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o Sweep or vacuum sediment on pavement in the contributing drainage <br /> area. <br /> o If sedimentation or clogging is occurring in the inlet, design modification <br /> may be needed to ensure adequate drop or slope between inlet and filter <br /> bed . <br /> o If sediment has accumulated in the forebay area or basin reducing its <br /> depth to 75 % of the original design depth , remove the sediment, <br /> restabilize the area , and replace with clean rock . Search for the source of <br /> the sediment in the drainage area and remedy the problem if possible . <br /> • If greater than one feet of localized bed sinking and/or sediment is observed by <br /> the underdrain or overflow, conduct a test pit excavation by hand to examine <br /> subsurface conditions . Look for sediment across layers , discoloration , voids , loss <br /> of material . Cause of bed sinking may be breached material layers , poor <br /> connections , or damaged pipes . Repair the test pit to full functionality without <br /> cross contamination of the individual material layers . <br /> For additional information or if damage has occurred at the outlet which effects the <br /> receiving water, contact the Town at Chapel Hill Stormwater Management at 919- <br /> 969 -7246 ( RAIN ) . <br />