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City of Pleasanton 1.0 Introduction Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project 2.0 Project Overview 2.1 Project Location The Staples Ranch project site is approximately 124 acres, 122.5 acres of which are located in unincorporated Alameda County and 1.5 acres of which are located in Pleasanton, between the cities of Pleasanton and Livermore. The property is bounded by I-580 on the north, EI Charro Road and the City of Livermore to the east, a number of sand and gravel quarries to the south, and the California-Somerset single-family residential development within the City of Pleasanton to the west. Figure 1 shows the regional location and more precise project location. 2.2 Project Description A Stoneridge Drive Specific Plan was adopted fora 293-acre area in 1989 by the City. The Specific Plan, which includes the Staples Ranch site, proposed approximately 128 acres of residential uses (38.5 acres of low density housing and 89.9 acres of medium density housing), 78 acres of service commercial/light industrial uses, 30 acres of commercial uses, 26 acres of parks, 5 acres of schools, 23.4 acres of roads, and 2.5 acres of public/institutional uses. Since 1989, large portions of the Specific Plan area have developed; the undeveloped portion is essentially the Staples Ranch site. The 124-acre Staples Ranch site consists of 122.5 acres that are outside the Pleasanton city limits but within its Sphere of Influence and Urban Growth Boundary; the remaining 1.5 acres of the project site lies within the city limits. The proposed project would involve annexation of the 122.5 acres of unincorporated Staples Ranch site to the City of Pleasanton. In addition to the Staples Ranch site, the lands to be annexed to the City would include up to an additional 36 acres of right-of-way along the Arroyo Mocho Channel, EI Charro Road, and Interstate 580 (I-580) that are also within the City's Sphere of Influence and Urban Growth Boundary. This larger area is referred to as the "Project Area," to distinguish it from the Staples Ranch site. As part of the annexation, the Project Area would be prezoned. The proposed Staples Ranch project includes the following development components 1) a 37-acre auto mall, with buildings and 3,270 parking stalls; 2) a senior continuing care community on 45 acres with approximately 800 assisted living units plus supporting skilled nursing facilities and up to 207 beds in the health center; 3) future commercial development of retail (175,000 square feet) or office uses (280,000 square feet) on 16 acres; 4) future development of an approximately 17-acre community park, which could include an optional multi-rink ice-skating facility on up to 8 acres; 5) an extension of Stoneridge Drive to the senior continuing care community and community park; 6) preservation of Stoneridge Drive extension right-of-way; 7) a new two-lane bridge; and 8) a new access road to the auto mall and the retail uses from EI Charro Road. In July 2007, City Council agreed to designate 5-acres of the 16 acres of commercial for a neighborhood park/stormwater detention basin. Figure 2 is the proposed Staples Ranch Land Use map. 2.3 Document Structure This report is organized following a basic hierarchy to describe each issue: regional context (Zone 7 Water Agency service area and the underlying groundwater basin), local context (City of Pleasanton service area), and finally, project-level analysis for the proposed Staples Ranch project. The report organization is as follows: 1) Introduction, project overview and description and project location. 2) City of Pleasanton background information and land-use planning. 3) General information on Water Supply Planning under SB 610. P:\Projecla - WP Onlyl{7162.01 Staples Ranch WSA\FinaOFinal WSA.doc 2-2