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III. Environmental Setting,Impacts,and Mitigations <br /> K. HYDROLOGY GEOHYDROLOGY AND 3Y TER QUALITY <br /> SETTING <br /> Introduction <br /> The existing Austin Road Landfill and the proposed landfill expansion are subject to numerous <br /> regulations governing solid waste landfills regarding siting,design and operation,groundwater <br /> monitoring,corrective action,financial assurance,and closure and post closure requirements. <br /> The principal regulations related to hydrology,geohydrology,and water quality are contained <br /> within: (1)California Code of Regulations(CCR),Title 14,Division 7, Solid Waste <br /> Management Regulations; (2)CCR,Title 23,Division 3,Chapter 15,Discharges of Waste to <br /> Land;and(2)40 Code of Federal Regulations(CFR)parts 257 and 258,known as Subtitle D of <br /> the Resource Conservation and Recovery Act. A detailed listing of applicable regulations and <br /> the project design elements intended for compliance is provided in the Design Study Report for <br /> the Austin Road Landfill Expansion (R.W. Beck and Associates, 1992a and b). Detailed <br /> information regarding the existing Austin Road Landfill is also contained in the California <br /> Regional Water Quality Control Board,Central Valley Region(CVRWQCB)Order no. 90-122 <br /> and Monitoring and Reportion Program No. 90-122. The following discussion of hydrology, <br /> geohydrology, and water quality includes information from these and other sources,some of <br /> which is summarized or paraphrased. ESA has independently evaluated the information <br /> contained in project-related reports and conducted a site reconnaissance on March 19, 1993. <br /> Climate <br /> The climate of San Joaquin County is characterized by long,dry summers and cool,rainy <br /> weather between November and April. The average annual rainfall in the project vicinity is about <br /> 14 inches a year. The 100-year 24 hour storm event is estimated to produce 3.2 inches of rainfall <br /> (R.W. Beck and Associates, 1992b). Consideration of the 100-year precipitation event is <br /> required for Class III landfills by state and federal regulations. <br /> Surface H dv rology <br /> Local Watershed <br /> The project site is within the Little Johns Creek watershed, and the North Branch of the South <br /> Fork Little Johns Creek crosses the site from east to west. About 1.5 miles west of the site,Little <br /> III.K.1 <br />