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C - <br /> t Y f <br /> I rr• 5 20 July 2000 <br /> AGE-NC Project No 95-0109 <br /> T Page 3 of 4 <br /> south, south of the site Figure 3 illustrates the contoured ground water elevations Historical ground <br /> I water flow directions are summanzed on Table 4 <br /> 3 2 PETROLEUM HYDROCARBON-IMPACTED 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 5,400 micrograms per liter(µg11) BTEX <br /> compounds were detected in samples from the same wells at concentrations as high as 120 µg/1 + <br /> II benzene, 30µg/1 toluene, 150 µg/1 ethylbenzene and 220 1ug/1 total xylenes <br /> TBA was detected in the sample collected from MW-8 ata concentration of 18 µg/1 Other <br />' bxygenated compounds were not detected in the samples collected 1,2-DCA was detected in <br /> samples collected from all the wells sampled at concentrations as high as 56 µg/1 The analytical <br /> results for the June 2001 monitoring event are presented`on Table 2 Historical analytical results are <br /> summarized on Table 3 The approximate bxtent of dissolved TPH-g, benzene and 1,2-DCA are <br /> depicted on Figures 4, 5 and 6 <br />' • The laboratory report(MAI Laboratory I D Nos 71352 through 71356) and chain-of-custody forms <br /> are included in Appendix B <br /> 1 <br /> 5 <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE finds <br />' • Ground water elevation decreased an average of 166 feet between the March 2001 and June <br /> ' 2001 sampling events The ground water flow direction is inferred to be towards the <br /> west-southwest on-site and toward the south,,south of the site <br />' • Hydrocarbon concentrations in ground water remained relatively stable in the samples <br /> collected from wells MW-7, MW-8, MW-9,MW-12 and MW-14 compared to results of the <br />' March 2001 sampling event 0 1 <br /> • TBA was detected in the ground water sample collected from MW-8 during the June 2001 <br /> sampling event Other oxygenates were nondetected at the site 1,2-DCA was detected in <br /> water samples from all five wells sampled'during the second quarter 2001 <br /> I <br /> Advanced GeoEnvironmentai,Inc <br /> 5 <br />