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HomeMy WebLinkAboutConstruction PPP revisedCONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 1 EROSION AND SEDMENTATION CONTROL PLAN- CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN (CPPPP) Revised 10/22/2024 Introduction As required by Standards 4 and 9 of the Stormwater Management Handbook and Section 2.06 of the Town of Yarmouth Stormwater Management Regulations, this Construction Period Pollution Prevention Plan has been developed for source control and pollution prevention at the site during construction. This project does not appear to require coverage under the National Pollutant Discharge Elimination System (NPDES) Construction General Permit (CGP). No stormwater discharges from construction activity are planned to enter into the Waters of the United States. An area that will remain undisturbed is tributary to a wetland located offsite to the north. An NPDES Stormwater Pollution Prevention Plan will be substituted for this Plan after review and permitting, if CGP coverage is required and the final project area still exceeds 1 acre. Storm events during construction represent the largest threat to pollution of natural areas. It is the contractor's responsibility to monitor local weather reports during construction and prior to scheduling earthmoving or other construction activities which will leave large disturbed areas un-stabilized. The following general controls will be implemented during construction. These controls are shown on the Erosion Control Plans. Perimeter Controls Silt fence or compost filter tubes will be used to prevent the migration of soil and silt from the work site. The erosion controls will define the limit of work in areas where they are installed and no construction activities will occur downgradient of the installed perimeter erosion controls. The locations of the perimeter erosion controls shall be verified by the engineer and/or local Town agent, if necessary. In no case is the limit of work to extend beyond the sedimentation barriers/ limit of disturbance as shown on the project plans. The contactor, or other designated employee, shall be responsible for the daily inspection and maintenance of all the perimeter controls and shall implement all necessary measures to repair CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 2 and maintain this line. Erosion and sedimentation controls shall be visually inspected after every storm event. Close inspection will be made for undercutting beneath the controls. Sediment shall be collected and disposed of in a pre-approved location by the contractor as directed by the engineer. Perimeter controls shall be replaced as necessary. Vegetated buffer strips will be maintained beyond the limits of the project area to act as living sediment filters that intercept and detain stormwater runoff. Vegetation will be left wherever practicable during construction. If conditions or time of year do not allow final revegetation, wood chips or mulch shall be used to stabilize disturbed slopes. Any temporary placed mulch or wood chips will be removed and the ground surface re-seeded at the beginning of the following growing season. Soil stabilization measures including seeding will be initiated as soon as practicable on portions of the site where construction activities have temporarily or permanently ceased, but in no case more than 30 days after the construction activity has ceased. These measures may include mulching, hydroseeding, erosion control blankets, and soil roughening. Existing or proposed slopes exceeding 2H:1V shall have erosion control matting installed to stabilize the disturbed slopes during construction. In certain circumstances additional or enhanced perimeter erosion controls may be required to adequately protect the environment. This may involve installation of additional silt fence, straw bales, and/or temporary berms with stilling ponds. Soil erosion and sedimentation control measures shall be inspected either on weekly basis or every 14 days and after each rainfall event of 0.25 inches or greater during construction. Weekly inspections are recommended. Stockpiled Sediment or Soil and Staging Areas Soil may need to be stockpiled temporarily during construction. Stockpile areas will not interfere with construction equipment and will be located away from any areas of concentrated flow or pavement. The slopes of the stockpiles shall be roughened by equipment tracking and shall not exceed 2H:1V to prevent erosion. The stockpile area shall be encircled with perimeter erosion controls (compost filter tubes or straw bales, or a combination thereof). A minimum surplus of 25-feet of erosion control barrier shall be stored on site at all times. Construction Vehicle Traffic CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 3 The construction site will be accessed from Woburn Street, and the existing entrances will be maintained during construction until the new driveways are established. A stabilized pad of stone will be installed at each entrance used for access to remove debris from tires as vehicles leave the work area. The construction entrance shall be inspected weekly and within 24-hours of a storm event that produces 0.25 inches of rain or more during a 24-hour period. A minimum 6-inch thick pad shall be maintained and top-dressed with washed trap rock as needed to prevent tracking or flow of sediments onto public roads. Any sediment tracked out from the work area shall be removed by sweeping, shoveling, vacuuming, or other effective methods at the end of each working day. Tracked out sediments will not be hosed into any stormwater conveyances, storm drain inlets, or waterbody/ resource areas, as it is prohibited. Trucks delivering or removing soils, materials, and/or equipment to and from the site must be cleaned of any excess soil prior to leaving the site to ensure that no significant amount of sediment is carried off-site. Debris, excess soil, and sediment shall be removed from sideboards and wheel flaps of all vehicles leaving the project site in a designated location. Every effort shall be made to adequately remove sediment and debris without the use of water. Debris and sediment dry-removed from vehicles and equipment should be cleaned and disposed of immediately to prevent further tracking. Trucks must close and lock dump body gate prior to leaving the site. Should significant amounts of sediment accumulate on surrounding roadways, it shall be removed promptly. General Housekeeping Catch basins near the construction entrance and downslope from the proposed activity, if any, shall be fitted with inlet protection consisting of fabric silt bags to trap any sediment generated from construction activities. These devices/ inserts shall be inspected regularly and cleaned or replaced when necessary. Accumulated sediment shall be collected and disposed of in a pre- approved location by the contractor as directed by the engineer. Construction dust shall be minimized by stabilized disturbed areas as quickly as possible. Dust control will be implemented as needed during demolition of existing structures, after ground disturbance has begun, and during windy conditions while ground disturbance is occurring. The contractor shall have on site or immediate access to a water truck for the duration of the project to control dust. Paved areas will be sprayed to minimize