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City of Pleasanton 6.0 Supply Demand Comparison Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project 7.0 Supply-Demand Comparison This section reviews the regional, local, and project-level supply and demand considerations. 7.1 Regional Water Supply Sufficiency Zone 7, as the Tri-Valley wholesale water provider, adopted a Water Supply Reliability Policy in 2002 (Board Resolution No. 04-2662) and revised the resolution in 2004. This policy states "maintain the ability to meet 100 percent of Zone 7's estimated treated water demands 100 percent of the time, including during amulti-year drought period." The "Reliability Policy for Municipal and Industrial Water Supplies," adopted by the Zone 7 Board in May 2002 and revised in August 2004 has two "Goals", the most important for water supply, reads: Goal 1: meet 100 percent of its treated water customers water supply needs in accordance with Zone 7's most current contracts for Municipal and Industrial (M&I) Water Supply, including existing and projected demands for the next twenty (20) years, even during extended drought periods. Zone 7 will endeavor to meet this goal during an average water year, a single dry water year, and multiple dry water years. In April of every year, Zone 7 prepares an assessment of sustainable water supplies for the Livermore-Amador Valley. As shown in Table 7-1 below, the 2007 sustainable supply is 87,500 AF as presented in Zone 7's 2007 Sustainable Water Supply Report [Appendix A] and current estimated 2030 "Buildout Demand" is 69,370 AF. Operational studies used in this assessment demonstrate that Zone 7 has sufficient water supply to meet this future demand for every hydrologic year on record.35 The 2007 Sustainable Water Supply Report concludes that Zone 7 has sufficient sustainable supplies to provide for all treated water demands through build-out and for all currently contracted untreated water demands. Again, as previously discussed in Section 4, Zone 7's reliability to deliver water to the Livermore-Amador Valley is secured in a variety of water supply sources that allows Zone 7 a great degree of flexibility within its supply portfolio to meet demands through 2030. Table 7-1: Zone 7 2007 Long-term Sustainable Water Supply AFA State Water Project 60,900 Lake Del Valle 9,300 BBI D 2,000 Zone 7 Sustainable Su I Subtotal 72,200 Retailer Groundwater Safe Yield Quanti 13,400 Rec cled Water su I 1,900 Total Sustainable Water Su I 87 500 Source: Zone 7 Water A en Annual Review Of The Sustainable Water Su I , Ma 16, 2007. 35 2005 Zone 7 Water Agency, Urban Water Management Plan, page 25. PiProjects - WP OnIy141162.01 Staples Rench WSA~FinallFlnal WSAdoc 7-1