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26 February 2004 <br /> AGE-NC Project No 98-0448 <br /> Page 7 of 10 <br /> 54 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> During the fourth quarter 2003, SVE air flow samples were collected on 09 October, on 18 <br /> I November and on 29 December 2003, additionally, at the conclusion of the rebound response test, <br /> an SVE air flow sample was collected on 28 January 2004 TPH-g was detected between 50µg/l and <br /> 810 µg/1 from the influent SVE air flow samples collected in October, November and December <br /> 2003 TPH-g was not detected above laboratory reporting limits in the influent air flow sample <br /> collected in January 2004 <br /> I One or more BTEX compounds were detected in the influent SVE air flow samples collected in <br /> October,November and December 2003 Benzene was detected in the influent SVE air flow sample <br /> collected in November and December 2003 at concentrations of 2 2 µg/1 and 0 87 µg/l,respectively <br /> I Toluene was detected in November and December 2003 at concentrations of 26 µg/1 and 1 5 µg/1, <br /> respectively Ethylbenzene was detected in October 2003 at a concentration of 1 8 µg/1 Xylenes <br /> were detected in November and December 2003 at concentrations of 19 µg/1 and 3 7 µg/1, <br /> respectively <br /> Analytical results of SVE air flow samples are summarized in Table 6 The laboratory reports <br /> lie (McCampbell Analytical Inc Work OrderNos 0310161,0311252 and Castle Analytical Laboratory <br /> Reference No 6479 and 6581) and chain-of-custody forms are presented In Appendix F A plot of <br /> influent TPH-g SVE air flow concentrations versus time is in Appendix G <br /> 55 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE 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/m 3) <br /> Q = extraction flow rate (m3/hr) <br /> t= operational period, in hours <br /> Between 09 October 2003 and 29 December 2003, the SVE unit continuously operated <br /> approximately 1,944 hours The average of analytical results between SVE air flow sampling events <br /> (Table 6), average SVE air flow rates, (Table 7) and the operational period were used to calculate <br /> the approximate volume and mass of extracted gasoline during these periods <br /> 1 During the above air monitoring events, the mass of hydrocarbons extracted from the SVE system <br /> . was calculated to be approximately 89 pounds, or equivalent to an approximate volume of 14 21 <br /> Advanced GeoEnvironmental,Inc <br />