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I21 November 2001 <br /> • AGE-NC Project No 95-0143 <br /> Page 3 of 4 <br /> monitoring wells MW-3, MW-6,MW-7 and MW-9 at concentrations ranging from 330 4g/1(MW 6) <br /> to 150,000 µg/1 (MW-3) BTEX compounds were detected in wells MW-3, MW-6, MW-7 and <br /> MW-9 at concentrations as high as 35,000 4g/1 toluene (MW-3) MTBE and other fuel oxygenates <br /> were not detected in samples collected from the site during the August 2001 sampling event <br /> Figure 4 illustrates the approximate extent of TPH-g and benzene contamination in ground water <br /> Measurable free product was not encountered in any of the wells on the site Analytical results of <br /> ground water samples collected during the August 2001 monitoring event are summarized on <br /> Table 2 Analytical results of historical ground water samples are summarized on Table 3 The <br /> laboratory report (MAI Laboratory lDs 74958 through 74969) and chain-of-custody forms are <br /> included in Appendix B <br /> I <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> • Ground water elevation decreased approximately 0 74 feet between May 2001 and <br /> August 2001 Groundwater elevation was within the screened interval of MW-16, MW-17, <br /> MW-22, MW-23, MW-24 and the five vapor extraction wells, but above the screened <br /> I interval of the other seven monitoring wells The inferred ground water flow direction <br /> remains variably toward the north to northeast at the site <br /> • Petroleum hydrocarbons were detected in four of the twelve ground water monitoring wells <br /> sampled at concentrations ranging from 330 µg/1 (MW-6) to 150,000 µg/1 (MW-3) MTBE <br /> and other fuel oxygenates were not detected in the analyzed ground water samples collected <br /> during the August 2001 monitoring event Historically, only low concentrations (<7 µg/1) of <br /> fuel oxygenating compounds have been detected at the site since monitoring for these <br /> compounds began in August 1997 <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during the August 2001 and previous sampling events,AGE recommends <br /> IContinued quarterly monitoring of the ground water monitoring well system on the site The <br /> next quarterly monitoring should be performed in November 2001, concurrent with <br /> monitoring at the Madison site <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />