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· Perform Feasibility Evaluation of Selected Alternatives <br /> <br />Up to ten concept alternatives will be identified for screening and up to four final alternatives will be <br />selected for final review. The concept alternatives will include a potential 1,000 AFY or Maximum <br />Service Alternative, and a variety other alternatives that serve a subset of the Maximum Service <br />Alternative's customer base. Potential facility improvements will be identified that could expand service <br />beyond Redwood Shores area in the future. Operations reliability and flexibility, potential environmental <br />constraints and public concerns will also be identified. <br /> <br />Subtask 3.1 - Review Existing First Step Recycled Water Distribution Facilities <br /> <br />Consultant will conduct a meeting with City Staff and selected project participants to review the <br />operations of the existing distribution system. Results of this meeting will be used to initiate work under <br />this task. <br /> <br />Subtask 3.2 - Identify and Screen Storage, Pumping and Conveyance Facility <br /> Alternatives <br /> <br />Consultant will identify initial alternatives for screening. City input will be solicited regarding potential <br />pipeline alignments, and sites for storage and pumping facilities. The two screening alternatives for <br />storage are (1) construction of new facilities or (2) utilization of existing aeration tankage at SBSA. The <br />new storage site is understood to be immediately north of the Main Structure on the SBSA site and has <br />been approved by the City in a recent Specific Plan. Storage sizing, construction method and standby <br />connection to potable supply will also be included. Pumping facilities are assumed to be located on <br />SBSA site or the new site for storage. The proposed pipeline alignments and facility sites will be briefly <br />visited (windshield reconnaissance) to assess initial feasibility and cost issues. An Initial Alternatives <br />Summary will be prepared for each screening alternative. Pipelines will be sized using commonly <br />accepted head loss and pressure criteria for recycled water projects. Initial Alternative Summaries will: <br /> <br /> · Show pipeline alignments and facilities sites over aerial photography <br /> <br /> · Present in tabular form a customer list and average and peak demands <br /> <br /> · Identify a matrix non-cost opportunities and constraints <br /> <br /> · Develop conceptual level cost estimates <br /> <br />A half-day Screening Workshop will be conducted with City staff and selected participants to discuss and <br />screen the initial alternatives. The goal of the workshop will be to identify up to four alternatives for final <br />feasibility evaluation. <br /> <br />Subtask 3.3 - Evaluate Feasibility and Cost of Distribution System Alternatives <br /> <br />A complete feasibility evaluation of four alternatives will be provided. The information from the prior <br />task will be further refined through hydraulic modeling additional and assessment work. <br /> <br />Each alternative will be modeled using CYBERNET, EPANET, H2ONET or other software acceptable to <br />the City to confirm that facilities sizing is adequate for pressure and flow requirements. Following an <br />initial model run, the system will be optimized size for both initial service and potential future service <br />conditions. <br /> <br />The feasibility of construction will be further evaluated and refined based upon available existing <br />underground utilities information, observed traffic patterns and pedestrian activity, environmental <br /> <br />u:~les~i active~h2o plaflnin§/kj, recycled/contractscopeofservicesdrafl3a.doc 5 Redwood Shores <br /> Recycled Water Feasibility Study <br /> <br /> <br />