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I <br />' 27 April 2004 <br /> • AGE-NC Project No 98-0511 <br />' Page 3 of 4 <br />' 32 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> Toluene and ethylbenzene were detected in MW-1 at concentrations of 0 79 micrograms per liter <br />' (µg/1)and 1 2 µg/l,respectively BTEX constituents were not detected in samples collected from the <br /> other seven 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 2 1 µg/1, 8 5 gg/1 and 79 µg/1, respectively In <br />' addition, 1,2-DCA was detected 1n MW-5 at a concentration of 19 µg/1 No other fuel additives were <br /> 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 0312366-001 through 0312366-008) and chain-of-custody forms are provided in <br /> Appendix C <br /> I• 4 0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br />' On 17 December 2003 the ground water elevation in the monitored area averaged 1 36 feet <br /> above MSL with the ground water elevation increasing approximately 1 14 feet since the <br /> Iprevious quarter The ground water flow direction was inferred to be generally southwesterly, <br /> consistent with previous flow directions, with a relatively flat hydraulic gradient of <br /> 0 002 ft/ft <br /> • TPH-g was not detected in the samples collected from wells MW-1 through MW-8 <br /> • Toluene and ethylbenzene was detected in sample MW-1 BTEX constituents were not <br /> detected in samples collected from the other seven monitoring wells <br /> • MTBE was detected in samples MW-1, MW-3 and MW-5 at concentrations of 2 1 µg/l, <br /> I 8 5 µg/1 and 79 gg/l,respectively The detected concentrations of MTBE in samples MW-3 <br /> and MW-5 were above the Secondary MCL (5 pg/1) for MTBE in drinking water <br /> I Hydrocarbon-impacted ground water is not defined laterally along the upgradient, east side <br /> of the site <br /> Advanced Geo E im ro n menta 1,1nc <br />