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' 25 August 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 MWA through MW-4 at a ' maximum concentration of 21,000 micrograms per liter (µg/1) in well MW-2 One or more BTEX compounds were detected in ground water samples collected from wells MW-1 through MW-4 at maximum concentrations of 5,300 gg/l benzene (MW-3), 1,500 gg/1 toluene (MW-2), 320 µg11 ethylbenzene (MW-2), and 1,620 gg/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 12,000 µg11(MW-2), 1,2-DCA was detected in ground water samples MW-2, MW-3 and MW-4 at concentrations of 13 gg/1,49 gg/l and 17µg/1,respectively,and TAME was detected in ground water ' samples MW-2, MW-3 and MW-4 at concentrations of 120 gg/1,47 pg/l and 36 µg/l, 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 14 February 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 CT214-0505164), quality assurance/quality control (QA/QC) reports and chain of custody form are included in Appendix C Confirmation pages of the submitted laboratory electronic digital format (EDF) files ' and depth to water measurements are included in Appendix D 4.0. SUMMARY AND CONCLUSIONS f Based on the data collected from the site, AGE concludes ' • The ground water elevations ranged from 16 51 feet to 16 65 feet below MSL Net ground water flow was inferred to be flowing towards the east an average gradient of 0 003 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,toluene and ethylbenzen are present at concentrations that exceed the DHS' Maximum Contaminant Level (MCL) for these ' compounds in drinking water • The fuel additives MTBE, 1,2-DCA and TAME were detected, MTBE in wells MW-1 ' through MW-4, 1,2-DCA and TAME in wells MW-2 through MW-4 The concentration of MTBE decreased in all ground water samples collected ' • Petroleum hydrocarbon-impact to ground water is not defined in any direction • Advanced GeoEnvironmental,Inc I