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1.0 INTRODUCTION <br /> This report presents the results of soil sampling and two rounds of groundwater sampling <br /> conducted in 1996 at the San Joaquin County Mosquito and Vector Control District facility <br /> located at 200 North Beckman, Lodi, California Soil and groundwater analytical data from <br /> previous investigations are also incorporated into this report <br /> In 1986, three underground storage tanks (USTs) were removed from the site and soil was <br /> excavated from beneath the USTs to a depth of 31 ft below ground surface (bgs) As a result <br /> of the discovery of petroleum hydrocarbons in soil beneath the tanks a soil and groundwater <br /> investigation was conducted in 1987 The 1987 investigation consisted of the completion of six <br /> soil borings and the installation of three groundwater monitor wells Petroleum hydrocarbons <br /> were detected in soil to a depth of 31 ft but were not detected in groundwater <br /> IIn December 1991 a quarterly groundwater sampling program was begun at the facility At the <br /> beginning of the quarterly groundwater sampling program only MW-1 contained enough water <br /> lto sample Therefore, another well (MW-4) was installed Groundwater samples were collected <br /> through January 1993 Petroleum hydrocarbons were not detected in groundwater during the <br /> sampling program <br /> In July 1994 an additional soil and groundwater investigation was conducted Soil samples were <br /> collected from three borings Grab groundwater samples were collected from two of the <br /> bonngs Petroleum hydrocarbons were detected in soil to a depth of 50 ft Petroleum <br /> hydrocarbons were not detected in groundwater, however, a groundwater sample was not <br /> collected from the boring (SB-2) with the highest concentrations of petroleum hydrocarbons in <br /> soil <br /> The current investigation was conducted to determine groundwater quality in the vicinity of <br /> boring SB-2. <br /> L 5PR01EC1'SISANJ0QSSJCL0D[REP <br /> 1 !&wary 1997 <br />