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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 186 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx proposed project would be served by existing utility lines on the north side of the project site and along Busch Road. Both power lines are currently located above ground but would be moved underground as part of the proposed project. As such, the proposed project would not require relocation or construction of new or expanded electric power, natural gas, or telecommunications facilities beyond what is proposed under the proposed project. Conclusion In summary, consistent with the impact conclusions in the Prior FEIR, impacts related to the need for relocation or construction of new or expanded water, wastewater treatment, stormwater drainage, electric power, natural gas, or telecommunications facilities would be less than significant. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required. b) Water Supply Would the project: Have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? Prior FEIR Conclusions The Prior FEIR found that the County Project would receive water supply from Cal Water through its Livermore District. Approximately 70 percent of the Livermore District’s water is purchased from Zone 7, with the remaining 30 percent coming from groundwater. The Livermore District 2020 UWMP concluded that Zone 7 could meet all its obligations to provide adequate water supplies for the Livermore District on average in normal year, single dry year, and multiple dry years.58 The County Project would construct approximately 400,000 gallons of water storage, including 360,000 gallons intended for fire use and 20,046 gallons intended for emergency water storage. Further, based on the Livermore District UWMP, it was found that it would be able to fully serve its service area (existing and future users), including the County Project, in normal, single dry, and all multi-year drought scenarios. The project-specific Water Supply Evaluation (WSE) determined that there would be adequate water supplies to meet the demands of the County Project in normal, single dry, and multiple dry years through 2045. Therefore, the Prior FEIR concluded that impacts would be less than significant. (Draft EIR, pp. 3.17-1, 6-22–6.24). Proposed Project Analysis and Conclusion Rather than being served potable water by Cal Water through its Livermore District, water supply would be provided to the project site by the City. The City receives 100 percent of its water from Zone 7.59 While the City previously obtained a portion of its supply from City-owned groundwater wells, those wells are no longer in operation. The City is actively evaluating future supply alternatives, 58 California Water Service (Cal Water). 2021. 2020 Urban Water Management Plan. June. 59 City of Pleasanton. 2026. About our Water. Website: https://www.cityofpleasantonca.gov/our-government/pleasanton- water/about-our-water/. Accessed March 10, 2026.