREA0.752.00SOIL BOUNDARYTIME OF CONCENTRATION FLOW PATH5' MAJOR CONTOUR1' MINOR CONTOURCARVER COARSE SAND (HSG A)252A 0-3%252B 3-8%252C 8-15%252D 15-35%LEGENDSOIL TYPESPONDChecked By:Drawn By:Date:(ACRES)WOODSROOFTOPGRASSPAVEMENTWATERDRAINAGEAREABOUNDARYIMP. AREATOTAL AREAFREETOWN AND SWANSEAMUCKS 0-1% (HSG D)DA2BSP13.279.01EX DRAINAGE STRUCTUREEX DRAIN PIPEDA2A0.512.10252A52D52D252DA252DA252BA252CA252AA252AA252BA252CA252CADA10.281.89 20 20 25 25 30 3 0 35 35 4 0 45454040404030 10 202 5 15152025 30 35 40 35304035451025 30CURVE HILL ROADGREAT WESTERN ROAD4 SEAS O N S D R I V E VIKING ROCK ROAD NARROWS LANE PAINE ROAD Prepared For:Sheet Number:Project Number:last modified: 06/24/24 printed: 06/24/24 by gk H:\Projects\2022\22108 APCC Yarmouth\Drawings\CURVE HILL\22108A CURVE HILL RD DR.dwg Plan Set:of222108A2Town of Yarmouth DPW Phone: 74 Town Brook Road West Yarmouth, MA 02673 (508) 398-2231 ext. 1250 4/25/24 MCL GK 0SCALE IN FEET150Horsley Witten Group, Inc. Sustainable Environmental Solutions 90 Route 6A Sandwich, MA 02563 horsleywittengroup.comDA1SP1P1STUDY POINTPROPOPOSED DRAINAGE MAPDRAINAGE AREA0.752.00SOIL BOUNDARYTIME OF CONCENTRATION FLOW PATH5' MAJOR CONTOUR1' MINOR CONTOURCARVER COARSE SAND (HSG A)252A 0-3%252B 3-8%252C 8-15%252D 15-35%LEGENDSOIL TYPESPONDChecked By:Drawn By:Date:(ACRES)WOODSROOFTOPGRASSPAVEMENTWATERDRAINAGEAREABOUNDARYIMP. AREATOTAL AREAFREETOWN AND SWANSEAMUCKS 0-1% (HSG D)SP1EX DRAINAGE STRUCTUREEX DRAIN PIPEDA2a0.512.10252A52D52D252DA252DA252BA252CA252AA252AA252BA252CA252CAP1SITE UBR-1: CURVE HILL ROAD SOTRMWATER RETROFIT DESIGN AND IMPLEMENTATION 25% DESIGN PLANS YARMOUTH, MASSACHUSETTSDA10.281.89DA2b3.279.01 CURVE HILL, YARMOUTH STORMWATER Calc'd by: YARMOUTH, MA Checked by: Date: DA1 DA2a WQv 1.21 DA2b 1-yr 3.05 2-yr 3.60 5-yr 4.51 10-yr 5.27 25-yr 6.53 100-yr 8.59 500-yr 11.43 DA1 Cover type Area, ft 2 Area, ac Note Paved 3,469 0.080 Permeable 0.000 Roof 8,516 0.196 Water 0 0.000 Woods 46,010 1.056 Grass 24,504 0.563 Area, ft 2 Area, ac Percent TOTAL 82,499 1.894 11,985 0.275 15 DA2a Cover type Area, ft 2 Area, ac Note Paved 14,426 0.331 Permeable 0 0.000 Roof 7,938 0.182 Water 0.000 Woods 25,978 0.596 Grass 43,234 0.993 Area, ft 2 Area, ac Percent TOTAL 91,576 2.102 22,364 0.513 24 Impervious Curve Hill Road GSG GK 7/15/2024 Wetland Wetland Great Western Road Curve Hill Road Impervious Existing Drainage Conditions DRAINAGE AREAS NOAA 14+ 24-hr Type III (inches) DA2b Cover type Area, ft 2 Area, ac Note Paved 110,080 2.527 Permeable 0 0.000 Roof 35,831 0.823 Water 394 0.009 Woods 81,217 1.864 Grass 165,043 3.789 Area, ft 2 Area, ac Percent TOTAL 392,565 9.012 146,305 3.359 37 ALL Cover type Area, ft 2 Area, ac Note Paved 127,975 2.938 Permeable 0 0.000 Roof 52,285 0.378 Water 394 0.000 Woods 153,205 1.653 Grass 232,781 1.555 Area, ft 2 Area, ac Percent TOTAL 566,640 13.008 180,654 4.147 32 ALL EX AREAS COMBINED Impervious Great Western Road Impervious CURVE HILL, YARMOUTH STORMWATER Calc'd by: YARMOUTH, MA Checked by: Date: DA1 DA2a WQv 1.21 DA2b 1-yr 3.05 2-yr 3.60 5-yr 4.51 10-yr 5.27 25-yr 6.53 100-yr 8.59 500-yr 11.43 DA1 Cover type Area, ft 2 Area, ac Note Paved 3,469 0.080 Permeable 0.000 Roof 8,516 0.196 Water 9,145 0.210 Woods 36,865 0.846 Grass 24,504 0.563 Area, ft 2 Area, ac Percent TOTAL 82,499 1.894 11,985 0.275 15 DA2a Cover type Area, ft 2 Area, ac Note Paved 14,426 0.331 Permeable 0 0.000 Roof 7,938 0.182 Water 0.000 Woods 25,978 0.596 Grass 43,234 0.993 Area, ft 2 Area, ac Percent TOTAL 91,576 2.102 22,364 0.513 24 Wetland Impervious Curve Hill Road Impervious GK Proposed Drainage Conditions DRAINAGE AREAS NOAA 14+ Wetland 24-hr Type III (inches) Curve Hill Road Great Western Road DA2b Cover type Area, ft 2 Area, ac Note Paved 110,080 2.527 Permeable 0 0.000 Roof 35,831 0.823 Water 394 0.009 Woods 81,217 1.864 Grass 165,043 3.789 Area, ft 2 Area, ac Percent TOTAL 392,565 9.012 146,305 3.359 37 ALL Cover type Area, ft 2 Area, ac Note Paved 127,975 2.938 Permeable 0 0.000 Roof 52,285 1.200 Water 9,539 0.219 Woods 144,060 3.307 Grass 232,781 5.344 Area, ft 2 Area, ac Percent TOTAL 566,640 13.008 180,260 4.138 32 ALL PR AREAS COMBINED Impervious Impervious Great Western Road APPENDIX B – Hydrologic/Hydraulic Model Results HydroCAD® Results • Existing • Proposed Contech Water Quality Unit Removal Calculations DA1 0.28/1.89 DA2A 0.51/2.10 DA2B 3.36/9.01 1P Curve Hill Wetland Routing Diagram for 22108 CURVE EX_reportPrepared by Horsley Witten Inc, Printed 9/17/2024 HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link 22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 2HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 2 YR Type III 24-hr Default 24.00 1 3.60 2 2 10 YR Type III 24-hr Default 24.00 1 5.27 2 3 25 YR Type III 24-hr Default 24.00 1 6.53 2 4 100 YR Type III 24-hr Default 24.00 1 8.59 2 5 WQ Type III 24-hr Default 24.00 1 1.21 2 22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 3HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 5.344 39 >75% Grass cover, Good, HSG A (DA1, DA2A, DA2B) 0.080 98 Paved parking, HSG A (DA1) 1.200 98 Roofs, HSG A (DA1, DA2A, DA2B) 2.858 98 Unconnected pavement, HSG A (DA2A, DA2B) 0.009 98 Water Surface, HSG A (DA2B) 3.517 30 Woods, Good, HSG A (DA1, DA2A, DA2B) 13.008 55 TOTAL AREA 22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 4HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 13.008 HSG A DA1, DA2A, DA2B 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.000 Other 13.008 TOTAL AREA 22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 5HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 5.344 0.000 0.000 0.000 0.000 5.344 >75% Grass cover, Good DA1, DA2A, DA2B 0.080 0.000 0.000 0.000 0.000 0.080 Paved parking DA1 1.200 0.000 0.000 0.000 0.000 1.200 Roofs DA1, DA2A, DA2B 2.858 0.000 0.000 0.000 0.000 2.858 Unconnected pavement DA2A, DA2B 0.009 0.000 0.000 0.000 0.000 0.009 Water Surface DA2B 3.517 0.000 0.000 0.000 0.000 3.517 Woods, Good DA1, DA2A, DA2B 13.008 0.000 0.000 0.000 0.000 13.008 TOTAL AREA 22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 6HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) Node Name 1 DA2B 0.00 0.00 1,259.0 0.0300 0.013 0.0 12.0 0.0 Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 7HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=0.49"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=0.93 cfs 0.078 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=0.83"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=1.73 cfs 0.145 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=1.26"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=11.32 cfs 0.947 af Inflow=13.98 cfs 1.170 afPond 1P: Curve Hill Wetland Primary=13.98 cfs 1.170 af Total Runoff Area = 13.008 ac Runoff Volume = 1.170 af Average Runoff Depth = 1.08" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 8HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 0.93 cfs @ 12.10 hrs, Volume= 0.078 af, Depth= 0.49" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 46,010 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=82,499 sf Runoff Volume=0.078 af Runoff Depth=0.49" Tc=7.1 min CN=WQ 0.93 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 9HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 1.73 cfs @ 12.10 hrs, Volume= 0.145 af, Depth= 0.83" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=91,576 sf Runoff Volume=0.145 af Runoff Depth=0.83" Tc=7.1 min UI Adjusted CN=WQ 1.73 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 10HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 183% of capacity of segment #3 Runoff = 11.32 cfs @ 12.10 hrs, Volume= 0.947 af, Depth= 1.26" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 11HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=392,565 sf Runoff Volume=0.947 af Runoff Depth=1.26" Flow Length=1,733' Tc=7.1 min CN=WQ 11.32 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 12HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Curve Hill Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.08" for 2 YR event Inflow = 13.98 cfs @ 12.10 hrs, Volume= 1.170 af Primary = 13.98 cfs @ 12.10 hrs, Volume= 1.170 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 1P: Curve Hill Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac 13.98 cfs13.98 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 13HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=0.82"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=1.37 cfs 0.129 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=1.36"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=2.55 cfs 0.237 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=1.99"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=16.67 cfs 1.492 af Inflow=20.58 cfs 1.859 afPond 1P: Curve Hill Wetland Primary=20.58 cfs 1.859 af Total Runoff Area = 13.008 ac Runoff Volume = 1.859 af Average Runoff Depth = 1.71" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 14HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 1.37 cfs @ 12.10 hrs, Volume= 0.129 af, Depth= 0.82" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 46,010 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=82,499 sf Runoff Volume=0.129 af Runoff Depth=0.82" Tc=7.1 min CN=WQ 1.37 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 15HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 2.55 cfs @ 12.10 hrs, Volume= 0.237 af, Depth= 1.36" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)2 1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=91,576 sf Runoff Volume=0.237 af Runoff Depth=1.36" Tc=7.1 min UI Adjusted CN=WQ 2.55 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 16HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 270% of capacity of segment #3 Runoff = 16.67 cfs @ 12.10 hrs, Volume= 1.492 af, Depth= 1.99" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 17HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=392,565 sf Runoff Volume=1.492 af Runoff Depth=1.99" Flow Length=1,733' Tc=7.1 min CN=WQ 16.67 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 18HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Curve Hill Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.71" for 10 YR event Inflow = 20.58 cfs @ 12.10 hrs, Volume= 1.859 af Primary = 20.58 cfs @ 12.10 hrs, Volume= 1.859 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 1P: Curve Hill Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac 20.58 cfs20.58 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 19HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=1.17"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=1.77 cfs 0.185 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=1.86"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=3.30 cfs 0.326 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=2.63"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=21.21 cfs 1.974 af Inflow=26.28 cfs 2.485 afPond 1P: Curve Hill Wetland Primary=26.28 cfs 2.485 af