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13 December 2004 <br /> • AGE-NC Project No 99-0645 <br />' Page 5 of 7 <br />' 03 November TPH-g was detected from the Influent SVE samples at a concentration of 2,000 µg/l, <br /> the BTEX compounds toluene,ethylbenzene and xylenes were detected at concentrations of 26 µg/l, <br /> 32µg11 and 300 gg/1µg11,respectively,and MTBE was detected at a concentration of 77 µg/l TPH-g <br />' and BTEX compounds were not detected in the effluent SVE sample, but MTBE was detected at a <br /> concentrations of 22 µg/l <br />' 17 November TPH-g was detected from the Influent SVE samples at a concentration of 500 gg/l, <br /> the BTEX compounds toluene,ethylbenzene and xylenes were detected at concentrations of 7 3 pg/l, <br /> 9 7 µg/1 and 92 µg/1, respectively, and MTBE was detected at a concentrations of 76 µg/1 COCs <br />' were not detected in the effluent SVE sample <br /> The analytical results are summarized in Table 5 The laboratory reports(C TEL Project Nos CT214- <br /> I 0410029,-0410078,-0410132,-0411129 and MAI Work Order 0411074)quality assurance/quality <br /> control (QA/QC) reports and chain of custody forms are included in Appendix C <br />' Extracted organic vapor concentrations measured with the OVM were similar when compared to the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor measured <br />' with the OVM was 15 ppm <br />' 3 2 MASS OF RECOVERED HYDROCARBONS <br /> The hydrocarbon mass (TPH-g) removed during the operating period was calculated using the <br />' following equation M = C•Q•t <br /> where 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 /> tThe estimated mass of hydrocarbons removed was based on laboratory analysis of soil-vapor <br /> samples,the flow rate and operational time The mass of extracted hydrocarbons was calculated for <br />' the time period using average hydrocarbon concentrations of influent soil-vapor sample data, <br /> averaged air flow rates and duration of operation The operational results are summarized in Table 4 <br />' Approximately 360 kg (794 pounds) or 127 gallons of hydrocarbons were extracted and adsorbed <br /> by the SVE system between 05 October and 17 November 2004 The volume and mass calculations <br /> are attached in Appendix D <br /> • <br />' Advanced GeoEnvironmental,Inc <br />