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30 December 1999 AGE-NC Project No 95-0104 Page 5 of 7 Field measurements are summarized in Table 4 44 ANALYTICAL RESULTS OF SOIL GAS SAMPLES During the SVE pilot test, TPH-g was detected in soil gas samples collected from VW-1 at concentrations ranging as high as 2,880 ug/l BTEX compounds were detected in soil gas samples collected from VW-1 at concentrations as high ' as 240 ug/l Benzene was detected in the first three soil gas samples collected during the test at concentrations as great as 16 ug/l, but has not been detected In the last eight soil gas samples collected Analytical results of soil gas samples are summarized in Table 3 The laboratory report (Precision Enviro-Tech Analytical Laboratory Sample 1 D 's PE5851, PE5877, PE6042, PE6094, PE6145,PE6210, PE6350, PE6429, PE6492, PE6561, PE6651 and PE6674) and chain-of-custody forms are presented in Appendix D ' 45 MASS CALCULATION OF RECOVERED PRODUCT The hydrocarbon mass removed during the operating period was calculated using the following ' equation M = C•Q•t where M =cumulative mass recovered (kg) ' C = vapor concentration (kg/m') Q = extraction flow rate (m3/hr) t= operational period, in hours ' Between 27 August 1999 and 14 December 1999, the extraction unit operated a total of 2,520 hours The analytical results of the vapor samples combined with average flow rates (approximately 60 cfm) ' and the operational period were used to calculate the approximate mass of extracted gasoline during these periods ' The mass of hydrocarbons extracted from VW-I between 27 August 1999 and 14 December 1999 was calculated to be approximately 59 15 gallons The mass calculations for the pilot test are in ' Appendix E. ' 5 0. DISCUSSION AND CONCLUSIONS • Based on data collected dunng the November 1999 ground water monitoring event, AGE concludes ' Advanced GeoEn\Ironmental,Inc