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� �-55 <br /> , and pesticide/herbicide residues and could further impair the quality of stormwater <br /> z �' discharged to Redwood Creek (Impact 9-2). <br /> Mitigation: The Project would be required to obtain a National Pollution <br /> Discharge Elimination System permit, based amony other things on a Stormwater <br /> Pollution Prevention Plan containing Best Managemeit Practices, approved by fhe <br /> State Water Resources Quality Control Board. The Best Management Practices would <br /> comply with regulations adopted or to be adopted as part of the San Mateo Countywitle <br /> Stormwater Pollution Prevention Program and the City's Municipal Stortnwater Permit <br /> and would apply specific provisions or their equivalents as further spec�ed in Mitigation <br /> Measure 9-2. <br /> Findings: Obtaining the NPDES permit and implementation of best <br /> practices under the SWPPP and in accordance with specified City and county standards <br /> would reduce the potentia� stormwater contamination effects, otherwise potentially <br /> environmentally significant, to a level �f insignificance. If the permit is not obtained and <br /> implementation measures identified, the Project would not go forvvard. <br /> C. Temporarv Water Qualitv Impacts <br /> Potential Impact: Dredging and initial instaliation of sheet piling would <br /> disturb marina bottom sediments and create temporary water quality impacts (Impact 9- <br /> 3). <br /> — Mitigation: The Project would be required to obtain an Individual <br /> Department of Army Fill Permit, meeting all requirements of the Corps of Engineers and <br /> cooperating agencies, to obtain and submit to the Corps and other agencies with <br /> jurisdiction water quality and sediment test results from a certified laboratory and to use <br /> a suction dredge and a Corps-reviewed appropriate method for sheet pile and bulkhead <br /> installation (Mitigation 9-3). <br /> Findings: Obtaining the Department of Army fill permit and meeting <br /> associated Corps of Engineers and other agency requirements, together with certified <br /> laboratory testing and approved dredging, sheet pile and bulkhead methods, would <br /> reduce dredging and sheet pile and bulkhead installation water quality impacts, <br /> othervvise potentially environmentally significant, to a level of insignificance. If the <br /> required permits are not obtained, the Project would not go forward. <br /> D. Permanent Sedimentation and Water Quality Impacts <br /> Potentiai Impact: Project implementation, including an approximately 10 <br /> acre reduction in open water area, would reduce the tidal prism which scours tidal <br /> sediments from marina entrances and Redwood Creek, causing siltation to increase in <br /> those areas. This could cause more frequent dredging and spoils disposal, disturbing <br /> water quality (Impact 9-4). <br /> Mitigation: The Project would be required to verify to the City Engineers <br /> — satisfaction that marina inlets will operate at close to a self-scouring condition, and to <br /> 7289\0211792782 25 <br /> Atty/Reso/Reso.14�0 <br /> 052004 <br />