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Technical Next Steps The Study determined that potable reuse was technically feasible, but also brought to light a number of technical challenges and questions that need to be answered if potable reuse is to be further pursued. Therefore, as part of the Study, a conceptual outline of technical next steps was prepared and is included in the Executive Summary. These technical next steps can be split into two main categories; water supply options and further technical efforts that can occur concurrently if desired. The first category is a broader effort to place potable reuse in the context of other water supply options in terms of yield, cost, reliability, and other metrics. Recommended next steps are 1) conduct a regional water demand study to refine regional water demand projections and establish a target yield for the various water supply options and 2) support an update to Zone 7's 2016 Water Supply Evaluation to reflect the findings from this Study as well as new data from other water supply options that have developed since 2016. The regional consulting costs for these next steps are estimated to be just under $500,000 and have an implementation time frame of under a year. The second category of next steps involves further technical efforts to advance development of a potable reuse project. The short-term efforts (1 — 2 years) would focus on narrowing potable reuse alternatives based on determining the best end use option. The regional consulting costs for these next steps are estimated to be just under $1 million. For each option, costs would be shared/apportioned among Tri-Valley Water Agencies. If City Council is interested in further exploring a potable reuse project, the conceptual next steps and costs will be further defined in coordination with a Tri-Valley Water Liaison Committee meeting to be held in the summer. Recommended next steps, including cost sharing between the Tri-Valley Water Agencies, would be presented to City Council at a subsequent City Council Meeting. Community Survey on Potable Reuse In January 2018, a community survey on Tri-Valley water supply and reliability to determine level of understanding and support for potable reuse was conducted as a follow up to the November 2015 community survey. Since the previous survey was conducted during the drought and community attitudes may be changing, staff determined a new survey was warranted. The survey results found that over the last few years, voters have become more concerned about water quality and water rates. Of those that oppose using purified recycled water, cost increases and concerns over the safety of the water were the main reasons given. A very slight majority of respondents support supplementing existing water supplies with purified recycled water. Of those, the majority would support a $5 monthly increase in their water bills, or a 5% increase. Further details on the survey results will be presented at this City Council Meeting. Page 5 of 6