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Joint Tri-Valley Potable Reuse Technical Feasibility Study 1 ES 1 TRI-VALLEY WATER AGENCIES Recommendations/Next Steps If the partnering agencies wish to continue pursuing potable reuse,there are a number of technical efforts necessary.In the near-term,to narrow the best end use option,further studies and other efforts are needed to evaluate the best candidates for siting injection wells;to characterize the potential for contaminant mobilization in the groundwater basin using models and field test;and to determine the ability of the COL to receive,store,and recharge purified water in conjunction with other potential uses of the COL. A broader effort refining regional demand projections would also help determine the need for the various water supply options available to the Tri-Valley—including potable reuse—and the target yield for those options.To place potable reuse in the context of other water supply options,the 2016 WSE update should be updated to reflect the findings from this study as well as new data and options that have developed since 2016. Figure ES.7 presents the potential next steps in a conceptual flowchart.The tasks,timing,and preliminary consulting cost estimates are presented in Table ES.2.Finally,a conceptual timeline for next steps is presented in Figure ES.8. While this study focused on technical issues,there are also major institutional and public outreach components to potable reuse implementation that would need to be addressed. c ca" ",,v FINAL MAY 2018'; 9