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City of Pleasanton 5.0 Demands Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project Table 6-7: Dry Year Supply and Demand with Voluntary 25% Conservation (AFA) Purchase Re uest Year 2010 2015 2020 2025 2030 Normal Year Su I a 18,320 21,800b 22,700 23,400 23,400 25% Zone 7 Delive Curtailment° 13,740 16,350 17,025 17,550 17,550 GPQ 3,500 3,500 3,500 3,500 3,500 Demand with 25 % Conservation°'d 17,240 19,850 20,525 21,050 21,050 Notes: a. City of Pleasanton purchases 80 percent of supply Zone 7 through an annual ConVactor/Purchase delivery request, Table 8 Water Demands by Customer from the 2005 Zone 7 Water Agency Urban Water Management Plan, page 35. b. This assumes curtailment by SWP to Zone 7; and 25% cutback to Zone 7 water retailers; however, additional supplies would come from other 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 reasonable to assume that this would happen in the future. c. In 1991 and 1992 only voluntary demand reduction stages were implemented from the City's drought ordinance; the City experienced a high level of customer cooperation. 2002 City of Pleasanton, Urban Water Management Plan, page 10-4. d. City staff met with the Tri-Valley Water Retailers group to continue contingency planning. A joint publication will outline the issues, address the reduced pumping, and request a 10% voluntary conservation effort;. Even without the pump shutdown, the Tri-Valley Retailers would be looking for improved conservation methods due to the dry winter season. Operations group has been coordinating with adjacent jurisdictions to assure that water is moved throughout the region to avoid one retailer absorbing the full effect of a pump shutdown. City Managers Letter to City Council June 2007. Source: Ada ted from Ci of Pleasanton 2002 Urban Water Mana ement Plan Table 10-1, a e 10-3. 6.1.3 Staples Ranch Project Demands 6.1.3.1. Historical Project-Site Demands Historically, the Staples Ranch project site has been used for non-irrigated agriculture. Currently, the County allows dry-land hay production as a means of fire control. Therefore, the proposed project gross water demands are also considered the net change in water demands. The calculated demands for proposed project demands would be greater than existing demands. 6.1.3.2. Projected Project Demands The expected water use of the proposed project was determined by analyzing demand based on lot size and the associated demand from parks, open space and roads. To determine the water demand factors of the proposed project, water use demand factors were formulated based on data from the 1994 Proposed Water Demand/Wastewater Generation Factors Report by Nolte Engineering and West Yost and Associates, as well as current and historical uses at similar facilities along with information from City and Zone 7 staff. A final land use plan has not been approved; accordingly, Table 6-8 presents the current proposed land uses and available land use options. The calculated demand represents the worse-case scenario of the potential demand for the proposed project. As stated in the Project Description, in July 2007 the City Council determined that 5 acres of the 16-acre retail/office land use could also be used for a joint neighborhood park/stormwater detention facility. As a result of this action, this analysis employed the higher water demands associated with the 16-acres of retail/commercial to calculate aworse-case water demand scenario. As such, the water demands at the Neighborhood Park are not counted in total water demand. Table 6-8 shows that the proposed project would contribute approximately 349 AFA in water supply demands above the existing demands. 6.1.3.3. Projected Dry-Year and Multiple Dry-Year In dry years, it is anticipated that the proposed Staples Ranch demand of approximately 349 AFA will not change unless retailers and consumers are specifically asked to reduce demands. P:\Projects - WP Only\41162.01 Staples Ranch WSA\Final\Final WSA.doc 6-5