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I30 April 2005 <br /> AGE-NC Project No 03-1070 <br /> Page 3 of 4 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from the wells at a maximum concentration <br />' of 23,000 micrograms per liter(µg11)in well MW-2 One or more BTEX compounds were detected <br /> in ground water samples collected from wells MW-1 through MW-4 at maximum concentrations of <br /> 4,500 µg/l benzene (MW-3), 880 µg/1 toluene (MW-2), 200 pg/l ethylbenzene (MW-3), and <br /> 1,200 µg/1 total xylenes (MW-3), respectively <br /> Three fuel additives were detected in the analyzed samples MTBE was detected in ground water <br />' samples collected from wells MW-1 through MW-4 at a maximum concentration of <br /> 200,000 gg/l (MW-2), 1,2-DCA was detected in ground water samples MW-2 and MW-3 at <br /> concentrations of 9 2 µg/1 and 85 µg/1, respectively, and TAME was detected in ground water <br />' samples MW-2 and MW-3 at concentrations of 38 gg/1 and 42 pg/I <br /> No other analytes were detected at or above laboratory detection limits in the ground water samples <br /> analyzed The analytical results of the ground water samples collected on 14 February 2005 are <br /> summarized in Table 2 A plane view map depicting the lateral extent of petroleum hydrocarbon <br /> • contamination is illustrated on Figure 4 The laboratory report(CTEL Project No CT214-0502088), <br /> quality assurance/quality control (QA/QC) reports and chain of custody form are included in <br /> Appendix C Confirmation pages of the submitted laboratory electronic digital format (EDF) files <br /> Iand depth to water measurements are included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE concludes <br /> • The ground water elevations ranged from 19 18 to 20 57 feet below MSL Net ground water <br /> flow was inferred to be flowing towards the west, away from the former UST area at an <br /> average gradient of 0 034 ft/ft <br /> • TPH-g and BTEX compounds were detected in ground water samples collected from wells <br /> I MW-1 through MW-4 The BTEX compounds benzene and toluene are present at <br /> concentrations that exceed the DHS' Maximum Contaminant Level (MCL) for these <br /> compounds in drinking water <br /> • The fuel additives MTBE, 1,2-DCA and TAME were detected, MTBE in wells MW-1 <br /> through MW-4, 1,2-DCA and TAME in wells MW-2 and MW-3 The concentration of <br /> MTBE detected in the current up-gradient well MW-2 increased significantly during the last <br /> quarter <br /> • Petroleum hydrocarbon-impact to ground water is not defined in any direction <br /> Advanced GeoEnv►ronmental,Inc <br />