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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12 o Sweep or vacuum sediment on pavement in the contributing drainage area. o If sedimentation or clogging is occurring in the inlet, design modification may be needed to ensure adequate drop or slope between inlet and filter bed. o If sediment has accumulated in the forebay area or basin reducing its depth to 75%of the original design depth, remove the sediment, restabilize the area, and replace with clean rock. Search for the source of the sediment in the drainage area and remedy the problem if possible. • If greater than one feet of localized bed sinking and/or sediment is observed by the underdrain or overflow, conduct a test pit excavation by hand to examine subsurface conditions. Look for sediment across layers, discoloration,voids, loss of material. Cause of bed sinking may be breached material layers, poor connections, or damaged pipes. Repair the test pit to full functionality without cross contamination of the individual material layers. 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).