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INSPECTION AND MAINTENANCE CHECKLIST -BIORETENTION AREA <br /> ❑ Inspect inlets for channels, exposure of soils, or other evidence of erosion. <br /> E Clear any obstructions and remove any accumulation of sediment. <br /> ❑ Examine rock or other material used as a splash pad and replenish if necessary. <br /> ❑ Inspect outlets for erosion or plugging. <br /> ❑ Inspect side slopes for evidence of instability or erosion and correct as necessary. <br /> ❑ Observe soil at the bottom of the swale or filter for uniform percolation throughout. If <br /> portions of the swale or filter do not drain within 48 hours after the end of a storm, the soil <br /> should be tilled and replanted. <br /> ❑ Remove any debris or accumulations of sediment. <br /> ❑ Examine the vegetation to ensure that it is healthy and dense enough to provide filtering <br /> and to protect soils from erosion. <br /> ❑ Replenish mulch as necessary, remove fallen leaves and debris, prune large shrubs or <br /> trees, and mow turf areas. <br /> E When mowing, remove no more than 1/3 height of grasses. <br /> ❑ Confirm that irrigation is adequate and not excessive. <br /> ❑ Replace dead plants and remove noxious and invasive vegetation. <br /> ❑ Abate any potential vectors by filling holes in the ground in and around the swale and by <br /> insuring that there are no areas where water stands longer than 48 hours following a <br /> storm. <br /> ❑ If mosquito larvae are present and persistent, contact the Alameda County Mosquito <br /> Abatement District for information and advice. Mosquito larvicides should be applied only <br /> when absolutely necessary and then only by a licensed individual or contractor. <br /> 6214.010-D2.doc <br />