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THE CITY OF 7x14 .m pLEASANTONO Housing Element Update DRAFT WATER SUPPLY ASSESSMENT HOUSING ELEMENT UPDATE PROJECT (UPDATED NOVEMBER 2011) As the public water supplier that will supply water to proposed projects in the area, the City is required to prepare Water Supply Assessments (WSA5), under the requirements of Senate Bills 610 and 221, codified in Government Code Sections 65867.5, 66455.3, and 66473.7 if a proposed project meets certain criteria. There are three primary areas to be addressed in a WSA: (1) all relevant water supply entitlements, water rights, and water contracts; (2) a description of the available water supply entitlements, water rights, and water contracts; (3) and analysis of the demand placed on those supplies, by the project, and relevant existing and planned future uses in the area. If water demand for a project includes groundwater as a source of water supply, Section 10910(0 of the California Water Code requires a groundwater basin review as part of the assessment. The WSA for the Stoneridge Drive Specific Plan Amendment/Staples Ranch project, herein referred to as "Staples Ranch", was adopted by the Pleasanton City Council on December 18, 2007. The Staples Ranch WSA reviewed Zone 7 Water Agency's service area within the Tri- Valley region; the City of Pleasanton's service areal; water supply entitlements; water rights; water contracts; and contains a groundwater basin review2. Zone 7 Water Agency's Annual Sustainable Water Supply report (Annual Review) and demand changes contained therein were subsequently reviewed for calendar years 2008, 2009, 2010, and 2011 as WSA updates. Except as updated in Sections III and IV (below) and Exhibit H (attached), the WSA approved by the Pleasanton City Council in 2007 for Staples Ranch, including the subsequent updates between 2008 and 2011, still provides a valid assessment of water supply and demand for the City of Pleasanton. I. PROJECT DESCRIPTION In accordance with State law, the City of Pleasanton proposes to adopt a General Plan Amendment to update its existing Housing Element and to implement recommendations contained I City of Pleasanton,Water Supply Assessment for the Stoneridge Drive Specific Plan Amendment/Staples Ranch, 2007, pages 5-1 to 5-3. 2 City of Pleasanton,Water Supply Assessment for the Stoneridge Drive Specific Plan Amendment/Staples Ranch,2007, pages 4-4 and 5-3 to 5-17. Draft Water Supply Assessment—Updated November 2011 Page 1 of 17