Planning Commission meeting agenda packet 7-9-25

City of Pleasanton—Vineyard Avenue Residential Project Consistency Checklist 15183 Consistency Checklist 112 a) Surface and Groundwater Quality Would the project: Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? Summary of Housing Element Update FEIR The Housing Element Update FEIR indicated that future development consistent with the Housing Element Update would involve grading, excavation, and removal of vegetative cover that has the potential to result in runoff that contains sediment and other pollutants that could degrade surface and groundwater quality if not properly controlled. Furthermore, all future development consistent with the Housing Element Update could add additional areas of impervious surfaces within the City and could therefore increase the volume of pollutants that are typically associated with urban runoff into the stormwater. The Housing Element Update FEIR concluded that compliance with mandatory NPDES permit requirements, adherence to the Municipal Code, and implementation of General Plan goals, policies, and actions would ensure that impacts related to water quality degradation from construction activities would be less than significant. Operation of future development consistent with the Housing Element Update would be required to comply with regulations enforced by the RWQCB. In addition to existing State regulations, future projects would also be required to comply with requirements of the Municipal Code and policies and actions included in the General Plan related to water quality. Therefore, during operation, future development consistent with the Housing Element Update would not violate any water quality standards or Waste Discharge Requirements (WDR) or otherwise substantially degrade surface or groundwater quality and impacts would be less than significant. Proposed Project Analysis and Conclusion Construction activities, such as grading, excavation, import of fill, and trenching for site improvements, would result in the disturbance of on-site soils. The exposed soils have the potential to affect water quality in two ways: 1) suspended soil particles and sediments transported through runoff; or 2) sediments transported as dust that eventually reach local water bodies. Spills or leaks from heavy equipment and machinery, staging areas, or building sites also have the potential to enter runoff. Typical pollutants include, but are not limited to, petroleum and heavy metals from equipment and products such as paints, solvents, and cleaning agents, which could contain