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' 19 January 2004 <br /> AGE-NC Project No 95-0173 <br />' Page 6of10 <br />' 33 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of three sets of extracted air flow vapor samples were collected on 22 July, 25 August, and <br />' 23 September 2004 from the influent of the regenerative vacuum blower unit to measure <br /> concentrations of hydrocarbon vapor and from the effluent carbon canisters to measure hydrocarbon <br /> vapor adsorption The samples were collected in Tedlar bags using a hand air-vacuum pump <br />' Following sample collection, the samples were properly labeled,placed in a covered container, and <br /> transported under chain ofcustodyto Cal Tech Environmental Laboratories(CTEL),aDHS-certified <br />' laboratory, for analysis Each sample was analyzed within 72 hours of collection for TPH-g,BTEX, <br /> and MTBE in accordance with EPA Methods 8015M and 8021 <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 22 June and <br /> 23 September 2004, AGE determined the average TPH-g concentration and the average flow rate, <br />� . and calculated the approximate mass and volume of hydrocarbons removed <br />' 3 4 1 Results of Soil Vapor Extraction <br /> Between 22 June and 23 September 2004, the SVE remediation system was operational for <br /> approximately 2,232 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 to average <br /> approximately 73 cubic feet per minute(cfm)from differential pressures observed between 18 and <br />' 2 2 inches of water, with induced vacuum measurements observed between 49 and 58 inches of <br /> water Utilizing a PID,petroleum hydrocarbons were measured at concentrations as high as 194 parts <br /> per million(ppm)at regular intervals at the SVE inlet Field measurements are summarized in Table <br /> 6 <br /> 3 4 2 Analytical Results of Vapor Extraction Air Flow Samples <br /> Influent and effluent SVE air flow samples were collected on 22 July,25 August, and 23 September <br />' 2004 TPH-g was detected in the influent SVE air flow samples at concentrations of 360 jig/l, <br /> 1,200µg/1,and 1,400 p g/l,respectively TPH-g was also detected in the July,August,and September <br /> effluent air flow samples at concentrations of 120 }tg/l, 480 pg/l, and 500 µg/l, respectively <br /> Advanced GeoEnviron mental Inc <br />