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i <br /> • 17 September 2003 <br /> AGE-NC Project No 98-0448 <br />' Page 6 of 9 <br />' reports (Castle Analytical Laboratory Reference Number 5839) and chain-of-custody forms are <br /> presented in Appendix C <br />' 43 RESULTS OF VAPOR EXTRACTION _ <br />' Between 20 March 2003 and 23 June 2003,the SVE and IAS remediation systems were continuously <br /> operational for 2,280 hours, the SVE and IAS systems have totaled 19,168 hours of operation since <br /> Initiation on 16 April 2001 (Table 7) During the above operational period, SVE Inlet flow rates <br />' ranged between 33 and 35 cubic feet per minute (cfin), differential pressures ranged between 0 35 <br /> and,0 45 inches of water, and induced vacuum measurements ranged between 62 and 77 Inches of <br /> water Utilizing a photo Ionization meter (PID), SVE Inlet hydrocarbon concentrations were <br />' measured between 3 and 15 parts per million(ppm),generally Field measurements are summarized <br /> in Table 6 <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />'• SVE air flow samples were collected on 20 March, on 15 April,on 15 and on 23 June 2003 Except <br /> for the May sample, TPH-g was detected above 50 lig/l from all influent SVE air flow samples at <br />' concentrations as high as 250 µg/l (June 2003) <br /> BTEX compounds were detected in all the above influent SVE air flow samples at concentrations <br /> as high as 4 6 pg/l(toluene,June 2003) Benzene was detected in the influent SVE air flow samples <br /> collected in March and June at concentrations of 0 25 gg/l and 0 29 gg/l, respectively Analytical <br /> results of SVE air flow samples are summarized in Table 5 The laboratory reports (McCampbell <br /> Analytical Laboratory Work Order Nos 0304255, 0305253 and 0306495) and chain-of-custody <br /> forms are presented in Appendix D A plot of influent TPH-g SVE air flow concentrations versus <br /> time is in Appendix E <br /> 45 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') <br /> I <br /> Advanced GeoEnviron mental,Inc <br /> I v <br />