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Section 3: Alternatives Evaluation Water Supply Alternatives Study 3-5 DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. Water Supply Alternatives Study-Draft Report.docx Estimated capital, O&M, and total annual costs are summarized in Table 3-2. Table 3-2. Estimated Costs by Alternative Cost Metric Alternative 1 (Baseline, PFAS Treatment, 50% design) Alternative 2 (Reduced Baseline, PFAS treatment, 50% design) Alternative 3 (Two New City Wells, 2% design) Alternative 4 (100% Purchases from Zone 7, 2% design) Capitala, b $65M $29M $23M $11M (Range)($57M-$77M)($26M-$34M)($13M-$42M)($6M-$21M) Annual O&Mc, d $1.3M/year $0.6M/year $0.5M/year $6.5M/year (Range)($1M-$1.5M/year)($0.5M-$0.7M/year)($6.3M-$6.7M/year) Total Annual Coste $5.5M/year $2.5M/year $2.0M/year $7.2M/year Costs shown in estimated 2024 $ (assuming 5% escalation from 2023 $). a. Includes design, construction, contingency, construction support services (construction management [CM] and engineering services during construction [ESDC]), and incremental cost of required infrastructure improvements beyond those identified in footnote (b). Required infrastructure improvements are identified for each alternative in Akel’s Water Supply Alternative Improvements summary dated August 2, 2023 (Appendix E). b. Assumes near-term improvements (including pipelines F-1, F-4, and F-5 and baseline booster station BS-1 as identified in Akel’s Water Supply Alternative Improvements summary dated August 2, 2023; Appendix E), estimated at ~$10.2M, will be funded and addressed in advance of implementing water supply alternatives. c. Includes granular activated carbon (GAC) media change-out, hazardous disposal of GAC spent media, chemical (additional costs), electricity (additional costs), and wholesale water supply (assuming 3,500 AFY) d. Not including additional operations staff for PFAS treatment (estimated at 2 to 3 full-time equivalents for Alternatives 1 and 2) e. Includes capital and O&M. Capital cost annualized using a 5% interest rate over a 30-year period. 3.3.3 Combined Benefits and Costs Figure 3-5 shows the results of combining the relative benefit scores and estimated project costs for each alternative. Optimal results are closest to the top-left corner of the chart, where the relative benefit is highest and estimated project cost is lowest. Figure 3-5. Benefit score and estimated annual cost for each alternative Annual cost includes capital and O&M. Capital cost annualized using a 5% interest rate over a 30-year period. *Zone 7’s wholesale rate will likely increase over time with development of new supplies.