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i 29 December 2004 • AGE-NC Project No 95-0130 Page 6 of 10 I33 SOIL VAPOR EXTRACTION REMEDIATION FINDINGS From field and laboratory data collected at the SVE remediation system between 31 August and 01 October 2004, AGE determined the average TPH-g concentration, the average flow rate and calculated the approximate mass and volume of hydrocarbons removed I3 3 1 RESULTS OF SOIL VAPOR EXTRACTION I Between 31 August and 01 October 2004, the SVE remediation system was operational for approximately 744 hours(Tables 6 and 7) During this operational period, SVE inlet flow rates were observed to average approximately 18 cubic feet per minute, from a differential pressures observed I at approximately 0 1 inches of water Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured at concentrations as high as 5,127 parts per million (ppm)at regular intervals at the SVE inlet Field measurements are summarized in Table 6 I 3 3 2 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES .f.� samples and effluent uent SVE air flow les were collected on 31 August, on 22 September and on p 01 October 2004 TPH-g was detected in all three influent SVE air flow samples at concentrations as high as 98,000µg/1 TPH-g was also detected in all three effluent air flow sample at concentrations as high as 1,100 µg/1 ' BTEX constituents were detected in all three influent SVE air flow samples at concentrations as high as 1,400 µg/1 benzene, 5,500 µg/1 toluene, 690 µg/1 ethylbenzene and 3,100 µg/l xylenes Low concentrations of BTEX constituents were detected in effluent SVE air flow samples at concentrations as high as 15 µg/l benzene,88 µg/1 toluene, 10µg/1 ethylbenzene and 40µg/l xylenes I MTBE was detected in the August and September 2004 influent SVE air flow samples at concentrations of 520 µg/1 and 130 gg/l, respectively, MTBE was not detected in any of the three effluent air flow samples IAnalytical results of SVE air samples are summarized in Table 5 The laboratory reports (CTEL Project Nos CT214-0409004, 0409142 and 0410013) and chain of custody forms are presented in ' Appendix F A plot of laboratory analysis of SVE influent TPH-g air stream concentrations versus time is included with Appendix E GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix D I i IAdvanced GeoEnvironmental,Inc