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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 45 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480022/FOF/21480022 Pleasanton Housing Element FOF.docx recycled tertiary treated wastewater could be used without negatively impacting groundwater. Proposed Housing Element Program 4.4 requires the City to assess and plan for adequate water supply, including completion of groundwater treatment improvements to address known contaminants in City-operated wells. The Municipal Code contains rules and regulations to maximize infiltration and rainwater retention and minimize impacts to groundwater recharge. Section 9.30.060 (Stages for reduction in water use) provides both voluntary and mandatory water conservation stages to minimize the effect of a shortage of water on the City’s customers and significantly reduce the consumption of water over an extended period of time, which directly impacts groundwater supplies. (Draft Program EIR, Page 3.9-29–30). Potential Effect Impact HYD-3: Development consistent with the Housing Element Update, rezonings, and General and Specific Plan Amendments would not 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: i) Result in substantial erosion or siltation on- or off-site; ii) Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site; iii) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater systems or provide substantial additional sources of polluted runoff; iv) Impeded or redirect flood flows (Draft Program EIR, Page 3.9-31). Findings: Less than significant impact. Facts in Support of Findings: Erosion and Siltation: Construction activities at the site that would disturb one or more acres of land surface are subject to the Construction General Permit adopted by the State Water Board. Compliance with the permit requires each qualifying development project to file an NOI with the State Water Board. Permit conditions require development of a SWPPP. Inspection of construction sites before and after storms is also required to identify stormwater discharge from the construction activity and to identify and implement erosion controls, where necessary. Because these provisions are more stringent than those included in the Vineyard Avenue Corridor Specific Plan, they would ensure that development on Site 27 (PUSD-Vineyard) would be consistent with the “Water Quality and Protection Requirements Relating to Construction” included in the Vineyard Avenue Corridor Specific Plan. The General Plan includes policies and actions that promote the prevention of erosion and siltation. Water Element Program 2.2 requires compliance with Zone 7 policies regarding the restoration of riparian corridors when flood and erosion control activities require channelization. Program 2.3 directs the utilization of habitat preservation and reclamation measures when designing flood and erosion control projects to limit impacts on plants and wildlife. Further, Program 11.8 requires construction site field inspections to ensure proper erosion prevention and materials/waste management implementation to effectively prohibit non-stormwater discharges.