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1 <br /> 26 October 2004 <br /> AGE-NC Project No 97-0290 <br />' Page 5 of 6 <br />' • The Influent soil-vapor sample collected on 19 August had no detectable concentration of <br /> TPH-g, BTEX compounds nor MTBE <br /> • The soil-vapor sample collected on 16 September contained detectable concentrations of <br />' TPH-g at 200 µg/1 and BTEX compounds at 4 1 µg/1 toluene, 1 7 µg/1 ethylbenzene and 13 <br /> µg/1 total xylenes MTBE was not detected <br />' No other analytes were detected at or above laboratory reporting limits in the samples submitted for <br /> analysis The analytical results are summarized in Table 6 The laboratory reports(MAI Work Order <br />' 0401172 and CTEL Project Nos CT214-0402140, -0403189, -0404206, -0405173, -0406211, <br /> -0407160, -0408133 and -0409108), QA/QC reports and chain of custody forms are Included in <br /> Appendix D <br /> 1 <br /> 34 SOIL-VAPOR EXTRACTION <br />' The carbon-based SVE system operated between 30 December 2003 during the fourth quarter 2003 <br /> and 16 September 2004 The hydrocarbon mass (TPH-g) removed during the operating period was <br /> calculated using the following equation M = C•Q•t where <br />' M = cumulative mass recovered (kg) <br /> C = soil-vapor concentration (kg/m') <br /> Q =extraction flow rate (M3/hr) <br />' t=operational period, in hours <br /> The calculated mass of hydrocarbons removed was based on laboratory analysis of soil-vapor <br />' samples The mass of extracted hydrocarbons was calculated using average hydrocarbon <br /> concentrations of influent soil-vapor sample collected between 30 December 2003 to <br /> 16 September 2004 and the average air flow rates at the dates A calculated total of 534 lbs of <br />' gasoline (TPH-g) was removed during the three quarter of 2004 Operational parameters are <br /> presented in Table 5 The volume/mass calculations are presented in Appendix E <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds <br /> • On 09 September the depth to ground water was within the well screens at the site and off <br /> of the site, while the ground water flow direction modeled south to southwest, which is <br /> consistent with historical ground water flow directions <br />' Advanced GeoEnviron mental,Inc <br /> 1 <br />