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Table 6-3: Zone 7 Projected Water Demands (AFA)
<br />Treated Water Purchasers
<br />Projected Demands
<br />2010
<br />2015
<br />2020
<br />2025
<br />2030
<br />City of Livermore
<br />7,620
<br />9,400
<br />9,900
<br />10,200
<br />10,200
<br />City of Pleasanton
<br />18,320
<br />21,800
<br />22,700
<br />23,400
<br />23,400
<br />CWSC
<br />10,320
<br />12,600
<br />13,200
<br />13,650
<br />13,700
<br />DSRSD
<br />12,820
<br />12,100
<br />12,900
<br />13,250
<br />13,320
<br />Other Customers
<br />290
<br />340
<br />410
<br />460
<br />500
<br />Total of Potable Water Sales
<br />49,370
<br />58,240
<br />59,110
<br />60,960
<br />61,120
<br />Agricultural Areas
<br />8,250
<br />8,250
<br />8,250
<br />8,250
<br />8,250
<br />Total Water Sales'
<br />57,620
<br />64,490
<br />67,360
<br />69,210
<br />69,370
<br />Operational Demands
<br />Artificial recharge of Main Basin
<br />15,000
<br />20,000
<br />20,000
<br />25,000
<br />30,000
<br />Surplus water to STWSD
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />5,000
<br />Total Operational Demands
<br />20,000
<br />25,000
<br />25,000
<br />30,000
<br />35,000
<br />Total Demands
<br />77,620
<br />89,490
<br />92,360
<br />99,210
<br />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. Zorn 7.
<br />c. Estimated surplus imported water conveyed to Semitropic Water Storage District for Out-of -Basin groundwater banking.
<br />d. Projected sum of ate water demands for Zone 7 Water Agency.
<br />Source: PBS&J/EIP, October 2007 adapted from Zone 7 Water Agency Urban Wake Management Plan Table 8: Water Demand Purchase Projections,
<br />Page 35.
<br />Table 6 -2: Livermore- Amador Valley Population Projections
<br />Years
<br />2008
<br />2009
<br />2010
<br />2015
<br />2020
<br />2025
<br />2030
<br />Population'
<br />214,284
<br />219,766
<br />225,012
<br />248,896
<br />255,397
<br />262,938
<br />263,779
<br />Notes:
<br />a. Population estimates are consistent with 2005 Zone 7 Urban Water Management Plan, Table 1, page 11.
<br />Source: Zone 7 Water Agency 2005 Table 1 of Annual Review of Sustainable Water Supply July Update, August 17, 2005.
<br />City of Pleasanton
<br />Final Water Supply Assessment
<br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project
<br />5.0 Demands
<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 2 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 Califomia Water Service Company). Zone
<br />7 Water Agency 2005 Urban Water Management Plan, page 27.
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<br />6 -2
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