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3-1 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 Section 3 Alternatives Evaluation The process and outcomes of evaluating the four shortlisted alternatives are described in this section, with further detail on assumptions and methodology provided in Appendix A. 3.1 Evaluation Overview The approach for evaluating the four shortlisted alternatives involved a multi-criteria decision support process. In short, the analysis followed three steps: 1.BC and City staff assessed each alternative relative to the Baseline Project using evaluation criteria and weightings confirmed by the Ad Hoc Subcommittee. Evaluation criteria are framed as benefits (i.e., the higher the score, the greater the benefit) and result in a relative benefits score for each alternative. 2.Estimated capital and annual costs were developed for each alternative. 3.Benefits and costs were presented together to facilitate decision making, considering the tradeoffs among alternatives. 3.2 Evaluation Criteria BC and City staff proposed evaluation criteria and weightings that the Ad Hoc Subcommittee reviewed and confirmed at its February 28, 2023, meeting. Definitions of the evaluation criteria and weightings are summarized in Table 3-1. Table 3-1. Evaluation Criteria Definitions and Weightings Criterion Definition Scoring Basis Weighting Water Supply Reliability The ability to predictably, consistently meet water demands, including during dry years. Considers system redundancy and ability to meet demands during peak periods and/or emergency conditions. Able to meet 3,500 AFY demand with either: sufficient system redundancy that is controlled by City, minimal system redundancy that is controlled by City, or minimal system redundancy that is outside the City’s control. 35% Implementation Timing How quickly the alternative can be online, considering timeframe for design, permitting, and construction (if applicable). Implementation in nearer-term (approx. within 1 year), medium-term (approx. 1 to 2 years), or longer-term (approx. 2 to 3 years).25% Water Quality/Regulatory Compliance Degree of ability to deliver water below all current and anticipated future state and federal drinking water standards. Water quality standards are met and either have flexibility to also meet more-stringent future regulations or little flexibility to meet more-stringent future regulations. Otherwise, unknown current or future risk of long-term contamination, or known risk of near-term contamination. 15%