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4 <br /> t I <br /> 1 rt I <br /> I <br /> � I <br /> 23 June 2003 � <br /> AGE-NC Project No 00-0769 <br />' Page 11 of 13 <br /> detected in samples MW-4D, MW-5D and MW-6D at concentrations of 150 gg/l, 370 gg/1 and <br />' 71 µg/1, respectively <br /> 11 HU5 <br /> Ground water samples from wells MW-4E and MW-5E were collected from HUS <br /> } <br /> TPH-g was detected in samples MW-4E and MW-5E at concentrations of 17,000 gg/l and 990 gg/1, <br /> respectively <br /> BTEX compounds were detected in samples MW-4E and MW-5E at maximum concentrations of <br /> 2,500 gg/l benzene, 2,400 gg/l toluene, 400 µg/1 ethylbenzene and 2,000 gg/l xylenes, in sample <br /> MW-4E <br /> The fuel oxygenates 1,2-DCA and TBA were detected In HU-5 samples 1,2-DCA was detected in <br /> samples MW-4E and MW-5E at concentrations of 130 gg/l and 20 gg/l, respectively TBA was <br /> detected only in sample MW-5E at a concentration of 180 pg/1 <br /> No other constituents of concern were detected above laboratory reporting limits in the water <br />' samples collected during the fourth quarter sampling event Analytical results of ground water <br /> monitoring well samples are summarized in Tables 3 and 4 The laboratory reports (MAY Lab IDs <br /> 0211447-01 through 0211447-031) and chain-of-custody forms are presented in Appendix H <br /> 5 0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br />' Significant concentrations of TPH-g and BTEX constituents were detected in soil samples <br /> I - ' collected from soil borings MW-4, MW-5 and B-2 at depths between 30 and 60 feet bsg <br /> Based on the analytical results of soil samples collected during the August and September <br />' 2002 investigation and previous subsurface investigations, cross sections Illustrating the <br /> Inferred vertical and horizontal extent of hydrocarbon-Impacted soil were constructed <br />' (Figures 5 and 6) Hydrocarbon-impacted soil appears to be defined vertically, although the <br /> lateral extent of Impacted soil is not defined at the site The most Impacted soil was <br /> encountered beneath the former UST locations, to depths as great as J 15 feet bsg <br />' Generally, depth to ground water at the site vaned between 20 8 and 30 2 feet bsg, ground <br /> water elevations at the site ranged between 11 38 feet (MW-8A) and 19 23 feet (MW-7D) <br /> 01 <br />' Advanced GeoEnvironmental,Inc <br /> ' I <br /> 1 I <br />