Agenda - 06-21-2022; 8-l - Orange County Southern Campus Expansion Stormwater Operations and Maintenance Plan Agreement with Town of Chapel Hill (2501 Homestead Road, Chapel Hill)

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18 Table 1: Inspection and Maintenance Provisions for Underground Detention OF MAINTENANCE ACTIVITIES 4 FREQUENCY -A • 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).