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REGIONAL GROUNDWATER FACILITIES PROJECT <br />FEASIBILITY STUDY <br /> <br /> ES-2 Zone 7 Water Agency <br />December, 2025 <br /> <br />Through comparative assessment of the project alternatives against project alternative evaluation criteria <br />(yield, groundwater sustainability, water quality, operational flexibility, cost, and other criteria) the Study <br />concludes that Project Alternative #2 (Tennis and Hansen Park) offers the most balanced and <br />implementable solution. This configuration, involving construction of two new production wells, raw <br />water transmission pipeline to the Hopyard Chloramine Facility (HCF), and HCF upgrades, can meet both <br />agencies’ objectives under drought-year conditions with realistic operating schedules, while minimizing <br />exposure to PFAS risks and avoiding excessive infrastructure and operations and maintenance (O&M) <br />costs and operational complexity. It is important to note that the estimated well production capacities <br />and resulting annual project yield estimates associated with the selected alternative in this Study are <br />preliminary and based on test well performance data. These estimates will be refined and confirmed <br />through installation and testing of the full-scale production wells as the project advances into final design <br />and implementation. <br />Carollo Engineers has prepared a Basis of Design Report (BODR), 10 percent design drawings and <br />engineer’s opinion of probable construction capital costs and O&M for the preferred project alternative <br />identified in this Study (see Appendix J). Together, this Study, the attached BODR and probable <br />construction capital and O&M costs are intended to provide Zone 7 and the City governing bodies with <br />the required information needed to confirm whether the joint project is agreeable to proceed over <br />individual water supply projects.