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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 184 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx service pressures would remain above the City’s minimum standards and that required fire flows could be met while maintaining acceptable pressures and pipeline velocities. Additionally, the proposed improvements would not result in pump station impacts and would not require additional off-site water system improvements beyond those identified as part of the proposed project and the shared East Pleasanton pipeline connection. These findings are consistent with the City’s Water Distribution System Capacity Master Plan which establishes systemwide criteria for water supply, distribution, and fire flow performance. Accordingly, the City has adequate water distribution capacity to serve the proposed project, and the proposed project would not require construction of new or expanded water supply, storage, or distribution facilities beyond those already planned and evaluated. Thus, as described in Impact UTIL-b, the City would have adequate water supplies available to accommodate the proposed project. Wastewater Wastewater services would be provided to the proposed project by the City. The City owns and operates sanitary sewer lines and conveys wastewater throughout the City to the DSRSD regional WWTP. Through a contract agreement with the City, DSRSD provides wastewater treatment services to the City. The proposed project would include a connection to an existing off-site 8-inch diameter sewer line on Mohr Avenue, northwest of the project site. Similar to the proposed water and stormwater lines contemplated in the County Project, the proposed project would construct a new 8-inch diameter sewer line extending from the northwest corner of the project site, following the existing utility road, to Mohr Avenue to access the existing sewer line (Exhibit 9c). Sanitary sewer service throughout the project site would be provided in 8-inch diameter sanitary sewer lines under the proposed internal streets. With respect to wastewater conveyance capacity, the City commissioned a Technical Memorandum by Woodard & Curran (dated November 12, 2025, included as Appendix E), to evaluate the existing network under several scenarios, including the addition of four future planned projects, and to identify improvements that could be funded by future development thus ensuring adequate capacity of downstream sewer lines exist to accommodate planned growth. The four projects evaluated in the Technical Memorandum include: Villages at the Quarry (Kiewit); Arroyo Lago; East Lakes; and Amazon. The Technical Memorandum identifies several Capital Improvement Program (CIP) strategies and associated pro rata costs to be assumed by the proposed project and future development to ensure adequacy of the system to accommodate future flows under dry and wet weather scenarios. The proposed project would include construction of needed downstream sewer improvements according to the Technical Memorandum and would seek reimbursement as appropriate from future development according to the pro rata share methodology. The proposed project would also contribute funding for future water and wastewater infrastructure through payment of applicable City development impact fees, which are intended to support planned facilities operated by DSRSD.