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I <br />' 26 September 2002 <br /> • AGE-NC Project No 95-0173 <br /> IPage 5 of 8 <br />' concentration of 1 5 µg/1 No other fuel components were detected in the samples analyzed Previous <br /> and current analytical results of ground water monitoring well samples are summarized in Tables 3 <br /> and 4,respectively The laboratory reports (CAL Reference No 4805) and chain-of-custody forms <br /> Iare presented in Appendix C <br /> 43 RESULTS OF SOIL VAPOR EXTRACTION <br /> Between 11 March 2002 and 11 June 2002,the SVE and IAS remediation systems were operational <br /> I for approximately 2,208 hours(Table 6) During the operational period, SVE inlet flow rates ranged <br /> from 91 to 98 cubic feet per minute, differential pressures ranged between 3 0 and 3 2 inches of <br /> water, and Induced vacuum between 34 and 36 inches of water Utilizing a photo ionization meter <br /> (PID), hydrocarbon concentrations were measured between 9 and 156 parts per million (ppm) at <br /> regular Intervals at the SVE Inlet Field measurements are summarized in Table 6 <br /> 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> tSVE air flow samples were collected on 11 March, 15 April, 13 May and 11 June 2002 TPH-g was <br /> detected in all three Influent SVE air flow samples at concentrations as high as 520 µg/l,TPH-g was <br /> detected in the March 2002 effluent SVE air flow sample at a concentration of 150 µg/1 <br /> BTEX compounds were detected in all four influent SVE air flow samples at concentrations as high <br /> I as 59 µg/l (xylenes, I 1 March 2002), the maximum benzene concentration was detected in the <br /> 11 March 2002 at a concentration of 1 8 gg/l BTEX constituents were detected in the March 2002 <br /> and the June 2002 effluent SVE air flow samples at concentrations as high as 23 µg11 xylenes <br /> IAnalytical results of SVE air flow samples are summarized in Table 5 The laboratory reports <br /> (McCampbell Analytical Laboratory I D Nos 0204267-1A and 2A, 0205179-1A and 2A and <br /> 0206185-IA and 2A)and chain-of-custody forms are presented in Appendix D A plot of laboratory <br /> analysis of SVE Influent TPH-g air flow concentrations versus time is included with Appendix E <br /> 45 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the equation <br /> M = C•Q•t <br /> where M = cumulative mass recovered(kg) <br /> C = vapor concentration (kg/m') <br /> IAdvanced GcoEnvironmentaf,Inc <br />