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r.d L..r <br /> Mr. Chris Stock 5 February 28, 1992 <br /> `~ minimum reporting limit. In addition, the analytical results for BTX&E constituents <br /> in soil indicate non-detectable concentrations for all samples analyzed at the <br /> minimum reporting limit. Results of soil analyses for the January 24, 1992 <br /> investigation are summarized in Table 1: <br /> TABLE 1. Analytical Results expressed in Parts per Million (ppm). <br /> Sample Depth I Matrix I TPH JBenzene Toluene Total Ethyl <br /> No. Xylenes Benzene <br /> ESB-1 S1 5-6.5' soil ND ND ND ND ND <br /> ` ESB-1 S3 15-16.5' soil ND ND ND ND ND <br /> ESB-2,S8 10-11.5' soil ND ND ND ND ND <br /> ESB-2 S 10 20-21.5' soil ND ND ND ND ND <br /> A L I - I - 1 100.0 0.1 10.0 62.0 68.0 <br /> ND: None Detected above minimum reporting level. <br /> NA: Not Analyzed <br /> A L: Regional Water Quality Control Board Action Level for contaminants in soil. <br /> r Based on the results of soil sampling and analysis for TPH and BTX&E, there were no <br />{ detectable concentrations of petroleum hydrocarbons in the vadose zone in the area <br /> of the existing underground storage tank. <br /> 5.0 SUMMARY AND CONCLUSIONS <br /> `" On January 24, 1992, ESE conducted a leak detection investigation at Stock's <br /> Automotive and Marine Repair Shop, in the area of an recently discovered <br /> 06•• underground storage tank located on the east side of the building. The investigation <br /> included drilling two borings to a depth of 30 feet below surface grade, laboratory <br /> analysis of four soil samples, and the writing of this report. <br /> Based on the field observations and the laboratory results, ESE did not observe <br /> detectable concentrations of petroleum hydrocarbons in the area of the underground <br /> storage tank. <br /> 6.0 RECOMMENDATIONS <br /> Based on the results of this investigation, ESE recommends that the remaining free <br /> product be removed from the underground storage tank and the tank be removed by <br /> N. <br /> EK-6014-1 9202-E 100.RPT <br />