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06 November 2002 <br /> • AGE-NC Project No 97-0290 <br /> Page 4 of 6 <br /> I32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in water samples collected from wells MW-2, MW-4, MW-6 and MW-7 at <br />' concentrations of 3,000 micrograms per liter(µg/1), 1,300µg/1, 140 µg11 and 230µg/1,respectively <br /> Benzene was detected in ground water samples collected from wells MW-2 and MW-4 at <br /> concentrations of 520 gg/l and 4 5 pg/l,respectively Toluene, ethylbenzene and xylenes were also <br /> detected in samples MW-2 and MW-4 at a maximum concentration of 160 µg/1 xylene (MW-2) <br /> Petroleum hydrocarbons were not detected in the samples collected from wells MW-5 and MW-8 <br />' The fuel additive MTBE was detected in samples MW-2 and MW-4 at a maximum concentration <br /> of 16 µg/l (MW-4) <br />' Analytical results of all water samples collected at the site are summarized on Tables 2 and 3 The <br /> laboratory report(CalTech ID No 0209-18 1-1 to-6), chain-of-custody forms and quality assurance <br /> and quality control (QA/QC) reports are included In Appendix B <br /> I <br /> • 3 3 ANALYTICAL RESULTS OF SOIL VAPOR SAMPLES <br /> The carbon-SVE unit operated continually,24 hours a day,during the observation perod Extraction <br /> flow rates were calculated to have been as high as 59 scfm An Induced vacuum(negative pressure) <br /> of up to 20 inches of water was measured in the piping between the SVE blower and extraction wells <br /> (Table 4) <br />' Hydrocarbon concentrations detected in influent soil-vapor samples were as reported below <br /> • 17 July TPH-g was detected at 1,700 µg/l, benzene at 2 9 µg/l, toluene at 16 µg/1, <br />' ethylbenzene at 4 6 µg/1 and total xylenes at 43 µg/l <br /> • 19August TPH-g was detected at 2,200 µg11, benzene at 4 1 µg/l, toluene at 16 µg/1 and <br />' ethylbenzene at 5 8 µg/1 <br /> • 26 September TPH-g was detected at 2,600 µg/1, benzene at 3 7 µg/1, toluene at 15 µg/l, <br />' ethylbenzene at 5 4 µg/1 and total xylenes at 52 µg11 <br /> The analytical results are summarized on Table 2 The laboratory reports(MAI Sample Numbers for <br />' Influent samples 0207236, 020826 and 020945 1)Quality Assurance and Quality Control (QA/QC) <br /> reports and chain-of-custody forms are Included in Appendix C <br /> 1 <br /> i <br />' Advanced GeoEnvironmental,Inc <br /> I <br />