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21 March 2006 <br /> AGE-NC Project No 97-0290 <br /> Page 13 of 15 <br /> I83 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> The OVM detected organic vapor above background levels in all of the soil sample duplicates from <br /> boring B 101 The highest organic vapor concentrations detected were from samples B101-20 and <br /> B 101-3 5 at 448 ppm and 269 ppm, respectively Additionally,a strong petroleum hydrocarbon-like <br /> odor was detected in samples B 101-20 and B 101-25,and a faint hydrocarbon-like odor was detected <br /> IIn samples B101-40 through B l O I-55 Saturated soil was encountered at 55 feet bsg <br /> 84 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> TPH-g was detected In soil samples collected from boring B101 at 15 feet, 20 feet, 50 feet, and <br /> 55 feet bsg at maximum concentrations of 400 mg/kg in sample B101-20 <br /> BTEX compounds were detected in the soil samples collected from boring B 101 at 15 feet,20 feet, <br /> 35 feet, 50 feet, and 55 feet bsg at maximum concentrations of 0 05 mg/kg benzene, 1 7 mg/kg <br /> toluene, 2 1 mg/kg ethylbenzene, and 27 mg/kg total xylenes in sample B101-20 <br /> TPH-g was detected in soil samples collected from boring B102 at 20 feet and 50 feet bsg at a <br /> maximum concentration of 160 mg/kg in sample B 102-20 BTEX compounds were detected in the <br /> soil samples collected from boring B102 at 20 feet, 50 feet, and 55 feet bsg at maximum <br /> concentrations of 0 06 mg/kg benzene, 0 92 mg/kg ethylbenzene, and 3 8 mg/kg total xylenes, <br /> detected In sample B 102-50 <br /> EMTBE was not detected in the soil samples analyzed <br /> Analytical results are summarized in Table 1, a comparison of the current analytical results with <br /> previous soil borings Is Included in Table 4 Geologic cross-section A-A' was constructed to depict <br /> the extent of adsorbed petroleum hydrocarbon contamination post-remediation (Figure 5) The <br /> laboratory reports (CTEL Project Nos CT214-0601145 and-0601169), QA/QC reports, and chain <br /> of custody forms are included in Appendix E GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are Included in Appendix D <br /> 9.0. CLOSURE SUMMARY AND CONCLUSIONS <br /> IBased on the data collected from the site, AGE concludes <br /> • At the time of the January 2006 monitoring event, ground water flow was inferred to be <br /> towards the south and southwest, which Is consistent with historical ground water flow <br /> Advanced GeoEuvironmental,Inc <br />