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22 April 2002 <br /> AGE-NC Project No 98-0511 <br /> Page 5 of 7 <br /> The OVM data is Included on the boring logs (Appendix C) <br /> 33 RESULTS OF SOIL SAMPLE ANALYSIS <br /> No petroleum hydrocarbon compounds were detected In any of the soil samples analyzed from <br /> borings B-5 and B-6 TPH-g was detected In soil samples B-9-20 and B-9-25 at concentrations of <br /> 630 and 0 13 milligrams per kilograms (mg/kg), respectively BTEX compounds were detected In <br /> sample B-9-20 at concentrations of 0 32 mg/kg (benzene), 4 9 mg/kg (toluene), 6 9 mg/kg <br /> (ethylbenzene) and 42 mg/kg (total xylenes) No other analytes were detected in the soil samples <br /> analysed <br /> LAnalytical results of soil samples are summarized on Table 1 Cross-sections showing the vertical <br /> and lateral extent of hydrocarbon-impacted soil are provided as Figures 5 through 8 The laboratory <br /> reports (Cal Tech Lab I D Nos 0112-002-1 through -10 and 0111-163-1 through -6), quality <br /> assurance and quality control (QA/QC) report and chain-of-custody forms are Included in <br /> Appendix B <br /> 3 4 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> IThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 14 34 feet to <br /> 15 97 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 3 06 feet in MW-6 to 3 45 feet in MW-2 relative to mean sea level The ground water at the site was <br /> Inferred to flow generally toward the northwest, varying from northwest to southwest, the gradient <br />' was low and vaned from approximately 0 002 ft/ft to 0 003 ft/ft (Figure 9) <br />' 35 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> Ground water samples collected from monitoring wells MW-1 through MW-8 and soil borings B-5, <br />' B-6 and B-9 were analyzed During sample collection, a strong hydrocarbon-like odor and <br /> hydrocarbon sheen were noted from water sample B-9-25 <br />' TPH-g was detected In the ground water samples collected from MW-1, MW-5 and MW-7 at <br /> concentrations of 12,000 micrograms per liter(µg/1), 600µg/1 and 91 µg/l respectively TPH-g was <br /> also detected in the ground water samples from B-9-25 and B-9-50 at concentrations of 270,000µg/1 <br />' and 710 µg/l, respectively <br />' advanced GeoEnvironmental,Inc <br /> I <br />