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12 January 1998 <br /> AGE-NC-95-0. 103 <br /> ' - Page 5 of 7- <br /> t <br /> ' - indicated that concentrations were lower by at least 10 percent of the values quantified by EPA <br /> method 8020-MTBE and the other four oxygenating fuel additive compounds were not detected soil <br /> vapor samples <br /> t " <br /> TPH-g was detected in the 26 November 1997 sample collected from influent vapor stream at <br /> concentrations of 1,100 ppb BTE&X were detected at concentrations as high as 29 ppb (xylene) <br /> ' However, BTE&X confirmation by EPA method 8260 indicated that concentrations were lower by <br /> -at least 10 percent from the concentrations determined by EPA method 8020 Oxygenating fuel <br /> additive compounds were not detected in the soil vapor samples <br /> u The analytical results of soil vapor samples are summarized on Table 5 The laboratory report(MAI <br /> ' Lab No 82179-82180 and 83400-83401 ), Quality Assurance and Quality Control (QAIQC)reports <br /> and chain-of-custody forms are included in Appendix D <br /> Concentrations of extracted volatile organic compounds measured with the organic vapor meter <br /> equipped with a photo ionization (PID) correspond to approximately one-fifth of the analytical <br /> results obtained from the influent stream samples Analytical data collected before the catalytic <br /> oxidizer and the effluent stream indicate a greater than 99 percent rate of destruction <br /> 35 MASS OF RECOVERED HYDROCARBONS <br /> The hydrocarbon mass removed during the operating period was calculated using the following <br /> equation M = C•Q•t <br /> where M =cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m3) - <br /> Q =extraction flow rate (m3/hr) <br /> t=operational period, in hours <br /> The operational time over the last quarter was estimated to be 75 full days The mass of <br /> hydrocarbons removed was based on laboratory analysis of two soil gas samples collected and <br /> analyzed The mass of extracted hydrocarbons was calculated for the period using the average <br /> hydrocarbon concentrations determined from the influent vapor samples collected and the average <br /> ' air flow rate <br /> An estimated total of 73 gallons of hydrocarbons quantified as gasoline were removed from the site <br /> 1 The mass calculations are attached in Appendix E <br /> � � r <br /> Advanced GeoEnvironmental,Inc <br />