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Executive Summary ES.1 Background In September 2007, CDM Smith Inc. (CDM Smith) completed an Alternative Water Supply Master Plan (AWSMP) for the Indian River County Department of Utility Services (County). The AWSMP was intended to identify various potential sources of raw water to supply a future water treatment plant (WTP) and address the long-term demand for potable water within the County. The ultimate recommendation of the AWSMP was for the County to pursue the development of a surface water source to meet the Tong -term demand deficit. On April 22, 2014, the Board of County Commissioners (BOCC) authorized CDM Smith to perform a feasibility analysis for the siting of a surface water reservoir to meet future, long-term potable water demand. The area of focus for the evaluation was in the vicinity of the North County WTP due to the availability of existing storage and distribution facilities at the WTP, potential availability of large tracts of land that are not yet developed (versus the area surrounding the South County WTP) and proximity to potential withdrawal points. This evaluation also assumes that the proposed surface WTP will be co - located with the North County WTP. Future phases of the project will determine if adequate land is available at or around the existing site; if available land is not sufficient, an alternative WTP site will have to be identified. While a location/area of focus was not specified in the direction given by the BOCC, the most desirable locations meeting these criteria are within the Sebastian River Improvement District (SRID). The development of a long-term alternative surface water supply will require numerous steps to be completed in multiple phases over the planning period. The April 22, 2014 authorization included three proposed phases. Phase 1 (this evaluation) will include initial planning items such as review of the previously completed AWSMP (CDM, 2007), evaluation of the potential site(s), initial sizing of the reservoir and corresponding surface WTP and an evaluation of the land acquisition process. The Phase 1 activities are summarized in the subsequent report sections. The approved work order outlined Phase 2 to then include final site selection, verification of no fatal flaws, detailed surface water hydrologic and hydraulic modeling and land acquisition activities; and Phase 3 to include the detailed design of the reservoir system, transmission piping and treatment process, as well as permitting activities. During the Phase 1 evaluation, additional interim phases were identified and a revised phasing plan was developed for future stages of the proposed project. The updated phasing schedule, as further detailed in ES.4 and 11.2.1, is proposed as follows: • Phase 2 — Modeling to determine available volume of water in canal system; potentially a pilot study; • Phase 3 — Negotiations with the various drainage districts to secure withdrawal permits and pump station/transmission piping ROW; pre -application meetings with regulatory agencies; • Phase 4 — Negotiations with property owners; final site selection; preparation of purchase agreements; ROW agreements for pipelines; • Phase 5 — Detailed design of the reservoir or ASR well system, piping and treatment; final permitting; and Smith PW X _ XM1.6706.104012.03.11 02010 COM Smith Inc. All Rights Reserved ES -1 162