Total Runoff Area = 13.008 ac Runoff Volume = 2.485 af Average Runoff Depth = 2.29" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 20HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 1.77 cfs @ 12.10 hrs, Volume= 0.185 af, Depth= 1.17" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 46,010 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=82,499 sf Runoff Volume=0.185 af Runoff Depth=1.17" Tc=7.1 min CN=WQ 1.77 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 21HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 3.30 cfs @ 12.10 hrs, Volume= 0.326 af, Depth= 1.86" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=91,576 sf Runoff Volume=0.326 af Runoff Depth=1.86" Tc=7.1 min UI Adjusted CN=WQ 3.30 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 22HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 344% of capacity of segment #3 Runoff = 21.21 cfs @ 12.10 hrs, Volume= 1.974 af, Depth= 2.63" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 23HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=392,565 sf Runoff Volume=1.974 af Runoff Depth=2.63" Flow Length=1,733' Tc=7.1 min CN=WQ 21.21 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 24HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Curve Hill Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 2.29" for 25 YR event Inflow = 26.28 cfs @ 12.10 hrs, Volume= 2.485 af Primary = 26.28 cfs @ 12.10 hrs, Volume= 2.485 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 1P: Curve Hill Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac 26.28 cfs26.28 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 25HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=1.95"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=2.85 cfs 0.307 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=2.87"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=5.24 cfs 0.502 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=3.82"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=31.32 cfs 2.871 af Inflow=39.41 cfs 3.681 afPond 1P: Curve Hill Wetland Primary=39.41 cfs 3.681 af Total Runoff Area = 13.008 ac Runoff Volume = 3.681 af Average Runoff Depth = 3.40" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 26HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 2.85 cfs @ 12.11 hrs, Volume= 0.307 af, Depth= 1.95" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 46,010 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=82,499 sf Runoff Volume=0.307 af Runoff Depth=1.95" Tc=7.1 min CN=WQ 2.85 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 27HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 5.24 cfs @ 12.11 hrs, Volume= 0.502 af, Depth= 2.87" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=91,576 sf Runoff Volume=0.502 af Runoff Depth=2.87" Tc=7.1 min UI Adjusted CN=WQ 5.24 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 28HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 508% of capacity of segment #3 Runoff = 31.32 cfs @ 12.10 hrs, Volume= 2.871 af, Depth= 3.82" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 29HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=392,565 sf Runoff Volume=2.871 af Runoff Depth=3.82" Flow Length=1,733' Tc=7.1 min CN=WQ 31.32 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 30HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Curve Hill Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 3.40" for 100 YR event Inflow = 39.41 cfs @ 12.10 hrs, Volume= 3.681 af Primary = 39.41 cfs @ 12.10 hrs, Volume= 3.681 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 1P: Curve Hill Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac 39.41 cfs39.41 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 31HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=0.14"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=0.29 cfs 0.023 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=0.24"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=0.55 cfs 0.043 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=0.37"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=3.57 cfs 0.279 af Inflow=4.41 cfs 0.344 afPond 1P: Curve Hill Wetland Primary=4.41 cfs 0.344 af Total Runoff Area = 13.008 ac Runoff Volume = 0.344 af Average Runoff Depth = 0.32" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 32HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 0.29 cfs @ 12.10 hrs, Volume= 0.023 af, Depth= 0.14" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 46,010 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=82,499 sf Runoff Volume=0.023 af Runoff Depth=0.14" Tc=7.1 min CN=WQ 0.29 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 33HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 0.55 cfs @ 12.10 hrs, Volume= 0.043 af, Depth= 0.24" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=91,576 sf Runoff Volume=0.043 af Runoff Depth=0.24" Tc=7.1 min UI Adjusted CN=WQ 0.55 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 34HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 Runoff = 3.57 cfs @ 12.10 hrs, Volume= 0.279 af, Depth= 0.37" Routed to Pond 1P : Curve Hill Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 35HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=392,565 sf Runoff Volume=0.279 af Runoff Depth=0.37" Flow Length=1,733' Tc=7.1 min CN=WQ 3.57 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE EX_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 36HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 1P: Curve Hill Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 0.32" for WQ event Inflow = 4.41 cfs @ 12.10 hrs, Volume= 0.344 af Primary = 4.41 cfs @ 12.10 hrs, Volume= 0.344 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 1P: Curve Hill Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)4 3 2 1 0 Inflow Area=13.008 ac 4.41 cfs4.41 cfs DA1 0.28/1.89 DA2A 0.51/2.10 DA2B 3.36/9.01 3PCB CDS Unit 4P Existing Wetland 7P Constructed Wetland Routing Diagram for 22108 CURVE PR_reportPrepared by Horsley Witten Inc, Printed 9/17/2024 HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link 22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 2HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 2 YR Type III 24-hr Default 24.00 1 3.60 2 2 10 YR Type III 24-hr Default 24.00 1 5.27 2 3 25 YR Type III 24-hr Default 24.00 1 6.53 2 4 100 YR Type III 24-hr Default 24.00 1 8.59 2 5 WQ Type III 24-hr Default 24.00 1 1.21 2 22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 3HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 5.344 39 >75% Grass cover, Good, HSG A (DA1, DA2A, DA2B) 0.080 98 Paved parking, HSG A (DA1) 1.200 98 Roofs, HSG A (DA1, DA2A, DA2B) 2.858 98 Unconnected pavement, HSG A (DA2A, DA2B) 0.210 98 Water Surface, 0% imp, HSG A (DA1) 0.009 98 Water Surface, HSG A (DA2B) 3.307 30 Woods, Good, HSG A (DA1, DA2A, DA2B) 13.008 56 TOTAL AREA 22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 4HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 13.008 HSG A DA1, DA2A, DA2B 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.000 Other 13.008 TOTAL AREA 22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 5HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 5.344 0.000 0.000 0.000 0.000 5.344 >75% Grass cover, Good DA1, DA2A, DA2B 0.080 0.000 0.000 0.000 0.000 0.080 Paved parking DA1 1.200 0.000 0.000 0.000 0.000 1.200 Roofs DA1, DA2A, DA2B 2.858 0.000 0.000 0.000 0.000 2.858 Unconnected pavement DA2A, DA2B 0.009 0.000 0.000 0.000 0.000 0.009 Water Surface DA2B 0.210 0.000 0.000 0.000 0.000 0.210 Water Surface, 0% imp DA1 3.307 0.000 0.000 0.000 0.000 3.307 Woods, Good DA1, DA2A, DA2B 13.008 0.000 0.000 0.000 0.000 13.008 TOTAL AREA 22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 6HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) Node Name 1 DA2B 0.00 0.00 1,259.0 0.0300 0.013 0.0 12.0 0.0 2 3P 7.50 7.00 36.0 0.0139 0.013 0.0 24.0 0.0 Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 7HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=0.87"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=1.63 cfs 0.137 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=0.83"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=1.73 cfs 0.145 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=1.26"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=11.32 cfs 0.947 af Peak Elev=9.69' Inflow=13.05 cfs 1.092 afPond 3P: CDS Unit 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' Outflow=13.05 cfs 1.092 af Inflow=12.57 cfs 1.228 afPond 4P: Existing Wetland Primary=12.57 cfs 1.228 af Peak Elev=8.33' Storage=19,781 cf Inflow=14.69 cfs 1.228 afPond 7P: Constructed Wetland Outflow=12.57 cfs 1.228 af Total Runoff Area = 13.008 ac Runoff Volume = 1.228 af Average Runoff Depth = 1.13" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 8HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 1.63 cfs @ 12.10 hrs, Volume= 0.137 af, Depth= 0.87" Routed to Pond 7P : Constructed Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 36,865 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 9,145 98 Water Surface, 0% imp, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=82,499 sf Runoff Volume=0.137 af Runoff Depth=0.87" Tc=7.1 min CN=WQ 1.63 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 9HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 1.73 cfs @ 12.10 hrs, Volume= 0.145 af, Depth= 0.83" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=91,576 sf Runoff Volume=0.145 af Runoff Depth=0.83" Tc=7.1 min UI Adjusted CN=WQ 1.73 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 10HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 183% of capacity of segment #3 Runoff = 11.32 cfs @ 12.10 hrs, Volume= 0.947 af, Depth= 1.26" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 2 YR Rainfall=3.60" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 11HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 2 YR Rainfall=3.60" Runoff Area=392,565 sf Runoff Volume=0.947 af Runoff Depth=1.26" Flow Length=1,733' Tc=7.1 min CN=WQ 11.32 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 12HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 3P: CDS Unit [57] Hint: Peaked at 9.69' (Flood elevation advised) Inflow Area = 11.114 ac, 34.84% Impervious, Inflow Depth = 1.18" for 2 YR event Inflow = 13.05 cfs @ 12.10 hrs, Volume= 1.092 af Outflow = 13.05 cfs @ 12.10 hrs, Volume= 1.092 af, Atten= 0%, Lag= 0.0 min Primary = 13.05 cfs @ 12.10 hrs, Volume= 1.092 af Routed to Pond 7P : Constructed Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 9.69' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 7.50'24.0" Round Culvert L= 36.