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4.0 CONCLUSIONS <br /> r <br /> Both field and laboratory analytical results from the three soil borings clearly indicate that the August <br /> 1999 overexcavation of the fuel dispenser area down to about 14 feet in depth successfully <br /> remediated diesel-range hydrocarbons previously identified during UST removal activities in January <br /> 1999 at shallower depths beneath the removed fuel dispenser. The only detectable hydrocarbon <br /> encountered in any of the nine soil samples collected was 2.0 milligrams per kilogram (mg/kg) <br /> detected in the downgradient boring IB-2 at a depth of about 7.5 feet below surface. A review of the <br /> laboratory chromatogram for this analysis, which is included in the laboratory data report in <br /> Appendix C of this report,shows that this positive detection is not typical diesel,but rather a heavier <br /> hydrocarbon. <br /> 5.0 RECOMMENDATIONS <br /> Based on results of this investigation, we recommend that the San Joaquin County Public Health <br /> Services,Environmental Health Division grant regulatory closure for this site. Results from previous <br /> soil sampling after removal of the diesel UST showed no significant releases from the UST system <br /> itself In addition, results from this investigation show that releases identified at shallow depth <br /> beneath the former fuel dispenser were adequately overexcavated and do not pose an environmental <br /> risk. <br /> i <br /> L� <br /> GRI B I Associates Pape 5 REPORT OF SOIL BORING INVESTIGATION <br /> Page REID PLASTICS UST SITE I GA 172-OI-01 <br />