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MiG 7.A. - Page 205 City of Redwood City tir�Haaenaum October 8, 2012 Page 3-42 3.6 HYDROLOGY AND WATER QUALITY The relationships of the current Pete's Harbor project to the previously certified 2003 EIR hydrology and water quality impact and mitigation conclusions are described below. Impact 9-1 Analysis: Temporary Soil Erosion Increase and Sedimentation Impacts During Project Construction. The 2003 EIR indicated that filling, grading, and the removal of existing vegetative cover for the Marina Shores Village project would expose soil to erosion, and the potential for significant sedimentation impacts on Redwood Creek and on-site marinas would result. The associated 2003 EIR mitigation described the need to ensure that the National Pollution Discharge Elimination System (NPDES) requirements administered by the State Water Resources Control Board (SWRCB) for the purpose of controlling such construction-period soil erosion and sedimentation were imposed on the project, including mandatory preparation and implementation of a project-specific Stormwater Pollution Prevention Plan (SW PPP). The current Pete's Harbor project would have reduced but still potentially significant construction-related soil erosion and sedimentation impacts. Conclusion, No change. It is noted that existing vegetative cover on the Pete's Harbor property is minimal, consisting of introduced perimeter and parking lot trees. The mitigation identified in the 2003 EIR for Impact 9-1 remains applicable to the current Pete's Harbor project and remains sufficient to reduce this impact to a less-than-significanf level. Impact 9-2 Analysis: Increased Stormwater Contaminant Loading--Potential Violation of Water Quality Standards. The certified 2003 EIR for the previous project concluded that project operation would increase heavy metal, oil, grease, and pesticide/herbicide residues on- site due primarily to vehicular landscape maintenance activity, potentially causing a significant water quality impact associated with project site runoff. The associated 2003 EIR mitigation required that the SWPPP requirement identified under Mitigation Impact 9-1 above incorporate Best Management Practices (BMPs) to control ongoing, post-construction stormwater contaminant loading, including compliance with the C.3 regulations adopted as part of the San Mateo Countywide Stormwater Pollution Prevention Program (STOPPP). The Impact 9-2 language in the 2003 EIR referred, in part, to the potential contaminant loading impacts of "office" development and a reconfigured marina, which would not occur under the current Pete's Harbor project; however, the identified impact would still result. Also, the "proposed, new C.3 regulations" referred to in the 2003 EIR have since been adopted and are now in effect. The current Pete's Harbor project would therefore have reduced, but still potentially significant long-term stormwater contaminant loading impacts. Conclusion. Modified impact and mitigation. With the minor modifications noted above, the mitigation identified in the 2003 EIR for Impact 9-2 remains applicable to the current Pete's Harbor project and remains sufficient to reduce this impact to a less-than-significant level. Impact 9-3 Analysis: Temporary Impacts from Proposed Flushing Channel Construction (Dredging) and Marina Filling Operations. The certified 2003 EIR indicated that dredging necessary to create the proposed project flushing channel and installation of sheet piling T.•110695Wddenduml3(10695-01).doc