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 7.50' / 7.00' S= 0.0139 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=13.02 cfs @ 12.10 hrs HW=9.69' TW=7.50' (Fixed TW Elev= 7.50') 1=Culvert (Inlet Controls 13.02 cfs @ 4.14 fps) Pond 3P: CDS Unit Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=11.114 ac Peak Elev=9.69' 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' 13.05 cfs13.05 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 13HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: Existing Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.13" for 2 YR event Inflow = 12.57 cfs @ 12.15 hrs, Volume= 1.228 af Primary = 12.57 cfs @ 12.15 hrs, Volume= 1.228 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 4P: Existing Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac 12.57 cfs12.57 cfs Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 14HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: Constructed Wetland [81] Warning: Exceeded Pond 3P by 0.36' @ 24.40 hrs Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.13" for 2 YR event Inflow = 14.69 cfs @ 12.10 hrs, Volume= 1.228 af Outflow = 12.57 cfs @ 12.15 hrs, Volume= 1.228 af, Atten= 14%, Lag= 3.1 min Primary = 12.57 cfs @ 12.15 hrs, Volume= 1.228 af Routed to Pond 4P : Existing Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Starting Elev= 7.85' Surf.Area= 9,158 sf Storage= 15,149 cf Peak Elev= 8.33' @ 12.15 hrs Surf.Area= 10,013 sf Storage= 19,781 cf (4,632 cf above start) Plug-Flow detention time= 183.9 min calculated for 0.881 af (72% of inflow) Center-of-Mass det. time= 13.0 min ( 770.4 - 757.3 ) Volume Invert Avail.Storage Storage Description #1 3.00' 38,706 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 3.00 304 0 0 4.00 822 563 563 5.00 1,688 1,255 1,818 6.00 3,104 2,396 4,214 7.00 6,142 4,623 8,837 7.35 6,936 2,289 11,126 7.85 9,158 4,024 15,149 8.00 9,416 1,393 16,542 9.00 11,206 10,311 26,853 10.00 12,500 11,853 38,706 Device Routing Invert Outlet Devices #1 Primary 7.85'13.0' long + 3.0 '/' SideZ x 11.2' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.54 2.59 2.70 2.68 2.67 2.68 2.66 2.64 Primary OutFlow Max=12.49 cfs @ 12.15 hrs HW=8.33' TW=7.85' (Fixed TW Elev= 7.85') 1=Broad-Crested Rectangular Weir (Weir Controls 12.49 cfs @ 1.79 fps) Type III 24-hr 2 YR Rainfall=3.60"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 15HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pond 7P: Constructed Wetland Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac Peak Elev=8.33' Storage=19,781 cf 14.69 cfs 12.57 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 16HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=1.37"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=2.41 cfs 0.217 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=1.36"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=2.55 cfs 0.237 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=1.99"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=16.67 cfs 1.492 af Peak Elev=11.09' Inflow=19.21 cfs 1.730 afPond 3P: CDS Unit 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' Outflow=19.21 cfs 1.730 af Inflow=19.05 cfs 1.946 afPond 4P: Existing Wetland Primary=19.05 cfs 1.946 af Peak Elev=8.47' Storage=21,156 cf Inflow=21.62 cfs 1.946 afPond 7P: Constructed Wetland Outflow=19.05 cfs 1.946 af Total Runoff Area = 13.008 ac Runoff Volume = 1.946 af Average Runoff Depth = 1.80" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 17HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 2.41 cfs @ 12.10 hrs, Volume= 0.217 af, Depth= 1.37" Routed to Pond 7P : Constructed Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 36,865 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 9,145 98 Water Surface, 0% imp, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)2 1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=82,499 sf Runoff Volume=0.217 af Runoff Depth=1.37" Tc=7.1 min CN=WQ 2.41 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 18HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 2.55 cfs @ 12.10 hrs, Volume= 0.237 af, Depth= 1.36" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)2 1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=91,576 sf Runoff Volume=0.237 af Runoff Depth=1.36" Tc=7.1 min UI Adjusted CN=WQ 2.55 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 19HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 270% of capacity of segment #3 Runoff = 16.67 cfs @ 12.10 hrs, Volume= 1.492 af, Depth= 1.99" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 10 YR Rainfall=5.27" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 20HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 10 YR Rainfall=5.27" Runoff Area=392,565 sf Runoff Volume=1.492 af Runoff Depth=1.99" Flow Length=1,733' Tc=7.1 min CN=WQ 16.67 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 21HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 3P: CDS Unit [57] Hint: Peaked at 11.09' (Flood elevation advised) Inflow Area = 11.114 ac, 34.84% Impervious, Inflow Depth = 1.87" for 10 YR event Inflow = 19.21 cfs @ 12.10 hrs, Volume= 1.730 af Outflow = 19.21 cfs @ 12.10 hrs, Volume= 1.730 af, Atten= 0%, Lag= 0.0 min Primary = 19.21 cfs @ 12.10 hrs, Volume= 1.730 af Routed to Pond 7P : Constructed Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 11.09' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 7.50'24.0" Round Culvert L= 36.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 7.50' / 7.00' S= 0.0139 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=19.16 cfs @ 12.10 hrs HW=11.07' TW=7.50' (Fixed TW Elev= 7.50') 1=Culvert (Inlet Controls 19.16 cfs @ 6.10 fps) Pond 3P: CDS Unit Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=11.114 ac Peak Elev=11.09' 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' 19.21 cfs19.21 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 22HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: Existing Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.80" for 10 YR event Inflow = 19.05 cfs @ 12.14 hrs, Volume= 1.946 af Primary = 19.05 cfs @ 12.14 hrs, Volume= 1.946 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 4P: Existing Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac 19.05 cfs19.05 cfs Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 23HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: Constructed Wetland [81] Warning: Exceeded Pond 3P by 0.37' @ 24.40 hrs Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 1.80" for 10 YR event Inflow = 21.62 cfs @ 12.10 hrs, Volume= 1.946 af Outflow = 19.05 cfs @ 12.14 hrs, Volume= 1.946 af, Atten= 12%, Lag= 2.8 min Primary = 19.05 cfs @ 12.14 hrs, Volume= 1.946 af Routed to Pond 4P : Existing Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Starting Elev= 7.85' Surf.Area= 9,158 sf Storage= 15,149 cf Peak Elev= 8.47' @ 12.14 hrs Surf.Area= 10,256 sf Storage= 21,156 cf (6,007 cf above start) Plug-Flow detention time= 151.3 min calculated for 1.599 af (82% of inflow) Center-of-Mass det. time= 11.9 min ( 775.6 - 763.8 ) Volume Invert Avail.Storage Storage Description #1 3.00' 38,706 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 3.00 304 0 0 4.00 822 563 563 5.00 1,688 1,255 1,818 6.00 3,104 2,396 4,214 7.00 6,142 4,623 8,837 7.35 6,936 2,289 11,126 7.85 9,158 4,024 15,149 8.00 9,416 1,393 16,542 9.00 11,206 10,311 26,853 10.00 12,500 11,853 38,706 Device Routing Invert Outlet Devices #1 Primary 7.85'13.0' long + 3.0 '/' SideZ x 11.2' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.54 2.59 2.70 2.68 2.67 2.68 2.66 2.64 Primary OutFlow Max=18.98 cfs @ 12.14 hrs HW=8.47' TW=7.85' (Fixed TW Elev= 7.85') 1=Broad-Crested Rectangular Weir (Weir Controls 18.98 cfs @ 2.07 fps) Type III 24-hr 10 YR Rainfall=5.27"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 24HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pond 7P: Constructed Wetland Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=13.008 ac Peak Elev=8.47' Storage=21,156 cf 21.62 cfs 19.05 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 25HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=1.85"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=3.07 cfs 0.293 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=1.86"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=3.30 cfs 0.326 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=2.63"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=21.21 cfs 1.974 af Peak Elev=12.71' Inflow=24.51 cfs 2.300 afPond 3P: CDS Unit 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' Outflow=24.51 cfs 2.300 af Inflow=24.55 cfs 2.593 afPond 4P: Existing Wetland Primary=24.55 cfs 2.593 af Peak Elev=8.58' Storage=22,265 cf Inflow=27.57 cfs 2.593 afPond 7P: Constructed Wetland Outflow=24.55 cfs 2.593 af Total Runoff Area = 13.008 ac Runoff Volume = 2.593 af Average Runoff Depth = 2.39" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 26HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 3.07 cfs @ 12.10 hrs, Volume= 0.293 af, Depth= 1.85" Routed to Pond 7P : Constructed Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 36,865 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 9,145 98 Water Surface, 0% imp, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=82,499 sf Runoff Volume=0.293 af Runoff Depth=1.85" Tc=7.1 min CN=WQ 3.07 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 27HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 3.30 cfs @ 12.10 hrs, Volume= 0.326 af, Depth= 1.86" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=91,576 sf Runoff Volume=0.326 af Runoff Depth=1.86" Tc=7.1 min UI Adjusted CN=WQ 3.30 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 28HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 344% of capacity of segment #3 Runoff = 21.21 cfs @ 12.10 hrs, Volume= 1.974 af, Depth= 2.63" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 25 YR Rainfall=6.53" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 29HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type III 24-hr 25 YR Rainfall=6.53" Runoff Area=392,565 sf Runoff Volume=1.974 af Runoff Depth=2.63" Flow Length=1,733' Tc=7.1 min CN=WQ 21.21 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 30HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 3P: CDS Unit [57] Hint: Peaked at 12.71' (Flood elevation advised) Inflow Area = 11.114 ac, 34.84% Impervious, Inflow Depth = 2.48" for 25 YR event Inflow = 24.51 cfs @ 12.10 hrs, Volume= 2.300 af Outflow = 24.51 cfs @ 12.10 hrs, Volume= 2.300 af, Atten= 0%, Lag= 0.0 min Primary = 24.51 cfs @ 12.10 hrs, Volume= 2.300 af Routed to Pond 7P : Constructed Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 12.71' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 7.50'24.0" Round Culvert L= 36.