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FINAL DRAFT PRELIMINARY REPORT <br />(Connections to EOCF #2) <br />Table 8.1 Study Results Summary <br />Available 60 day Supply <br />Planning Level Estimate <br />Scenarios <br />to SOC <br />of Construction Cost <br />Target Year of Operation <br />2020 (supply declining <br />1— Existing w/ VFD Imp. <br />28.9 cfs avg. <br />$800K <br />until after additional <br />improvements are made) <br />2 — Future w/VFD, 4 new <br />15 cfs avg <br />$136M <br />2026+ <br />wells, Treatment <br />3 — Future w/VFD, 4 new <br />wells, Treatment, <br />23.1 cfs avg <br />$156M <br />2026+ <br />Pipelines <br />4a — EOCF#2/DRWF <br />23.1 cfs (constant supply) <br />$144M <br />2026+ <br />Su I Treatment <br />p p y, <br />4b — EOCF#2/Other GW <br />23.1 cfs (constant supply) <br />$48M <br />2026+ <br />supply <br />8.2 New Local Water Supply Integration Utilizing the East Orange County Feeder No. 2 <br />Municipal Water District of Orange County (MWDOC) is currently supporting development of several potential <br />new water supply projects, including ocean desalination from Huntington Beach Desalination Plant (HBDP); <br />ground water pump back; and ocean desalination from Doheny Desalination Plant (DDP). If implemented, these <br />new supplies will enhance water supply reliability for the region by providing locally controlled sources of supply <br />that have less risk of interruption. It is envisioned that water from these sources will be conveyed to MWDOC <br />Member Agencies and other retail agencies in Orange County through a combination of new and existing <br />conveyance facilities. <br />To establish a work plan for addressing both physical infrastructure needs and impacts of water quality <br />differences, MWDOC had several White Papers prepared to address these topics. Black & Veatch prepared a <br />White Paper titled "MWDOC New Local Water Supply Integration into the Metropolitan Water District System <br />Utilizing the East Orange County Feeder No. 2" dated October 2019. This White Paper focuses on the <br />integration issues associated with the HBDP and the groundwater pump back concepts with a particular focus on <br />the concept of utilizing the EOCF#2 as a means of introducing these supply sources into the Orange County <br />Distribution System. <br />The Groundwater Pump Back will comprise of installation of new groundwater wells or use of existing wells in <br />the OC basin that are located near the southern end of the EOCF#2. The OC Water Reliability Study included a <br />concept involving installation of three groups of new wells with a capacity of approximately 10 mgd. Under <br />normal conditions, it is envisioned that these new groundwater production wells would be used to deliver water <br />directly to retail water agencies in their vicinity. Under drought or emergency conditions, these wells would be <br />called on to deliver water into the EOCF#2 to augment imported supplies. <br />The White Paper summarized the various recommendations to address the outstanding issues of using the <br />EOCF#2 as a means of introducing these new water supplies into the OC Distribution System. <br />Orange 9t9%9 1District/Moulton Niguel Water District 30 — 30 5/17/2tIMA TECH <br />Evaluation of Groundwater Conveyance Options 18 <br />