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14 February 2006 <br /> • AGE-NC Project No 98-0448 <br />' Page 6 of 9 <br />' 43 RESULTS OF VAPOR EXTRACTION <br /> Between 07 September 2005 and 22 November 2005, the SVE and IAS remediation systems were <br />' operational for a total of 1,824 hours(76 days), the SVE and IAS remediation systems have totaled <br /> 38,224 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 44 and 54 cubic feet per minute (cfm) and <br />' differential pressures were recorded between 0 5 and 0 75 inches of water Utilizing a photo <br /> ionization meter (PID), SVE inlet hydrocarbon concentrations were measured between 0 5 and 1 <br /> parts per million by volume (ppmv) Field measurements are summarized in Table 6 <br /> I <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' During the fourth quarter 2005, SVE air flow samples were collected on 10 October and 22 <br /> November 2005 TPH-g, BTEX nor MTBE were not detected above the laboratory reporting limits <br /> I in the influent air flow samples collected from the October 2005 sampling event TPH-g and BTEX <br /> were detected in the November 2005 sample at concentrations of 230 µg/1 TPH-g, 6 5 µg11 benzene, <br /> 21 µg/1 toluene, 4 0 µg/1 ethylbenzene and 24 µg/1 total xylenes <br />' • <br /> Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports Cal <br /> Yt p rY p ( <br />' Tech Environmental Laboratories I D nos 0510-109 and 0511-158), QA/QC reports and chain of <br /> custody forms are presented in Appendix D A plot of influent TPH-g SVE air flow concentrations <br /> versus time is in Appendix E,GeoTracker confirmation pages of the submitted laboratory electronic <br />' deliverable format (EDF) files are included in Appendix G <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/m3) <br /> Q = extraction flow rate (m3/hr) <br /> t=operational period, in hours <br /> I <br /> Between 07 September 2005 and 22 November 2005,the SVE unit operated for approximately 1,824 <br /> hours The average of analytical results between SVE air flow sampling events (Table 6), average <br /> SVE air flow rates, (Table 7) and the operational period were used to calculate the approximate <br /> Advanced GeoEnvironmenbl,Inc <br /> I <br />