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 7.50' / 7.00' S= 0.0139 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=24.47 cfs @ 12.10 hrs HW=12.70' TW=7.50' (Fixed TW Elev= 7.50') 1=Culvert (Inlet Controls 24.47 cfs @ 7.79 fps) Pond 3P: CDS Unit Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=11.114 ac Peak Elev=12.71' 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' 24.51 cfs24.51 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 31HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: Existing Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 2.39" for 25 YR event Inflow = 24.55 cfs @ 12.15 hrs, Volume= 2.593 af Primary = 24.55 cfs @ 12.15 hrs, Volume= 2.593 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 4P: Existing Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac 24.55 cfs24.55 cfs Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 32HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: Constructed Wetland [81] Warning: Exceeded Pond 3P by 0.37' @ 24.40 hrs Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 2.39" for 25 YR event Inflow = 27.57 cfs @ 12.10 hrs, Volume= 2.593 af Outflow = 24.55 cfs @ 12.15 hrs, Volume= 2.593 af, Atten= 11%, Lag= 2.7 min Primary = 24.55 cfs @ 12.15 hrs, Volume= 2.593 af Routed to Pond 4P : Existing Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Starting Elev= 7.85' Surf.Area= 9,158 sf Storage= 15,149 cf Peak Elev= 8.58' @ 12.15 hrs Surf.Area= 10,447 sf Storage= 22,265 cf (7,116 cf above start) Plug-Flow detention time= 128.9 min calculated for 2.245 af (87% of inflow) Center-of-Mass det. time= 11.0 min ( 781.4 - 770.4 ) Volume Invert Avail.Storage Storage Description #1 3.00' 38,706 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 3.00 304 0 0 4.00 822 563 563 5.00 1,688 1,255 1,818 6.00 3,104 2,396 4,214 7.00 6,142 4,623 8,837 7.35 6,936 2,289 11,126 7.85 9,158 4,024 15,149 8.00 9,416 1,393 16,542 9.00 11,206 10,311 26,853 10.00 12,500 11,853 38,706 Device Routing Invert Outlet Devices #1 Primary 7.85'13.0' long + 3.0 '/' SideZ x 11.2' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.54 2.59 2.70 2.68 2.67 2.68 2.66 2.64 Primary OutFlow Max=24.42 cfs @ 12.15 hrs HW=8.57' TW=7.85' (Fixed TW Elev= 7.85') 1=Broad-Crested Rectangular Weir (Weir Controls 24.42 cfs @ 2.22 fps) Type III 24-hr 25 YR Rainfall=6.53"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 33HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pond 7P: Constructed Wetland Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac Peak Elev=8.58' Storage=22,265 cf 27.57 cfs 24.55 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 34HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=2.81"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=4.55 cfs 0.444 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=2.87"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=5.24 cfs 0.502 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=3.82"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=31.32 cfs 2.871 af Peak Elev=17.87' Inflow=36.56 cfs 3.373 afPond 3P: CDS Unit 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' Outflow=36.56 cfs 3.373 af Inflow=37.09 cfs 3.817 afPond 4P: Existing Wetland Primary=37.09 cfs 3.817 af Peak Elev=8.79' Storage=24,523 cf Inflow=41.11 cfs 3.817 afPond 7P: Constructed Wetland Outflow=37.09 cfs 3.817 af Total Runoff Area = 13.008 ac Runoff Volume = 3.817 af Average Runoff Depth = 3.52" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 35HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 4.55 cfs @ 12.10 hrs, Volume= 0.444 af, Depth= 2.81" Routed to Pond 7P : Constructed Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 36,865 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 9,145 98 Water Surface, 0% imp, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=82,499 sf Runoff Volume=0.444 af Runoff Depth=2.81" Tc=7.1 min CN=WQ 4.55 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 36HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 5.24 cfs @ 12.11 hrs, Volume= 0.502 af, Depth= 2.87" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=91,576 sf Runoff Volume=0.502 af Runoff Depth=2.87" Tc=7.1 min UI Adjusted CN=WQ 5.24 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 37HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 [47] Hint: Peak is 508% of capacity of segment #3 Runoff = 31.32 cfs @ 12.10 hrs, Volume= 2.871 af, Depth= 3.82" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr 100 YR Rainfall=8.59" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 38HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type III 24-hr 100 YR Rainfall=8.59" Runoff Area=392,565 sf Runoff Volume=2.871 af Runoff Depth=3.82" Flow Length=1,733' Tc=7.1 min CN=WQ 31.32 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 39HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 3P: CDS Unit [57] Hint: Peaked at 17.87' (Flood elevation advised) Inflow Area = 11.114 ac, 34.84% Impervious, Inflow Depth = 3.64" for 100 YR event Inflow = 36.56 cfs @ 12.10 hrs, Volume= 3.373 af Outflow = 36.56 cfs @ 12.10 hrs, Volume= 3.373 af, Atten= 0%, Lag= 0.0 min Primary = 36.56 cfs @ 12.10 hrs, Volume= 3.373 af Routed to Pond 7P : Constructed Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 17.87' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 7.50'24.0" Round Culvert L= 36.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 7.50' / 7.00' S= 0.0139 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=36.44 cfs @ 12.10 hrs HW=17.81' TW=7.50' (Fixed TW Elev= 7.50') 1=Culvert (Inlet Controls 36.44 cfs @ 11.60 fps) Pond 3P: CDS Unit Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=11.114 ac Peak Elev=17.87' 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' 36.56 cfs36.56 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 40HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: Existing Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 3.52" for 100 YR event Inflow = 37.09 cfs @ 12.15 hrs, Volume= 3.817 af Primary = 37.09 cfs @ 12.15 hrs, Volume= 3.817 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 4P: Existing Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac 37.09 cfs37.09 cfs Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 41HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: Constructed Wetland [81] Warning: Exceeded Pond 3P by 0.38' @ 24.38 hrs Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 3.52" for 100 YR event Inflow = 41.11 cfs @ 12.10 hrs, Volume= 3.817 af Outflow = 37.09 cfs @ 12.15 hrs, Volume= 3.817 af, Atten= 10%, Lag= 2.6 min Primary = 37.09 cfs @ 12.15 hrs, Volume= 3.817 af Routed to Pond 4P : Existing Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Starting Elev= 7.85' Surf.Area= 9,158 sf Storage= 15,149 cf Peak Elev= 8.79' @ 12.15 hrs Surf.Area= 10,827 sf Storage= 24,523 cf (9,374 cf above start) Plug-Flow detention time= 99.5 min calculated for 3.468 af (91% of inflow) Center-of-Mass det. time= 9.7 min ( 787.3 - 777.6 ) Volume Invert Avail.Storage Storage Description #1 3.00' 38,706 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 3.00 304 0 0 4.00 822 563 563 5.00 1,688 1,255 1,818 6.00 3,104 2,396 4,214 7.00 6,142 4,623 8,837 7.35 6,936 2,289 11,126 7.85 9,158 4,024 15,149 8.00 9,416 1,393 16,542 9.00 11,206 10,311 26,853 10.00 12,500 11,853 38,706 Device Routing Invert Outlet Devices #1 Primary 7.85'13.0' long + 3.0 '/' SideZ x 11.2' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.54 2.59 2.70 2.68 2.67 2.68 2.66 2.64 Primary OutFlow Max=36.92 cfs @ 12.15 hrs HW=8.79' TW=7.85' (Fixed TW Elev= 7.85') 1=Broad-Crested Rectangular Weir (Weir Controls 36.92 cfs @ 2.49 fps) Type III 24-hr 100 YR Rainfall=8.59"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 42HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pond 7P: Constructed Wetland Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=13.008 ac Peak Elev=8.79' Storage=24,523 cf 41.11 cfs 37.09 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 43HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.02 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=82,499 sf 14.53% Impervious Runoff Depth=0.25"Subcatchment DA1: 0.28/1.89 Tc=7.1 min CN=WQ Runoff=0.52 cfs 0.040 af Runoff Area=91,576 sf 24.42% Impervious Runoff Depth=0.24"Subcatchment DA2A: 0.51/2.10 Tc=7.1 min UI Adjusted CN=WQ Runoff=0.55 cfs 0.043 af Runoff Area=392,565 sf 37.27% Impervious Runoff Depth=0.37"Subcatchment DA2B: 3.36/9.01 Flow Length=1,733' Tc=7.1 min CN=WQ Runoff=3.57 cfs 0.279 af Peak Elev=8.49' Inflow=4.12 cfs 0.321 afPond 3P: CDS Unit 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' Outflow=4.12 cfs 0.321 af Inflow=3.52 cfs 0.361 afPond 4P: Existing Wetland Primary=3.52 cfs 0.361 af Peak Elev=8.07' Storage=17,179 cf Inflow=4.63 cfs 0.361 afPond 7P: Constructed Wetland Outflow=3.52 cfs 0.361 af Total Runoff Area = 13.008 ac Runoff Volume = 0.361 af Average Runoff Depth = 0.33" 68.12% Pervious = 8.861 ac 31.88% Impervious = 4.147 ac Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 44HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA1: 0.28/1.89 Runoff = 0.52 cfs @ 12.10 hrs, Volume= 0.040 af, Depth= 0.25" Routed to Pond 7P : Constructed Wetland Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Description 3,469 98 Paved parking, HSG A 8,516 98 Roofs, HSG A 36,865 30 Woods, Good, HSG A 24,504 39 >75% Grass cover, Good, HSG A 9,145 98 Water Surface, 0% imp, HSG A 82,499 Weighted Average 70,514 85.47% Pervious Area 11,985 14.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA1: 0.28/1.89 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=82,499 sf Runoff Volume=0.040 af Runoff Depth=0.25" Tc=7.1 min CN=WQ 0.52 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 45HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2A: 0.51/2.10 Runoff = 0.55 cfs @ 12.10 hrs, Volume= 0.043 af, Depth= 0.24" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Adj Description 14,426 98 98 Unconnected pavement, HSG A 7,938 98 98 Roofs, HSG A 25,978 30 30 Woods, Good, HSG A 43,234 39 39 >75% Grass cover, Good, HSG A 91,576 Weighted Average 69,212 75.58% Pervious Area 22,364 24.42% Impervious Area 14,426 64.51% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 Direct Entry, From DA 2B Subcatchment DA2A: 0.51/2.10 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=91,576 sf Runoff Volume=0.043 af Runoff Depth=0.24" Tc=7.1 min UI Adjusted CN=WQ 0.55 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 46HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment DA2B: 3.36/9.01 Runoff = 3.57 cfs @ 12.10 hrs, Volume= 0.279 af, Depth= 0.37" Routed to Pond 3P : CDS Unit Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Type III 24-hr WQ Rainfall=1.21" Area (sf) CN Description 110,080 98 Unconnected pavement, HSG A 35,831 98 Roofs, HSG A 394 98 Water Surface, HSG A 81,217 30 Woods, Good, HSG A 165,043 39 >75% Grass cover, Good, HSG A 392,565 Weighted Average 246,260 62.73% Pervious Area 146,305 37.27% Impervious Area 110,080 75.24% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 50 0.0100 0.96 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.60" 3.5 424 0.0100 2.03 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.7 1,259 0.0300 7.86 6.17 Pipe Channel, CMP_Round 12" 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 7.1 1,733 Total Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 47HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Subcatchment DA2B: 3.36/9.01 Runoff Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Type III 24-hr WQ Rainfall=1.21" Runoff Area=392,565 sf Runoff Volume=0.279 af Runoff Depth=0.37" Flow Length=1,733' Tc=7.1 min CN=WQ 3.57 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 48HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 3P: CDS Unit [57] Hint: Peaked at 8.49' (Flood elevation advised) Inflow Area = 11.114 ac, 34.84% Impervious, Inflow Depth = 0.35" for WQ event Inflow = 4.12 cfs @ 12.10 hrs, Volume= 0.321 af Outflow = 4.12 cfs @ 12.10 hrs, Volume= 0.321 af, Atten= 0%, Lag= 0.0 min Primary = 4.12 cfs @ 12.10 hrs, Volume= 0.321 af Routed to Pond 7P : Constructed Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Peak Elev= 8.49' @ 12.10 hrs Device Routing Invert Outlet Devices #1 Primary 7.50'24.0" Round Culvert L= 36.