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24 February 2003 <br /> • <br /> AGE-NC Project No 98-0452 <br /> Page 3 of 4 <br /> MTBE was detected by EPA Method 82608_4n the ground water samples collected from MW-1, <br /> MW-2 and MW-3 at concentrations of 14 micrograms per liter (µg/l), 820 µg/1 and 80 µg11, <br /> respectively No other fuel additives were detected at or above laboratory reporting limits <br /> Analytical results of ground water samples are summarized on Table 2 The laboratory report <br /> y � p <br /> (MAI Lab IDs 0212213-001 through 0212213-004) and chain-of-custody forms are included In <br />' Appendix C <br />' 4.0. SUMMARY AND CONCLUSIONS <br />' Based upon data collected from the site, AGE concludes the following <br /> • Average ground water elevation at the site has remained relatively stable since monitoring <br /> began in September 2000 <br />' • The ground water gradient was calculated to be 0 0022 ft/ft with a flow direction toward the <br /> southwest, which is more westerly than the flow direction determined during the third <br />' • quarter 2002 Ground water flow direction during previous monitoring events has alternated <br /> seasonally from the northeast to the southwest Local ground water appears to be influenced <br /> by seasonal hydrogeologac changes <br />' • TPH-g and BTEX constituents were not detected at or above laboratory reporting limits an <br /> any of the ground water samples collected and analyzed since initiation of monatonng an <br />' November 1999 <br /> • MTBE was detected an monitoring wells MW-1, MW-2 and MW-3 at concentrations of <br /> 1 4 µg/1, 820 µg/1 and 80 µg/1,respectively The concentrations detected an samples MW-2 <br />' and MW-3 exceed the DHS-Maximum Containment Level for MTBE an drinking water <br />' S.O. RECOMMENDATIONS <br />' Based upon data collected from the site, AGE recommends <br /> • Continued ground water monitoring for MTBE The next quarterly monitoring event should <br />' be scheduled for March 2003 <br /> • Preparation of a work plan to collect additional soil and ground water samples to define the <br />' western lateral extent of MTBE-impacted ground water at the site <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />