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1 HI ' 13 September 2002 • AGE-NC Prod ect No 97-0290 ' Page 4 of 6 tthe data for the monitoring event are illustrated on Figure 3 ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES TPH-g was detected in water samples collected from wells MW-2, MW-4 and MW-7 at ' concentrations of 4,400 micrograms per liter(gg/l),570 µg11 and 88 gg/l,respectively Benzene was erected in ground water samples collected from wells MW-2 and MW-4 at concentrations of 870 gg/l and 8 3 gg/l, respectively Other BTEX compounds were detected in same wells at ' imum concentrations of 120 gg/l (xylene MW-2) Petroleum hydrocarbons were not detected in the samples collected from wells MW-5 and MW-8 ' Analytical results of all water samples collected at the site are summarized on Tables 2 and 3 The laboratory report(MAI ID No 0206838-1 to -6), chain-of-custody forms and quality assurance and quality control (QA/QC) reports are included in Appendix B ' 3 3 ANALYTICAL RESULTS OF SOIL VAPOR SAMPLES The carbon-S VE unit operated continually,24 hours a day,during the observation period Extraction ' flow rates were calculated to have been as high as 55 scfin An induced vacuum(negative pressure) of up to 25 inches of water was measured in the piping between the SVE blower and extraction wells (Tables 1) ' Hydrocarbon concentrations detected in influent soil-vapor samples were as reported below ' 0 15 April 2002 TPH-g was detected at 3,200 gg/l, benzene at 5 7 µg/1, toluene at 26 µg/1, ethylbenzene at 14 µg11 and total xylenes at 88 µg/1 ' 0 06 May 2002 TPH-g was detected at 4,100 gg/l, benzene at 6 1 gg/l, toluene at 30 gg/l, ethylbenzene at 15 µg/1 and total xylenes at 98 µg/1 • 11 June 2002 TPH-g was detected at 3,400 gg/l, benzene at 5 6 µg11, toluene at 27 gg/l, ' ethylbenzene at 8 6 gg/l and total xylenes at 79 µg/1 ' The analytical results are summarized on Table 2 The laboratory reports(MAI Sample Numbers for influent samples 0205076-01/2 and 0206186-01/2)Quality Assurance and Quality Control(QA/QC) reports and chain-of-custody forms are included in Appendix C 1 ' Advanced CeoEnvironmental,Inc