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l , y <br /> 1 <br /> 10 October 2005 <br /> AGE-NC Project No 04-1168 <br />' Page 6 of 7 <br /> 34 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in ground water samples collected from wells MW-1 through MW-3 at <br />' concentrations of 540 micrograms per liter(µg11), 330 µg/l and 220 µg/1, respectively(Figure 4) <br /> The BTEX compounds toluene and xylenes were detected in ground water samples MW-1 through <br />' MW-3 at maximum concentrations of 8 9 µg/1 and 29 µg/1, respectively, from sample MW-1, <br /> ethylbenzene was detected only in sample MW-1 at a concentration 2 1 µg/1 Benzene was not <br /> detected <br />' The fuel additive MTBE was detected in all ground water samples at concentrations between <br /> 150 µg/1 (MW-2) and 330 µg/1 (MW-1), in addition, 1,2-DCA was detected in one ground water <br />' sample (MW-2) at a concentration of 2 9 µg/1 A Map of MTBE concentrations is presented as <br /> Figure 5 <br />' No other constituents of concern were detected at or above laboratory detection limits in the ground <br /> water samples analyzed The analytical results of the ground water samples collected on 05 August <br /> 2005 are summarized on Table 3 The laboratory report (CTEL Project No CT214-0508043), <br />' QA/QC report, and chain-of-custody form are included in Appendix G <br />' 4.0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE concludes <br /> • The subsurface soil consists predominantly of fine-grained, clayey and sandy silts and silty <br />' clays, coarser, silty sand was detected only in borings MW1 and MW2 at 70 feet bsg <br /> Laboratory analysis of ten soil samples submitted for analysis detected TPH-g and BTEX <br /> (total xylenes only) at very low concentrations in four of the ten samples <br />' • At the time of the August 2005 quarterly monitoring event, the ground water flow was <br /> inferred to be southeast under an average hydraulic gradient of approximately 0 001 ft/ft <br />' • Analytical results of ground water samples MW-1 through MW-3 collected on 05 August <br /> 2005 detected TPH-g, toluene and xylenes in all samples at maximum concentration of <br /> 500 µg/1, 8 9 µg/l and 29 µg/1, respectively, in the sample from the down-gradient well <br />' MW-1 In addition, ethylbenzene was detected in one sample(MW-1) at a concentration of <br /> 2 1 µg/1 <br />' • The fuel additive MTBE was detected in all ground water samples at a maximum <br /> concentration of 330 µg/l (MW-1) In addition, 1,2-DCA was detected in the ground water <br /> sample from well MW-2 at a concentration of 2 9 µg/1 <br /> Advanced GeoEutizronmcntai,Inc <br />