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Joint Tri-Valley Potable Reuse Technical Feasibility Study I ESI TRI-VALLEY WATER AGENCIES <br /> Table ES.2 Potential Next Steps:Tasks,Timing,and Preliminary Consultant Costs <br /> Step Description l Timing PRELIMINARY <br /> I Consultant Cost' <br /> How Does Potable Reuse Improve Regional Water Supply Reliability vs.Other Supply Options? <br /> This study would apply a <br /> consistent land-use based <br /> method to the region that <br /> Regions!Water accounts for the state's long- <br /> Demand Study term conservation framework. 6-9 months S200,000-300,000 <br /> This will help determine the <br /> amount of additional water <br /> supply needed and timing for <br /> the Tri-Valley. <br /> Zone 7's water system was built <br /> primarily as a surface-water <br /> based system,with <br /> groundwater used for daily and <br /> seasonal peaking and <br /> emergencies/droughts.This <br /> study would evaluate the <br /> Zone 7 potential shift to greater <br /> groundwater use if groundwater <br /> Conjunctive Use recharge is increased 4-6 months 5100,000-5150,000 <br /> Study significantly(e.g.,if potable <br /> reuse via groundwater <br /> augmentation is implemented). <br /> Impacts on the transmission, <br /> treatment plant,and well <br /> facilities will be evaluated,as <br /> well as on salt management and <br /> delivered water quality. <br /> Zone 7 will incorporate new <br /> data and new supplies since the <br /> Zone 7 Water 2016 WSE Update(e.g.,timing <br /> Supply and yield of CA WaterFix,Sites 4-6 months Zone 7 <br /> Evaluation Reservoir,results of potable <br /> Update reuse study).Data from the <br /> conjunctive use study would <br /> also be incorporated.This will <br /> 'To be refined when scope has been defined in more detail. <br /> C Ca,rso,.U,1- FINAL I MAY 20181 11 <br />