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' 24 July 2002 AGE-NC Project No 01-0827 ' Page 3 of 6 • BTEX compounds and fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE, in accordance with EPA Method 8260 Modified, and ' • Methanol, ethanol, 1,2-Dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 I 3.0 FINDINGS ' From field data collected at the SVE remediation system between 12 March and 11 June 2002,AGE determined the average TPH-g concentration and the average flow rate, and calculated the approximate mass and volume of hydrocarbons removed Ground water flow direction and gradient from the field data collected on 03 May 2002,the contaminant impact to ground water was assessed from the laboratory data 3 1 SOIL-VAPOR EXTRACTION The SVE unit was operated continuously during the period between 12 March and 11 June 2002, except during maintenance, the unit typically operated at between 100 to 110 cubic feet per minute (cfin) An induced vacuum(negative pressure) of approximately 30 inches of water was measured in the piping between the blower and extraction wells An induced vacuum of approximately 0 11 inches and 0 01 inches was measured at well MW-1 and MW-3, distances of 10 feet and 45 feet, respectively, from the extraction wells Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured between 0 and 53 parts per million (ppm) at the SVE intake during this period Field measurements are summarized in Table 1 32 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES TPH-g was detected from the influent SVE air flow samples collected on 13 March and 14 April 2002 at concentrations of 82 micrograms/liter(µg/l)and 68 gg/l, respectively TPH-g was detected in the 13 March 2002 effluent air flow sample at a concentration of 110 gg/l Xylenes was detected from the influent SVE air flow samples collected on 13 March and 14 April 2002 at concentrations of 2 2 ggll and 0 69 µg/l, respectively Toluene, ethylbenzene and xylenes were detected to the effluent SVE air flow sample collected on 13 March 2002 at concentrations of 8 7 gg/l, 19 µg11 and 12 µg/1, respectively Advanced GeoEnvironmental,Inc