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1 <br /> 10 11 January 2006 <br /> AGE-NC Project No 95-0130 <br /> Page 6 of 14 <br />' 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of three sets of extracted air flow vapor samples were collected on 15 July, 01 August and <br /> 07 September 2005 from the influent and effluent of the catalytic oxidizer vapor recovery system to <br /> measure concentrations of hydrocarbon vapor The samples were collected in Tedlar bags utilizing <br /> an electric air-vacuum pump <br /> Following sample collection,the samples were properly labeled, placed in a covered container and <br /> transported under chain of custody to Cal Tech Environmental Laboratories, a DHS-certified <br />' laboratory in California Each sample was analyzed within 72 hours of collection for TPH-g,BTEX <br /> and MTBE in accordance with EPA Methods 8015M and 8020/8021 <br /> 3 3 SOIL VAPOR EXTRACTION REMEDIATION FINDINGS <br /> From field and laboratory data collected at the SVE remediation system between 22 June 2005 and <br /> 07 September 2005, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed <br /> 3 3 1 RESULTS OF SOIL VAPOR EXTRACTION <br /> IBetween 22 June and7 September 0 Septe be 2005, the SVE remediation system was operational for <br /> I approximately 1,848 hours (Tables 6 and 7) During this operational period, SVE inlet flow rates <br /> were generally observed to average approximately 93 cubic feet per minute, from a differential <br /> pressures observed at approximately 3 10 inches of water Utilizing a photo ionization meter(PID), <br /> hydrocarbon concentrations were measured at concentrations as high as 1,117 parts per million <br /> (ppm) at regular intervals at the SVE inlet Field measurements are summarized in Table 6 <br /> 3 3 2 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> Influent and effluent SVE air flow samples were collected on 15 July, 01 August and 07 September <br /> 2005 TPH-g was detected in all three influent SVE air flow samples at concentrations as high as <br /> 3,400 µg/1 TPH-g was not detected in the above effluent air flow samples <br /> BTEX constituents were detected in all three influent SVE air flow samples at concentrations as high <br /> as 28 µg/l benzene,230µg/1 toluene,26µg/i ethylbenzene and 220µg/I xylenes Low concentrations <br /> of BTEX constituents were detected in the above effluent SVE air flow samples at concentrations <br /> • as high as 11 µg/l xylenes <br /> fAdvanced GeoEnviroutnental,Inc <br /> f <br />