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Potentially Significant Potentially Unless Less than Significant Mitigation Significant Impact Incorporated Impact No Impact Comments: a: The site is currently vacant and.the runoff releases overland onto Martinez Street and Alvarado Street. Ultimately,both streets discharge into the San Pablo Bay sub-basin and the San Leandro Watershed. The City of San Leandro Municipal Code regulates the discharge of storm water and the potential for pollutant transport to water resources through Title 3: Health and Safety, Chapter 3-15 Storm Water Management and Discharge Control. Chapter 3-15 requires the best management practices (BMPs) for new development and redevelopment and compliance with BMPs.where BMP guidelines or requirements have been adopted by any federal, state, regional and/or City agency (Section 3-15-215 — Reduction of Pollutants in Storm Water). Additionally; storm water dischargers are regulated through Title 7: Maps, Buildings,and Subdivisions,Chapter 1-12 Grading, Excavations and Fills. The applicable water quality objectives and standards for the San Pablo Bay sub-basin is listed in the San Francisco Bay Basin Water Quality Control Plan Basin (Basin Plan)prepared by the Regional Water Quality Control Board (RWQCB) in • compliance with the federal Clean Water Act (CWA) and the State Porter-Cologne Water Quality Control Act. Section 303(d)of the CWA requires that the states make a list of waters that are not attaining standards after the technology-based limits are put into place. For waters on this list,the states are to develop total maximum daily loads or TMDLs. TMDLs are established at the level necessary to implement the applicable water quality standards. The proposed project would be subject to existing TMDLs that are considered protective of water quality. Consequently, the proposed project would not violate water quality standards or waste discharge requirements and the impacts would be less than significant. • Mitigation Measure#10: Prior to issuance of a grading permit;the project applicant must prepare and Implement an erosion and sediment control plan (ESCP) including Interim and permanent erosion and sediment control measures,and a pollutant control plan(PCP). •Implementation of Mitigation Measure#10 reduces potential impacts to a less than significant level. Mitigation Measure #11: Prior to issuance of a grading permit, the project applicant shall file the required documentation to the State Water Resources Quality Board and prepare a Storm Water Pollutant Prevention Plan (SWPPP)which will be reviewed and approved by the City Engineer. The City Engineer must conduct inspections prior to issuing a certificate of occupancy,to ensure that requirements are complied with. Implementation of Mitigation Measure#11 reduces potential Impacts to a less than significant level. Mitigation Measure #12: The applicant will comply with applicable waste discharge requirements and municipal code requirements including preparation of a SWPPP for construction activities and compliance with the Alameda Countywide Clean Water Program (ACCWP). These permit programs are designed to prevent violation of water quality standards through mitigation and control of pollutant transport in storm water runoff and infiltrating waters. The City of San Leandro Municipal Code ensures that permit conditions are met. • Implementation of Mitigation Measure#12 reduces potential impacts to a less than significant level. b: The project site is now vacant. The proposed project would replace a vacant site with a mix of offices, commercial uses and parking uses. The majority of water supplies serving the City of San Leandro are obtained from the East Bay Municipal Utilities District (EBMUD). The proposed project would not include development of any groundwater supply wells and would rely on EBMUD•water supplies. About 90 percent of EBMUD water supplies are surface water resources from the Mokelumne River system with the rest from runoff from local watersheds to terminal reservoirs, such as Lake Chabot(EBMUD 2005). There are few, if any wells in the area and the project area is small when compared to the total runoff"capture area.' As there would be no long-term impact of the project on the local groundwater table and as water supplies would not involve local groundwater resources,there are no new wells proposed. Therefore,local groundwater table impacts would be less than significant. • • 18