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❑ GROUNDWATER <br /> ❑® ER <br /> ❑❑❑❑❑ TECHNOLOGY, INC. <br /> OIL RECOVERY SYSTEMS 1832 Tribute Road, Suite G, Sacramento,California 95815 (91Q 921-1800 <br /> June 24 , 1987 <br /> Project No . 202175-3284 <br /> Mr . Darrell Hovander <br /> Chevron USA, Inc . <br /> 2 Annabel bane , Suite 200 <br /> San Ramon , CA 94583 <br /> RE : Chevron Service Station No . 7780 <br /> Stockton , California <br /> Dear Mr , Hovander : <br /> Enclosed are laboratory results of the soil samples <br /> collected from the material excavated from the tank pit and <br /> information on well locations within one mile of the former <br /> Chevron Service Station No . 7780 , located at 3246 East Fremont <br /> Street , Stockton , California . <br /> Soil samples were obtained at approximately five feet below <br /> the soil pile surface with a hand operated auger . The samples <br /> were collected at six points from the pile and composited to form <br /> two samples for laboratory analysis . These were sealed , capped, <br /> packed on ice in an insulated cooler and transported under <br /> chain-of-custody to GT Environmental Laboratories for analysis . <br /> The two composite samples were analyzed for total hydrocarbons <br /> (THC ) , and benzene , toluene , and xylene (BTX) using EPA methods <br /> 5030 , 8020 , and 8015 . Results from the soils analyzed recorded <br /> no concentration of THC or BTX above the analysis method <br /> detection limit of 0 . 5 parts per million (ppm) ( see Appendix I , <br /> Laboratory Analysis Results ) . <br /> A survey of water wells located within a one-mile radius of <br /> the site was performed using available data collected from the <br /> California Department of Water Resources . Review of this <br /> information indicates that within a one-mile radius of the site , <br /> there are three municipal wells and eleven domestic wells . The <br /> closest well is a domestic well which is located approximately <br /> 1000 feet north and down gradient of the site . The closest <br /> municipal well is located approximately 2500 feet to the east and <br /> cross gradient of the site (see Figure 1 , Well Location map) . <br /> O(f'ico thrmighrnrt the U.S., Canada and Overseas <br /> Westem offices in:Ornmcord. CA; Torrance, CA,-Englewood, CO; Tempe,AZ <br />