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 7.50' / 7.00' S= 0.0139 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=4.11 cfs @ 12.10 hrs HW=8.48' TW=7.50' (Fixed TW Elev= 7.50') 1=Culvert (Inlet Controls 4.11 cfs @ 2.67 fps) Pond 3P: CDS Unit Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)4 3 2 1 0 Inflow Area=11.114 ac Peak Elev=8.49' 24.0" Round Culvert n=0.013 L=36.0' S=0.0139 '/' 4.12 cfs4.12 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 49HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 4P: Existing Wetland [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 0.33" for WQ event Inflow = 3.52 cfs @ 12.17 hrs, Volume= 0.361 af Primary = 3.52 cfs @ 12.17 hrs, Volume= 0.361 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Pond 4P: Existing Wetland InflowPrimary Hydrograph Time (hours) 484644424038363432302826242220181614121086420Flow (cfs)3 2 1 0 Inflow Area=13.008 ac 3.52 cfs3.52 cfs Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 50HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Summary for Pond 7P: Constructed Wetland [81] Warning: Exceeded Pond 3P by 0.35' @ 24.40 hrs Inflow Area = 13.008 ac, 31.88% Impervious, Inflow Depth = 0.33" for WQ event Inflow = 4.63 cfs @ 12.10 hrs, Volume= 0.361 af Outflow = 3.52 cfs @ 12.17 hrs, Volume= 0.361 af, Atten= 24%, Lag= 4.4 min Primary = 3.52 cfs @ 12.17 hrs, Volume= 0.361 af Routed to Pond 4P : Existing Wetland Routing by Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.02 hrs Starting Elev= 7.85' Surf.Area= 9,158 sf Storage= 15,149 cf Peak Elev= 8.07' @ 12.17 hrs Surf.Area= 9,536 sf Storage= 17,179 cf (2,029 cf above start) Plug-Flow detention time= 952.0 min calculated for 0.014 af (4% of inflow) Center-of-Mass det. time= 16.3 min ( 799.1 - 782.8 ) Volume Invert Avail.Storage Storage Description #1 3.00' 38,706 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 3.00 304 0 0 4.00 822 563 563 5.00 1,688 1,255 1,818 6.00 3,104 2,396 4,214 7.00 6,142 4,623 8,837 7.35 6,936 2,289 11,126 7.85 9,158 4,024 15,149 8.00 9,416 1,393 16,542 9.00 11,206 10,311 26,853 10.00 12,500 11,853 38,706 Device Routing Invert Outlet Devices #1 Primary 7.85'13.0' long + 3.0 '/' SideZ x 11.2' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.54 2.59 2.70 2.68 2.67 2.68 2.66 2.64 Primary OutFlow Max=3.47 cfs @ 12.17 hrs HW=8.07' TW=7.85' (Fixed TW Elev= 7.85') 1=Broad-Crested Rectangular Weir (Weir Controls 3.47 cfs @ 1.17 fps) Type III 24-hr WQ Rainfall=1.21"22108 CURVE PR_report Printed 9/17/2024Prepared by Horsley Witten Inc Page 51HydroCAD® 10.20-4b s/n 01445 © 2023 HydroCAD Software Solutions LLC Pond 7P: Constructed Wetland Inflow Primary Hydrograph Time (hours)484644424038363432302826242220181614121086420Flow (cfs)5 4 3 2 1 0 Inflow Area=13.008 ac Peak Elev=8.07' Storage=17,179 cf 4.63 cfs 3.52 cfs AREA 11.11 acres CS-6 WEIGHTED C 0.51 110 microns TC 5.00 minutes RAINFALL STATION 66 Rainfall Intensity1 (in/hr) Hydraulic Loading Rate (gpm/ft2) Removal Efficiency (%) Incremental Removal (%) 0.08 7.20 100.0 35.3 0.16 14.39 98.4 23.4 0.24 21.59 91.6 11.8 0.32 28.78 84.8 6.6 0.40 35.98 78.1 3.8 0.48 43.17 71.3 2.5 0.56 50.37 64.6 1.1 0.64 57.56 57.8 1.1 0.72 64.76 51.0 1.0 0.80 71.96 44.3 0.4 1.00 89.94 27.4 0.6 2.00 115.09 2.4 0.1 3.00 115.09 1.6 0.0 87.7 0.0% 98.8% 87.7% 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. Removal Efficiency Adjustment2 = Predicted % Annual Rainfall Treated = Predicted Net Annual Load Removal Efficiency = 1.7% 1.8% 1.9% 0.9% 2.3% 2.9% 0.2% 3.5% CASCADE MODEL PARTICLE SIZE Percent Rainfall Volume1 35.3% 23.8% 12.9% 7.8% 4.9% HDS Estimated Net Annual Solids Load Reduction Based on the Rational Rainfall Method CURVE HILL YARMOUTH, MA APPENDIX C – Soil Test Pit Logs Surface elevation Additional Notes: --M Fi42-75 C CS 10YR 8/1 --M Fi18-42 B MS 10YR 3/6 --M Fr4-18 E MS 10YR 2/1 --M Fr0-4 A MS 10YR 3/2 4. Unsuitable Materials Present:If Yes: 5. Groundwater Observed:63"If Yes:Depth weeping from pit Other Depth Color Percent Gravel Cobbles/Stones Depth standing water in hole Soil Log Depth (in) Soil Horizon/ Layer Soil Texture (USDA) Soil Matrix: Color- Moist (Munsell)Redoximorphic Features Coarse Fragments % by Volume Soil Structure Soil Consistence (Moist) Property Line 10 Drinking Water Well Otherfeetfeet feet 3. Distances From:Open Water Body >200 Drainage Way Wetlands 2. Soil Parent Material:Sandy glaciofluvial deposits Moraines, outwash plains Landform Position on Landscape (SU, SH, BS, FS, TS) >200feetfeet feet (e.g. woodland, agricultural field, vacant lot, etc.)Vegetation Surface Stones (e.g. cobbles, stones, boulders, etc.)Slope (%) Description of Location:South side of Curve Hill Rd in front of #7 11.2 Longitude 1. Land Use:Conservation land Scrub oak and pine No 3-8 70º10'07034"W Commonwealth of Massachusetts City/Town of Yarmouth Form 11 - Soil Suitability Assessment for On-Site Sewage Disposal C. On-Site Review Deep Observation Hole Number:Hole #Date Time Weather Latitude 1 1/4/24 1200P 40F Sun 41º41'08.88"N Yes No Disturbed Soil Fill Material Weathered/Fractured Rock Bedrock Yes No APPENDIX D – Operation and Maintenance Guide Stormwater O&M Guide 1 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA Stormwater Operations & Maintenance Guide Curve Hill Road Stormwater Retrofit Project Table of Contents 1. INTRODUCTION .................................................................................................................... 2 2. RESPONSIBLE PARTIES AND BUDGET ............................................................................ 3 3. GREEN STORMWATER INFRASTRUCTURE .................................................................... 4 3.1. How Does Green Infrastructure Work? ........................................................................................ 4 3.2. What is required for Maintenance? .............................................................................................. 4 3.3. What practices are used at this site? ............................................................................................ 5 4. STRUCTURAL COMPONENTS: CONSTRUCTED WETLAND ........................................ 6 5. PLANTINGS ............................................................................................................................ 8 5.1. Plantings ........................................................................................................................................ 8 6. GENERAL SITE MAINTENANCE ..................................................................................... 17 7. LONG-TERM POLLUTION PREVENTION MEASURES ................................................ 19 APPENDICES A. Maintenance Checklists B. Overall Stormwater Control Measures Locations Plan C. Planting Plan Stormwater O&M Guide 2 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA 1. INTRODUCTION This document provides a general description along with the operation and maintenance requirements for the Curve Hill Road Stormwater Retrofit project, located at Curve Hill Road in Yarmouth, Massachusetts. The responsible parties are required to inspect and maintain all measures as outlined in this maintenance guide throughout the year. Site maintenance is divided into three categories as outlined below. 1. Green Stormwater Infrastructure • Structural Components • Structural Maintenance Schedule • Planting • Landscape Maintenance Schedule • Weed Guide 2. General Site Maintenance • Trash & Debris • Pet Waste • Pavement Sweeping • Contributing Drainage Areas • Snow Removal • De-icing 3. Long-Term Pollution Prevention Measures Stormwater O&M Guide 3 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA 2. RESPONSIBLE PARTIES AND BUDGET The Curve Hill Road site is Town-owned property. The drainage from Great Western Road and Curve Hill Road is Town-owned roads. The Town will provide staff, volunteers as possible, and funding for the long- term O&M at the site. The estimated average annual O&M budget for the proposed system is shown below: • Constructed Wetland: $1,000 ($1,000/Wetland) • Drainage Structures (WQU 100) $500 ($500/structure) Owner contact information is provided below: Owner: Town of Yarmouth Contact: Department of Public Works Amanda Lima, Town Engineer 74 Town Brook Road West Yarmouth, MA 02673 508-398-2231 Contact: Division of Natural Resources Bill Bonnetti 424 Route 28 West Yarmouth, MA 02673 508-760-4800 Owner - Signature: Date: Owner - Signature: Date: Stormwater O&M Guide 4 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA 3. GREEN STORMWATER INFRASTRUCTURE 3.1. How Does Green Infrastructure Work? Green Stormwater Infrastructure (GSI) is a nature-based approach to stormwater treatment and management. These stormwater practices or “treatment areas” are designed to mimic nature and use the natural filtration properties of soil and plants to remove pollutants from stormwater runoff prior to discharging to the municipal drainage system or waterbodies. GSI relies on the following basic steps to function properly. Structural components of the practices facilitate the functioning of the steps. If one of these steps, or components, does not work properly, the entire system can be compromised and the GSI practice itself could be contributing to maintenance problems. This can lead to landscape nuisances, more frequent maintenance, and costly repairs/improvement. The steps are: 1. Collect (Inlets) 2. Move Water (Conveyance) if needed, can come after capturing sediment 3. Capture Sediment (Pretreatment) 4. Treat and Manage (Filter, Infiltrate or Store) 5. Overflow (Spillways) 3.2. What is required for Maintenance? As these are nature-based systems that rely on plant upkeep, the maintenance for GSI typically falls under landscape and general site maintenance services. Proper operation and maintenance (O&M) are vital to its long-term viability. Regularly scheduled maintenance can prevent system failures due to sediment build-up, damage, or deterioration. The maintenance requirements outlined in this guide are critical to ensure proper treatment, maintain storage capacity and preserve the visual integrity. General maintenance includes the following: 1. Removing sediment from the pretreatment practices used to capture sediment. 