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CITY OF EVERETf STORMWATER MANAGEMENT MANUAL <br /> pumped from the trap,pond,or tank thmugli the filtcation system in a rapid sand filtration system. <br /> Slow sand filtration systems arc designed as flow tfwugh systems using gravity. <br /> IMainfenance Sfandards <br /> Rapid sand filters typically have automatic backwash systems that are triggered by a pre-set pressure drop <br /> across the filter. If thc backwash water volume is oot largc or substantially morc hubid than the <br /> stortnwater stored in the holding pond or tank,backwash rehw to thc pood or tank may bc appropnate. <br /> However, land application or another means of trcatment and disposal mey be necessary. <br /> Scrcen,bag,and fibcr filters must bc cleancd and/or repiaccd when lt�cy become clogged. <br /> Scdiment shall be removed from the storage and/or treatment ponds as necessary. Typically,sediment <br /> rcmoval is required oncc or twice during a wet scason and at the decommissioning of thc ponds. <br /> Volume II—ConsWction Stormwater Pollufion Prevention <br /> 3-67 <br />