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I - - 28 October 2011 AGE- NC Project No. 99-0682 Page 2 of 4 Environmental 580B ; 10 . 0 eV; calibrated to isobutylene ) , and 3 ) influent soil vapor and effluent vapor stream samples were collected from sampling ports installed upstream (influent) of the SVE vacuum blower and downstream (effluent) of the SVE thermal/catalytic oxidizer and submitted for laboratory analysis . Field SVE measurements were recorded at regular intervals and are summarized in Table 1 . Analytical results of SVE air flow samples are summarized in Table 2 . SVE performance data are summarized in Table 3. 2 .2 . COLLECTION AND ANALYSIS OF SVE SAMPLES Atotal of two sets of extracted influent and effluent SVE samples were collected on 11 July and 09 August 2011 from representative ports on the catalytic oxidizer vapor recovery system to measure concentrations of hydrocarbon vapor. Samples were collected in Tedlar bags utilizing an electric air-vacuum pump . Following sample collection , samples were properly labeled , placed in a covered container and transported under chain of custody to CalTech Environmental Laboratories (CTEL ). Each sample was analyzed within 72 hours of collection for total petroleum hydrocarbons as gasoline (TPH-g), volatile aromatic compounds ( benzene , toluene, ethylbenzene and total xylene : BTEX) and methyl tertiary butyl ether ( MTBE ) in accordance with EPA Methods 8015M and 82608 , respectively. 2 .3 . SOIL VAPOR EXTRACTION FINDINGS From field and laboratory data collected at the SVE remediation system between 06 June and 22 August 2011 , AGE determined the average TPH concentration , the average flow rate and calculated the approximate mass and volume of hydrocarbons removed . 2 .3 . 1 . Soil Vapor Extraction Performance Between 06 June and 22 August 2011 , the SVE remediation system operated for 1 , 748 hours . During this operational period , SVE inlet flow rates (total flow) were generally observed between 65 scfm and 77 scfm . Utilizing a photo ionization meter (PID) , hydrocarbon concentrations were measured from the SVE influent at concentrations ranging between 46 parts per million volume (ppmv) and 171 ppmv. Field measurements are summarized in Table 1 . Advanced GcoEnvironmental, Inc.