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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 The UWMP adopted in 2002 includes potential water demands that would be generated by land uses designated by the 1989 Stoneridge Drive Specific Plan, including 100 acres of commercial development and a 17.2 acre community park on the Staples Ranch project site. In 1989 when the Stoneridge Drive Specific Plan was adopted no land use and water supply planning legislation existed in California. In fact, the first legislation of this type was passed in the early 1990's. Potential water demands were estimated for the land uses of the Stoneridge Drive Specific Plan; however, a 20 year gap exists between the adopted Specific Plan in project implementation. Moreover, within this 20 year period, land use and water supply planning has evolved and water demand factors associated with specific land uses or facilities has been refined. With that understanding, this WSA, per the requirements of SB 610 calculates the water demands of the current proposed project by assigning water demands factors associated with these proposed uses. 4.1.5 "Is groundwater a component of the supplies for the project?" The requirements of Water Code Section 10910(f), parts 1 through 5, apply if groundwater is a source of supply for a Project. Both Pleasanton and Zone 7 extract groundwater to supplement other water supply sources. Zone 7 has a GMP that establishes management plan elements, GMP goals, basin management objectives (BMOs), and stakeholder involvement. As a water retailer, Pleasanton along with, the California Water Service Company (CWSC) of Livermore, and the Dublin- San Ramon Services District have agreed to groundwater extraction limits known as a Groundwater Pumping Quota (GPQ). These limits help to maintain groundwater basin storage. The total annual GPQ for these thee retail water agencies is approximately 6,600 acre feet. The safe yield of the Tri- Valley's groundwater basin is approximately 13,400 acre-feet per year. There are additional groundwater uses from the agricultural and mining industries located in the Valley. However, the annual uses from these industries remain less than the "net" safe yield of the local groundwater basin. 4.1.6 "Are There Sufficients Supplies to Serve the Project Over the Next Twenty Years?" The final step in the SB 610 process is to illustrate the available water supplies, including the availability of these supplies in all water-year conditions (normal, single dry year and multiple dry years) over a 20-year planning horizon, and an assessment of how these supplies relate to project- specific and cumulative demands over that same 20-year period. In this case, the period is projected to 2030. The regional and local supply and demand comparisons are included in Section 6. Government Code Section 66473.7(a)(2) states: 'Su~cient water supply' means the total water supplies variable during a normal, single-dry, and multiple-dry years within a 20-year projection that will meet the projected demand associated with the propose subdivision, in addition to existing and planned future uses, including, but not limited to agricultural and industrial uses. In determining `sufficient water supply', all of the following factors shall be considered: (e) The availability of water supplies over a historical record of at least 20 years. (t) The applicability of an urban water shortage contingency analysis prepared pursuant to Section 10632 of the Water Code that includes actions to be undertaken by the public water system in response to water supply shortages. (g) The reduction in water supply allocated to specific water use sector pursuant to a resolution or ordinance adopted or a contract entered into, by the public water system, a long as that resolution, ordinance, or contract does not conflict with Section 354 of the Water Code. (h) The amount of water that the water supplier can reasonably rely on receiving from other water supply projects, such as conjunctive use, reclaimed water, water conservation, and water transfer, including program identified under federal, state, and local water initiatives such as CALFED and Colorado River tentative agreements, to the extent that these water supplies meet the criteria of subdivision (d). P:\Projecla - WP OntyN1162.01 Staplea Ranch WSA\FinahFinal WSA.doc 4-4