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h!' <br /> ! 1.0 INTRODUCTION <br /> 1.1 BACKGROUND <br /> On June 26, 1986, two 10,000-gallon underground gasoline <br /> storage tanks were removed from the Montgomery Ward Auto Service <br /> Center (Ward) facility located at 5400 Pacific Avenue, Stockton, <br /> California (Site) by Siebold Corporation pursuant to a permit <br /> issued by the San Joaquin County Public Health Services <br /> partment (County) <br /> De (see Figures 1 and 2) . The underground <br /> rinsed, stubbed back, capped and left in place. On <br /> piping was r <br /> August 2R, ins a waste oil tank was removed from the site. <br /> In May 1988, A. D. Selditch & Associates, Inc. (ADS) drilled <br /> and sampled five borings at the Site to determine whether <br /> tank systems impacted the environment <br /> operation of the former <br /> (see Figure 2) . Four of the borings (borings 1 through e were <br /> located in the former area of the gasoline tanks, and one boring <br /> (boring 5) was located in the west corner of the Site to <br /> determine background soil conditions. Two of the borings <br /> (borings 3 and 4) encountered auger refusal at 12 feet below <br /> grade surface (bgs) , i.e. , the slab on which the tanks had been <br /> located was apparently encountered. <br /> Detectable concentrations of total petroleum hydrocarbons <br /> (TPH) , ranging from 8 parts per million (ppm) to 38 ppm, were <br /> encountered in only three of the samples tested. The detectable <br /> concentrations were all present in soil samples obtained from <br /> borings m weae4. linalofthesamplestested. <br /> eaconcentrations <br /> ranging <br /> from 6 ppm <br /> to 36 pp present <br /> For specifics regarding the activities completed at the Site <br /> by ADS, see their report titled "Underground Tank Removal Area <br /> Evaluation, Montgomery Ward Site, Stockton, California," dated <br /> June 20, 1988. <br /> on June 22, 1988, four waste oil tanks were excavated and <br /> removed from the site. Two soil samples were collected from <br /> beneath each tank by Canonie Environmental Services Corp. and <br /> analyzed for TPH, benzene, toluene, xylenes and ethylbenzene <br /> (BTXE) . No concentrations of TPH or BTXE above laboratory <br /> detection limits were present in any of the samples. <br /> In March 1991, Environmental Audit, Inc. (EAT) drilled and <br /> sampled two borings (borings B-5 and B-6) at the Site to <br /> determine whether operation of the former tank systems impacted <br /> the environment (see Figure 2) • Boringn B-5 and B-6 were <br /> terminated at a depth of about 31.5 and 51.5 feet bgs, <br /> respectively. No TPH, benzene, xylenes or ethylbenzene were <br /> detected in any of the samples collected from <br /> boring <br /> o ing aromatic <br /> Toluene (ranging from 0.01 to 0.24 ppm) was <br /> Project No. 1232 -1- <br /> ErVYIR0,MA1ENTAL AUD:T,INC. <br /> F:, <br />