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HomeMy WebLinkAboutSWPPP and O&M 3.18.2026 Section 4 Long-Term Pollution Prevention And Operation & Maintenance Plan Operation & Maintenance Plan 1 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA LONG-TERM STORMWATER POLLUTION PREVENTION PLAN and OPERATION & MAINTENANCE (O&M) PLAN FOR RAW LAND CELL TOWER PROJECT OVERVIEW Blue Sky Towers III, LLC (“Applicant”) proposes to construct an unmanned wireless telecommunications facility within a 100’x100’ [10,000 square foot (SF)] lease area in the central portion of the property designated as Assessor’s Parcel 50-189.1 located off Route 28 in South Yarmouth, Massachusetts. The project proposes to install a new gravel driveway/parking area from the existing paved parking lot associated with the Our Lady of the Highway Catholic Parish. The facility itself will be constructed of a 55’x60’ (3,300 SF) fenced-in compound surfaced with clean 3/4” stone over filter fabric. A galvanized steel monopole tower supporting antenna equipment will be placed on a reinforced concrete foundation below grade. Ground and tower space will be allotted for up to three carriers. A common utility area will be located at the south side of the compound. The project also includes the addition of stormwater facilities for runoff treatment tributary to the proposed tower compound and driveway/parking improvements. The project seeks to avoid drainage impacts to surrounding resources by directing non-point source sheet flow runoff through existing vegetated areas that promotes sediment removal through filtering, absorption, and settling as the velocity of flow and resultant energy is reduced. Structural Best Management Practices (BMPs) near the tower compound and along the gravel driveway/parking area include pea gravel diaphragms, vegetated swales, and an infiltration basin with sediment forebay pretreatment. The project will require disturbance of ~12,200 square feet of land. The proposed site improvements are shown on the plans provided under separate cover entitled “South Yarmouth; MA-5104; 1044 Route 28; South Yarmouth, MA 02664” latest revision as prepared by ProTerra Design Group, LLC. OWNER AND RESPONSIBLE PARTY Landlord (Lessor/Property Owner): N/F Roman Catholic Bishop of Fall River c/o St. Pius X P.O. Box 2577 Fall River, MA 02722 Telecommunication Facility Lessee & Responsible Party: Blue Sky Towers III, LLC 352 Park Street Suite 106 North Reading, MA 01864 The Responsible Party has obtained ground and access leases from the Owner which allows for maintenance of the stormwater system and the associated telecommunications equipment. Operation & Maintenance Plan 2 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA CONSTRUCTION MANAGEMENT Contractor: ________________________ Address: __________________________ _________________________________ Phone Number: ____________________ A construction manager with adequate knowledge and experience on projects of similar size and scope shall be employed to oversee all site work related construction. The contractor shall incorporate appropriate techniques to control sediment and erosion pollution during construction in accordance with the Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas. Dewatering activities (if required) shall be directed towards a berm and filter sack to promote infiltration into the ground. EROSION CONTROL BEST MANAGEMENT PRACTICES (BMPs) During construction, silt-laden runoff or discharge from dewatering operations (if necessary) will be prevented from exiting the construction area untreated. Siltation barriers consisting of a filter fabric silt fence, wood chip berms, straw bales or silt socks will be erected in advance of construction along the down-gradient edge of all disturbed areas and maintained throughout the construction period. The control of dust and erosion during the construction period will be managed using a number of Best Management Practices (BMPs) described below and as shown on the Erosion Control Plan & Details sheet (EC-1) of the Construction Drawings. Stabilized Construction Entrance An apron constructed of coarse aggregate over a geotextile fabric shall cover the transition between the existing parking lot and the proposed driveway/parking area. The size and construction of the entrance is shown on the EC-1 sheet. This entrance shall be inspected daily and maintained throughout construction activities and optionally removed after completion. Temporary Sediment Traps (During Construction) Small depressions that have stormwater runoff directed into them for increase retention time that promotes settling out of suspended solids. Tributary drainage area shall be under 1 acre. The storage volumes should be 1,800 cubic feet per acre of tributary area. The infiltration basin near the tower compound may not be utilized during construction as a temporary sediment trap. Silt Fence, Reinforced with Straw Bales as Required (Compost Berms & Socks can be used as alternatives) Silt fence or silt sock is installed at the down gradient limit of work. It should be trenched into the ground 6” and staked without drooping. The woven fabric will allow the passage of stormwater while filtering out suspended solids. Straw bales give added filtering and erosion control. Every 100’ two bales or silt socks shall be placed and staked perpendicular to the fence. Straw bales shall be inert straw or salt hay type. Operation & Maintenance Plan 3 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA Chipping Trees & Slash Debris (wood chip berms) Residual materials made available from tree and brush clearing and grubbing the site shall be used to intercept and retain sediment from the disturbed areas. A temporary sediment barrier constructed of wood chips may be installed along the perimeter of the disturbed areas. These barriers are stable and composed of natural materials reused on-site requiring small amounts of maintenance. At the completion of construction, the shredded or chipped wood shall be spread as ground cover to