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. 20 December 2001
<br /> I AGE-NC Project No 00-0769
<br /> Page 4'of 5
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<br /> TPH-g was detected'in ground water samples collected from monitoring wells MW-1,
<br /> MW-2A, MW-2B, MW-3A and MW-313 TPH-g concentrations ranged from 87 µg/l in
<br /> MW-2A to`230,000 µg/1 in MW-1 Benzene was detected in samples collected from wells
<br /> MW-1, MW-2A, MW-213, MW-3A and MW-3B at concentrations of 34,000 µg/l, 12 gg/l,
<br /> 1,100 µg/l, 2,200 µg/l and 460 4g11, respectively Toluene, ethylbenzene and total xylenes
<br /> were detected in the groundwater samples collected from monitoring wells NIW-1,MW-2A,
<br /> MW-2B, MW-3A and MW-3B The highest concentrations were detected in the sample
<br /> collected from MW-1 at concentrations of 46,000 µg/1(toluene), 2,300 µgd(ethylbenzene)
<br /> and 12,000 µg/1 (total xylenes)
<br /> • 1,2-DCA was detected in ground water samples collected from MW-1, MW-2A,MW-2B
<br /> and MW-3B at concentrations of 2,900 µg/1, 5 0 µg/1, 310 µg/1 and 7 0 µg/l, respectively w r
<br />' EDB was not detected in any of the ground water samples collected during the December
<br /> 2001 monitoring event
<br />' Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in
<br /> Tables 2 and 3 The laboratory reports for the quarterly monitoring event (MAI Lab IDs 84755
<br /> through 84759) QA/QC reports and chain-of-custody form are included in Appendix B
<br />' 5.0. SUMMARY AND CONCLUSIONS
<br /> The findings of the December 2001 site investigation event include the following
<br />' Contamination b TPH- and BTEX constituents was encountered m groundwater samples
<br /> • y g �"
<br /> collected,-from the five on site monitoring wells (MW-1, MW-2A, MW-213, MW-3A and
<br />' MW-313) Concentrations as high as 230,000 µg/l TPH-g, 34,000 µg/1 benzene, 46,000 µg/1
<br /> toluene, 2;300 µg/l ethylbenzene and 12,000 µg/1 total xylenes were detected
<br /> • 1,2-DCA was detected in ground water samples collected from monitoring wells MW-1,
<br /> MM
<br /> , W-2A, W-2B and MW-3B at concentrations as high as 2,900 µg/1 (MW-1) EDB was
<br /> W not detected m any of the ground water samples collected during the fourth quarter 2001 r'
<br /> monitoring event
<br /> • Concentrations of contamination have remained relatively stable in monitoring wells MW-1,
<br /> MW-213,MW-3A and MW-3B since ground water monitoring began in May 1998 However,
<br /> concentrations have steadily decreased in MW-2A during the same period
<br /> • The horizontal and vertical extent of contamination related to the former UST has not yet
<br /> been defined in soil or ground water
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<br /> Advanced GeoEavtronmental,Inc
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