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I31 October 2003 <br /> • AGE-NC Project No 98-0511 <br /> Page 4 of 4 <br />' were detected in wells MW-1 and MW-5 at concentrations as high as 150 lig/l benzene(MW-5),5 4 <br /> µg/1 toluene (MW-1), 160 µg/1 ethylbenzene (MW-5) and 480 µg/1 total xylenes (MW-1), <br /> respectively BTEX constituents were not detected in samples collected from the other six wells <br /> I <br /> Utilizing EPA Method 8260B,MTBE was detected in.the groundwater samples collected from wells <br /> MW-3 and MW-5 at concentrations of 4 1 p,g/l and 59 µg/1, respectively No other fuel additives <br /> 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 of TPH-g,benzene and MTBE is illustrated on Figure 4 Copies of the laboratory report <br /> (MAI Lab IDs 0306423-001 through 0306423-008) 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 18 June 2003 the ground water elevation in the monitored area averaged 1 67 feet above <br /> mean sea level with the ground water elevation decreasing approximately 2 7 feet since the <br /> previous quarter The ground water flow direction was inferred to be generally westerly with <br /> a hydraulic gradient ranging from 0 002 ft/ft to 0 006 ft/ft <br /> • TPH-g was detected in ground water samples MW-1 and MW-5 at concentrations as high <br /> as 2,000 �ig/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 />' • MTBE was detected in samples MW-3 and MW-5 at concentrations of 4 1 tig/1 and 59 gg/l, <br /> respectively The concentration of MTBE in sample MW-5 was above the MCL (13 4g/1) <br /> for MTBE in drinking water <br />' • Hydrocarbon-impacted ground water is not defined laterally along the upgradient direction, <br /> east side of the site <br /> 1 <br /> Advanced CcoEnvironmental,Inc <br />