2. Maintaining the proper drainage function and pollutant removal capacity of the systems. 3. Maintaining healthy native trees, plants, and vegetative cover as well as the removal of unwanted weeds and invasive species. It is recommended that all practices be maintained regularly as part of the routine landscape maintenance or at a minimum four times per year and after major rain events: • Early Spring: during spring cleanup • Summer: during lawn mowing and other routine site maintenance • Early Fall: when leaves begin to fall • Late Fall/Early Winter: after all the leaves have fallen during leaf removal • After major storm events: 2” of rain or greater. Stormwater O&M Guide 5 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA The Town will be able to access the constructed wetland and overflow spillway by a eight-foot wide maintenance access path located along eastern side of the constructed wetland. The Town will use a skid-steer to drive maintenance tools and supplies to the overflow spillway. This maintenance access will need to be maintained regularly (e.g., mowed). The following sections describe the general function and landscape maintenance of each practice on the site. Included in the appendices is a specific Inspection Report for the site (Appendix A) along with a plan showing the location of the items to be inspected and maintained (Appendix B). 3.3. What practices are used at this site? The following practices are present at this site: a. Constructed Wetland: a constructed wetland provides temporary storage in shallow and deep pools that support wetland habitat. Similar to natural wetlands, constructed wetlands use natural processes to treat the stormwater: uptake through vegetation, sedimentation, and biological processes. b. Water Quality Unit: this structure provides the pretreatment prior to the stormwater discharging into the constructed wetland. The maintenance for the green infrastructure is divided into two categories: a. The Structural Components that make up the basic steps of a functioning system. b. The Plantings that are the landscape and filtration element. Each category is further described in the sections below. Stormwater O&M Guide 6 September 2024 Curve Hill Road Stormwater Retrofit Project – Yarmouth, MA 4. STRUCTURAL COMPONENTS: CONSTRUCTED WETLAND Structural Components 1. Collect: Stormwater runoff is directed through a pipe routing to the initial stabilized outfall and wetland cell where stormwater enters the system. 2. Capture Sediment: Sand and debris settle out within the Water Quality Unit and the first wetland cell. 3. Move Water: Stormwater moves from low marsh areas to micropools which provide additional treatment through sedimentation as well as plant uptake. 4. Treat and Manage: Plants in the constructed wetland help to slow the water down and water is treated when it filters through the soil and plant roots. Planted vegetation remove phosphorous and bacteria and allow stormwater to infiltrate into the soil. 5. Overflow: Treated stormwater will discharge over a stabilized stone spillway. 2 4 5 1 3 Stormwater O&M Guide 7 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA MAINTENANCE SCHEDULE: CONSTRUCTED WETLAND A site inspection of the constructed wetland components, including the water quality unit used for pretreatment, shall be conducted at least twice a year in the Spring and Fall, and after major storm events (2” of rain or greater). Debris and trash should be removed monthly (between April and November) and sediment removal should occur during the two site inspections and during the monthly debris and trash inspections as needed. See the calendar below and the Inspection Report in Appendix A for more information. Constructed Wetland and Water Quality Unit General Maintenance Schedule Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Task Frequency & Time of the Year Site Inspection X X Debris & Trash Removal X X X X X X X X Sediment Removal X x x x x x x X should also be completed after major storm events X required inspection x as needed See Plantings section for information on plantings maintenance of the constructed wetland. Use the plantings maintenance calendar to combine maintenance efforts. Stormwater O&M Guide 8 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA 5. PLANTINGS 5.1. Plantings By design, plants in constructed stormwater wetland practices filter stormwater to remove pollutants through uptake, retention, and settling, while providing visual interest and wildlife habitat year-round. These plantings do not require fertilizers, watering, or mowing. The planting design for the site consists of a “no mow” maintenance strategy including wetland edge plantings and wetland plantings. The plantings maintenance checklist is included in Appendix A, and the full planting plan is available in Appendix D. Wetland Edge Wetland Stormwater O&M Guide 9 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: WETLAND AND WETLAND EDGE AREA MAINTENANCE By design, plants in constructed wetlands are meant to flourish throughout the growing season leaving dry standing stalks during the dormant months. Plants do not require fertilizers or watering (except during drought or establishment period). The project area is designated as “no mow” with both Wetland Edge and Wetland Plantings. Remove and replace vegetation as necessary, using the appropriate species as shown on the Planting Plan. The best time to plant is in early to mid-fall or early to mid-spring. Specific maintenance activities include: Seeding and Planting Loam, reseed and plant bare spots with the specified species and seed mix as shown on the Planting Plan. Cutting Back It is not recommended to cut back plantings within the wetland. If cutting is necessary along the wetland edge, cut by hand with shears a maximum of once a year in mid spring. Otherwise, allow areas to grow to their natural heights to maintain a natural wetland appearance. Do NOT cut any wetland edge area lower than 6” – maintain sporadic wooden stakes on site at 6” height to provide visual cues during cutting. Depending on height of grasses and the time of year, grass cuttings/stalks may need to be raked and removed from site so as not to clog the constructed wetland. Use a leaf blower as needed to assist in clean-up. Mowing/Weed Whacking Do not mow or weed whack this area. Pruning Prune trees and shrubs to remove deadwood and low hanging branches. Watering Water only during drought conditions or during seeding/plant establishment period. Fertilizing No fertilizer shall be used. Weeding Weeding should be limited to invasive and weedy species (see section on Weed Identification below and the Weed Guide at https://web.uri.edu/riss/files/In-the-Weeds.pdf). Non-chemical methods (hand pulling and hoeing) are required; chemical herbicides should be avoided. Properly remove and dispose off site all invasive species as to prevent colonization elsewhere; this includes disposal on land beyond the project area. Monitoring During the establishment period, walk the wetland edge monthly to look for invasive and weedy species, bare spots, and to identify potential pest or disease problems. Carefully remove and dispose of all Stormwater O&M Guide 10 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA invasive and weedy species to prevent colonization elsewhere. This includes disposal on land beyond the project area. Observe and map the following on a bi-annual basis, for the first three years, minimum: • The types and distribution of the dominant wetland plants in the constructed wetland • The presence and distribution of planted wetland species • The presence and distribution of invasive wetland species (invasives must be removed) • Indications that other species are replacing the planted wetland species • Percentage of standing water that is unvegetated (excluding the deep water cells which are not suitable for emergent plant growth) • The maximum elevation and the vegetative condition in this zone, • Stability of the original depth zones and the micro-topographic features • Accumulation of sediment in the forebay and micropool; and survival rate of plants (cells with dead plants must be replanted) Debris & Trash Remove and properly dispose of litter from all areas. Stormwater O&M Guide 11 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: REPLACEMENTS Plants in constructed wetlands require varying levels of inundation and filter out pollutants. The plants along the wetland edge need to withstand periods of drought during dry months and water inundation during the wet season and large rain storms. If replacements are needed, use the planting plan as a guide (see Appendix D). However, if a certain species of plants has not done well in the constructed wetland, do not replace with that same species. Rather, replant with one or more of the other species that has thrived under the site conditions at similar depths, or have a wetland bilogist choose a different species based on current photos of the site. Replacement plants selected should be native to the local area to provide additional habitat and pollinator value. The following should be considered when selecting plants for a constructed wetland: • Use native and pollinator-friendly plants. • Adaptable to both drought conditions for short periods of time and water inundation based on the location and water depths within the wetland. • Be salt and wind tolerant • Use a mix of different plant species that will create a resilient plant community including cold & warm season grasses, perennials, emergent aquatic vegetation, and groundcovers in all areas. Stormwater O&M Guide 12 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: MAINTENANCE SCHEDULE By design, plants in the constructed wetland are meant to filter the stormwater as it temporarily stores stormwater to remove pollutants by means of uptake, retention, or settling (Massachusetts Stormwater Handbook). The plantings also flourish throughout the growing season. The plants do not require fertilizers or mulch, and, after establishment, only need water during periods of drought. Remove and replace vegetation as necessary, using the appropriate species as discussed in the section above. Weeding and monitoring for invasive species should occur quarterly during the growing season. An annual spring “clean up” includes pruning as needed. See the calendar below, the Plantings Maintenance Checklist in Appendix A, the Weed Identification section, and the Weed Identification Guide at https://web.uri.edu/riss/files/In-the-Weeds.pdf for more information. https://www.mass.gov/doc/massachusetts-stormwater-handbook-vol-2-ch-2-stormwater-best- management-practices/download Constructed Wetland Annual Landscape Maintenance Schedule Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Task