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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 /> 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 /> D Cox of the Stockton Public Utilities District has confirmed <br /> the locations of the two municipal wells found in the DWR <br /> records . He also indicated that all housing along Paloma Avenue <br /> and El Camino Avenue between Thornton Road and Lower Sacramento <br /> Road ( Figure 1 ) is outside an organized water distribution system <br /> and is dependent on well water . He estimated that there are 50 <br /> 4 wells in this area ( pers comm. July 1989 ) . <br /> 1 4 SITE HISTORY <br /> Former Exxon service station RS 7- 1050 was in operation on the <br /> site from at least 1967 until early 1986 . The service station <br /> was closed after the product lines failed a tightness test in <br />` November 1985 The amount of fuel that was lost from the line is <br /> unknown . <br /> In pursuit of site closure, Exxon Company, U. S.A. began inves- <br /> tigating the subsurface release in accordance with the guidelines <br /> cf the San Joaquin Local Health District . Exxon initially con- <br /> i <br />' tracted Groundwater Technology, Inc. ( GTI ) to conduct a series of <br /> subsurface investigations at the site , which were completed <br /> between December 1985 and August 1987 . <br /> e25/71050/8-89/txt 4 <br /> 1 <br />