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' 21 November 2005 <br /> AGE-NC Project No 96-0263 <br />' Page 4 of 5 <br />' • The ground water at the site was inferred to be flowing to the north-northwest at an average <br /> gradient of 0 004 foot/foot <br /> • Target analytes, including TPH-g,BTEX components,MTBE and/or TAME were detected <br />' in groundwater samples collected from wells MW-2 and MW-7 MTBE was the only target <br /> analyte detected in the samples collected from well MW-4 <br />' • The dissolved hydrocarbon plume extends northward from the former UST and dispenser <br /> areas,but not beyond the down-gradient monitoring wells(MW-5 and MW-8) The dissolved <br /> phase plume has been laterally defined Iso-concentration maps Illustrating the approximate <br />' extent of TPH-g, benzene and MTBE-impacted ground water are depicted on Figures 4, 5 <br /> and 6 <br />' • Based on chemical analyses of ground water samples, the hydrocarbon and MTBE <br /> concentrations have decreased approximately 50 to 75 %at the most impacted well location, <br /> as compared to August 2004 results TPH-g and MTBE concentrations have declined in <br />' monitoring well MW-7,since the initiation of the ozone remediation as depicted in Appendix <br /> E <br />' • 5.0. RECOMMENDATIONS <br />' Based on the findings of this investigation AGE recommends <br />' Continued quarterly monitoring of the ground water monitoring wells The third quarter 2005 <br /> sampling event was conducted in September 2005, and <br /> • Continued operation of the ozone sparge system AGE anticipates an ozone infection pilot <br />' test report will be submitted shortly following this report <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing In this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluation ofthe hydrogeologic conditions <br />' at the site for the purpose of this investigation was made from a limited number of available data <br /> points(i e ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied,is made as to the professional interpretations,opinions and <br /> recommendations contained in this report <br /> Advanced GeoEnvironmentsl,Inc <br /> I <br />