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THE CITY OF 19 ••.••I CITY COUNCIL AGENDA REPORT pL•EASANTON. May 15, 2018 Operations Services TITLE: PRESENTATION ON THE JOINT TRI-VALLEY POTABLE REUSE TECHNICAL FEASIBILITY STUDY SUMMARY The Joint Tri-Valley Potable Reuse Technical Study is a City Council work plan item. The goal of this study is to evaluate the technical options for potable reuse as a possible strategy for diversification of the region's water supply and having a more reliable source of water during periods of extreme drought and/or other existing water supply limitations. This presentation is designed to provide the City Council with an update of the work performed to date, identify possible next steps for further exploration of potable reuse in partnership with regional agencies, and to solicit feedback from the City Council regarding continued participation in this regional effort. On October 4, 2016, City Council authorized the City Manager to initiate a Task Order with Carollo Engineers under the Tri-Valley Intergovernmental Reciprocal Services Master Agreement to perform the Joint Tri-Valley Potable Reuse Technical Feasibility Study (Study). The Study was requested by the Tri-Valley Water Liaison Committee to explore diversification of the water supply portfolio in the Tri-Valley and enhance long- term water supply reliability. Councilmembers Brown and Narum currently represent the City on this Committee; staff representation includes the City Manager and Director of Operations and Water Utilities. The Study is now complete and finds that potable reuse is technically feasible. In a bookend approach, six alternative projects were evaluated with a varying water yield of 5,500 to 10,000 acre-feet per year. The capital and operating cost ranges for these alternatives are $2,200 to $2,500 per acre-foot. At buildout, these costs may add $10 to $15 per month on the average water bill. The Study also conceptually outlines next steps. It's important to note that continuation in the next steps does not obligate the City to participate in the support or deployment of a potable reuse system. Rather, it ensures that additional technical investigation of potable reuse options are completed and further evaluates how potable reuse improves regional water supply reliability compared to other supply options.