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' 05 May 2005 <br /> AGE-NC Project No 99-0645 <br /> Page 4 of 6 <br /> xylene and MTBE was detected at a concentration of 35 gg/l TPH-g was not detected in the effluent <br /> SVE sample, 14 gg/l toluene and 5 µg/l xylene were detected in the effluent SVE sample, MTBE <br /> was not detected <br /> 16 February TPH-g was detected from the influent SVE sample at a concentration of 820 µg11, <br /> BTEX compounds were detected at 11 gg/l benzene and 23 gg/l toluene, and MTBE was detected <br />' at a concentration of 180 gg/l Contaminants of concern (COCs) were not detected in the effluent <br /> SVE sample <br />' 08 March TPH-g was detected from the influent SVE sample at a concentration of 650 µg11, BTEX <br /> compounds were detected at 36 µg11 toluene, 2 2 µg11 ethylbenzene and 12 µg11 xylene, MTBE was <br /> detected at a concentration of 7 6 µg/1 TPH-g was detected in the effluent SVE sample at a <br />' concentration of 110 µg11 and the BTEX compounds toluene and xylene were detected at <br /> concentrations of 7 5 µg/1 and 5 2 µg/1, respectively, MTBE was not detected <br /> 23 March COCs were not detected in the effluent SVE sample <br /> The analytical results are summarized in Table 2 The laboratory reports(CTEL Project Nos CT214- <br /> i. 0412192, 0501132, 0502102, 0503081 and 0503243) quality assurance/quality control (QA/QC) <br /> reports and chain of custody forms are included in Appendix C <br />' Extracted organic vapor concentrations measured with the OVM were one quarter to one half of the <br /> values when compared to the analytical results from the soil-vapor samples The highest <br /> concentration of organic vapor measured with the OVM was 247 ppm (February) <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 (kglm3) <br /> Q = extraction flow rate (m3/hr) <br /> t= operational period, in hours <br /> The 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,average <br /> air flow rates and duration of operation The operational results are summarized in Table 1 <br />' Advanced GeoEnvironmental,Inc <br /> I <br />