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' 15 December 2005 AGE-NC Project No 03-1070 ' Page 3 of 4 ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in ground water samples collected from wells MW-I through MW-4 at a ' maximum concentration of 15,000 micrograms per liter (µg11) in well MW-3 One or more BTEX compounds were detected in ground water samples collected from wells MW-1 through MW-4 at maximum concentrations of 5,700 µg/1 benzene (MW-3), 1,300 µg/1 toluene (MW-2), 270 Vg/l ethylbenzene (MW-2), and 1,050 pg/l total xylenes (MW-2) Three fuel additives were detected in the analyzed samples MTBE was detected in ground water ' samples collected from wells MW-1 through MW-4 at a maximum concentration of 5,700 lig/l (MW-3), 1,2-DCA was detected in ground water samples MW-1 through MW-4 at a maximum concentration of I3 µg11 in MW-3, and TAME was detected in ground water samples ' MW-2 and MW-3 at concentrations of 40 pg/l, and 17 µg/1, respectively No other analytes were detected at or above laboratory detection limits in the ground water samples analyzed The analytical results of the ground water samples collected on 23 August 2005 are summarized in Table 2 A plane view map depicting the lateral extent of petroleum hydrocarbon contamination is illustrated on Figure 4 The laboratory report(CTEL Project No CT214-0508154), ' S quality assurance/quality control (QA/QC) reports and chain of custody form are included in Appendix C Confirmation pages of the submitted laboratory electronic deliverable format (EDF) files and depth to water measurements are included in Appendix D 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE concludes ' • The ground water elevations ranged from 17 57 feet to 17 89 feet below MSL Net ground water flow was inferred to be flowing towards the southeast an average gradient between ' 0 005 ft/ft and 0 008 ft/ft • TPH-g and BTEX compounds were detected in ground water samples collected from wells ' MW-1 .through MW-4 The BTEX compounds benzene and toluene are present at concentrations that exceed the DHS' Maximum Contaminant Level (MCL) for these compounds in drinking water 1 • The fuel additives MTBE, 1,2-DCA and TAME were detected,MTBE and 1,2-DCA in wells MW-1 through MW-4, and TAME in wells MW-2 and MW-4 ' 0 Petroleum hydrocarbon-impact to ground water is not defined in any direction tAdvanced GeoEnvironmental,Inc