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06/07/2004 and pesticide /herbicide residues and could further impair the quality of stormwater discharged to Redwood Creek (Impact 9 -2). Mitigation: The Project would be required to obtain a National Pollution Discharge Elimination System permit, based among other things on a Stormwater Pollution Prevention Plan containing Best Management Practices, approved by the State Water Resources Quality Control Board. The Best Management Practices would comply with regulations adopted or to be adopted as part of the San Mateo Countywide Stormwater Pollution Prevention Program and the City's Municipal Stormwater Permit and would apply specific provisions or their equivalents as further specified in Mitigation Measure 9 -2. Findings: Obtaining the NPDES permit and implementation of best practices under the SWPPP and in accordance with specified City and county standards would reduce the potential stormwater contamination effects, otherwise potentially environmentally significant, to a level of insignificance. If the permit is not obtained and implementation measures identified, the Project would not go forward. C. Temporary Water Quality Impacts Potential Impact: Dredging and initial installation of sheet piling would disturb marina bottom sediments and create temporary water quality impacts (Impact 9- 3). Mitigation: The Project would be required to obtain an Individual Department of Army Fill Permit, meeting all requirements of the Corps of Engineers and cooperating agencies, to obtain and submit to the Corps and other agencies with jurisdiction water quality and sediment test results from a certified laboratory and to use a suction dredge and a Corps- reviewed appropriate method for sheet pile and bulkhead installation (Mitigation 9 -3). Findings: Obtaining the Department of Army fill permit and meeting associated Corps of Engineers and other agency requirements, together with certified laboratory testing and approved dredging, sheet pile and bulkhead methods, would reduce dredging and sheet pile and bulkhead installation water quality impacts, otherwise potentially environmentally significant, to a level of insignificance. If the required permits are not obtained, the Project would not go forward. D. Permanent Sedimentation and Water Quality Impacts Potential Impact: Project implementation, including an approximately 10 acre reduction in open water area, would reduce the tidal prism which scours tidal sediments from marina entrances and Redwood Creek, causing siltation to increase in those areas. This could cause more frequent dredging and spoils disposal, disturbing water quality (Impact 9 -4). Mitigation: The Project would be required to verify to the City Engineer's satisfaction that marina inlets will operate at close to a self- scouring condition, and to 1289 \02 \179278.2 25 Atty /Reso /Reso.1470 14590 060804 Muff # 304 Bin 26