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Table 6-3: Zone 7 Projected Water Demands (AFA)
<br /> Pro'ected Demands
<br />Treated Water Purchasers 2010 2015 2020 2025 2030
<br />Ci of Livermore 7,620 9,400 9,900 10,200 10,200
<br />Ci of Pleasanton 18,320 21,800 22,700 23,400 23,400
<br />CWSC 10,320 12,600 13,200 13,650 13,700
<br />DSRSD 12,820 12,100 12,900 13,250 13,320
<br />Other Customers 290 340 410 460 500
<br />Total of Potable Water Sales 49,370 56,240 59,110 60,960 61,120
<br />A ricultural Areas 8,250 8,250 8,250 8,250 8,250
<br />Total Water Sales 57,620 64,490 67,360 69,210 69,370
<br />O erational Demands
<br />Artificial rechar a of Main Basin 15,000 20,000 20,000 25,000 30,000
<br />Sur lus water to STWSD 5,000 5,000 5,000 5,000 5,000
<br />Total O erational Demands 20,000 25,000 25,000 30,000 35,000
<br />Total Demands 77,620 89,490 92,360 99,210 104,370
<br />Notes:
<br />a. Potable and Untreated Water Sales.
<br />b. Estimated surplus imported water used to offset Zone 7 groundwater extractions from the Main Basin assuming that groundwater pumping averages
<br />15,000 - 20,000 AFA. Zone 7.
<br />c. Estimated surplus imported water conveyed to Semitropic Water Storage District for Out-of-Basin groundwater banking.
<br />d. Projected sum of all water demands for Zone 7 Water Agency.
<br />Source: PBS&J/EIP, October 2007 adapted from Zone 7 Water Agency Urban Water Management Plan Table 8: Water Demand Purchase Projections,
<br />a e 35.
<br />6.1.1.2. Projected Single Dry-Year and Multiple Dry-Year
<br />Demands
<br />In dry years, according to Zone 7's UWMP it is anticipated that system demands would not change
<br />unless retailers and consumers were asked to conserve; therefore, Zone 7 assumes demands will
<br />not be reduced in dry or multiple-dry year scenarios. However, in 1992, at the end of the 1987-1992
<br />droughts, conservation measures were requested. In that case, conservation measures in the Tri-
<br />Valley area achieved nearly 20 percent savings when SWP deliveries were reduced.29 Dry-year and
<br />multiple dry-year demands are anticipated to be approximately 64,490 AF in 2015 and up to 69,370
<br />AF in 2030 as shown in Table 6-3. Since then, assuming demands remain at normal-precipitation
<br />levels or without water conservation measures Zone 7 developed a water supply portfolio in a
<br />manner that offers greater flexibility across a variety of water resources. As previously noted, basin-
<br />wide groundwater demands may increase temporarily during periods of SWP curtailments when
<br />Zone 7 would pump more groundwater to serve retail customers. The GPQ for each municipality
<br />(Pleasanton, DSRSD and CWSC) limits their pumping to the certain amounts without incurring
<br />replenishment fees. Because of this potential for short-term increases in groundwater demand,
<br />Zone 7 will continually adhere to goals and objectives of the GMP.
<br />29 The demand reductions achieved during the most recent drought of 1987 -1992 had significant reductions [20
<br />percent in the City of Pleasanton] through the combined efforts of Zone 7 and its four retail water suppliers (Dublin-
<br />San Ramon Services District, City of Livermore, City of Pleasanton and California Water Service Company). Zone
<br />7 Water Agency 2005 Urban Water Management Plan, page 27.
<br />P:\Projects - WP OnIy441162.01 Staples Ranch WSA\FinahFinal WSA.doc 6-2
<br />City of Pleasanton 5.0 Demands
<br />Final Water Supply Assessment
<br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project
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