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' 01 October 2004 <br /> AGE-NC Project No 95-0173 <br />' Page 6of10 <br />' 3 4 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE REMEDIATION FINDINGS <br /> From field and laboratory data collected at the SVE remediation system between 24 March 2004 and <br /> 22 June 2004, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed <br /> 1 3 4 1 Results of Soil Vapor Extraction <br />' Between 24 March 2004 and 22 June 2004, the SVE remediation system was operational for <br /> approximately 2,160 hours(Tables 6 and 7) The IAS system cycled or operated contemporaneously <br /> with the SVE system During this operational period, SVE inlet flow rates were observed at an <br />' average of approximately 74 cubic feet per minute with differential pressures observed at <br /> approximately 2 0 inches of water and induced vacuum measurements observed between 48 and 62 <br /> inches of water Utilizing a photo ionization meter(PID),hydrocarbon concentrations were measured <br /> as high as 262 parts per million(ppm) at regular intervals at the SVE inlet Field measurements are <br /> summarized in Table 6 <br /> lie <br /> 3 4 2 Analytical Results of Vapor Extraction Air Flow Samples <br />' Influent and effluent SVE air flow samples were collected on 28 April, 26 May and 22 June 2004 <br /> TPH-g was detected in all three influent SVE air flow samples at concentrations as high as 110 µg/1 <br />' TPH-g was not detected in any of the effluent air flow samples BTEX constituents were not detected <br /> in any of the influent or effluent SVE air flow samples <br />' Analytical results of SVE air samples are summarized in Table 5, the GeoTracker confirmation <br /> pages of the submitted laboratory electronic deliverable format(EDF)files are included in Appendix <br /> C,the laboratory reports(CTEL Project Nos CT214-0404207,0405172 and 0406210)and chain of <br />' custody forms are presented in Appendix F A plot of laboratory analysis of SVE influent TPH-g air <br /> stream concentrations versus time is included in Appendix G <br /> 3 4 3 Mass Calculation of Recovered Product <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the equation <br /> M = C•Q•t <br /> where M = cumulative [Hass recovered (kg) <br /> C =vapor concentration (kg/m3) <br /> Advanced GeoEnvironmental,Inc <br />