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L <br /> Potential Potential > <br /> co co <br /> vD <br /> Significance Significance <br /> Without Mitigation With N -o <br /> Impacts Mitigation Mitigation Measures Responsibility Mitigation ca <br /> 0 <br /> - cp <br /> similar in-line filtration systems for storm drain <br /> systems should also be considered. Such �p <br /> traps,filters, or separators must be <br /> accompanied by a clean out/maintenance <br /> program that ensures acceptable trap <br /> efficiencies, specifies appropriate disposal <br /> procedures, and reduces the risk that the traps <br /> become sinks for pollutants. <br /> • Institute a regular schedule of street and <br /> parking lot sweeping. The frequency of <br /> cleaning shall be higher(twice monthly)during <br /> the winter rainy season, yet maintained year- <br /> round. Regular cleaning of paved surfaces <br /> reduce the"first flush" phenomenon wherein the <br /> highest concentration of contaminants are <br /> flushed off the surfaces during the early portion <br /> of a runoff event. Cleaning practices may have <br /> to be modified if porous pavement systems are <br /> employed. <br /> • Where bioswales are incorporated in site <br /> development plans to convey stormwater from <br /> paved surfaces to Redwood Creek or the <br /> marina, implement design guidelines described <br /> in Start at the Source:Design Guidance for <br /> Stormwater Quality Protection, including the <br /> following: <br /> - Swale lengths should be a minimum of 100 <br /> feet to provide effective filtering; and <br /> co <br /> - If swale slopes exceed two percent, check <br /> structures should be installed at co <br /> appropriate intervals along the length of the in <br /> � CD <br /> -0 ). <br /> S = Significant m m _ <br /> LS = Less than significant - a <br /> SU = Significant unavoidable impact s 3 g <br /> NA = Not applicable <br /> T:110695 Pete's Harbor EIR Addendumlrevised addendum no 21Table 1-1(10695-01).doc <br />