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1 <br />' 19 January 2004 <br /> AGE-NC Project No 95-0173 <br />' Page 7of10 <br />' BTEX constituents were detected in the influent SVE air flow samples at concentrations as high as <br /> 5 5 µg/1 benzene, 13 µg/1 toluene, 13 µg/1 ethylbenzene, and 30 µg/1 xylenes in the September <br /> sample Low concentrations of BTEX constituents were detected in the August and September 2004 <br /> effluent SVE air flow samples at concentrations as high as 3 5 µg/1 benzene, 10 µg/l toluene, and 16 <br /> µg/1 xylenes in the September sample <br />' Analytical results of SVE air samples are summarized in Table 5 The GeoTracker confirmation <br /> pages ofthe submitted laboratory electronic deliverable format(EDF)files are included in Appendix <br /> B, the laboratory reports (CTEL Project Nos CT214-040715, -0408171, and -0409155), QA/QC <br />' reports, and chain of custody forms are presented in Appendix E, a plot of laboratory analyses of <br /> SVE influent TPH-g air stream concentrations versus time is included in Appendix F <br />' 3 4 3 Mass Calculation of Recovered Products <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the equation <br /> M = C•Q•t <br /> lie where M = cumulative mass recovered (kg) <br /> C =vapor concentration (kg/m') <br />' Q = extraction flow rate (m3/hr) <br /> t =operational period, in hours <br /> Between 22 June and 23 September 2004 (third quarter 2004), the SVE unit operated a total of <br /> 2,232 hours(Table 6) The average analytical results(768 µg/1)of the influent SVE air flow samples <br /> (Table 5), average flow rates (approximately 73 cfin, Table 6) and the operational period <br />' (2,232 hours)were used to calculate the approximate mass of extracted gasoline during this period - <br /> During the third quarter 2004 operational period, the mass of hydrocarbons extracted by the SVE <br />' system was calculated to be approximately 475 pounds, or equivalent to a volume of approximately <br /> 76 gallons of gasoline Added to the estimated 1,938 gallons of hydrocarbons extracted from the <br /> SVE system since 11 April 2000 (start-up), the total volume of hydrocarbons extracted to date is <br /> estimated at 2,014 gallons (Table 7) A plot of the cumulative volume (gallons) of hydrocarbons <br /> extracted to date is included with Appendix F The volume/mass calculations for extracted <br /> hydrocarbons are included with Appendix G <br /> 4 0. CONCLUSIONS <br /> . The implications from the October 2004 ground water monitoring event are as follows <br /> Advanced GeaEnvi ron mental,Inc <br />