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1 <br /> 27 February 1997 <br /> AGE-NC-95-0112 <br /> ' Page 4 of 5 <br /> 3 4 HYDROCARBON-IMPACTED SOIL REMEDIATION <br /> The mass of hydrocarbons extracted from MW-1 and RW-1 between 30 October and 20 December <br /> ' 1996 was calculated to be approximately 106 kg or 234 lbs A gallon of gasoline weighs <br /> approximately 6 25 lbs The approximate volume of hydrocarbons as gasoline removed during this <br /> operational period is 37 3 gallons This brings the total volume of hydrocarbons removed from the <br /> soil since initiation of the SVE system up to approximately 1,597 gallons The mass calculations for <br /> the current quarter are attached in Appendix D <br /> The analytical result for one soil sample collected on 31 July 1996 was reported incorrectly by the <br /> laboratory Examination of the chromatograms indicated that sample P240 contained TPH-g at a <br /> concentration of 13,000 ppm, rather than 1,200 ppm as previously reported Concentrations of <br /> BTE&X were reported correctly No other changes were made to this laboratory report The revised <br /> laboratory report(AAL batch No 96-0806-006)and chain-of-custody form are included in Appendix <br /> E <br />'. 4 0 CONCLUSIONS & RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> Based upon data collected from the site, AGE has the following conclusions <br />' • Petroleum hydrocarbons were not detected in the ground water sample collected from MW-1 <br /> during the January 1997 monitoring event Hydrocarbon concentrations have shown a steady <br /> decrease at the site since installation of the extraction/sparging system <br />' • MTBE was detected in the sample collected from MW-7 MTBE had not been previously <br /> detected at the site and is an anomaly Petroleum hydrocarbons were not detected in any of <br />' the remaining monitoring wells during the January 1997 monitoring event <br /> • Concentrations of extracted hydrocarbon vapor continued to show a slight decrease from <br />' previous monitoring quarters <br />' 42 RECOMMENDATIONS <br /> Based upon data collected at the site, AGE has the following recommendations <br /> . Due to the low concentrations of extracted hydrocarbons and high rate of consumption of <br /> 1 <br />