Frequency & Time of the Year Cutting X Weeding X X X X Monitoring X X X X Watering x x x x Seeding x x x x Plant Replacement x x x x X required x as needed Stormwater O&M Guide 13 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: WEED IDENTIFICATION Yellow Toadflax (Linaris vulgaris) Redroot Pigweed- (Amaranthus retroflexus) Smartweed (Polygonum lapathifolium) Dandelion (Taraxacum officinale) Stormwater O&M Guide 14 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: WEED IDENTIFICATION Fireweed (Erechtites hieracifolia) Spotted Spurge (Euphorbia maculata) Crabgrass (Digitaria ischaemum) Crabgrass with seedheads Ragweed (Ambrosia artemisiifolia) Japanese Knotweed (Polygonum cuspidatum) Stormwater O&M Guide 15 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: WEED IDENTIFICATION Ragweed (Ambrosia artemisiifolia) Oriental Bittersweet (Celastrus orbiculatus) Green Foxtail (Setaria viridis) Norway Maple Tree Seedling (Acer platanoides) Stormwater O&M Guide 16 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA PLANTINGS: WEED IDENTIFICATION Catalpa Tree Seedling (Catalpa speciosa) Purple Loosestrife (Lythrum salicaria) Field Bindweed (Convolvulus arvensis) Black Swallow-wort (Cynanchum louisea) Stormwater O&M Guide 17 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA 6. GENERAL SITE MAINTENANCE General site maintenance includes the following requirements: Trash & Debris Remove and properly dispose of all trash and debris. Pet Waste Visitors to the site are encouraged to pick up after their pets. Remove and properly dispose of all pet waste left behind. Pet waste should be picked up and disposed of properly to reduce bacteria and nutrient levels in stormwater. Pavement Sweeping Paved roadways should be mechanically swept, at a minimum of once per year in early spring, to remove accumulated sand and sediment debris. Snow Removal Due to the potential for plant damage, snow piling and or removal is NOT recommended in the constructed wetland area. De-Icing When de-icing compounds are necessary for areas draining to the green stormwater infrastructure, the least harmful chemicals should be used. Excessive salting should be avoided. Use of large amounts of sand should also be avoided, since it may obstruct the conveyance system. Mosquito Management Mosquitoes are common in natural wetlands and can be expected in constructed wetlands. Immediately after construction has completed, prior to emergence and maturation of vegetative communities, it is difficult to forecast the degree to which nuisance insects will be an issue. The best approach to avoiding mosquito problems in constructed wetlands is to eliminate areas of open, stagnant water. Flowing water, shaded water, and vegetated areas discourage mosquito larval growth. Removing sticks, branches, or fallen vegetation that inhibits free hydrological movement between deep pools or that block the outlet snout will help keep water freely flowing throughout the system. Other insect larvae that naturally occur in wetlands, such as those of dragonflies, prey on mosquito larvae. Tree swallows and bats can eat thousands of adult mosquitoes every day. Adding bird or bat habitats can reduce the numbers of adult mosquitoes significantly. The Pumpkinseed (Lepomis gibbosus) is a small sunfish, native to Massachusetts, that feeds primarily on insects, also feeding on crustaceans, very small fish, and aquatic vegetation. If these strategies fail to adequately curb the nuisance of mosquito populations breeding in the constructed wetland, insecticides, oils, or bacterial agents can be used, although the effects on the wetland and downstream ecosystems are not well understood, and these methods should be used only Stormwater O&M Guide 18 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA as a last resort. Bacillus thuringiensis isroelensis (Bti) is a group of bacteria that can be used as a biological control agent, killing the larvae of various species of mosquito, gnat, and black fly. Stormwater O&M Guide 19 September 2024 Curve Hill Road Stormwater Retrofit Project Yarmouth, MA 7. LONG-TERM POLLUTION PREVENTION MEASURES Long-term pollution prevention measures implemented at the site reduce pollutants in stormwater discharges. The following precautions will be employed on an on-going basis. Spill Prevention & Control Measures To minimize the risk of spills or other accidental exposure of materials and substances to stormwater runoff, the following material management is to be used when working on site. • Any materials stored on-site will be stored in a neat, orderly manner in their appropriate containers. • Products will be kept in their original containers with the original manufacturer’s label. • Substances will not be mixed with one another unless recommended by the manufacturer. • Manufacturers’ recommendations for proper use and disposal will be followed. • The contractor’s supervisor will be issued this Guide to ensure proper use and disposal of materials. Materials or substances listed below may be present on-site for maintenance and care should be taken to avoid spills: o Petroleum Based Products The following product-specific measures will be followed on-site: • Petroleum Products - All on-site vehicles will be monitored for leaks and receive preventative maintenance to reduce the chance of leakage. • Grass Clipping, Leaf Litter and Plant Debris – are to be removed from the property and not disposed on site. APPENDIX A – Maintenance Checklists • Constructed Wetland Operation and Maintenance Checklist Curve Hill Road Stormwater Retrofit Project 1 Date: Time: Inspector: *Sediment shall be disposed of offsite in a pre-approved location. Maintenance Item Description Maintenance (Y/N) 1. COLLECT Includes: Pipe Inlet Area, Drop Inlet Frequency: Inspect four times per years during regular park maintenance and after major storm events (2” of rain or greater) When: March, June, September, November Surface Debris Cleaning Remove all trash, leaf litter and inlet clogging. Inlets Check for clogging and sediment accumulation that impacts inflow. If sediment/debris accumulation is observed, remove and dispose. Actions to be taken: 2. CAPTURE Includes: Water Quality Unit Frequency: Inspect four times per year and after major storm events the first year; then annually and after major storm events (2” of rain or greater) When: March, June, September, November Debris Cleanout Remove all trash and debris. Side Slopes Signs of erosion gullies, animal burrowing, overtopping, or slumping are observed. Repair, as necessary. Sediment/Organic Debris Removal Remove sediment accumulation and properly dispose when accumulation is greater than or equal to 3 inches or you cannot see stones.* Actions to be taken: 3 & 4. MOVE & FILTER Includes: Low Marsh with Permanent pools and Micropools Frequency: Inspect four times per year during regular park maintenance and after major storm events (2” of rain or greater) When: March, June, September, November Operation and Maintenance Checklist Curve Hill Road Stormwater Retrofit Project 2 Maintenance Item Description Maintenance (Y/N) Debris Cleanout Remove trash and debris from the wetland. Remove any fallen branches that prevent free hydraulic movement between the micropools. Sediment/Organic Debris Removal Remove and properly dispose of when build-up is greater than or equal to 3 inches.* Erosion Check for areas of erosion/ gullies, particularly along the steep slopes. Repair/reseed as necessary Vegetation Maintenance Replacement See Landscape Maintenance Actions to be taken: 5. OVERFLOW Includes: Overflow Spillway Frequency: Inspect bi-annually and after major storm events (2” of rain or greater) When: March and September Overflow Spillways Water level should be at the concrete curb of the spillway. Check for sediment accumulation that impacts outflow. Check for leaf litter, debris, and inlet clogging. If sediment, litter or debris has accumulated, schedule cleaning. Actions to be taken: Other Routine Grounds Maintenance Includes: Surrounding landscape beyond the practice. Frequency: Inspect four times per year during regular park maintenance and after major storm events When: March, June, September, November Debris Removal Remove trash from perimeter areas. Contributing drainage area Look for sediment sources from erosion in the surrounding area. Drainage Network Ensure proper operation. Path Repairs Check path for ponding and other obstructions. Repair paths as needed to ensure positive drainage. Remove obstructions as needed. Pavement Sweeping Sweep the access road and parking lot once a year after spring thaw. Actions to be taken: Operation and Maintenance Checklist Curve Hill Road Stormwater Retrofit Project 3 Maintenance Item Description Maintenance (Y/N) Plantings Maintenance Checklist Curve Hill Road Stormwater Retrofit Project 1 Location: Date: Inspector: Task Description Complete (Y/N) Cutting • Cut with shears as desired once a year in the early spring. • Do not cut lower than 6”. • Blow out leaves and cuttings for easy removal. • Remove cuttings. Weeding • Weeding should be limited to invasive and exotic species, which can overwhelm the desired plant community.* • Non-chemical methods including hand pulling and hoeing are recommended. • Chemical herbicides are not allowed. Monitoring • Look for potential invasive species and identify potential disease. Remove and dispose of all invasive species.