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30 October 2002 <br /> • AGE-NC Project No 01-0827 <br /> Page 3 of 5 <br /> • BTEX compounds and fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl <br /> ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and MTBE, in <br /> accordance with EPA Method 8260 Modified, and 1,2-Dichloroethane (1,2-DCA) and <br /> ethylene dibromide(EDB)by EPA Method 8260 <br /> 3.0. FINDINGS <br /> I From field data collected at the SVE remediation system between 11 June and 20 August 2002,AGE <br /> determined the average TPH-g concentration and the average flow rate, and calculated the <br /> approximate mass and volume of hydrocarbons removed Ground water flow direction and gradient <br />' were determined from the field data collected on 04 September 2002, the contaminant impact to <br /> ground water was assessed from the laboratory data of ground water samples collected on 30 August <br /> 2002 <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> 10 The SVE unit was operated continuously during the period between 11 June and 30 August 2002, <br /> except during maintenance,the unit typically operated at between 100 to 115 cubic feet per minute <br /> (cfm) An induced vacuum(negative pressure) of approximately 33 inches of water was measured <br /> in the piping between the blower and extraction wells <br /> Induced vacuum measurements of approximately 0 10 inches and 0 05 inches were measured at <br /> monitoring wells MW-1 and MW-3, at distances of 10 feet and 45 feet, respectively, from the <br /> extraction wells Utilizing a photo ionization meter (PID), hydrocarbon concentrations were <br /> Imeasured between 11 1 and 34 4 parts per million(ppm) at the SVE intake during this period Field <br /> measurements are summarized in Table 1 <br /> rThe SVE/IAS system was decommissioned on 30 August 2002 for site surface improvements <br /> I32 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> I TPH-g and BTEX compounds were not detected in the influent SVE air flow samples collected on <br /> 11 June, 17 July and 20 August 2002 The analytical results of SVE air flow samples are summarized <br /> in Table 2 The laboratory reports (MAI Lab Numbers 0207240-01 and 0208346-01) Quality <br /> IAssurance and Quality Control (QA/QC) reports and chain-of-custody forms are included in <br /> . Appendix B <br /> IAdvanced GeoEnvironmental,Inc <br />