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_ _ P <br /> MR.06 '88 22:20 EXCELTECH/SF <br /> P.5 <br /> Fast-Gas Station exceLT8CH March 6, 1988 <br /> --� Page 2 Project No. 1813G <br /> 2.0 B6QKQRQlNQ <br /> 9 <br /> 3 The site is located at the southeast corner of the Intersection of Kottleman <br /> Lane (Highway 12) and Lower Sacramento Road in .Lod;, California. The <br /> subsurface geology at the site consists of clays, silty sands, and sands,from <br /> i <br /> approximately 0 to 50 feet in depth. The hydrogeology of the site consists of <br /> a perched, unconfined, water-table aquifer as interpreted by DuPont in their <br /> j 1987 report titled "Groundwater Contamination Assessment Report, Kayo 011 ? <br /> Company, Fast Gas Station, Boo S. Highway 12 in Lodi, California". Ground E <br /> r <br /> i. water occurs at approximately 42 to 44 feet below ground surface. The i <br /> saturated thickness of the aquifer varies from B to 8 feet. The shallow z <br /> ground-water surface is variable depending on drawdown created by <br /> production well pumping within the area. <br /> Previous contamination assessment investigations conducted: on the site ! <br /> have focused on soil and ground-water quality. Presently, 26 ground-water <br /> monitoring wells exist on and off-site. All wells (except MW-1 through <br /> 1 MW-9, MW-15, and MW-20) are completed in the shallow, unconfined aquifer. <br /> and fully penetrate it. More specific geologic and hydrogeologic Information <br /> r ' may be obtain®d In the previously.referenced 1987 DuPont report. <br /> t <br /> 3.0 <br /> A <br /> Aquifer testing was performed at this site during the period of February 8 <br /> z i " <br /> through February 11, 1988. Four types of tests were used to evaluate the <br /> i <br />