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I lie 26 October 2001 AGE-NC Project No 01-0839 Page 6 of 8 in boring B-1, and silty sand was encountered at 50 and 55 feet bsg in boring B-3 Boring logs are included in Appendix A A line of cross section is illustrated on Figure 2 and a geologic cross section is depicted on Figure 3 Hydrocarbon odor was observed in soil samples from bonngs B-1 and B-2 Organic vapor was detected in the soil samples collected from borings B-1 and B-2 at concentrations as high as 1,022 parts per million (131-20) Organic vapor field measurements are included on the boring logs in Appendix A 42 ANALYTICAL RESULTS OF SOIL SAMPLES TPH-g was detected 1n soil samples collected from bonngs B-1 and B-2 between 20 feet and 80 feet bsg at concentrations as high as 2,500 (milligrams per kilogram) mg/kg One or more BTEX compounds were detected in the same samples at concentrations as high as 0 020 mg/kg benzene, 0 39 mg/kg toluene, 16 mg/kg ethylbenzene and 160 mg/kg total xylenes MTBE was detected by EPA Method 8020 in the 40-foot sample from B-1 and in the 50-foot sample collected from B-2 at concentrations of 0 15 mg/kg and 0 055 mg/kg, respectively MTBE was confirmed in the same samples and detected in the 30-foot soil sample from boring B-1 by EPA Method 8260 at concentrations of 130 (micrograms per kilogram) gg/kg, 33 gg/kg and 30 gg/kg, respectively 1,2-DCA was detected in the 50-foot soil sample collected from B-2 at a concentration of 9 6 gg/kg No other fuel additives were detected in the soil samples The approximate extent of impacted soil is depicted in cross-sectional view in Figure 3 Analytical results of soil samples are summarized in Table 2 The laboratory report(MAI Lab I D 77625 through 77640) and chain-of-custody are included in Appendix B 43 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the ground water sample collected from bonngs B-2 and B-3 at concentrations of 8,300 micrograms per liter (µg/1) and 350 µg/1, respectively BTEX compounds were detected in the ground water samples at concentrations as high as 8 5 µg/1 benzene, 150 gg/l toluene, 120 gg/1 ethylbenzene and 1,300 µg/1 total xylenes Dissolved MTBE was detected in the groundwater sample collected from B-2 at a concentration of 29 gg/1 utilizing EPA Method 8020 and confirmed at a concentration of 22 µg/1 utilizing EPA Method 8260 MTBE was detected by EPA Method 8260 in the water sample collected from B-3 at a concentration of 2 0 gg/1 1,2-DCA was detected in the sample collected from boring 13-2 at a concentration of 6 2 µg11 Advanced GeoEnvtronmental,Inc