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City of Pleasanton 3.0 Water Supply Planning Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project water systems that meet the specific connection criteria, while WSAs are required as part of the environmental review process for each individually qualifying project. As a result, the 20-year planning horizons for each qualifying project may cover slightly different planning periods than other WSAs or the current UWMP. Additionally, not all water providers who must prepare a WSA for a qualifying project under SB 610 are required to prepare an UWMP as defined in the Urban Water Management Planning Act. Especially pertinent to this WSA for the proposed project, and all projects to be served by the City of Pleasanton, are the provisions under SB 610 that involve documentation of supply if groundwater is to be used as a source. A detailed discussion of the groundwater basin and groundwater production can be found in sections 5.3.4.1 and 5.3.4.2. Briefly, the City of Pleasanton owns and operates three groundwater production wells. The total pumping capacity of these wells is approximately 7,000 gallons per minute, or an average daily capacity of 10 million gallons per day (mgd). The City limits production of its wells through contract with Zone 7 for groundwater management purposes, to an annual withdrawal of 3,500 acre-feet annually (AFA). However, these three City wells are capable of supplying up to approximately 11,000 acre-feet annually if needed. The City uses groundwater to supply approximately 20% of its total City water demand, and purchases the remaining 80% of City water demand as treated water supplies from Zone 7 of the Alameda County Flood Control and Water Conservation District, hereinafter Zone 7. Zone 7 also owns and operates seven wells located within three well fields, also located in Pleasanton. The Zone 7 groundwater wells have a peak pumping capacity of 32 mgd. The SB 610 WSA process involves answering the following questions: Is the project subject to CEQA? • Is it a project under SB 610? • Is there a public water system? • Is there a current UWMP that accounts for the project demand? • Is groundwater a component of the supplies for the project? • Are there sufficient supplies available to serve the project over the next 20 years? 4.1.1 "Is the Project Subject to CEQA?" The first step in the SB 610 process is determining whether the project is subject to CEQA. SB 610 amended Public Resources Code Section 21151.9 to read: "Whenever a city or county determines that a project, as defined in Section 10912 of the Water Code, is subject to this division [i.e., CEQA], it shall comply with part 2.10 (commencing with Section 10910) of Division 6 of the Water Code." The Project is currently under environmental review pursuant to the requirements of CEQA; therefore, the information contained in this assessment will be used to support the Environmental Impact Report (EIR) for the project-level analysis. 4.1.2 "Is It a Project Under SB 610?" The second step in the SB 610 process is to determine if a project meets the definition of a "Project" under Water Code Section 10912 (a). Under this section, a "Project" is defined as meeting any of the following criteria: P:\Projecta - WP Only\41162.01 Staplea Ranch WSA\Fina~Final WSA.doc 4-2