* (see weeding) Watering • During establishment or drought conditions, plants should be watered a minimum of once every seven to ten days. Seeding • Loam and re-seed bare spots with the specified seed mix as shown on the Planting Plan. Plant Replacement • Replace/replant diseases, unhealthy or dead plans to maintain a healthy plant community Fertilizing NONE Mulch NONE Debris Removal • Remove trash from perimeter areas. Actions to be taken: *Invasive species shall be disposed of offsite in a pre-approved location. Wetland Wetland Edge All areas (Wetland and Wetland Edge) APPENDIX B – Overall SCM Locations APPENDIX C – Planting Plan APPENDIX E – Pollutant Controls During Construction Pollutant Controls During Construction 1 August 2024 Curve Hilld Road Stormwater Retrofit Project – Yarmouth, MA POLLUTANT CONTROLS DURING CONSTRUCTION 1.1 Structural Practices The following are the structural practices that will be implemented as part of the construction activity. • Sediment Silt Sock Barrier will be installed prior to commencement of construction. The silt sock will be used on the downgradient portions of the limit of work to allow water to flow through it while keeping sediment on site. The Town will be informed upon their installation so that they may inspect these barriers prior to construction. Portions of these barriers will be replaced and/or repaired as necessary. Barriers will be installed parallel to land slope at the perimeter of the work site, as shown on the Plans. Details are provided in the Plans. • Silt Sacks (or approved equivalent) will be installed at catch basins and following construction of the proposed overflow structures to prevent sedimentation during construction. The silt sack will be emptied/replaced and disposed of off-site if damage is observed. • Sediment Traps/Basins. The water quality unit, catch basin, and inlet pipe into the constructed wetland will be installed first, so that sediment from the roadways is captured by the water quality unit before discharging onto the site. The constructed wetland will be dewatered during construction activities from . Heavy equipment will not be allowed to operate on the surface location where the system is planned because soil compaction can adversely impact the long- term performance. Light earth-moving equipment will be used for excavation and construction of the system. All excavated materials from the area will be removed and disposed of in an approved location. • Construction Entrance will be installed. All construction vehicles must use this access point to ensure sediment is not tracked off site. • Slope Stabilization will occur immediately upon obtaining final grades as shown on the project site plans. Areas that fail to stabilize will be re-graded to final grade and stabilized as necessary. The amount of land disturbed will be minimized to reduce potential for erosion and sedimentation. Stabilization measures shall be initiated within 14 days following the end of construction at each portion of the site and as soon as practicable. The entire stormwater management system including pipes, structures, and constructed wetland, will be inspected upon completion of construction. Sediment will be removed from all elements of the stormwater management system. All control measures must be installed and maintained in accordance with manufacturer’s specifications, good engineering practices, and in accordance with this report (every seven calendar days and after storm events). If inspections show that a control has failed or been installed incorrectly, the Operator must replace or modify it within 24 hours. Pollutant Controls During Construction 2 August 2024 Curve Hilld Road Stormwater Retrofit Project – Yarmouth, MA 1.2 Stabilization Practices The amount of land disturbed during construction will be minimized to reduce the potential for erosion and sedimentation. Prompt surface stabilization will be provided to control erosion in areas where disturbances cannot be avoided during construction. Stabilization measures shall be initiated within 14 days following the end of construction at each portion of the site. Exceptions to this requirement are allowable when snow cover prevents the initiation of stabilization within 14 days, in which case such measures shall be undertaken as soon as possible. Stabilization measures that will be, or may be, used during construction are described below: • Temporary Seeding – Temporary seeding of disturbed surfaces with fast-growing grasses (annual rye) to provide greater resistance to stormwater runoff and/or wind erosion for areas where construction has temporarily ceased. • Permanent Seeding – Permanent seeding of surfaces with vegetation, including but not limited to grass, trees, bushes, and shrubs, to stabilize the soil. Establishing a permanent and sustainable ground cover at a site stabilizes the soil while reducing the sediment content in runoff. • Permanent Planting –establish all planting as required at the completion of the project. • Erosion Control Blankets - install erosion control blankets along all slopes greater than 3:1. • Mulching – materials, including but not limited to hay, grass, woodchips, straw, and gravel will be placed on the soil surface to cover and hold in place disturbed soils. Temporary seeding or other soil stabilization measures will be provided where construction activities have ceased at the site. Topsoil stockpiles will be temporarily seeded or covered to prevent erosion and will be surrounded with silt fence or silt sock. When the site’s final grade has been established, permanent vegetation will be planted on the disturbed areas. The vegetation will consist of grass, shrubs, bushes, and trees in the locations indicated on the plans. 1.3 Other Types of Controls Additional controls/practices will be undertaken to reduce pollution in stormwater runoff flows which include, but are not limited to, control of off-site mud tracking from construction site, dust suppression, proper sanitary waste disposal, earthwork procedures timed and conducted in manners aimed to minimize erosion and sedimentation, snow removal plans, proper management of waste materials, proper management of hazardous waste, proper material stockpiling, and spill prevention and control measures. • Dust Suppression – Water sprays shall be used to control dust during extended dry periods during construction. Pollutant Controls During Construction 3 August 2024 Curve Hilld Road Stormwater Retrofit Project – Yarmouth, MA • Earthwork – The exposure of disturbed surfaces to stormwater and potential stormwater erosion will be minimized by well-organized earthwork procedures. Stabilization procedures shall be undertaken in accordance with this report. Grubbing during wet seasons will be avoided if feasible. • Snow Removal Plan – Plowed snow collected from the roadway and parking areas will be deposited onto free draining, pervious surfaces, away from the sites drainage conveyance structures to maximize infiltration. • Waste Materials – Dumpsters rented from a licensed solid waste management company will be used to store solid waste and debris that cannot be recycled, reused or salvaged. The dumpsters will meet all local and state solid waste management regulations. Dumpsters will be covered when refuse is not being directly deposited or withdrawn from them. Potentially hazardous wastes will be separated from normal wastes, including segregation of storage areas and proper labeling of containers. Removal of all waste from the site will be performed by licensed contractors in accordance with applicable regulatory requirements and disposed of at either local or regional approved facilities. Waste materials will not be buried on-site. All site personnel will be instructed regarding the correct procedures for waste disposal. Notices stating these procedures will be posted at the site. Solvents and flushing materials used during construction and pre-operational cleaning will be provided, handled, managed, and removed by the contractor for appropriate off-site disposal. • Hazardous Waste Materials – Any disposal of hazardous materials will be completed using the required paperwork. Copies will be provided to the Engineer and to the city. • Spill Prevention and Control Measures – To minimize the risk of spills or other accidental exposure of materials and substances to stormwater runoff, the following material management practices will be used throughout the project: o An effort will be made to store only enough products required to do the job. o All materials stored on-site will be stored in a neat, orderly manner in their appropriate containers and, if possible, under a roof or other enclosure. o Products will be kept in their original containers with the original manufacturer’s label. o Substances will not be mixed with one another unless recommended by the manufacturer. o Whenever possible, the maximum amount of a product will be used before disposing of the container. o Manufacturers’ recommendations for proper use and disposal will be followed. Pollutant Controls During Construction 4 August 2024 Curve Hilld Road Stormwater Retrofit Project – Yarmouth, MA o The site superintendent will conduct daily inspections to ensure proper use and disposal of materials. To reduce the risk associated with hazardous materials used on the site, the following practices will be used: − Products will be kept in original containers unless they are not resealable. − Original labels and material safety data sheets will be retained and kept on-site; they contain important product information. − If surplus product must be disposed of, manufacturers’ or local and state recommended methods for proper disposal will be followed. • Materials List - Materials or substances listed below are expected to be present on-site during construction: - Concrete - Fertilizers - Asphalt - Petroleum Based Products - Paints (enamel and latex) - Cleaning Solvents - Metal Studs - Wood - Concrete - Tar - Sealants - Adhesives The following product-specific practices will be followed on-site: Petroleum Products - All on-site vehicles will be monitored for leaks and receive preventative maintenance to reduce the chance of leakage. Petroleum products will be stored in tightly sealed containers which area clearly labeled. Any asphalt substances used on-site will be applied according to the manufacturers’ recommendations. Paints – All containers will be tightly sealed and stored indoors when not required for use. Excess paint will not be discharged to the storm sewer system but will be properly disposed of according to the manufacturers’ instructions or state and local regulations. Concrete Trucks – Concrete trucks will not be allowed to wash out or discharge surplus concrete or drum wash water on the site. In addition to the good housekeeping and material management practices discussed in the previous sections of this plan, the following practices will be followed for spill prevention and cleanup: Pollutant Controls During Construction 5 August 2024 Curve Hilld Road Stormwater Retrofit Project – Yarmouth, MA • Manufacturers’ recommended methods for spill cleanup will be clearly posted, and site personnel will be made aware of the procedures and location of the information and cleanup supplies. • Materials and equipment necessary for spill cleanup will be kept in the material storage area on- site. Equipment and materials will include, but not be limited to, brooms, dust pans, mops, rags, gloves, goggles, speedi-dry, sand, sawdust, and plastic and metal trash containers specifically for this purpose. • All spills will be cleaned up immediately after discovery. Spills large enough to reach the storm water system will be reported to the National Response Center at 1-800-424-8802. • The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with a hazardous substance. • Spills of toxic or hazardous material will be reported to the appropriate state or local government agency, regardless of the size. • The site superintendent responsible for the day-to-day site operations will be the spill prevention and clean-up coordinator. He will designate at least three other site personnel who will receive spill prevention and cleanup training. These individuals will each become responsible for a particular phase of prevention and cleanup. The names of responsible spill personnel will be posted in the material storage area and in the on-site office trailer. APPENDIX F – Site Plans