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c <br /> I y i 1 F L <br /> 09 March 2005 <br /> AGE-NC Project No 95-0121 <br />' Page 4 of 7 <br /> 3 1 SOIL VAPOR EXTRACTION <br /> I <br /> Between 22 June and 22 December 2004, the SVE unit operated for approximately 4,392 hours t <br />' Extraction flow rates ranged from 47 cubic feet per minute(cfm)to72 cfm SVE system monitoring <br /> data is presented in Table 2 <br />' Hydrocarbon concentrations detected in influent soil vapor samples were as follows <br /> • 22 July 2004 TPH-g, BTEX and MTBE were not detected in the influent vapor sample <br />' • 31 August 2004 TPH-g was detected at 990 micrograms per liter(µg/1),benzene at 6 2 µg/1, s <br /> toluene at 25 µg/l, ethylbenzene at 5 2 µg/1, and total xylenes at 19 µg/1 <br /> I • 22 September 2004 TPH-g was detected at 1,000 pg/1, benzene at 5 4 µg/1, toluene at <br /> 34 µg/l, ethylbenzene at 12 µg/1, and total xylenes at 39 µg/1 , <br />' 25 October 2004 TPH-g was detected at 93 µg/l,benzene at<0 5 µg/1,toluene at 0 71 µg/1, <br /> total xylenes at 4 4 µg/1 and MTBE at<0 5 µg/1 <br /> • 22 November 2004 TPH-g, BTEX and MTBE were not detected in the influent vapor <br /> sample <br /> • 22 December 2004 TPH-g was detected at 340 µg/1 and total xylenes at 9 0 µg/1 <br /> I ' <br /> Soil vapor analytical data is summarized in Table 4 The laboratory reports (CTEL Project Nos <br /> CT214-0407161,-0409002,-0409146,-041169,and-0412188 and CAL Lab No 7493-1 V),quality <br /> assurance/quality control(QA/QC)reports,and chain of custody forms are included in Appendix C <br /> I3 2 MASS OF RECOVERED HYDROCARBONS <br /> I The mass of hydrocarbons removed was based on analysis of soil vapor samples The mass of <br /> extracted hydrocarbons was calculated using monthly average hydrocarbon concentrations,of influent <br /> soil vapor sample data and average air flow rates <br /> IApproximately 382 6 pounds of TPH-g were extracted from the SVE network between 22 June and <br /> 22 December 2004 The mass-volume calculations are included in Appendix D <br /> Y <br /> o <br /> L <br /> _ i s <br /> 3 3 GROUND WATER MONITORING RESULTS <br /> L L <br /> • 'The depths to ground water in wells MW-1 through MW-9 ranged from 17 33 feet to 19 69 feet <br /> I 4 � <br /> Advanced GeoEnvironmental,Inc <br /> iL <br /> L <br />