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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures <br /> Development Department Surface Hydrology,Stormwater,and Water Quality <br /> 3.13 Surface Hydrology, Stormwater, and Water <br /> Quality <br /> Introduction <br /> This section describes existing surface hydrology, stormwater, and water quality <br /> in the project area;presents the federal, state,and local policies and regulations <br /> that determine mitigation requirements; and identifies impacts associated with <br /> implementation of the proposed Project. Potential impacts of Project alternatives <br /> on surface hydrology, stormwater,and water quality are described and analyzed <br /> in Chapter 4, "Alternatives Analysis." <br /> The key sources of data and information used in the preparation of this section <br /> are listed below. <br /> ... ■ Western U.S. Precipitation Frequency Maps and Climate Summaries, <br /> Western Regional Climate Center(WRCC). <br /> ■ 2002 Clean Water Act(CWA)Section 303(d)List of Water Quality Limited <br /> Segment, Central Valley Regional Water Quality Control Board(Central <br /> Valley RWQCB)and a 2002 303(d)Monitoring List. <br /> ■ Water Quality Assessment of the State Water Project, 1998-99. <br /> ■ Geographic Information by Hydrologic Region—San Joaquin River <br /> Hydrologic Region. <br /> ■ Federal Emergency Management Agency(FEMA)Flood Insurance Rate <br /> Map. <br /> ■ San Joaquin County General Plan. <br /> Environmental Setting <br /> Physical Setting <br /> This section discusses the existing conditions relating to hydrology and water <br /> quality in the study area and federal, state, and local regulations relating to <br /> surface hydrology and surface water quality that apply to 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 /> DeSllva Gales Quarry Project <br /> Draft Environmental Impact Report 3.G-1 <br /> J8S 05105.05 <br />