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Cu 31 October 2003 AGE-NC Project No 95-0173 Page 5 of 8 C), AW-1 (A and B) and AW-2 (A and B) at concentrations as high as 79,000 micrograms per liter (µg/l) in the sample from AW-2A Various BTEX constituents were detected in ground water samples collected from the same wells at concentrations as high as 16,000µg/1(xylene,AW-2A) The maximum benzene concentration was detected from sample AWAA at a concentration of 3,000 µg/1 MTBE was detected in a water sample collected from AW-2B at a concentration of 0 53 µg/1, 1,2-DCA was detected in water samples collected from MW-3, MW-5, AW-1B and AW-2A at concentrations as high as 4 9 µg/1 TBA was detected in a water sample collected from well MW-3 at a concentration of 14 µg/1 No other fuel components were detected in the samples analyzed Previous and current analytical results of ground water monitoring well samples are summarized in Tables 3 and 4, respectively The laboratory report (MAI work order no 0306526) and cham-of custody forms are presented in Appendix C 43 RESULTS OF SOIL VAPOR EXTRACTION Between 20 March 2003 and 23 June 2003, the SVE rcmediation systems were operational for approximately 1,767 hours (Tables 6 and 7) The IAS system cycled or operated contemporaneously with the SVE system During the operational period, SVE inlet flow rates were calculated to be approximately 105 cubic feet per minute, from a differential pressures observed at approximately 4 2 inches of water, and induced vacuum between 28 and 38 inches of water Utilizing a photo ionization meter(PID), hydrocarbon concentrations were measured at concentrations as high as 86 parts per million(ppm)at regular intervals at the SVE inlet Field measurements are summarized in Table 6 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES Influent and effluent SVE air flow samples were collected on 16 April, 15 May and 23 June 2003 TPH-g was detected in all three influent SVE air flow samples at concentrations of 190 µg/1, 41 µg/1 and 200 µg/1, respectively TPH-g was not detected in any of the above effluent air flow samples Various BTEX constituents were detected in the April and June influent SVE air flow samples at concentrations as high as 7 4 µg/1 (xylenes, 23 June 2003), benzene was not detected in any influent/effluent samples BTEX constituents were not detected in any of the three effluent SVE air flow samples Advanced GeoEnvironmental,Inc I