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City of Pleasanton 6.0 Supply Demand Comparison
<br />Final Water Supply Assessment
<br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project
<br />Table 7-5: City of Pleasanton Normal/Average Year Supply and Demand Comparison (AFA)
<br /> Pro acted Demands
<br />Treated Water Purchase Re uest 2010 2015 2020 2025 2030
<br />Purchased from Zone 7 18,320 21,800 22,700 23,400 23,400
<br />Ci Groundwater GPQ 3,500 3,500 3,500 3,500 3,500
<br />Total Water Delivered 21,820 25,300 26,200 26,900 26,900
<br />Estimated Demands 21,282 22,403 22,403 22,403 22,403
<br />Notes:
<br />a: Demand estimated at 19.0 mgd (21,282 AFA) in 2010 prior to buildout in 2025.
<br />b: Average Day Demands of approximately 20 mgd with natural conservation after buildout in 2025.
<br />Source: Table 3-2 Baseline Water Pro action, 2002 Ci of Pleasanton Urban Water Mana ement Plan, a e 3-8.
<br />As stated in the UWMP and shown in Table 7-5, Pleasanton, in accordance with its GPQ will
<br />continue to pump 3,500 AF from City wells every year. This quantity supplements those supplies
<br />purchased from Zone 7. Groundwater is assumed to be drought-resistant and would be reliable in
<br />all years. In the event of an extreme emergency, Pleasanton could extract additional groundwater
<br />above the GPQ; however, groundwater replenishment fees may be levied by Zone 7, or could be
<br />waived in the event of an extreme emergency or other reduction; such as, environmental mitigation
<br />needs which may temporarily reduce Sacramento-San Joaquin Delta deliveries in any given year."
<br />This WSA finds that the City of Pleasanton has sufficient water supplies provided by Zone 7 and
<br />within its existing groundwater pumping quota under all hydrologic conditions. Due to Zone 7's long-
<br />term success of delivery of water to all customers and commitment to continue to serve treated
<br />water to all retailers, when SWP curtailments occur, Zone 7 has supply flexibility through increased
<br />groundwater pumping, surface water transfers back and from CSWD and STWSD to continue to
<br />meet all demands. In addition, Zone 7, the City of Pleasanton, DSRSD and the CWSC of Livermore,
<br />could pump additional local groundwater during drought, emergency or other surface supply
<br />reductions to meet demands in the future. Furthermore, as presented in Section 5 consumers and
<br />retailers could effectively reduce demands by 10 or 25 percent to relieve demand pressure on Zone
<br />7 supplies. It is reasonable to assume, based on the consumer demand reductions in 1992 that
<br />Zone 7 customers would again cutback on per-capita use and reduce demands by up to 25
<br />percent.38
<br />7.2.1 Staples Ranch Project Water Supply Sufficiency
<br />The proposed Staples Ranch project would create an estimated 342 AFA new demand, or about
<br />0.50 percent of Zone 7's anticipated total system demand of 65,490 AFA in 2014, and 0.49 percent
<br />of overall treated water demands of 69,370 AFA by 2030 As stated previously, the UWMP adopted
<br />in 2002 includes potential water demands that would be generated by land uses designated by the
<br />1989 Stoneridge Drive Specific Plan, including 100 acres of commercial development and a 17.2
<br />acre community park on the Staples Ranch project site. Potential water demands were estimated
<br />for the land uses of the Stoneridge Drive Specific Plan; however, a 20 year gap exists between this
<br />adopted Specific Plan and actual project implementation. Moreover, within this 20 year period, land
<br />use and water supply planning has evolved and water demand factors associated with specific land
<br />uses or facilities has been refined. With that understanding, this WSA, per the requirements of SB
<br />610 calculates the water demands of the current proposed project by assuming water demands
<br />factors associated with these proposed uses.
<br />37 2002 City of Pleasanton, Urban Water Management Plan page 2-4.
<br />38 Only voluntary stages were implemented from the City's drought ordinance. In 1991 and 1992 the City experienced a
<br />high level of customer cooperation. 2002 City of Pleasanton, Urban Water Management Plan, page 10-4.
<br />P1Projecla - WP OnIyUt182.01 Staples Ranch WSA~FinahFinal WSAdoc 7-4
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