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1 <br />' 30 October 2003 <br /> AGE-NC Project No 98-0511 <br /> Page 4 of 5 <br />' MW-1 and MW-5 at concentrations as high as 25 ptg/l benzene(MW-1), 2 3 gg/1 toluene(MW-1), <br /> 78 µg/1 ethylbenzene (MW-5) and 25 µg/1 total xylenes (MW-1), respectively BTEX constituents <br />' were not detected in samples collected from the other six wells <br /> Utilizing EPA Method 8260B, MTBE was detected in the ground water samples collected from <br />' MW-1,MW-3 and MW-5 at concentrations of 0 95 µg/1,7 4µg/1 and 40 jig/I,respectively No other <br /> fuel additivies were detected above laboratory reporting limits <br />' Analytical results of ground water samples are summarized on Tables 2 and 3 The inferred lateral <br /> distribution ofTPH-g,benzene and MTBE is illustrated on Figure 4 Copies of the laboratory report <br /> (MAI Lab IDs 0309139-001 through 0309139-008) and chain-of-custody forms are provided in <br />' Appendix C <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> On 08 September 2003 the ground water elevation in the monitored area averaged 0 22 feet <br /> below mean sea level with the ground water elevation decreasing approximately 19 feet <br />' since the previous quarter The ground water flow direction was inferred to be generally <br /> southwesterly, consistent with previous flow directions, with a relatively flat hydraulic <br />' gradient ranging from 0 002 ft/ft to 0 003 ft/ft <br /> TPH-g was detected in ground water samples MW-1 and MW-5 at concentrations as high <br /> as 890 gg/1 (MW-5) BTEX compounds were also detected in sample MW-1 and MW-5 <br />' BTEX constituents were not detected in samples collected from the other six monitoring <br /> wells Several of these constituents exceed the DHS Maximum Contaminant Levels(MCL) <br /> in drinking water <br /> re MTBE was detected in samples MW-1, MW-3 and MW-5 at concentrations of 0 95 µg/l, <br /> 7 4µg/1 and 40 pg/l,respectively The concentration of MTBE in sample MW-5 was above <br />' the MCL (13 [ig/1) for MTBE in drinking water <br /> Hydrocarbon-impacted ground water is not defined laterally along the upgradient, east side <br />' of the site <br /> I <br /> IAdvanced GeoEnVLronmental,Inc <br />