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City of Pleasanton
<br />Final Water Supply Assessment
<br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project
<br />3.0 Water Supply Planning
<br />4.0 Water Supply Planning
<br />Califomia has different processes to plan for development or maintenance of water supplies on a
<br />regional level. Urban Water Management Plans (UWMPs), Groundwater Management Plans
<br />(GMPs), Integrated Regional Water Management Plans (IRWMPs), Municipal Service Reviews
<br />(MSRs) and water resources components of General Plans all integrate some degree of regional
<br />planning of water supply and demand.
<br />To complement these large -scale planning processes, the Govemor signed into law Senate Bills 610
<br />and 221 in 2002, which emphasize the incorporation of water supply and demand analysis at the
<br />earliest possible stage in the planning process for projects undergoing more specific or detailed
<br />planning level analysis. These legislations primarily apply to the planning of water supplies and
<br />sources for individual subdivision projects, and are completed at the time the project is being
<br />proposed and permitted. SB 610 amended portions of the Water Code, including Section 10631,
<br />which contains the Urban Water Management Planning Act, and added Sections 10910, 10911,
<br />10912, 10913, and 10915, which describe the required elements of a WSA. SB 221, which requires
<br />completion of a Water Supply Verification (WSV), amended Section 65867.5 and added Sections
<br />66455.3 and 66473.7 to the Govemment Code.
<br />4.1 Water Supply Planning Under SB 610 and SB 221
<br />As the public water system that will supply water to proposed projects in the area, the City is
<br />required to prepare WSAs and WSVs, under the requirements of Senate Bills 610 and 221, codified
<br />in Government Code Sections 65867.5, 66455.3 and 66473.7 if a proposed project meets certain
<br />criteria. There are three primary areas to be addressed in a WSA: (1) all relevant water supply
<br />entitlements, water rights, and water contracts; (2) a description of the available water supplies and
<br />the infrastructure, either existing or proposed, to deliver the water, and (3) an analysis of the demand
<br />placed on those supplies, by the project, and relevant existing and planned future uses in the area.
<br />In addition to these items, WSVs incorporate more detailed confirmation that the appropriate
<br />infrastructure planning and funding are in place to fully commit water supplies to a project. The
<br />proposed project does not include a "subdivision" as defined by Govemment Code Section
<br />66473.7(a)(1); therefore, a WSV is not required for the proposed project.`
<br />Senate Bill 610 is applicable to projects subject to the Califomia Environmental Quality Act (CEQA)
<br />or considered a "project" under Water Code Section 10912(a) or (b), builds on the information that is
<br />typically contained in a UWMP. The amendments to Water Code Section 10631 were designed to
<br />make WSAs and UWMPs consistent. A key difference between the WSAs and UWMPs is that
<br />UWMPs are required to be revised every five years, in years ending with either zero or five for those
<br />3 Department of Water Resources, Guidebook for Implementation of SB 610 and SB 221 of 2001, 2003.
<br />4 Govemment Code Section 66473.7(a)(2) states:
<br />'Sufficient water supply' means the total water supplies variable during a normal, single -dry, and multiple -dry years
<br />within a 20- yearpmjection that will meet the projected demand associated with the propose subdivision, in addition
<br />to existing and planned future uses, including, but not limited to agricultural and industrial uses. In determining
<br />'sufficient water supply', all of the following factors shall be considered:
<br />(a) The availability of water supplies over a historical record of at least 20 years.
<br />(b) The applicability of an urban water shortage contingency analysis prepared pursuant to Section 10632 of the
<br />Water Code that includes actions to be undertaken by the public water system in response to water supply
<br />shortages.
<br />(c) The reduction in water supply allocated to specific water use sector pursuant to a resolution or ordinance
<br />adopted or a contract entered into, by the public water system, a long as that resolution, ordinance, or
<br />contract does not conflict with Section 354 of the Water Code.
<br />(d) The amount of water that the water supplier can reasonably rely on receiving from other water supply projects,
<br />such as conjunctive use, reclaimed water, water conservation, and water transfer, including program identified
<br />under federal, state, and local water initiatives such as CALFED and Colorado River tentative agreements, to
<br />the extent that these water supplies meet the criteria of subdivision (d).
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