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Z <br />' 26 September 2002 <br /> AGE-NC Project No 98-0448 <br />' Page 5 of 8 <br />' are summarized in Tables 3 and 4 The laboratory reports (McCampbell Analytical Inc I D m <br /> 0205439) and chain-of-custody forms are presented in Appendix C <br /> 43 RESULTS OF VAPOR EXTRACTION <br />' Between 11 March 2002 and 11 June 2002,the SVE and IAS remediation systems were continuously <br /> operational for 2,208 hours, the SVE and IAS systems have totaled 10,360 hours of operation since <br /> Initiation on 16 April 2001 (Table 7) During the March, April, May and June 2002 operational <br /> Iperiod, SVE Inlet flow rates ranged from 29 to 48 cubic feet per minute(cfm), differential pressures <br /> ranged between 0 28 and 0 75 inches of water, and induced vacuum between 58 and 70 inches of <br /> water Utilizing a photo ionization meter (PID), SVE inlet hydrocarbon concentrations were <br />' measured between 0 and 10 parts per million(ppm),however a general concentration trend was not <br /> established from the PID field measurements Field measurements are summarized In Table 6 <br /> 4 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 23 April, 13 May and 11 June 2002 TPH-g was detected <br /> from all influent SVE air flow samples at concentrations as high as 190µg11 TPH-g was not detected <br /> in any of the above referenced effluent SVE air flow samples <br /> BTEX compounds were detected in all influent SVE air flow samples at concentrations as high as <br /> 21 ,ugll (xylene, 23 April 2002) Benzene was not detected in any of the above referenced influent <br /> or effluent SVE air flow samples Analytical results of SVE air flow samples are summarized in <br /> Table 5 The laboratory reports(McCampbell Analytical Laboratory D Nos 0204383-1A and 2A, <br /> I <br /> 0205182-IA and 2A and 0206184-IA and 2A and chain-of-custody forms are presented in Appendix <br /> D A plot of influent TPH-g SVE air flow concentrations versus time is in Appendix E <br /> I <br /> I45 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 /> Iwhere M = cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m3) <br /> Q = extraction flow rate (M3/hr) <br /> Advanced GcoEnvironmental,Inc <br />