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i I17 May 2005 • AGE-NC Project No 96-0263 Page 4 of 5 • The ground water at the site was Inferred to be flowing to the north-northwest at an average gradient of 0 004 foot/foot • Target analytes, including TPH-g,BTEX components,MTBE and/or TAME were detected In ground water samples collected from wells MW-2 and MW-7 MTBE was the only target analyte detected in the samples collected from well MW-4 I • The dissolved hydrocarbon plume extends northward from the former UST and dispenser areas,but not beyond the down-gradient monitoring wells(MW-5 and MW-8) The dissolved phase plume has been laterally defined Iso-concentration maps Illustrating the approximate I extent of TPH-g, benzene and MTBE-Impacted ground water are depicted on Figures 4, 5 and ' Based on chemical analyses of ground water samples, the hydrocarbon and MTBE concentrations have decreased as compared to previous results MTBE concentrations have declined in monitoring well MW-7, since the initiation of the ozone remediation as depicted Iin Appendix E '• 5.0. RECOMMENDATIONS IBased on the findings of this Investigation AGE recommends • Continued quarterly monitoring of the ground water monitoring wells The second quarter 2005 sampling event is scheduled for June 2005, and • Continued operation of the ozone sparge system AGE anticipates an ozone injection pilot test report will be submitted during the second quarter 2005 I 6.0. LINIITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions at the site for the purpose of this Investigation was made from a limited number of available data points(I a ground water samples)and subsurface conditions may vary away from these data points No other warranty,expressed or implied,Is made as to the professional Interpretations,opinions and recommendations contained in this report Advanced CeoEnvironmentsl,Inc