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i r02 June 2005 • AGE-NC Project No 95-0130 Page 6 of 13 ' Following sample collection, the samples were properly labeled, placed in a covered container and transported under chain of custody to Cal Tech Environmental Laboratories, a DHS-certified laboratory in California Each sample was analyzed within 72 hours of collection for TPH-g,BTEX ' and MTBE in accordance with EPA Methods 8015M and 8020/8021 ' 3 3 SOIL VAPOR EXTRACTION REMEDIATION FINDINGS From field and laboratory data collected at the SVE remediation system between 22 December 2004 ' and 08 March 2005,AGE determined the average TPH-g concentration, the average flow rate and calculated the approximate mass and volume of hydrocarbons removed ' 3 3 1 RESULTS OF SOIL VAPOR EXTRACTION IBetween 22 December and 08 March 2005, the SVE remediation system was operational for approximately 1,824 hours (Tables 6 and 7) During this operational period, SVE inlet flow rates were observed to average approximately 59 cubic feet per minute, from a differential pressures 10 observed at approximately 14 inches of water Utilizing a photo ionization meter(PID),hydrocarbon concentrations were measured at concentrations as high as 1,989 parts per million(ppm) at regular ' intervals at the SVE inlet Field measurements are summarized in Table 6 ' 3 3 2 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES Influent and effluent SVE air flow samples were collected on 20 January,21 February and 08 March 2005 TPH-g was detected in all three influent SVE air flow samples at concentrations as high as 12,000 µg11 TPH-g was also detected in all three of the above effluent air flow samples at concentrations as high as 1,100 µg11 BTEX constituents were detected in all three influent SVE air flow samples at concentrations as high as 160 µg11 benzene, 540 µg11 toluene, 90 µg11 ethylbenzene and 410 µg/1 xylenes Low concentrations of BTEX constituents were detected in the above effluent SVE air flow samples at concentrations as high as 15 µg/l benzene,90µg11 toluene,28µg11 ethylbenzene and 60µg/1 xylenes MTBE was detected in the February and March 2004 influent SVE air flow samples at concentrations of 110 µg11 and 45 µg/1, respectively, MTBE was not detected in any of the above effluent air flow samples . Analytical results of SVE air samples are summarized in Table 5 GeoTracker confirmation pages Advanced GcoEnvironmental,Inc 1