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I <br />' 28 October 2005 <br /> • AGE-NC Project No 95-0130 <br />' Page 6 of 13 <br />' 32 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> One set of extracted air flow vapor samples were collected on 05 April 2005 from the influent and <br />' effluent of the catalytic oxidizer vapor recovery system to measure concentrations of hydrocarbon <br /> vapor, a second set of samples were collected on 22 June 2005 during the re-start period of the SVE <br /> system The samples were collected in Tedlar bags utilizing 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 08 March 2005 and <br /> 05 April 2005, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed <br /> 1 <br /> 3 3 1 OPERATIONAL RESULTS OF SOIL VAPOR EXTRACTION <br />' Between 08 March 2005 and 05 April 2005, the SVE remediation system was operational for <br />' approximately 669 hours(Tables 6 and 7) During this operational period,SVE inlet flow rates were <br /> observed to average approximately 60 cubic feet per minute, from a differential pressures observed <br /> at approximately 1 3 inches of water Utilizing a photo ionization meter (PID), hydrocarbon <br />' concentrations were measured at concentrations as high as 1,989 parts per million(ppm) at regular <br /> 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 05 April and 22 June 2005 TPH-g was <br /> detected in influent SVE air flow samples at concentrations of 5,000 gg/l(April)and 480 gg/1(June), <br /> and detected in the April effluent air flow sample at a concentration of 1,100 gg/l <br />' BTEX constituents were detected in the April and June influent SVE air flow samples, the highest <br /> concentrations were detected in the June sample at 35 gg/l benzene, 360 gg/l toluene, 34 µg/l <br />' ethylbenzene and 170 gg/l xylenes <br /> • <br /> Advanced GeoEnvirunwental,Inc <br /> I <br />