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* i <br /> ,5 <br /> li <br />' 11 November 1998 <br /> AGE-NC Project No 95-0121 <br /> Page 3bf15 <br /> (Figure 3) Ground water was inferred to be flowing toward the northeast over most of the site ' ` <br />' However, due to the low ground water gradient at the site, slight variations In ground water <br /> measurements could greatly modify the inferred ground water flow direction ° <br /> ey Y <br /> 3 2 DISSOLVED OXYGEN MEASUREMENTS <br /> 1 <br /> During the August 1998 ground water monitoring event, dissolved oxygen measurements were <br /> recorded at the conclusion of purging the momtonng wells Dissolved oxygen measurements ranged <br />' from 3 2 percent in MW-9 to 9 8 percent in wells MW-3 and MW-8 Results of dissolved oxygen <br /> in ground water samples are contained with the stabilization data sheets In Appendix A ' <br />' 33 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> 1 TPH-g was detected In ground water samples collected from MW-1 through MW-4 and MW-7 at <br /> concentrations ranging between 14,000 and 54,000 parts per billion (ppb, reported as micrograms <br /> per liter) TPH-d was detected in samples collected from monitoring wells MW-1 through MW-4 <br /> and MW-7 at concentrations ranging up to 5,400 ppb, the laboratory report Indicated that the TPH-d <br /> chromatograms did not have typical diesel patterns <br /> BTE&X compounds were detected in samples collected from wells MW-1 through MW-4 and MW- <br /> 7 at concentrations ranging up to 12,000 ppb(benzene,MW-3),MTBE was detected in ground water <br />' samples collected from MW-5, MW-6, and MW-9 at concentrations ranging up to 4 5 ppb (MW-5) ,r <br /> MTBE was detected in samples collected from MW-1, MW-2, and MW-5 at concentrations as high <br />' as 120 ppb, TBA was detected In MW-1 at a concentration of 300 ppb DIPS, ETBE, and TAME <br /> were not detected in the laboratory analysis of any ground water samples <br />' The laboratory reports (Castle Analytical Laboratory Reference Number 1710 and McCampbell <br /> Analytical Inc Lab I D 93826 to 93834)and chain-of-custody forms are presented in Appendix B, <br /> Ithe results of the analysis are contained in Table 2, <br /> 4.0. DISCUSSION AND CONCLUSIONS ` <br /> 1 <br /> Based upon data collected during the'August 1998 inomtonng, AGE concludes <br /> t <br /> • Ground water was inferred to be flowing toward the northeast over most of the site Due to <br /> the low ground water gradient at the site, slight variations in ground water measurements <br /> Advanced CcoEnvironmentat,Inc. <br /> ' 1 <br /> i <br /> 5 ' <br />