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-� 2 BACKGROUND <br /> The San Joaquin County Motor Pool is located at 444 South Wilson Way, Stockton, <br /> California(Plate 1, Vicinity Map). The facility operated two underground waste oil storage <br /> , t <br /> tanks at two locations on the site. A 1000 gallon tank was located south of the tire shop <br /> and a 500 gallon tank was located north of the auto repair shop. The locations of the tanks <br /> and buildings are shown on the Site Plan,Plate 2. <br /> 1 3 <br /> The two waste oil storage tanks were excavated and removed in May, 1988. The 500-gallon <br /> tank excavation was backfilled to grade and the 1000-gallon tank excavation was partially <br /> s, backfilled. During the tank removal, two soil samples were collected from the bottom of <br /> each tank excavation and submitted for chemical analysis. Samples were collected at a <br /> detank excavation, and at a depth of 16 feet from the <br /> 1000-gallon tank excavation. A total petroleum hydrocarbons (TPH) extractable was <br /> ~W detected at 26 m k ;n one of the t,,rro samples collected from the 500-gallon tank <br /> " excavation, and TPH conc ntrations of�20 and 320 mg/kg were detected in the two <br /> samples coil acted from.the tank excavation. Benzene, toluene, ethyl benzene, <br /> and xylene (BTEX); polychlorinated biphenvis (PCBs); and purgeabie halocarbons were <br /> not detected in samples collected from both excavations <br /> San Joaquin County Public Health Services, Environmental Health Division requested <br /> additional assessment of the extent of possible contamination. San Joaquin County <br /> Department of General Services retained Kleinfelder to conduct a limited soil assessment . <br /> investigation to evaluate the lateral and vertical extent of soil contamination in the vicinity <br /> of the former wast oil tanks. A work plan to conduct the assessment was submitted to <br /> Public Health Service in April, 1989. The work- plan was revised to address Public Health <br /> Service's comments and an approved boring permit was received on July 28, 1989. <br /> Kleinfelder conducted a field investigation to further assess the extent of contamination in <br /> --November 798y.-This report describes Elie field activities and analytical results associated <br /> with the soil assessment investigation. <br /> 4, <br /> 241-89-2196 2 <br />