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' 28 May 2003 AGE-NC Project No 95-0173 ' Page 5 of 8 33,000 µg/1 (toluene, AW-2A) The maximum benzene concentration was detected from sample AW-2A at a concentration of 6,800 pg/1 ' MTBE was detected in a water sample collected from MW-5 at a concentration of 0 99 pg/l, 1,2-DCA was detected in water samples collected from MW-5 and AW-IB at concentrations of 0 95 µg/1 and 5 µg/l,respectively 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 reports (CAL reference nos 5354 and 5359)and chain- of-custody forms are presented in Appendix C 43 RESULTS OF SOIL VAPOR EXTRACTION Between 26 September 2002 and 17 December 2002, the SVE and IAS remediation systems were operational for approximately 2,102 hours(Table 7) During the operational period, SVE inlet flow rates were calculated to be approximately 98 cubic feet per minute, differential pressures were observed at approximately 3 2 inches of water, and induced vacuum between 22 and 29 inches of water Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured at concentrations as high as 2,000 parts per million (ppm) at regular intervals at the SVE inlet Field measurements are summarized in Table 6 r 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES Influent and effluent SVE air flow samples were collected on 27 September, 24 October, 12 November and 17 December 2002 TPH-g was detected in all four influent SVE air flow samples at concentrations between 530 µg/1 and 3,400 µg/1 TPH-g was detected in the September, October and November 2002 effluent air flow samples at concentrations between 61 µg/1 and 210 µg/1 Various BTEX constituents were detected in all four influent SVE air flow samples at concentrations as high as 99 µg/l (xylenes, 24 October 2002), the maximum benzene concentration was detected in the November 2002 influent sample at a concentration of 9 6 µg/l Various benzene, toluene and xylene constituents were detected in all four effluent SVE air flow samples at concentrations as high as 4 4 µg/1 xylene Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports(Castle Analytical Laboratory I D Nos 5178, 5230 and 5334) and chain-of-custody forms are presented in Appendix D A plot of laboratory analysis of SVE influent TPH-g air flow concentrations versus time is included with Appendix E • Advanced Geo Environmental,Inc I