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City of San Leandro 2824 Halcyon Drive Residential Project 72 Project operation would have the potential to violate water quality standards resulting from pollutants such as oil, sediment, and pesticide residue according to the General Plan EIR. Under Provision C.3 of the Municipal Regional Stormwater Permit (MRP), post-construction stormwater requirements for the project would be regulated by the Alameda County Clean Water Program as it would add more than 10,000 square feet of impervious area to the project site. Additionally, the project would be required to construct and maintain hydromodification measures to the maximum extent practicable to reduce discharge of pollutants (San Francisco Regional Water Quality Control Board 2015). Regulated projects within the City, which would include the proposed project, would be required to prepare a Stormwater Management Plan that includes post-construction BMPs that control pollutant levels and an Operations and Maintenance Plan for post-construction water quality and quality control measures pursuant to the Alameda County C.3 provisions (City of San Leandro 2016b). General Plan Policy EH-4.1 and Action EH-4.1.B mentioned above would further reduce impacts. The project would not violate water quality standards or otherwise substantially degrade surface or ground water quality through compliance with the Alameda County Clean Water Program and General Plan policies and actions. Impacts from operation-related water quality impacts would be less than significant. b. Would the project substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? The project would increase impermeable surfaces on the project site by 75,760 square feet (Appendix HYDRO). The project includes landscaped and bioretention areas which would enhance groundwater recharge on the project site. These landscaped and bioretention areas would be LID measures as required under C.3 provisions of the Alameda County Clean Water Program and would increase the potential for groundwater recharge. As described in the General Plan EIR, use of site design features pursuant to C.3 provisions such as the bioretention areas and water use efficiency measures mandated by the Water Conservation Act of 2009 and General Plan Policies OSC-7.2, OSC- 7.3 and OSC-7.4 focused on encouraging drought-tolerant landscaping and efficient water use in development would further ensure the project would not substantially impact groundwater recharge. As stated above, the project would be required to implement water use efficiency measures mandated by the Water Conservation Act of 2009 and would implement General Plan Policy OSC-7.4 which would reduce water use on the project site through increased water efficiency. In addition, as stated in the General Plan EIR, the City of San Leandro gets 100 percent of its water supply from surface water. As such, the project would not use groundwater and would not substantially decrease groundwater supply. Therefore, the project’s impacts on groundwater supplies and recharge would be less than significant. c.i. Would the project substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would result in substantial erosion or siltation on- or off-site? The proposed project would increase impervious surfaces on the project site by 75,760 square feet (Appendix HYDRO). The proposed project would not alter the drainage pattern on the project site by altering the course of a stream or river as there are no streams or rivers on the project site. The closest body of water is San Lorenzo Creek approximately 1.3 miles south of the project site.