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I 04 Apr112001 AGE-NC Project No 98-0505 Page 4of5 • 1,2 - DCA was detected in ground water samples collected from each well sampled Concentrations ranged from 5 2 gg/l (MW-4) to 180 gg/1 (MW-7) EDB was not detected in any of the ground water samples collected during the Match 2001 monitoring event I Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables ' 2 and 3 The laboratory reports for the quarterly monitonng event (MAI Lab Nos 61679 through 61686) QA/QC reports and chain-of-custody form are included in Appendix B IConcentrations of TPH-g and benzene in ground water are illustrated on Figures 4 and 5 I4.0. SUMMARY AND CONCLUSIONS The findings of the 01 March 2001 site Investigation events include the following I • Contamination by TPH-g was encountered in ground water samples collected from each monitoring well at the site (MW-1 through MW-8) Concentrations as high as 21,000 gg/l were reported • BTEX constituents were detected in seven of the eight ground water monitoring wells with concentrations as high as 7,900 4g11 (benzene), 20,000 gg/l (toluene), 2,400 gg/l (ethylbenzene) and 11,000 gg/l (total xylenes) • MTBE and other fuel oxygenates were not detected in any of the ground water samples collected • 1,2-DCA was detected in ground water samples collected from each monitoring well at the I site EDB was not detected in any of the ground water samples collected during the March monitoring event • The horizontal and vertical extent of contamination related to the former UST has not yet Ibeen defined In soil or ground water • Measured ground water elevation is approximately 11 4 feet below msl, and was within the screened interval of the two shallow monitoring wells (MW-7 and MW-8) Ground water was approximately 10 feet above the screened intervals of MW-1 through MW-5 and was approximately 40 feet above the screened interval of the deep well MW--6 I i Advanced GcoEnvironmental,Inc I