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TRI-VALLEY WATER AGENCIES I ESI Joint Tri-Valley Potable Reuse Technical Feasibility Study issue in the treatment train upstream.This treatment train,called FAT+,when combined with the downstream WTPs,greatly exceeds expected regulatory goals. Alternative Development Method Due to the numerous possibilities of potable reuse projects,with various source water,treatment locations,and end uses,a step-wise decision process was used to evaluate the potential Tri- Valley potable reuse projects,as is shown in Figure ES.4.At key stages in the selection process, workshops with representatives from all project participants were convened to facilitate key decisions.The effort was designed to develop a"book-end"of options to be considered with the end goals of improving water supply reliability,protecting water quality,and being fiscally responsible. World of Alternatives End Treatment Use Sources NCI l� Alternatives Tr, 'a' luaid scr, Further u_ Alternatives ' Analysis ■ii'� .0 •1 ' 00 Figure ES.4 Alternative Development Process Evaluation Criteria The following evaluation criteria were used in the screening of project alternatives: • Yield(measured by acre-feet per year-AFY). • Cost(Capital and Operations&Maintenance(O&M)). • Improved Supply Reliability • Improved Delivered Water Quality • Improved Groundwater Basin Quality • Clear Regulatory Pathway • Minimizes Neighborhood Impacts • Ability to Phase the Project • Operational Flexibility • Ease of Construction Alternatives Development Alternatives were developed by combining source of water,treatment locations,and different end uses as discussed below. Source Water and Potential Yield There are two sources of water for the purified water projects, LWRP and DSRSD WWTP.These two WWTPs have existing non-potable recycled water programs.These programs limit the