The sediment forebay will be cleaned out with a ‘bobcat’ type of machinery annually. Maintenance will be performed once 3” of sediment accumulates in the settling basin. The sand filter media will be tilled every 5 to 7 years and replaced if performance declines dramatically. Once a year or when drainage begins to slow or pond, the top 3-5 inches of the sand filter will be raked. If the sand filter does not drain within 40 hours, maintenance is required. The settling basin and sand filter include sediment traps at each inlet designed to be cleaned with a small excavator or by hand. Conveyance pipes and drop inlets will be cleaned when inspections reveal trash, debris or sediment accumulation over 3”. Inspect three times annually and after major storm events. Remove invasive weeds and tree seedlings to prevent compromise of the impermeable liner. If pine needle obstruct inlet, remove pine needles with street sweeping.

Cave Rock GID intends to inspect and maintain the sediment forebay, the dry basin, bed filter, and conveyances. The dry basin will be inspected in accordance with the protocols described in the BMP RAM User Manual V2 (2NDNATURE 2015) or acceptable equivalent method as required by the NPDES permit. These inspections are used to assess condition/performance and initiate maintenance. Inspections of all BMPs will take place annually during spring, summer, or fall.