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04 January 1999 <br /> AGE-NC Project No. 95-0100 <br /> Page 4 of 5 <br /> The operational time was divided into three time periods. The mass of hydrocarbons removed was <br /> based on analytical results of soil gas/vapor samples. The mass of extracted hydrocarbons was <br /> calculated for each time period using average hydrocarbon concentrations of influent soil gas/vapor <br /> samples and average air flow rates. <br />' Approximately 25 gallons of gasoline were calculated to have been removed between June and July, <br /> 20 gallons of gasoline were extracted between July and September and 14 gallons of gasoline were <br /> extracted between September and the end of October 1998. <br /> Total of 60.5 gallons of gasoline were removed from the site over the last quarter. While the total <br /> of TPH as gasoline removed is 433.5 gallons. The mass calculations are attached in Appendix B. <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site,AGE concludes: <br /> The highest concentrations of petroleum hydrocarbon soil gas/vapor detected were produced <br /> during the July sampling of the SVE operation. <br /> Approximately 59.9 gallons of gasoline were removed from the site during the third and <br /> portions of the forth quarter of 1998 and to date 432 gallons of TPH as gasoline have been <br /> removed from the site. <br />' 5.0. RECOMMENDATIONS <br /> Based upon data collected at the site, AGE recommends that: <br /> • Obtain soil samples from the site to assess the effectiveness of the SVE extraction. <br /> . <br /> • Continue operation and monthly monitoring of the SVE system to reduce the mass of <br /> contaminants at the site, if continued remediation of the site is determined to be necessary. <br /> • Convert the soil gas/vapor extraction unit to carbon canister absorption from thermal <br /> destruction;.if cost-effective. _� <br /> Advanced GeoEnviron mental,Inc. <br /> 1 <br />