provide stabilization over the disturbed areas. Dewatering Although groundwater is not anticipated, if dewatering is required, discharges shall be directed through a settling pool or filter bag prior to discharge and infiltration into the ground. Outflow of silt-laden runoff shall not be permitted to flow directly into resource areas. Upon completion of site stabilization, the BMP’s and conveyance systems shall be thoroughly cleaned of silt and sediment and made ready for the proposed operation. Discharge points shall be set back from the edge of the resource areas and monitored by qualified personnel to ensure no impacts to resource areas and compliance with applicable federal and state regulations. Discharges shall be free from visible floating, suspended, and settleable solids that would impair the functions of the wetlands and downstream river. Concrete Washout Pit A concrete washout pit/area must be designated to receive wash water from washing of tools and concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch mixers, or pump trucks. Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner. ON-GOING MAINTENANCE CONTRACT The Responsible Party shall hire appropriate staff, contract with a maintenance company, or designate a qualified party to complete ongoing maintenance for the tower compound, access drive/parking area, and stormwater features for the facility. LIVING DOCUMENT PROVISIONS This document shall be updated as necessary to reflect new procedures, technologies or requirements over the life span of the facility. Ultimately, the Responsible Party will have the authority to implement a plan and frequency of maintenance as required. MAINTENANCE LOG The Responsible Party shall develop and maintain a log of inspections, maintenance, repairs, and disposal (including location of disposal) during the life of the project. Records shall be maintained for at least three years and be made available to regulatory agencies in accordance with the provisions of the Massachusetts Stormwater Handbook. A sample of such a maintenance log is provided. Operation & Maintenance Plan 4 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA GOOD HOUSEKEEPING PRACTICES DURING CONSTRUCTION The Responsible Party shall maintain good housekeeping practices by maintaining a clean and orderly facility to prevent potential pollution sources from coming into contact with stormwater and degrading water quality. This includes establishing protocols to reduce the possibility of mishandling materials or equipment and training employees in good housekeeping techniques. Common areas where good housekeeping practices should be followed shall include: material storage areas, vehicle and equipment maintenance areas, and loading areas. Good housekeeping practices must include a designated and secure location for garbage. A schedule for regular pickup and disposal of garbage and waste materials during construction and routine inspections of containers for leaks and structural integrity shall be developed. After construction, no trash shall be kept on-site and shall be removed by service technicians or contractors when they leave. Portable toilets shall be installed on site and maintained throughout construction. Excess concrete and cleanout water from redi-mix vehicles shall be directed towards small excavations or constructed boxes for cleanup. Drainage conveyance systems shall not be used for this purpose. MINIMIZING EXPOSURE The Responsible Party shall minimize exposure of potential pollutant sources from coming into contact with precipitation and being picked up by stormwater and carried into drains and surface waters. All materials shall be plainly labeled and stored in an appropriate container in an appropriate location. All activities which can generate sources of contaminants shall be contained. Operation & Maintenance Plan 5 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA LONG-TERM DRIVEWAY/PARKING AREA & BMP: MAINTENANCE The gravel driveway/parking area must be maintained during active use, after construction operations have been completed, and after major storm events to ensure that the drainage structures are functioning properly. Prior to final completion and full occupancy of the telecommunications facility, a representative of the Contractor and/or Engineer shall properly instruct the user of the required maintenance responsibilities to maintain the effectiveness of the driveway and drainage system. The Responsible Party will implement the procedures and frequencies under their current plan and inspect the systems as needed to maintain maximum effectiveness. Gravel Driveway / Parking Area During the construction of the gravel driveway/parking area, the contractor shall verify the subgrade provides adequate strength to support the gravel base and gravel top layers. If weak or soft spots are encountered during construction, an AASHTO Class III geotextile reinforcement or angular stone layer shall be installed along the subgrade prior to placing any structural fill or gravel base. Groundwater can affect the strength of the driveway subbase. In areas of cut, subdrains shall be installed and outletted to daylight to facilitate the removal of groundwater interaction with the driveway section. After the completion of construction, maintenance items that should be performed routinely include:  Grading and shaping the driveway surface to maintain a distinct in-sloped, out-sloped, or crown shape to move water rapidly off the road surface o Do not leave a berm on the side of the driveway that could channel stormwater down the driveway  Compacting the graded driveway surface to keep a hard driving surface and prevent the loss of fines. Replace surfacing material when needed  Removing ruts through rolling dips and water bars  Replacing and/or repairing rock armor or vegetation used for slope protection, scour protection, or energy dissipation  Trimming roadside vegetation adequately, but not excessively, for sight distance and traffic safety  Cleaning sediment and debris accumulation