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l <br /> 1 ' <br /> . 28 June 2004 <br /> AGE-NC Project No 01-0877 <br /> Page 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I <br /> TPH-g was detected in all ground water samples at concentrations ranging from 56,000 micrograms- <br /> 1 per liter(µg/1)in sample MW-4 to 91,000 µg/1 in sample MW-3 BTEX compounds were detected <br /> in water samples collected from all wells, benzene was detected at concentrations of 33,000 µg/1, <br /> 23,000 µg/l, 48,000 µg/1 and 300 µg/1, respectively <br />' 1,2-DCA and EDB were detected in the ground water samples collected from wells MW-1 through <br /> MW-4,with the exception of EDB in well MW-4,at maximum concentrations of 110 jig/] (MW-2) <br /> and 74 µg/l (MW-1), respectively ` <br /> Concentration maps depicting the approximate distribution of dissolved TPH-g and benzene are <br />' presented in Figures 4 and 5, respectively No other target analytes were detected at or above <br /> laboratory detection limits in the ground water samples analyzed The analytical 'results of ground <br /> water samples collected on 14 January 2004 are summarized in Table 3 The laboratory report <br /> (CTEL Project No CT214-0401073), QA/QC report and chain-of-custody form are included in <br /> Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' The following conclusions were drawn from the results of this investigation <br /> • During First Quarter 2004, the average ground water elevation at the site was 17 23 feet <br />' below MSL Ground water flow was inferred to be towards the northeast under a gradient of <br /> 0 003 ft/ft <br />' a High concentrations of TPH-g and BTEX compounds were detected in all monitoring wells <br /> during the first quarter 2004 The highest concentrations of contamination was detected near <br /> the area of well MW-1 and MW-3,near the site These locations correspond to the location <br />' of the former UST #3, one the possible mayor release point(s) of the UST system <br /> • In addition, 1,2-DCA and EDB were detected in wells MW-1 through MW-4, with the r <br /> exception of EDB in well MW-4,up-gradient ofthe release area,at maximum concentrations <br /> of 110 µg/l (MW-2) and 74 µg/1 (MW-1), respectively <br /> Y <br /> Advanced GeoEnvironmental,Inc <br /> r , <br /> 1 <br />