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• Operation Complexity — ease of operating and maintaining the system from a technical standpoint, considering organizational readiness and necessary staff qualifications/certifications, and the ability to enhance the system in the event of additional and or more stringent drinking water regulations. Weighting 15% • Institutional Complexity - Ease of implementation and management from an institutional standpoint (e.g., willingness of external partners, complexity of agreements and administration). Weighting 10% The resulting combination of the project cost (Capital, O&M plus system improvements unique to each option) and the relative benefit scores after applying the criteria developed, as outlined in Attachment 1, illustrate how the four options compare on a total cost/total benefits basis. The option that best meets the City's need for safe, reliable drinking water into the foreseeable future is Option 3 (two new groundwater wells) which provides the lowest cost option at nearly half the price of the baseline project while also being one of the highest benefit alternatives. Two new groundwater wells outside of the influence of PFAS will achieve a high-quality, reliable, and cost-effective water supply option to replace the 3,500-acre feet of loss due to PFAS. The baseline (Option 1) has a slightly higher level of benefits but is twice the cost. Two new groundwater wells located outside of the influence of PFAS provide the City's most beneficial and least-cost option to achieve a high quality, reliable, and cost-effective water supply option to replace the 3,500-acre feet of loss due to PFAS over the next 20 years. The baseline (Option 1) has a slightly higher level of benefits but is twice the cost. The reduced baseline (Option 2) is a marginally lower cost but substantially fewer benefits. Notably, any PFAS treatment option requires competency in treating water, a skill set the City does not currently possess. The Zone 7 purchase option (Option 4) is the costliest option because the ongoing cost of the water purchases is about three times the unit cost of the capital required to develop two new wells to extract the City's groundwater quota. The Zone 7 cost of service accounts for all aspects of water management for the region (including addressing the regional PFAS issue) which goes beyond groundwater extraction costs alone. It should be noted that the recommendation of two new wells outside of the PFAS influence rather than treating the PFAS contamination does not deter the City from the efforts to ensure this vital water source for the city and region is protected for future generations, and that proactively addressing the existing pollution continues to be a priority. Zone 7's PFAS management strategy of monitoring, blending, treating, managing, and diversifying is consistent with others in the water industry. The City will continue to work on this issue, supporting Zone 7's role as the overseer of the groundwater basin. NEXT STEPS Concurrent with performing the water supply alternatives analysis, staff coordinated with Zone 7 on its groundwater modeling and capacity planning efforts. One of the first activities for implementing two new wells is receiving assistance from Zone 7 with siting and sizing the new City well capacity. Zone 7 is currently in the process of updating its groundwater model to Page 4 of 6