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Environmental Checklist Hydrology and Water Quality General Plan Consistency Checklist 59 prevention measures during construction. Adherence to the C.3 requirements minimizes water quality impacts from new development to maintain regional compliance with the Municipal Regional Permit. Provision C.3 includes a Low Impact Development provision (C.3.c) requires that low impact development techniques be utilized to employ appropriate source control, site design, and stormwater treatment measures to prevent increases in runoff flows from new development projects. These low-impact development practices and other provisions and BMPs specified in the Municipal Regional Stormwater NPDES Permit, may require long-term operational inspections and maintenance activities to ensure the effective avoidance of significant adverse impacts associated with water quality degradation. As the project would be required to comply with regulations under the NPDES permit and with Provision C.3, impacts would be less than significant, consistent with the General Plan EIR. LESS THAN SIGNIFICANT OR LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED 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 General Plan EIR concluded that implementation of 2035 General Plan policies and regulatory provisions would ensure that future development would not deplete groundwater supplies substantially. The project involves residential growth of a density consistent with that allowed in the 2035 General Plan and would not use water or prevent recharge at a rate beyond that anticipated in the General Plan EIR. Therefore, the project would have no impacts beyond those previously identified in the General Plan EIR. LESS THAN SIGNIFICANT OR LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED 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 General Plan EIR determined this impact to be less than significant, as the City requires detention and stormwater treatment facilities to adhere to City standards (City of San Leandro 2016a). The project would be constructed in compliance with City standards, including those regarding stormwater conveyance and treatment. While the implementation of the project would alter the drainage pattern of the site, it would not alter the course of a stream or river, and with construction of on-site bioretention basins and implementation erosion control measures, as described above, the project would not result in substantial erosion or siltation off site. Therefore, the project would have no impacts beyond those previously identified in the General Plan EIR. LESS THAN SIGNIFICANT OR LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED c.(ii) 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 substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site? The General Plan EIR determined this impact to be less than significant, as implementation of 2035 General Plan policies and action items would limit runoff from new development sites. The project would comply with applicable 2035 General Plan policies, including those regarding runoff water