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City of San Leandro Housing Element Update (2015-2023) Project Initial Study and Environmental Checklist cion, and hazardous materials contamination of runoff during construction. Compliance with the provisions of the NPDES and Chapter 7-12 of the San Leandro Municipal Code, which requires project applicants to prepare erosion control and sedimentation control plans for review by the City Engineer prior to the start of any project construction, would serve to control sedimentation, and erosion attributed to runoff. Given that the Housing Element itself would not result in the direct development of residential units, future anticipated development would be required to comply with the City's Municipal Code regarding erosion con- trol, as well as the 2002 General Plan goals, policies, and actions related to water quality included in the Envi- ronmental Hazards Element. Specifically, General Plan policies 32.01 through 32.08 provide program -level guidance to mitigate potential water quality impacts. Implementation of the Housing Element would not ex- ceed waste discharge requirements established by the Regional Water Quality Control Board, and would not violate the NPDES Permit for stormwater discharge. As appropriate, individual development projects will be subject to environmental review and project -specific measures may be required to mitigate water quality impacts. Therefore, implementation of the proposed Project would have a less -than -significant impact on water quality. b) Would the project substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there would be a net deficit in aquifer volume or a significant lowering of the local groundwater table level? Potential future development under the proposed Project would have a significant environmental impact if it would result in a net deficit in aquifer volume or a lowering of the local groundwater table level. Other phys- ical changes that could occur as a result of implementing the Housing Element would occur within the exist- ing urbanized environment in areas where existing development occurs and would not interfere with groundwater recharge. The Housing Element only identifies sites that have previously been zoned for resi- dential use and would not result in any new development potential in the city and no additional water de- mand would occur. Further, goals, policies, and actions under the Community Services and Facilities Ele- ment of the 2002 General Plan seek to maintain adequate water supply and infrastructure as development occurs. Specifically, General Plan Policy 32.10 protects San Leandro's groundwater from the potential ad- verse effects of urban uses, and will remain in effect for the duration of the Housing Element planning peri- od. Consequently, impacts would be less than significant. c) Would the project substanfialjalter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? The proposed Project would result in a significant environmental impact if it would require modifications to drainage patterns that could lead to substantial erosion of soils, siltation, or flooding. Such drainage pattern changes could be caused by grade changes, the exposure of soils for periods of time during which erosion could occur, or alterations to creekbeds. Potential future development as a result of the proposed Project would occur within the urbanized environment and would not involve the direct modification of any water- course. If unforeseen excessive grading or excavation are required, then pursuant to the State Water Quality Control Board (SWQCB) Construction General Permit, a SWPPP would be required to be prepared and im- plemented for the qualifying projects under the proposed Project, which would ensure that erosion, siltation, and flooding is prevented to the maximum extent practicable during construction. The General Plan itself includes policies to minimize siltation and erosion from construction, and recommends the use of best man- agement practices on individual development sites. Overall, construction associated with potential future development anticipated under the Housing Element would not result in substantial erosion, siltation, or flooding either on- or off-site, and associated impacts would be less than significant. Page 134