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I 6 June 1995 ' AGE-NC-95-0128 Page 3 of 4 ' Ground water elevation contours, based upon data collected on 29 March 1995, are depicted in Figure 3 The ground water gradient and flow direction were calculated to be 0 002 ft/ft directed N 12° E(Figure 3) Previously, ground water flow direction was calculated to be 0 004 ft/ft directed ' N 750 E The change in ground water direction is approximately 60* to the north ' It should be noted that due to the significant rise in ground water at the site, the water level in MW-1 is ten feet above the screened interval and approximately four feet above the screened intervals in MW-2 and MW-3 I 4 2 PETROLEUM HYDROCARBON-IMPACTED GROUND WATER INo TPH-g, TPH-d or BTE&X were detected in MW-2 or MW-3 TPH-g and TPH-d were detected in VW-1 at 230,000 µg/L(part per billion,ppb)and 6,800 ppb, respectively Benzene, toluene, ethyl ' benzene and total xylenes were detected in VW-1 at 25,000 ppb, 41,000 ppb, 3,100 ppb and 18,000 ppb, respectively The analytical results of the ground water samples are summarized in Table 2 The laboratory report and chain of custody are included in Appendix B 5.0. CONCLUSIONS AND RECOMMENDATIONS The detection of elevated concentrations of hydrocarbon compounds in VW-1 indicates that this well tis located in the immediate vicinity of the hydrocarbon plum However, the non-detection of hydrocarbons in MW-2 and MW-3 suggests that the impacted of hydrocarbons has not migrated beyond these wells Remediation of impacted soil should prevent future migration of hydrocarbons from the soil to the ground water and will augment natural degradation of the hydrocarbons in the ground water We recommend that the next quarterly ground water monitoring be scheduled for June 1995 Based on the change of the ground water direction, MW-1 should be included in the next sampling event I