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City of Pleasanton 7.0 Conclusion Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project 8.0 Conclusion According to the requirements of Water Code Section 10910(c)(3) "the water supply assessment for the project shall include a discussion with regard to whether the public water system's total projected water supplies available during normal, single dry, and multiple dry water years during a 20-year projection will meet the projected water demand associated with the proposed project, in addition to the public water system's existing and planned future uses, including agricultural and manufacturing uses." As previously shown in Tables 7-2, 7-3, and 7-5, Zone 7 can meet all water demands in normal, single dry and multiple dry years by utilizing its current and expanding water supply portfolio. Further, in the event of single or multiple dry year scenarios when SWP water would be curtailed, Zone 7 has created water supply flexibility and bolstered reliability through groundwater banking programs, Out-of-Basin water storage, additional SWP water transfers and increasing surface water storage through the Chain of Lakes system. Overall water supplies in the Livermore-Amador Valley will be adequate in all year types to meet planned development throughout Zone 7's service area. Again, voluntary demand reduction measures during dry years would help alleviate system demand capacities during periods of SWP curtailments (for drought, emergency or environmental mitigation reasons) and it is reasonable to assume that this level of conservation could be achieved again as it was in 1992.39 This WSA finds that Zone 7, as the potable water supplier to the Livermore-Amador Valley, has sufficient water supplies available to serve the City of Pleasanton, City of Livermore, and City of Dublin along with the other customers now and over a 25 year planning horizon. With that understanding, the City of Pleasanton as a Zone 7 water purchaser has adequate water supplies provided through the Agreement with Zone 7 to meet project demands and cumulative demands through buildout 2025 and beyond to 2030. 39 In 1991 and 1992 the City experienced a high level of customer cooperation. Only voluntary stages were implemented from the City's drought ordinance. 2002 City of Pleasanton, Urban Water Management Plan, page 10-4. P:~ProJec03-WP Ontyl{7762.01 Staples Ranch WSAIFinallFinal WSA.doc 8-1