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.� San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures <br /> Development Department Groundwater and Groundwater Quality <br /> 3.1-1 Groundwater and Groundwater Quality <br /> Introduction <br /> This section describes existing groundwater and groundwater quality in the <br /> project area;presents the federal,state, and local policies and regulations that <br /> determine mitigation requirements; and identifies impacts associated with <br /> implementation of the proposed Project. Potential impacts of Project alternatives <br /> on groundwater and groundwater quality are described and analyzed in <br /> Chapter 4,"Alternatives Analysis." <br /> The key sources of data and information used in the preparation of this section <br /> are: <br /> tr <br /> ■ Western U. S. Precipitation Frequency Maps and Climate Summaries, <br /> Western Regional Climate Center(WRCC); <br /> a ■ California Department of Water Resources (DWR)Groundwater Bulletin <br /> 118-2003 Update; <br /> ■ Groundwater Depths and Elevations,Thinning Aggregate Quarry,Vernalis, <br /> California,prepared by Kleinfelder(2003b)(Appendix I). <br /> ■ San Joaquin County Public Health Services Groundwater Well Permits; and <br /> ■ Personal communication with the San Joaquin County Environmental Health <br /> Department. <br /> Environmental Setting <br /> Physical Setting <br /> This section discusses the existing conditions relating to groundwater and <br /> groundwater quality in the project area, as well as federal, state, and local <br /> regulations relating to groundwater and groundwater quality that would apply to <br /> the proposed Project. <br /> Existing Conditions <br /> The project area has a typical Mediterranean climate with wet, cool winters,and <br /> warm,dry summers. Most of the rainfall occurs during November through April <br /> with an average annual rainfall ranging between 9.94 and 12.2 inches(WRCC <br /> i <br /> DeSilva Gates Quarry Project <br /> Draft Environmental Impact Report 3.H-1 <br /> J85 05105.05 <br /> r <br />