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09 December 2003 AGE-NC Project No 98-0452 IPage 3 of 4 ' BTEX compounds were not detected at or above laboratory reporting limits in the four ground water samples analyzed ' MTBE was detected by EPA Method 8260B in the ground water samples collected from MW-2 and MW-3 at concentrations of 150 µg/1 and 78 µg/l,respectively No other fuel additives were detected at or above laboratory reporting limits Analytical results of ground water samples are summarized on Table 2 The laboratory report (CTEL Project No CT214-0309096) and chain-of-custody forms are included in Appendix C 4.0. SUMMARY AND CONCLUSIONS Based upon data collected from the site, AGE concludes the following • Average ground water elevation at the site has remained relatively stable since monitoring began in September 2000 • The ground water gradient was calculated to be 0 007 foot/foot with a flow direction toward ithe southwest, which is shallower than the gradient calculated during the second quarter 2003 Ground water flow direction during previous monitoring events has alternated from the northeast to the southwest Local ground water appears to be influenced by seasonal hydrological changes • TPH-g was detected in monitoring well MW-2 at a concentration of 200 µg11 ' • BTEX constituents have not been detected at or above laboratory reporting limits in any of the ground water samples collected and analyzed since initiation of monitoring in November ' 1999 • MTBE was detected in monitoring wells MW-2 and MW-3 at concentrations of 150µg/1 and 78 µg/1, respectively The concentrations detected in samples MW-2 and MW-3 exceed the ' DHS-Maximum Containment Level for MTBE in drinking water ' 5.0. RECOMMENDATIONS ' Based upon data collected from the site, AGE recommends • Continued ground water monitoring for MTBE The next quarterly monitoring event is ' scheduled for December 2003 Advanced Gen EnvLronmental,Inc