RecD07 2007-130744 - Laserfiche WebLink

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Exhibit "e" VEGETATED SWALE/BIORETENTION MAINTENANCE . Vegetated Swale/Bioretention area maintenance requires inspection at periodic intervals and following major storms to ensure that inlets and outlets have not clogged. . Remove any accumulated trash or sediment. . Observe the structure of the box and fix any holes, cracks, rotting or failure. Inspect inlets for channels, exposure of soil, or other evidence of erOSIOn. . Clear any obstructions and remove any accumulation of sediment. . Examine rock or other material used as a splash pad and replenish if necessary. . Inspect outlets for erosion or plugging. . Observe soil at the bottom of the swale or filter for uniform percolation throughout. If portions of the swale or filter do not drain within 48 hours after the end of a storm, the soil should be tilled and replanted. . Remove any debris or accumulations of sediment. . Examine the vegetation to ensure that it is healthy and dense enough to provide filtering and to protect soils from erosion. Replenish mulch as necessary, remove fallen leaves and debris, prune large shrubs or trees, and mow turf areas. When mowing, remove no more than 113 height of grasses. Confirm that irrigation is adequate and not excessive. Replace dead plants and remove noxious and invasive vegetation. . Abate any potential vectors by filling holes in the ground in and around the swale and by insuring that there are no areas where water stands longer than 48 hours following a storm. If mosquito larvae are present and persistent, contact San Mateo County Mosquito Abatement for information and advice. Mosquito larvicides should be applied only when absolutely necessary and then only by a licensed individual or contractor. . Routine maintenance for these water quality features should be carried out on a schedule similar to the rest of the stormwater system. This will typically require a thorough inspection and maintenance visit in late summer or early fall prior to the rainy season. Monitoring will also be required at least twice during the wet season (typically December and March). Observations and recommendations for corrective measures (if necessary) will be recorded and kept by the Stanford Outpatient Center Operation & Maintenance designee. Remedial maintenance will be performed immediately or scheduled to take place within a reasonable time frame. Page 1 of 5