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gradient direction has been confirmed by subsequent gauging, but <br /> the water level in the wells has been steadily dropping and now <br /> stands at 57-58 feet below the surface. <br /> — 1 .3.3 Nearby Water Supply <br /> A search of the California Department of Water Resources well <br /> records . in Sacramento has revealed the locations of 15 wells <br /> within approximately 2,500 feet of the site. Information con- <br /> W cerning the ownership and location of the wells is listed in <br /> Table 1 , and the locations of the wells are shown in Figure 1 . <br /> j D• Cox of the Stockton Public Utilities District has. confirmed <br /> the. locations of the two municipal wells found in the DWR <br /> s <br /> records. He also indicated that all housing along Paloma Avenue <br /> and E1 .Camino avenue between Thornton Road and Lower Sacramento <br /> Road (Figure 1 ) is outside an organized water distribution system ' ' '. <br /> �j and is dependent on well water. He estimated that there are 50 ' <br /> wells in this area (pers. comma July 1989). <br /> f 1 <br /> �. .: . .1 .4 SITEHISTORY . <br /> Former Exxon .service station RS 7-1050 was in operation on. the <br /> site fromat least 1967 until early 198 <br /> The service station <br /> n � <br /> i was closed after the product lines failed a tightness test in <br /> November 1985. The amount-Of that was lost from the line is <br /> unknown. s <br /> i <br /> Ri In pursuit of site closure, .Exxon..,..Company,---:U'.S;;A-.: began -inves- <br /> tagating the . <br /> subsurface release inaccordance with the <br /> guidelines <br /> of. the .San 'Joaqu�n Local H 3 <br /> 1 ealth District. Exxon initially con- <br /> a tracted Groundwater Technology, Inc: (GTI) to conduct a series of <br /> subsurface investigations at. the site, which were c•::mpleted <br /> 1 <br /> ( between December 1985 and August 1987. <br /> e25/71050/8-8.9/txt 4 <br /> . . - <br /> i <br />