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