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City of Pleasanton 2023-2031 (6th Cycle) Housing Element Update CEQA Findings of Fact and Statement of Overriding Considerations FirstCarbon Solutions 49 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480022/FOF/21480022 Pleasanton Housing Element FOF.docx pervious surfaces in new developments and requiring projects to meet federal, State, regional, and local stormwater requirements, including stormwater infiltration (Draft Program EIR, Page 3.9-36). Potential Effect Cumulative Impact: Cumulative impacts related to hydrology and water quality would be less than significant. (Draft Program EIR, Page 3.9-36). Findings: Less than significant impact. Facts in Support of Findings: The geographic context for an analysis of cumulative impacts is the Eastern Alameda Creek watershed, which encompasses about 675 square miles between Mount Hamilton and Mount Diablo. Cumulative development in the watershed contributes to an incremental increase in impervious surfaces that could introduce pollutants that are typically associated with urban runoff into the stormwater and/or contribute to cumulative flood conditions in the watershed. Cumulative development could also contribute to water quality impacts in the watershed from construction activities. Cumulative impacts would be less than significant because future cumulative development, infrastructure, and planning projects would be subject to local, State, and federal permit requirements and would be required to comply with City and Alameda County ordinances and policies, as well as other water quality regulations that control construction-related and operational discharge of pollutants in stormwater. The water quality regulations implemented by the RWQCB take a basin- wide approach and consider water quality impairment in a regional context that addresses the entire geographic context of the Eastern Alameda Creek Watershed. The Housing Element Update’s less than significant incremental contribution to less than significant cumulative impacts would not be cumulatively considerable. As discussed above, development resulting from implementation of the Housing Element Update would be subject to General Plan policies and programs and the City’s Municipal Code and Zoning Ordinance to reduce hydrology and water quality impacts. As previously discussed, future development consistent with the Housing Element Update would be required to conform to federal, State, and local policies that would reduce hydrology and water quality impacts to less than significant levels. If applicable, any additional new development consistent with the Housing Element Update would be subject, on a project-by-project basis, to independent CEQA review. More specifically, potential changes related to stormwater quality, stormwater flows, drainage, impervious surfaces, and flooding would be minimized by the implementation of stormwater control measures, infiltration, and review by the City Engineer to integrate measures to reduce potential flooding impacts (Draft Program EIR, Page 3.9-36–37). 1.5.10 - Land Use Potential Effect Impact LAND-1: Development consistent with the Housing Element Update, rezonings, and General Plan and Specific Plan Amendments would not physically divide an established community. (Draft Program EIR, Page 3.10-10). Findings: Less than significant impact.