within drainage culverts  Check for slide debris and remove as needed  If snow plowing occurs, grading and shaping of the driveway surface shall be returned to the original plan design to maintain design drainage patterns toward the stormwater BMPs  Refer to “Matrix of Road Surface BMP’s For Maintenance Work” Operation & Maintenance Plan 6 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA Operation & Maintenance Plan 7 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA Vegetated Swales During the construction phases of the project, the vegetated swales shall be inspected monthly and cleaned as necessary and/or after storms events with 1” of rainfall or greater. Thereafter, this structure shall be inspected every six months during the responsible party’s regular maintenance of the grounds. Cleanings shall include:  Regularly (2-3 times a year) mowing the grass (4-6” height)  Cleaning sediment buildup, and reseeding bare spots  Removal of large vegetation and trash  Check for signs of rilling/gullying and repair with soil and vegetation as needed.  Refer to “Matrix of Ditch BMP’s for Maintenance” Operation & Maintenance Plan 8 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA Forested Vegetated Filter Strips The forested vegetated filter strips shall be inspected monthly to monitor the vegetation growth and as necessary after storm events with 1” of rainfall or greater during the construction phases of the project. Thereafter, the forested vegetated filter strips shall be inspected at least once per year as needed during the responsible party’s regular maintenance of the site. Cleanings shall include:  Cleaning sediment buildup  Verify sediment is not leaving the site. Pea Gravel Diaphragms During the construction phases of the project, the pea gravel diaphragms shall be inspected monthly and cleaned as necessary and/or after storm events with 1” of rainfall or greater. Thereafter, these structures shall be cleaned at least once per year or as needed during the Applicant’s regular maintenance of the site. Cleanings shall include:  Removal of vegetation  Removal of excess sediment accumulation  Inspection of condition of stone. Sediment Forebay During the construction phases of the project, the sediment forebay shall be inspected monthly and cleaned as necessary and/or after storms events with 1” of rainfall or greater. Thereafter, this structure shall be inspected at least quarterly per year and cleaned as necessary or as needed during the owner’s regular maintenance of the grounds. A fixed vertical sediment marker shall be installed to measure the depth of accumulated sediment. Cleanings shall include:  Mowing the perimeter berm  Removal of large vegetation and trash  Removal of excess sediment accumulation  Cleaning of outlet weir  Check for signs of rilling/gullying and repair with soil and vegetation as needed Infiltration Basin During the construction phases of the project, the basin shall be inspected monthly and cleaned as necessary and/or after storm events with 1” of rainfall or greater. Once the system goes online, inspections shall occur after each storm event for the first three months, as required, to ensure proper stabilization, function, and to ensure that the inlets and outlets remain free of obstructions. Thereafter, these structures shall be inspected and cleaned as necessary at least twice per year. Maintenance and snow removal crews shall be informed to not push snow directly into the infiltration basin. Operation & Maintenance Plan 9 South Yarmouth (MA-5104) Blue Sky Towers III, LLC South Yarmouth, MA Cleanings shall include:  Removal of accumulated sediment  Inspection of the infiltration structure  Monitoring of groundwater to ensure proper operation of the system  Important items to check for include: o Differential settlement o Cracking, erosion, embankment breakout o Tree growth on the embankments o Health of turf o Clogging of outlets o Root infestation o Water levels should be checked and recorded against rainfall amounts to verify that the drainage system is working properly. ESTIMATED ANNUAL INSEPCTION, OPERATION, AND MAINTENANCE BUDGET BMP Frequency Unit Cost Subtotal Vegetated Swales 2 visits per year $300 $600 Forested Vegetated Filter Strips 1 visit per year $300 $300 Pea Gravel Diaphragms 1 visit per year $300 $300 Sediment Forebay 4 visits per year $350 $1400 Infiltration Basin 2 visits per year $350 $700 Total: $3300 The annual maintenance cost does not include the owner’s regular maintenance of the grounds that would consist of mowing & debris pickup. Stormwater BMP Inspection and Maintenance Log Project Name: South Yarmouth (MA-5104); 1044 Route 28; South Yarmouth, MA 02664 SWPPP Contact: Blue Sky Towers III, LLC Contact: ________________________ Phone: ________________________ Begin Date End Date Date BMP ID# BMP Description Inspected by: Cause for Inspection Exceptions Noted Comments and Actions Taken LONG TERM STRUCTURAL BEST MANAGEMENT PRACTICE INSPECTION & MAINTENANCE MATRIX AFTER CONSTRUCTION Note: BMP's shall be visually inspected and repaired by a qualified party in accordance with the following chart. Note these are minimum inspection criteria/frequencies and should be adjusted throughout the project lifespan as required to maintain effectiveness. Refer to maintenance standards for drainage facilities and structural best management practices in the "Recommended Long-Term Stormwater Pollution Prevention Plan."Conventional & LID Best Management PracticesRecommended Minimum Inspection & Maintenance FrequencyErosion/ScouringTree Growth HazardsDifferential Settlement/SeepageStructural Damage/ObstructionsTrash & DebrisRemoval of Accumulated SedimentSlope Integrity*Mow Vegetation/Poor Vegetation CoverageRemove/Reset Filter Fabric & Stone As RequiredCheck - Remove & Replace mulch/media/stoneRemove/Reset Riprap as RequiredForested Vegetated Filter Strip Annually        Infiltration Basin Semi-Annually          Sediment Forebay Quarterly         Pea Gravel Diaphragm Annually       Vegetated Swale Semi-Annual      