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i11 March 2002 <br /> AGE NC Project No 95-0143 <br />' Page 4 of 5 <br />' 4 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> During the February 2002 rnonitonng event, TPH-g was detected In samples collected from <br />' monitoring wells MW-3,MW-6,MW-7 and MW-9 at concentrations ranging from 160µg/l(MW-7) <br /> to 110,000 µg/l(MW-3) BTEX compounds were detected In wells MW-3, MW-6,MW-7,MW-9, <br /> MW-10, MW-14, MW-15, MW-16 and MW-17 at concentrations as high as 35,000 µg/l toluene <br />' (MW-3) TBA was detected in the sample collected from MW-24 at a concentrations of 21 µg11 <br /> MTBE, DIPE,ETBE, TAME, EDB and 1,2-DCA were not detected In samples collected from the <br /> site during the February 2002 sampling event Figure 4 illustrates the approximate extent of TPH-g <br />' 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 February 2002 monitoring event are summarized on <br /> Table 2 Analytical results of historical ground water samples are summarized on Tables 3 and 4 <br /> The laboratory report (MAI Laboratory IDs 90474 through 90485) and chain-of-custody forms are <br />' Included in Appendix B <br />' * 5.0. SUMMARY/CONCLUSIONS <br />' Based upon data collected from the site, AGE concludes <br /> • Ground water elevation Increased approximately 102 feet between November 2001 and <br />' February 2002 Groundwater elevation was within the screened Interval of MW-17,MW-22, <br /> MW-23,MW-24 and the five vapor extraction wells,but above the screened Intervals of the <br /> other eight monitoring wells The Inferred ground water flow direction remains variably <br /> toward the north to northeast at the site <br /> • Petroleum hydrocarbons were detected In nine of the twelve ground water monitoring wells <br /> sampled at concentrations ranging from 0 54 µg/1 toluene (MW-14)to 110,000 µg/1 TPH-g <br /> i (MW-3) TBA was detected In the sample collected from MW-24 at a concentration of <br /> 21 µg/1 MTBE, DIPE, ETBE, TAME, EDB and 1,2-DCA were not detected in samples <br /> collected from the site during the February 2002 sampling event Historically, only low <br /> concentrations of fuel oxygenating compounds have been detected at the site since <br /> monitoring for these compounds began in August 1997 <br /> i <br /> Advanced GeoE nviro n mental,Inc <br />