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' 09 January 2004 <br /> AGE-NC Project No 97-0326 <br /> Page 3 of 4 <br />' tb = Total thickness of free product (-0 21 foot) <br /> ds = Density of free product (gasoline at —0 75 g/ml) <br /> d,, = Density of water (-1 0 gm/ml) <br /> Ground water data is summarized on Table 1 <br /> t Ground water elevation contours based on the data for the October 2003 monitoring event are <br /> Illustrated on Figure 2 The ground water flow direction was northeast with an average hydraulic <br /> gradient of approximately 0 005 feet/feet This is the second consecutive quarter that the gradient <br />' has been in a northeasterly direction,rotated approximately ninety degrees from the south-southeast <br /> gradient normally encountered at the site <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES <br /> TPH-g was detected in samples collected from MW-2 and MW-3 at concentrations of 26,000 <br /> micrograms per liter(µg/1) and 76,000 µg/l, respectively <br />� . BTEX compounds were detected in MW-2 and MW-3 The maximum benzene concentration was <br /> detected In sample MW-2 at 9,600 µg/1, the maximum toluene, ethylbenzene and xylenes <br /> concentrations were detected in sample MW-3 at 7,600 µg/1, 8,800 µg/1 and 41,000 µg/1, <br /> respectively <br /> The fuel additives MTBE and 1,2-DCA were detected In samples MW-2 and MW-3, MTBE was <br /> detected in samples MW-2 and MW-3 at concentrations of 32 µg/1 and 77 µg/1, respectively, and <br /> 1,2-DCA was detected at concentrations of 2 1 µg11, and 42 gg/l, respectively <br /> No other fuel additives were detected at or above laboratory detection limits in the samples analyzed <br /> Analytical results of the ground water samples for the October 2003 monitoring event are <br />' summarized on Table 2 The laboratory report(CTEL Project No 214-0310187),QA/QC report and <br /> chain-of-custody form are included in Appendix C <br />' 4 0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE finds <br /> • Fourth quarter 2003 was the second consecutive quarter that the groundwater flow direction <br />' at the site was towards the northeast, previous to third quarter 2003, ground water flow had <br /> always been toward the south-southeast This change in gradient direction could be in <br /> response to ground water levels In well MW-1 now being within the screened Interval of the <br /> Advanced GeoEnvironmental,Inc <br />