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' 07 November 2005 • AGE-NC Project No 98-0448 ' Page 6 of 9 36,400 hours of operation since initiation on 16 April 2001 (Table 7) During the above operational ' period, SVE inlet flow rates were recorded at between 30 and 58 cubic feet per minute (cfm) and differential pressures were recorded between 0 3 and 1 I inches of water Utilizing a photo ionization ' meter (PID), SVE inlet hydrocarbon concentrations were measured between 0 5 and 3 parts per million by volume (ppmv) Field measurements are summarized in Table 6 ' 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES ' During the third quarter 2005, SVE air flow samples were collected on 12 July, 09 August and 07 September 2005 TPH-g, BTEX nor MTBE were not detected above the laboratory reporting limits in any of the influent air flow samples collected this quarter ' Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports (Cal Tech Environmental Laboratories I D nos 0507-060,0508-062 and 0509-044),QA/QC reports and chain of custody forms are presented in Appendix D A plot of influent TPH-g SVE air flow concentrations versus time is in Appendix E, GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix G 45 MASS CALCULATION OF RECOVERED PRODUCT The hydrocarbon mass removed during the SVE operating period was calculated using the following ' equation M = C•Q*t where M =cumulative mass recovered (kg) C =vapor concentration (kg/m') Q = extraction flow rate (m'/hr) t = operational period, in hours I Between 08 June 2005 and 07 September-2005, the SVE unit operated for approximately 2,184 ' hours The average of analytical results between SVE air flow sampling events (Table 6), average SVE air flow rates, (Table 7) and the operational period were used to calculate the approximate volume and mass of extracted gasoline during these periods Note the detection limit of the analytical method was used for mass calculation During the above air monitoring events, the mass of hydrocarbons extracted from the SVE system was calculated to be approximately 17 pounds, or equivalent to an approximate volume of 2 72 gallons of gasoline extracted A plot of the cumulative volume (gallons) of hydrocarbons extracted to date is in Appendix E Added to the estimated 312 55 gallons ofhydrocarbons extracted from the SVE system since 16 April 2001,the total volume IAdvanced GeoEnvironmental,Inc