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' 22 June 2004 <br /> AGE-NC Project No 95-0167 <br />' Page 3 of 4 <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected In the water samples collected from monitoring well MW-1 at a concentration <br />' of 4,300 micrograms per liter(gg/l) <br /> BTEX compounds were detected in the water samples collected from monitoring well MW-1 at <br />' concentrations of 760 gg/l of benzene,720 gg/l of toluene, 92 gg/l of ethylbenzene and 530 gg/l of <br /> xylenes <br /> 1,2-DCA was detected n sample MW-1 at a concentration of 17 gg/l No other fuel additives were <br /> detected at or above laboratory detection levels in the ground water samples <br /> Analytical results of ground water samples collected during the March 2004 monitoring event are <br /> summarized on Table 2 The laboratory report(CTEL Project No CT214-0403192),QA/QC report <br /> and chain-of-custody form are included in Appendix D Figure 4 depicts the estimated lateral <br />' distributions of dissolved TPH-g and benzene in ground water <br /> • 4.0. SUMMARY AND CONCLUSIONS <br />' Data collected at the site indicates that <br /> • The ground water flow direction during this monitoring event was toward the west-northwest <br />' at an average gradient of 0 009 feet/feet Ground water flow at the site has historically been <br /> towards the northwest Ground water flow direction is not well defined south of the former <br /> UST area, <br /> • Moderate to high concentrations of TPH-g and BTEX occur in ground water in the area of <br /> monitoring well MW-1 However,TPH-g and BTEX concentrations from samples collected <br /> from well MW-1 have decreased to almost half the concentrations detected during the fourth <br /> quarter 2003 sampling event Additionally,TPH-g and BTEX concentrations detected during <br /> the first quarter 2004 are the lowest they have been since sampling began TPH-g and BTEX <br />' concentrations were not detected this quarter in the samples collected from well MW-2 This <br /> is the second consecutive quarter that petroleum hydrocarbon concentrations were not <br /> detected In well MW-2 <br /> e MTBE was not detected this quarter in any,.of the ground water samples 1,2-DCA was - <br /> detected for the second consecutive quarter in well MW-1 at a concentration of 17 gg/l <br /> MTBE was below laboratory reporting limits in well MW-1 for the fist time since the well <br />' was installed in 1999 <br /> • <br />' Advanced GeoEnviron mental,Inc <br />