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I 19 July 2002 • AGE-NC Project No 95-0173 Page 5 of 8 MTBE was detected in water samples collected from MW-5 and MW-11 at concentrations as high as 0 65,ug/l(MW-5) 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 I 4, respectively, the estimated extent of dissolved petroleum hydrocarbons is depicted in cross sectional view C-C' (Figure 5) The laboratory reports (CAL Reference No 4487) and chain-of- custody forms are presented in Appendix C 43 RESULTS OF SOIL VAPOR EXTRACTION Between 31 December 2001 and 29 March 2002, the SVE and IAS remediation systems were operational for approximately 1,975 hours (Table 7) During the operational period, SVE inlet flow rates ranged from 80 to 98 cubic feet per minute, differential pressures ranged between 2 4 and 3 2 inches of water, and induced vacuum between 28 and 34 inches of water Utilizing a photo ionization meter(PID), hydrocarbon concentrations were measured between 14 and 72 parts per million (ppm) Iat regular Intervals at the SVE Inlet Field measurements are summarized in Table 6 lie 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES SVE air flow samples were collected on 10 January, 18 February and 11 March 2002 TPH-g was detected In all three influent SVE air flow samples at concentrations as high as 800µg/l, TPH-g was detected In the March 2002 effluent SVE air flow sample at a concentration of 150 4g/1 IBTEX compounds were detected in all three influent SVE air flow samples at concentrations as high as 68 µg/l (xylenes, 10 January 2002) The maximum benzene concentration was detected in the 11 March 2002 at a concentration of 1 8µg/l, BTEX constituents were detected in all three effluent SVE air flow samples at concentrations as high as 23,ug/l xylenes Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports (McCampbell Analytical Laboratory I D Nos 88127-28, 90618-19 and 0203202-03) 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 r 4 5 MASS CALCULATION OF RECOVERED PRODUCT ■ The hydrocarbon mass removed during the SVE operating period was calculated using the equation M = C•Q•t where M = cumulative mass recovered (kg) Advanced GeoEnvironmental,Inc