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02 April 2013 <br /> AGE-NC Project No. 95-0130 <br /> Page 3 of 9 <br /> the carbon canister vapor recovery system. The influent and effluent samples were <br /> collected in Tedlar bags utilizing an electric vacuum pump. <br /> Following sample collection, the samples were properly labeled, placed in a covered <br /> container and transported under chain of custody to CalTech Environmental Laboratories <br /> (CTEL),a California Department of Public Health(CDPH)-certified laboratory. Each sample <br /> was analyzed within 72 hours of collection for total petroleum hydrocarbons as gasoline <br /> (TPH-g), volatile aromatic compounds (BTEX) and methyl tertiary butyl ether (MTBE) in <br /> accordance with EPA Methods 8015M and 8260B. <br /> 2.3. SOIL-VAPOR EXTRACTION REMEDIATION FINDINGS <br /> From field and laboratory data collected at the SVE remediation system during the 41h <br /> quarter 2012, AGE determined the average TPH-g concentration, the average flow rate <br /> and calculated the approximate mass and volume of hydrocarbons removed. <br /> 2.3.1. Results of Soil-Vapor Extraction <br /> During the 41h quarter 2012, the SVE remediation system was operational for a total of <br /> 2,238 hours (Tables 2 and 3). During this operational period, total SVE inlet flow rates <br /> generally averaged 55 cubic feet per minute (average differential pressures of 1.0 inches <br /> of water). Utilizing a photo ionization meter (PID) in the field, hydrocarbon concentrations <br /> were measured at concentrations as high as 163 parts per million volume (ppmV)from the <br /> SVE inlet. Field measurements are summarized in Table 2. <br /> 2.3.2. Analytical Results of Vapor Extraction SVE Flow Samples <br /> TPH-g were detected in the October, November and December 2012 influent soil-vapor <br /> samples at concentrations of 850 micrograms per liter (pg/1), 360 pg/I and 300 pg/I, <br /> respectively. TPH-g range compounds were not detected in any of the effluent samples. <br /> BTEX constituents were detected in all three influent SVE samples at concentrations as <br /> high as 1.6 pg/I toluene and 8.1 pg/I total xylenes; benzene was not detected above <br /> reporting limits. BTEX constituents were not detected in the effluent air flow samples. <br /> MTBE was not detected in any of the influent or effluent samples. <br /> Analytical results of SVE samples are summarized in Table 1. The GeoTracker <br /> confirmation numbers 3859531462, 9470092058 and 2423893034 reference the upload <br /> Advanced GeoEnvironmental,Inc. <br />