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12 October 2000 <br /> AGE-NC Project No 99-0637 <br /> Page 5 of 7 <br /> I4.0. FINDINGS <br /> Soil descriptions were utilized to construct the vertical and lateral soil model, the results of the <br /> laboratory analysis of soil and ground water samples were utilized to assess the hydrocarbon impact <br /> on the two media <br /> 41 SOIL PROFILE <br /> Generally, brown, moist, silty sand was encountered from surface grade to approximately 10 feet <br /> bsg Tan to brown, moist to saturated silty clay to clayey silt and silty sand to poorly graded sand <br /> were encountered at 15 feet and 25 feet bsg Brown, saturated silty clay, silty sand and poorly graded <br /> sand was encountered at 20 feet bsg Boring logs are included in Appendix A <br /> 4 2 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> Fault hydrocarbon odor was noted in soil samples collected from probe borings 132 and B3 at 20 feet <br /> bsg The occurrence of petroleum hydrocarbon odor are noted on the boring logs contained in <br /> Appendix A <br /> Organic vapor was detected only in the 20-foot soil sample from B2 with the PID at a concentration <br /> of 6 parts per million(ppm) Organic vapor field measurements are summarized on the boring logs <br /> contained in Appendix A <br />' 43 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of six soil samples were submitted to a DHS-certified laboratory (Alpha Analytical Inc ) for <br />' analysis as noted above MTBE was detected in the 20-foot soil sample collected from B2 at a <br /> concentration of 16 mg/kg <br />' TPH-g,TPH-d and BTEX compounds were not detected above laboratory reporting limits in the soil <br /> samples analyzed Analytical results of soil samples are summarized in Table 2 The laboratory <br /> report(Alpha Analytical Inc Lab Order No A00032103) and chain-of-custody forms are included <br />' In Appendix B <br /> 1 <br /> Advanced GeoEnviroawental,Inc <br /> 1 <br />