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22.175 O&M Plan for Recording196 Cooke Ave Northampton, Massachusetts Stormwater Management System 1 Stormwater Management System Operation & Maintenance Plan Broad Brook Greenway Parking Area & Housing Development 196 Cooke Ave, Northampton, MA Post-Construction (City-retained property/Boggy Meadow Road) Stormwater Management System Owner: City of Northampton Party Responsible for Operation & Maintenance: City of Northampton Inspection & Maintenance Schedule: 1) Water Quality Unit The water quality unit shall be inspected and maintained according to the manufacturer’s recommendations. At a minimum, maintenance shall include the following: Maintenance shall be completed on the structure at least once per year, or more often based on sediment accumulation. Maintenance or cleaning shall be performed when the stored volume reaches a 6” depth or 15% of the sump storage capacity. Cleaning shall also be performed when oil has accumulated to 1 inch or greater depth, or immediately in the event of a fuel or oil spill. All material removed from the StormCeptor shall be disposed in accordance with applicable local, state, and federal guidelines and regulations. Post-Construction (Residential Development Property) Stormwater Management System Owner: Developer of the Housing Units Party Responsible for Operation & Maintenance: Developer of the Housing Units Inspection & Maintenance Schedule & Log: 1) Stone Diaphragm Drain The diaphragm drain shall be inspected at least four times per year and cleaned every three years or any time collected sediment is visible at the surface. Failure of the system to drain (ponding after the end of the storm) shall result in inspection and cleaning. 196 Cooke Ave Northampton, Massachusetts Stormwater Management System 2 Inspections shall identify any damage or signs of erosion within and adjacent to drain, which shall be repaired immediately. Drain shall be cleaned by removing and replacing pea stone top-dressing and removing any sediment collected on the exposed filter fabric. Stone may be washed and re-used. Oil and sediments shall be removed and disposed of in accordance with local, state and federal guidelines and regulations. It is recommended that sediment removal be performed after the completion of the spring snow melt. 2) Water Quality Swale The sediment forebay shall be inspected multiple times in the first few months after construction, and twice per year thereafter. Sediment or debris shall be cleaned out as needed, at least annually (preferred time is early spring after snow melt). Inspections shall identify any damage or signs of erosion within basins or the overflow berm. Damage shall be repaired immediately. At least twice per year, mow the buffer area, side slopes, and basin bottom. Remove grass clippings and accumulated organic matter to prevent an impervious organic mat from forming. Remove trash and debris at the same time. Use deep tilling to break up any clogged surfaces and revegetate immediately. Overflow level spreader curb shall be inspected for signs of erosion or bypassing. Any damage, erosion, or loss of vegetation shall be repaired immediately. Discharge of underdrain piping shall be inspected for erosion, damage, or flow blockage. 3) Infiltration Basin The infiltration basin shall be inspected after every major storm for the first three months and two times per year thereafter. Sediment or debris shall be cleaned out as needed, at least annually (preferred time is early spring after snow melt). Failure of the system to drain (ponding 48 hours after the end of the storm) shall result in inspection and cleaning. Inspections shall identify any damage or signs of erosion within basins or the overflow berm. Damage shall be repaired immediately. At least twice per year, mow the buffer area, side slopes, and basin bottom. Remove grass clippings and accumulated organic matter to prevent an impervious organic mat from forming. Remove trash and debris at the same time. Use deep tilling to break up any clogged surfaces and revegetate immediately. Remove sediment from the basin as necessary but wait until the floor is thoroughly dry. Use light equipment to remove the top layer so as to not compact the underlying soil. Deeply till the remaining soil and revegetate as soon as possible. Rake sediment from stone areas and remove. It is recommended that sediment removal be performed after the completion of the spring snow melt. Overflow level spreader curb shall be inspected for signs of erosion or bypassing. Any damage, erosion, or loss of vegetation shall be repaired immediately.