dust as needed. During construction, the site shall have a covered dumpster for the disposal of packaging and general construction debris. The site shall also have portable sanitary facilities in an amount CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 4 adequate to serve the number of workers. These facilities shall be cleaned regularly, and not placed within buffer zone to a resource area. All demolition debris or impacted soils shall be promptly removed from the site and properly disposed of in accordance with all applicable laws. All trucks and containers leaving the site shall be covered. Burial of any stumps, solid debris, and/or stones or boulders on-site is prohibited unless otherwise indicated by the engineer. Any building products, paints, or fuels will be stored in appropriate containers and secured to prevent the potential for spills. These materials will be stored and handled in accordance with the requirements set forth in the site specific SWPPP. The Contractor will use the utmost care in minimizing the risk of spills at the construction site. The potential risk for spills will be minimized by storing chemicals and petroleum products in locked, labeled, and properly ventilated storage containers. In the unlikely event of a spill, the Contractor will immediately clean up any and all spills of fuel, oil, or other potentially hazardous materials. Any and all reportable spills will be reported to the proper authorities within the required timeframe(s). The appropriate materials to respond and cleanup a spill will be maintained on-site at all times by the Contractor. Appropriate equipment for a spill kit may include oil booms, gloves, goggles, speedy dry or equivalent, sand, sawdust, plastic and metal containers, rags and mops. Any materials used in spill cleanup will be stored in appropriate containers after use, removed from the site, and disposed of at an appropriately-licensed facility. Stationary petroleum-fueled equipment such as generators and pumps shall be kept within a designated containment area equipped with appropriate measures, such as containment pads, barriers, and spill kits, to prevent leaked or spilled fuel or lubricants from reaching waters or stormwater systems. Place as far from stormwater inlets or waters as possible. Fueling of vehicles will generally occur off-site at a facility regulated for that purpose. Employees will be trained on pollution prevention measures to prevent and contain spills and leaks during on-site fueling activities, if any. Any on-site fueling will take place greater than 100 feet from a wetland or water body, and at least 25 feet from a stormwater inlet. Construction vehicle washing shall be conducted offsite at facilities designed and regulated for that activity. No construction vehicle washing shall be conducted on site. Washing tools and containers used for paint or similar chemicals are to be washed into a leak- proof container or leak-proof lined pit. All wash stations are to be located 100 feet from any CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 5 resource area and as far from natural drainage features or storm inlets as feasible. Liquid waste will not be disposed of in any way that would allow them to drain into a body of water, or on the ground where infiltration may occur. If concrete is used, hardened concrete shall be broken up and placed into the appropriate dumpster or trash receptacle. Concrete washout shall be directed to a lined container as detailed on the project plans. Should impacted soils be encountered, they shall be handled in accordance with applicable regulations and as directed by a Massachusetts Licensed Site Professional (LSP). Dewatering Dewatering actives will be required during construction. Any dewatering will be conducted in accordance with all applicable regulations and a dewatering plan prepared by the contractor and as approved by the Engineer and LSP. Demolition The contractor shall be responsible for promptly and properly managing all debris during the demolition of the existing pavement on site. All materials from demolition shall be legally disposed of in a manner that prevents materials from generating excessive dust and ensures minimum interference with roads, sidewalks, and streets. Site Stabilization Disturbed areas will be minimized to the maximum extent practicable. Disturbed areas where activities are complete or are temporarily inactive will be stabilized appropriately to minimize soil erosion. Stabilization measures include but are not limited to, mulching, seeding, installing erosion control matting, or tackifier. Erosion control matting shall be used on disturbed slopes greater than 2H:1V to reduce the potential for erosion and downgradient erosion. Construction Sequence The construction sequence is not intended to prescribe definitive construction methods and should not be interpreted as a construction specification document. However, the contractor shall follow the following general principles during the construction phase: • Protect and maintain existing vegetation wherever possible • Minimize the area of disturbance • To the extent possible, route unpolluted flows around disturbed areas • Install mitigation devices as early as possible • Minimize the time disturbed areas are left unstabilized • Maintain siltation control devices in proper condition CONSTRUCTION PERIOD POLLUTION PREVENTION PLAN 228 Route 28, Yarmouth MA Proposed A Plus Market 6 The contractor should use the suggested construction sequencing as a general guide and modify the suggested methods and procedures as required to best suit seasonal, atmospheric, and site-specific physical constraints for the purpose of minimizing the environmental impact of construction: Cutting and Clearing. Install temporary erosion control (TEC) devices as required to prevent transport of sediment off-site during initial stages of construction. Demolition to Limits of Construction Phase. Install TEC devices as required to prevent sediment transport. Place perimeter erosion controls around stockpiles. Stabilize all exposed surfaces that will not be under immediate construction. Store and/or dispose of all pavement as indicated and in applicable local, State, and federal regulations. Protect existing stormwater features (catchbasins, drain manholes, piping, etc.). Report to engineer when structures are exposed for verification, and any new structures encountered. Complete initial site grading. Utilities. Install sewer connection, water and fire protection services, underground electric and telephone conduit, and natural gas service. Stormwater. Install stormwater structures as shown on site plan. Provide temporary protection against sediment entering the structures. Parking Lot Paving. Fine grade gravel base and install processed gravel to the design grades. Install curbing. Compact pavement base as work progresses. Install pavement binder course for paved parking lot and driveway. Install final top course of pavement. Stripe parking spaces as shown on approved plan. Landscaping. Fine grade landscaped areas and place loam. Install plantings, mulch, and loam and seed as applicable. Final Clean-up. Complete final landscaping and site restoration. Clean inverts of pipes and catch basins. Remove sediment and debris from rip-rap outlet areas. Remove TEC devices only after permanent vegetation and erosion control has been fully established.