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Section 3: Alternatives Evaluation Water Supply Alternatives Study <br />3-3 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. <br />Water Supply Alternatives Study-Draft Report.docx <br />3.3.2 Costs <br />The accuracy level of capital costs varies based on the maturity level of a project’s design, as <br />depicted in Figure 3-2. Because the City had progressed the PFAS Treatment Project through 50 <br />percent design, capital costs for Alternative 1 (Baseline Project) and Alternative 2 (Reduced <br />Baseline) are estimated at a level consistent with Association for the Advancement of Cost <br />Engineering’s (AACE) definition of Class 2, which has an accuracy level of -15 percent to +20 <br />percent. In contrast, Alternative 3 (Two New City Wells) and Alternative 4 (100% Purchases from <br />Zone 7) are planning-level costs, consistent with AACE’s definition of Class 5 estimates for screening <br />conceptual projects, which has an accuracy level of -50 percent to +100 percent. <br />Figure 3-2. Capital cost estimating accuracy improves as the level of project definition improves <br />Figure 3-3 shows the estimated capital costs of each alternative with its respective accuracy range. <br />Information about the items included in capital costs for each alternative are provided in Appendix B.