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IDENTIFIED IMPACT Impact 9 -2: Increased Stormwater Contaminant Loading -- Potential Violation of Water Quality Standards. The proposed high- density residential /office, reconfigured marina development, and related landscaping on the project site would result in incremental increases in the stormwater contaminant loading for some heavy metals, as well as oil and grease and pesticidetherbicide residues. Project contaminant input could further impair the already impaired quality of stormwater discharged to Redwood Creek. This possible project effect is considered a potentially significant impact. RELATED MITIGATION MEASURE (CONDITION OF APPROVAL) requirements. The project shall be required to fully implement the erosion control and other water quality measures cited in the SW PPP and to monitor these measures during a specified period following completion of project construction. The RWQCB would be responsible for inspecting these measures, typically on an annual basis, while the sponsor would be responsible for implementing any remedial measures if the Board indicated that site stormwater quality objectives were not being met. The City Engineering Division would also be responsible for post - construction inspection of all measures that would eventually become part of the maintained infrastructure of the project, including source control and water quality treatment measures. Implementation of these measures would reduce the construction - related soil erosion and sedimentation impacts to a less - than - significant level. Mitigation 9 -2. Apply the following site - appropriate Best Management Practices (BMPs) or their equivalents as part of the project Stormwater Pollution Prevention Plan (SWPPP), including measures required to comply with the proposed, new C.3 regulations to be adopted as part of the San Mateo Countywide Stormwater Pollution Prevention Program (STOPPP), in order to comply with the requirements of the NPDES General Permit and imminent updating of the Municipal Stormwater Permit for Redwood City: Integrate start-at- the - source measures for stormwater control and treatment into the project stormwater drainage design. Such measures could include pervious parking lots, infiltration basins, vegetated (grass) swales ( "bioswales "), or other measures designed to Legend. Applicant = project applicant, City = City of Redwood City MOIL.. JRING Impl. Type of Impl. Entitv Action Applicant Apply BMPs or equivalents, as indicated. VERIFICh. ON Monitoring and Timing Signature Date Verification Entity Requirements City Design measures prior to grading permit issuance; implement measures during construction and throughout life of project Page 40 May 18, 2004 WP9.016451MMCHT.645