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BACKGROUND On September 6, 2022, the City Council authorized staff to suspend the PFAS Treatment and Wells Rehabilitation Project and to evaluate further water supply alternatives for the portion of water supply currently sourced via the City's groundwater pumping quota (3,500- acre feet/year). On October 18, 2022, the City Council established a new capital improvement project called the Water Supply Alternatives Study, allocating $363,755 from the Water Fund balance to fund a professional services agreement with BC in the amount of$263,755 to perform the technical scope of services, and $100,000 for as-needed legal services associated with the project. The study's objective is to evaluate alternatives relative to the PFAS Treatment and Wells Rehabilitation Project and recommend a preferred path forward (i.e., either continuation of the project or an alternative water supply to produce 3,500-acre feet/year). On February 21 and May 16, 2023, the City Council was provided a progress update on the progress of the study. As of the May update, the remaining work to be completed included evaluating alternatives and recommending the path forward. DISCUSSION To date, BC has collected and reviewed data and information from the City and Zone 7, developed a comprehensive list of water supply alternatives, confirmed a set of evaluation criteria with the Water Supply Alternatives Ad Hoc Subcommittee, and performed initial screening of alternatives. Additionally, in April 2023, BC and City staff met with Zone 7's General Manager and staff to solicit initial feedback on the shortlisted alternatives requiring partnership with Zone 7. This feedback was provided to the ad hoc subcommittee. Following this, the Zone 7 Water Resources Committee provided a recommendation to the Zone 7 Board of Directors toward Zone 7 and the City working collaboratively to explore shared alternatives. The development and evaluation of alternatives have been rigorous, fast-tracked, and focused on the criticality of replacing the loss of 3,500-acre feet of water supply — enough to serve approximately 10,000 homes for a year—with a high-quality, reliable, and cost- effective water source. Because the City had already advanced the PFAS Treatment and Well Rehabilitation Project, this was the "baseline" against which the other viable alternatives were measured. An exhaustive review of options was conducted. A fatal flaws screening asked two questions: 1. "Are there technical or institutional reasons that the option is not feasible?" 2. "Is there a potential for lower cost and or increased benefit compared to the baseline?" It was determined that the following four viable alternatives should advance for more detailed consideration: • Option 1 — Baseline: PFAS Treatment, and Wells 5, 6, and 8 Rehabilitation, includes Centralized Treatment Facility (CTF) at the City's Operations Services Center for all Page 2 of 6