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City of Pleasanton 5.0 Demands
<br />Final Water Supply Assessment
<br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project
<br />Table 6-5: City of Pleasanton Normal/Average Year Total Demands
<br /> Demand Pro'ec tions
<br />Treated Water Purchase Year 2005 2010 2015 2020 2025 2030
<br /> 15,670
<br />Purchased from Zone 7a Actual use 14,533 18,320 21,800b 22,700 23,400 23,400
<br />GPQ 3,500 3,500 3,500 3,500 3,500 3,500
<br />Total Water Delivered 19,170 21,820 25,300 26,200 28,900 26,900
<br />Notes:
<br />GPQ: Groundwater Pumping Quota
<br />a. City of Pleasanton purchases 80 percent of supply Zone 7 through an annual Contractor/Purchase delivery request, Table 8 Water Demands by
<br />Customer from the 2005 Zone 7 Water Agency Urban Water Management Plan, page 35.
<br />b. Buildout occurs in 2025 - it is estimated that demands would not change dramatically after buildout -assumes "natural conservation through
<br />new fixtures" 2002 Cit of Pleasanton Urban Water Mana ement Plan, Table 3-2 Baseline Water Pro'ections, a e 3-8.
<br />As shown in Table 6-5 actual deliveries by Zone 7 to the City in 2005 were less than the requested
<br />annual amounts from the City to Zone 7; therefore, any demand reductions could and do achieve
<br />some amount of water savings in Pleasanton.
<br />Although, Zone 7 can meet all demands in any given year, demand reductions or water savings
<br />achieved through conservation programs could reduce demand pressure on regional Zone 7
<br />supplies. This WSA estimates, in Tables 6-6 and 6-7, the results of 10 and 25 percent voluntary
<br />conservation by Pleasanton, in the event that Zone 7 reduces deliveries similar to past reductions
<br />that occurred in 1929-1934, 1977 and 1987-1992 or that could occur in the future due to potential
<br />environmental mitigation needs within the Sacramento-San Joaquin Delta.34 The tables assume that
<br />during Normal water years any water supply cutbacks from Zone 7, such as 10 and 25 percent have
<br />similar corresponding water savings by Pleasanton.
<br />Table 6-6: Dry Year Supply and Demand with Voluntary 10% Conservation (AFA)
<br />Purchase Re uestYear 2010 2015 2020 2025 2030
<br />Normal Year Su I a 18,320 21,800 22,700 23,400 23,400
<br />10% Zone 7 Delive Curtailment 16,488 19,620 20,430 21,060 21,060
<br />GPQ 3,500 3,500 3,500 3,500 3,500
<br />Demand with 10% Conservation ~ 19,988 23,120 23,930 24,560 24,560
<br />Notes:
<br />a. City of Pleasanton purchases 80 percent of supply Zone 7 through an annual Contractor/Purchase delivery request, Table 8 Water Demands by
<br />Customer from the 2005 Zone 7 Water Agency Urban Water Management Plan, page 35.
<br />b. This assumes curtailment by SWP to Zone 7; and 10% cutback to Zone 7 water retailers; however, additional supplies would come from other
<br />Zone 7 sources as shown in Table 5-2. Zone 7 did cutback full delivery in past dry year scenarios (1929-1934); (1977); (1987-1992) and it
<br />reasonable to assume that this would happen in the future.
<br />c. In 1991 and 1992 only voluntary demand reduction stages were implemented from the City's drought ordinance; the City experienced a high
<br />level of customer cooperation. 2002 City of Pleasanton, Urban Water Management Plan, page 10-4.
<br />d. City staff met with the Tri-Valley Water Retailers group to continue contingency planning. A joint publication will outline the issues, address the
<br />reduced pumping, and request a 10% voluntary conservation effort;. Even without the pump shutdown, the Tri-Valley Retailers would be looking
<br />for improved conservation methods due to the dry winter season. Operations group has been coordinating with adjacent jurisdictions to assure
<br />that water is moved throughout the region to avoid one retailer absorbing the full effect of a pump shutdown. City Managers Letter to City
<br />Council June 2007.
<br />Source: Ada ted from Ci of Pleasanton 2002 Urban Water Mana ement Plan Table 10-1, a e 10-3.
<br />34 Zone 7 did cutback full delivery in past dry years (1929-1934); (1977); (1987-1992) and it reasonable to assume
<br />that this would happen in the future. Voluntary demand reductions as shown in Table 10-1 City of Pleasanton 2002
<br />Urban Water Management Plan, page 10-3.
<br />P:\Projects - WP Only\41162.01 Staples Ranch WSA\Final\Final WSA.doc 6-'Y
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