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1. 0 INTRODUCTION <br /> I <br /> 1. 1 BACKGROUND <br />' On June 26, 1985, pursuant to a permit issued by the San <br /> Joaquin County Public Health Services Department (County) , two <br /> 10, 000-gallon underground gasoline storage tanks were removed <br /> from the Montgomery Ward Auto Service Center (Ward) facility <br /> located at 5400 Pacific Avenue, Stockton, California (Site) <br /> (see Figures 1 and 2) . <br /> On August 28 , 1986, one 550-gallon waste oil tank was <br /> excavated and removed from the Site. This tank was located at <br /> the south east corner of the Montgomery Ward Auto Service Center <br /> 1 building. One soil sample was collected from beneath the tank <br /> by Canonie Environmental Services Corp. and analyzed for total <br /> petroleum hydrocarbons (TPH) , purgeable aromatics, purgeable <br />' halocarbons and PCBs using EPA Methods 8015, 8020, 8010 and 8080 <br /> respectively. No concentrations of TPH, purgeable aromatics or <br /> PCBs above laboratory detection limits were detected in the soil <br /> sample. Only trichlorofluoromethane with a concentration of <br /> 0 . 05 ppm was detected in the soil sample among all purgeable <br /> halocarbons. <br /> On June 22, 1988 , four bulk oil tanks (two 1000-gallon and <br /> two 500-gallon) were excavated and removed from the Site. These <br /> tanks were located on the north side of the Montgomery Ward Auto <br /> Service Center building, between the building and Robinhood <br /> Drive. Two soil samples were collected from beneath each tank <br /> by Canonie Environmental Services Corp. and analyzed for total <br /> petroleum hydrocarbons (TPH) , benzene, toluene, xylenes and <br />' ethylbenzene (BTXE) . No concentrations of TPH or BTXE above <br /> laboratory detection limits were present in any of the samples. <br />' 1. 1. 1 A. D. Selditch & Associates— Inc. <br /> In May 1988, A. D. Selditch & Associates, Inc. (ADS) drilled <br /> and sampled five borings at the Site to determine whether any <br /> release had occurred in the former vicinity of the underground <br /> gasoline storage tanks (see Figure 2) . Four of the borings <br /> (borings 1 through 4) were located in the former area of the <br /> gasoline tanks, and one boring (boring 5) was located in the <br /> west corner of the Site to determine background soil conditions. <br /> Two of the borings (borings 3 and 4) encountered auger refusal <br /> at 12 feet below grade surface (bgs) , i.e. , the slab on which <br /> the tanks had been located was apparently encountered. <br /> Detectable concentrations of TPH ranging from 8 to 38 parts <br /> per million (ppm) were encountered in only three of the samples <br /> tested. The detectable concentrations were all present in soil <br /> samples obtained from borings 3 and 4 . Total lead <br />' Project No. 1232 --1- <br /> ENVIRONMENTAL AUDIT,INC® <br />