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11 ATTACHMENTS 1-3
City of Pleasanton
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CITY CLERK
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2021
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020221
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11 ATTACHMENTS 1-3
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1/27/2021 1:49:04 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
2/2/2021
DESTRUCT DATE
15Y
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Joint Tri-Valley Potable Reuse Technical Feasibility Study I ESI TRI-VALLEY WATER AGENCIES <br /> r.,Lay cb.>'rrrr A <br /> -`k 1.. <br /> Stacktor. <br /> r. <br /> as <br /> �UAW,' <br /> A• <br /> 7A• <br /> :1tN <br /> r <br /> mo <br /> Des <br /> Zane>s..,b.Arm tars hair <br /> Qw..Un loom sats 0.W <br /> Mtir sorvc.0.0 <br /> Qty or wumo..+war sorra ,. <br /> tip of w....rrn Mar Sera. oq y(K (''want}. <br /> V CGMa+w New Soma coat.* S n .'. ,_ xnwndwatrr hunky <br /> Figure ES.1 Tn-Valley Water Agencies and Service Areas <br /> Range of Water Supply Yield <br /> The 2016 WSE Update evaluated a number of water supply portfolios including a combination of <br /> the following potential new supplies:California WaterFix,desalination,and potable reuse.Los <br /> Vaqueros was also included as a potential new storage location.Desalination and potable reuse <br /> were assumed to have yields of 5,600 acre-feet per year(AFY)and 7,800 AFY,respectively.For <br /> the purposes of this study,an upper bookend of 10,000 AFY was assumed for potable reuse, <br /> which was also consistent with projected wastewater availability,as discussed further below.A <br /> lower bookend of 5,500 AFY was used. <br /> Existing Facilities and Regulations <br /> Zone 7 supplies water to the Tri-Valley using raw imported water(State Water Project),local <br /> water(Arroyo Valle),and groundwater.Raw water is treated at either the Patterson Pass Water <br /> Treatment Plant(PPWTP)or the Del Valle Water Treatment Plant(DVWTP)before distribution <br /> (locations shown in Figure ES.2).Zone 7's wells are primarily located in the western portion of <br /> the service area.Some groundwater in the Mocho Wellfield area with high total dissolved solids <br /> (TDS)is treated through a demineralization plant before distribution.Additional Zone 7 water <br /> facilities include the Chain of Lakes(COL),a series of existing or former gravel quarries that are <br /> in the process of reclamation or have been reclaimed as water storage and/or recharge lakes <br /> (Figure ES.2).Zone 7 currently owns Cope Lake and Lake I,with the rest of the ten lakes due to <br /> be transferred to Zone 7 in the future.Lake H is expected to be transferred for Zone 7's use over <br /> the next few years.Zone 7 will use the COL for a variety of water resource management <br /> activities. <br /> C FINAL I MAY 2018 3 <br />
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