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i <br /> 15 June 2004 <br /> AGE-NC Project No 95-0142 <br /> Page 8 of 12 <br /> 3.0. FINDINGS <br /> Between December 2003 and February 2004,the SVE system operated continuously at a typical rate <br /> of 200 cfm Analytical results of influent ground water samples and ground water extraction <br /> measurements were used to evaluated the volume of impacted ground water removed and mass of <br /> hydrocarbons treated <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> The SVE unit operated at varying rates during the observation period Extraction flow rates were <br /> calculated to range from 190 to approximately 200 cfm An induced vacuum(negative pressure) of <br /> approximately 64 to over 100 inches of water was measured 1n the piping between the blower and <br /> extraction wells The SVE unit operation was continuous over the quarter <br /> Hydrocarbon concentrations detected in influent soil-vapor samples were as follows <br /> • 09 December TPH-g was detected at 2,600 µg/1, benzene at 6 ltg/l, toluene at 160 µg/1, <br /> ethylbenzene at 52 gg/1 and total xylenes at 320 gg/l <br /> • 30 December TPH-g was detected at 1,200 pg/l, benzene at 2 4 gg/l, toluene at 51 gg/l, <br /> ethylbenzene at 25 gg/1 and total xylenes at 150 �ig/l <br /> • 26 January TPH-g was detected at 580 µg/1, benzene at 0 72 µg/1, toluene at 12 µg/l, <br /> ethylbenzene at 6 8 µg/1 and total xylenes at 47 µg/1 <br /> • 23 February TPH-g was detected at 200 µg/1, toluene at 0 84 µg/l, ethylbenzene at 12 gg/l <br /> and total xylenes at 27 µg/1 <br /> The analytical results are summarized on Table 2 The laboratory reports (MAI Sample Numbers <br /> 0312191,0312541,0401297 and 0402312)Quality Assurance and Quality Control(QA/QC)reports <br /> and chain-of-custody forms are included in Appendix D <br /> Hydrocarbon concentrations measured in samples from the effluent stream indicated a minimum 95 <br /> percent rate of destruction Concentrations of extracted organic vapor measured with the OVM were <br /> low compared to the analytical results from the soil-vapor samples The highest concentration of <br /> organic vapor measured with the OVM was 769 ppm, observed at startup <br /> Advanced GeoEnvironmental,Inc <br />