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Additionally, in April 2023, BC and City Staff met with Zone 7's 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 Subcommittee recommended the Zone 7 Board of Directors toward Zone 7 and the City working collaboratively to explore these shared alternatives. On September 20, 2023, the Zone 7 Board unanimously approved accelerating a project to upgrade its groundwater model, which will assist the City in siting the new wells and inform a discussion about jointly developing a project to meet both agencies' needs which could result in cost efficiencies for the City and Zone 7. The groundwater model is scheduled to be updated by the end of Fiscal Year 2023/24, enabling Zone 7 and the City to evaluate new wells. 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 Rehab 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 primary questions: 1. "Are there technical or institutional reasons the option is not feasible?" 2. "Is there a potential for lower cost and or increased benefit compared to the baseline?" It was determined 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 Operations Services Center (OSC) for all three wells, Well 8 rehab to restore its pumping capacity, and interconnecting pipelines for Wells 9 and 10 that replaces Wells 5 & 6 to the CTF • Option 2 — Reduced Baseline, PFAS Treatment for Well 8 only, includes CTF treatment at OSC, and Well 8 rehabilitations to restore pumping capacity • Option 3 — Two New City Wells (West of PFAS plume), located within the Bernal subbasin and with sufficient capacity to reliably deliver the City's full groundwater quota annually • Option 4 — 100 percent purchases from Zone 7, including annually purchasing the full groundwater quota amount from Zone 7 and paying the applicable Zone 7 water rates associated with these deliveries. To clarify, the City is assumed to forego pumping its groundwater quota (without waiving such rights), and the foregone groundwater would presumably be pumped by Zone 7. It may be necessary for Zone 7 to add facilities or incur costs to perform these services that are not included in this analysis. Page 3 of 8