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10 March 1998 ' <br /> AGE-NC Project No 95-0135 <br /> IPage 7 of 9 <br /> i L <br /> I of 920 parts per million (reported as milligrams per kilograms mg/Kg) <br /> 1 <br /> Soil samples B5-14/15 and B5-65 contained detectable TPH-g at concentrations of 1,500 and 14 <br /> ` ppm, respectively Soil sample B6-35 also had detectable TPH-g at a concentration of 2 5 ppm <br /> BTE&X compounds were detected in the same soil samples at concentrations up to 88 ppm of <br /> xylene Benzene'was not detected in the soil samples _ <br /> DIPE was detected in two of the soil samples analyzed DIPE was detected in samples B5-50 and <br /> B5-65 at concentrations of 18 and 6 ppm, respectively MTBE, TBA, ETBE and TAME were not <br /> detected in the soil samples Y _ <br /> Volatile organic compounds (VOCs)were detected in soil samples collected from boring B4 at " <br /> f depths of 43 to 70 feet bsg The highest concentration of VOCs was detected in soil sample B4-63 <br /> e VOCs were detected in the soil samples collected from boring B5, with soil sample 135-14/15 <br /> contained highest concentrations of VOCs Sample B5-50 contained 1,3,5-trimethylbenzene and, ' <br /> xylene at trace concentrations VOCs were not detected in the soil samples collected from boring 136 <br /> Analytical results of soil samples are summarized in Table 1 -Analytical Results of Soil Samples- <br /> 10 Analyzed by EPA methods 8015 and 8020 and in Table 2 -`Analytical Results of Soil Samples - <br /> Analyzed by EPA methods 826018260m <br /> The laboratory report(MAI Laboratory ID 78014 through 78024 and 80764 through 80778), QA/QC <br /> reports and chain-of-custody are in Appendix E <br /> ti <br /> 4 3" GROUND WATER ELEVATION AND GRADIENT <br /> The ground water elevation in each well was calculated by subtracting the depth to'ground water <br /> I from the surveyed casing elevations (Table 4), <br /> Ground water gradient on 24 September 1997 was calculated to be an average of 0 01 foot/foot <br /> r directed toward the northeast The contoured ground water elevation data from the site is illustrated <br /> in Figure 3 - Relative Ground Water Elevation <br /> ` 4 4 ' LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g,toluene,ethylbenzene and xylenes were detected in all water samples Benzene was detected <br /> 1. in all water samples except MW-3B The highest concentrations of hydrocarbons were detected in <br /> wells MW-1 located near the western edge of the property,north of the former dispenser at the site <br /> Advanced GeoEnvironmentel,Inc <br />