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' 25 September 1995 i AGE-NC Project No 95-0137 Page 5 of 6 a depth of approximately 25 feet Boring logs are included in Appendix B Organic vapors were detected in MW-4 at depths of 20 to 35 feet at concentrations up to 170 ppm Samples from boring 10 also indicated the presence of organic vapor at concentrations up to 73 ppm 44 ANALYTICAL RESULTS OF SOIL SAMPLES A total of 11 soil samples were relinquished to the laboratory for analysis BTE&X was not detected in any of the soil samples analyzed Typically, TPH-g was detected at concentrations up to 23 ppm in samples collected from depths of 15 and/or 20 feet in B 11, B 12 and B 13 Generally, the same samples contained TPH-d at higher concentrations than TPH-g TPH-d was detected at 890 and 1,900 ppm in B 11 at 20 feet and B 12 at 15 feet, respectively Analytical results of soil samples are summarized in Table 2 The laboratory report and chain-of-custody are included in Appendix D ' 4 5 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLE Both TPH-g and TPH-d were detected in the grab ground water sample collected from boring B 13 at concentrations of 6,500 and 450,000 ppb, respectively However, no BTE&X were detected in the grab samples, although the reporting limit was increased due to the high TPH concentration Analytical results of the grab ground water sample is presented in Table 3 The laboratory report and chain-of-custody are included in Appendix D 5.0. CONCLUSIONS AND RECOMMENDATIONS 51 CONCLUSIONS ' The highest concentrations of dissolved hydrocarbons in ground water are along the northern portion of the property The concentration of TPH-g is greatest in the vicinity of MW-2 while the concentration of TPH-d is greatest near MW-3 Hydrocarbon-impacted soil appears to be limited to capillary fringe or"smear" zone, immediately above the water table No petroleum hydrocarbons were detected at depths of 10 feet during this ' investigation, only very low concentrations of hydrocarbons were detected at depths of 15 feet The depth to ground water at the site is currently 19 feet