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Legend: Applicant = project applicant, City = City of Redwood City <br />Page 41 May 18, 2004 WP9.016451MMCHT.645 <br />MONITORING <br />VERIFICATION <br />IDENTIFIED IMPACT <br />RELATED MITIGATION MEASURE <br />Impl. <br />Type of Impl. <br />Monitoring and <br />Timing <br />Signature <br />Date <br />(CONDITION OF APPROVAL) <br />Entity <br />Action <br />Verification Entity <br />Requirements <br />minimize slormwater runoff (through <br />maximization of local infiltration and <br />detention storage), settle out fine <br />sediments, and filter contaminants. <br />Oil /grease traps, sand filters, or similar <br />in -line filtration systems for storm drain <br />systems should also be considered. <br />Such traps, filters, or separators must <br />be accompanied by a clean out/ <br />maintenance program that ensures <br />acceptable trap efficiencies, specifies <br />appropriate disposal procedures, and <br />reduces the risk that the traps become <br />sinks for pollutants. <br />• Institute a regular schedule of street <br />and parking lot sweeping. The <br />frequency of cleaning shall be higher <br />(twice monthly) during the winter rainy <br />season, yet maintained year - round. <br />Regular cleaning of paved surfaces <br />reduce the "first flush" phenomenon <br />wherein the highest concentration of <br />contaminants are flushed off the <br />surfaces during the early portion of a <br />runoff event. Cleaning practices may <br />have to be modified if porous pavement <br />systems are employed. <br />• Where bioswales are incorporated in <br />site development plans to convey <br />stormwater from paved surfaces to <br />Redwood Creek or the marinas, <br />implement design guidelines described <br />in Start at the Source: Design Guidance <br />for Stormwater Quality Protection, <br />including the following: <br />Swale lengths should be a minimum of <br />100 feet to provide effective filtering; <br />and <br />If swale slopes exceed two percent, <br />check structures should be installed at <br />Legend: Applicant = project applicant, City = City of Redwood City <br />Page 41 May 18, 2004 WP9.016451MMCHT.645 <br />