Laserfiche WebLink
04 October 2001 <br /> AGE-NC Project No 95--0109 <br /> Page 3 of 4 <br /> The ground water flow direction was inferred to be towards the west-southwest to south on-site and <br /> toward the south to southeast, south of the site Figure 3 illustrates the contoured ground water <br /> elevations Historical ground water flow directions are summarized on Table 4 <br /> 3 2 PETROLEUM HYDROCARBON-RvIPACTED GROUND WATER <br /> Petroleum hydrocarbons were detected In ground water samples from wells MW-8, MW-9 and <br /> MW-14 TPH-g was detected at concentrations as high as 10,000 micrograms per liter (µg/1) <br /> (MW-8) BTEX compounds were detected in samples from the same wells at concentrations as high <br /> as 950 µg11 benzene,200 µg/1 toluene, 220 µg/l ethylbenzene and 710 µg/l total xylenes (MW-14) <br /> TBA was detected in the samples collected from MW-8 and MW-9 at concentrations of 31 µg/1 and <br /> 26 µg/1, respectively Other oxygenated compounds were not detected in the samples collected <br /> 1,2-DCA was detected In samples collected from wells MW-7, MW-9, MW-12 and MW-14 at <br /> concentrations as high as 140 µg/1 (MW-14) The analytical results for the September 2001 <br /> • monitoring event are presented on Table 2 Historical analytical results are summarized on Table 3 <br /> The approximate extent of dissolved TPH-g,benzene and 1,2-DCA are depicted on Figures 4, 5 and <br /> 6 <br /> The laboratory report(MAI Laboratory I D Nos 78852 through 78856)and chain-of-custody forms <br /> are included in Appendix B <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE finds <br /> • Ground water elevation decreased an average of 152 feet between the June 2001 and <br /> September 2001 sampling events The ground water flow direction is mferred to be towards <br /> the west-southwest to south on-site and toward the south to southeast, south of the site <br /> • Hydrocarbon concentrations in ground water remained relatively stable in the samples <br /> collected from wells MW-7, MW-9 and MW-12 and increased in samples collected from <br /> MW-8 and MW-14 compared to results of the June 2001 sampling event <br /> • TBA was detected in the samples collected from MW-8 and MW-9 at concentrations of <br /> 31 µg/1 and 26 µg/1, respectively Other oxygenates were not detected at the site 1,2-DCA <br /> was detected in water samples from wells MW-7, MW-9, MW-12 and MW-14 during the <br /> third quarter 2001 at concentrations as high as 140 µg/l (MW-14) <br /> Advanced GeoEnvironmeotA Inc. <br />