OTHER-2022-036-Stormwater operations and maintenance plan agreement

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Table 1 : Inspection and Maintenance Provisions for Underground Detention • Check detention chambers and pipes for any obstructions , clogging, or damage . Remove accumulated grit, leaves, and debris and dispose off-site . Biannually • Remove any trash or debris present within the drainage area and outfall area . • Inspect the detention system for structural integrity and any accumulation of liquids or solids within the unit . • If the detention is in an area that is salted regularly during winter, the system Yearly should be rinsed during the springtime to prevent salting agents from accumulating inside the pipes . Structural Integrity • Repair any cracks , spalled areas , rusted areas within the detention chambers . • Replace any crushed or collapsed pipes under the supervision of a professional engineer . • Replace the detention structure if it has severely deteriorated . • Repair eroded outfall channels with additional riprap armoring or other permanent lining material . Functionality • Sediment Accumulation As Needed o Maintain stable ground cover in the drainage area . (Typical o Sweep or vacuum sediment on pavement in the contributing drainage area . Problems ) o Any accumulated sediment in the detention unit must be disposed to a waste handling facility . • Other Pollutants o Identify and eliminate any sources of excessive oil loading . o If clogging becomes a persistent issue that prevents drawdown , a trashrack is required on the discharge orifice within the underground detention structure . For additional information or if damage has occurred at the outlet which effects the receiving water, contact the Town at Chapel Hill Stormwater Management at 919 - 969 -7246 ( RAIN ) .