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06 April 2005 <br /> AGE-NC Project No 98-0448 <br /> Page 6 of 9 <br />' 43 RESULTS OF VAPOR EXTRACTION <br /> Between 23 September 2004 and 22 December 2004, the SVE and IAS remediation systems were <br /> operational for a total of 2,160 hours(90 days), the SVE and IAS remediation systems have totaled <br /> 30,184 hours of operation since initiation on 16 April 2001 (Table 7) During the above operational <br /> period, SVE inlet flow rates were recorded at between 10 and 32 cubic feet per minute (cfm), <br />' differential pressures were recorded between 0 10 and 0 35 inches of water, and induced vacuum <br /> measurements ranged between 54 and 78 inches of water Utilizing a photo ionization meter(PID), <br /> SVE inlet hydrocarbon concentrations were measured between 14 and 234 parts per million(ppm) <br /> Field measurements are summarized in Table 6 <br />' 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> During the fourth quarter 2004, SVE air flow samples were collected on 25 October, on 22 <br /> November and on 22 December 2004 TPH-g was detected at concentrations of 1,100µg/l,540µg11 <br /> and 450 µg/1, respectively, from all three of the above influent SVE air flow samples <br /> Various BTEX compounds were detected in the October, November and December 2004 influent <br /> SVE air flow samples at concentrations as high as 11 µg/1 benzene, 10 µg/1 toluene, 9 5 µg/1 <br /> ethylbenzene and 33 µg/l xylenes, MTBE was not detected in any of the above air flow samples <br /> Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports(Castle <br /> Analytical Laboratory reference no 7494 and CTEL I D no 0411-168 and 0412-189), QA/QC <br /> reports and chain of custody forms are presented in Appendix D A plot of influent TPH-g SVE air <br /> flow concentrations versus time is in Appendix E, GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are included in Appendix G <br />' 4 5 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the following <br /> tequation 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 />' Advanced GeoEnnronmental,Inc <br /> I <br />