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i16 February 2005 <br /> AGE-NC Project No 97-0326 <br /> IPage 5 of 5 <br /> • The ground water elevations in HU I wells(water table)on 23 September 2004 ranged from <br /> 22 89 feet to 23 28 feet below MSL,the net ground water flow was inferred to be toward the <br /> south to southwest at a gradient of approximately 0 004 ft/ft <br /> • TPH-g and BTEX compounds were detected in ground water samples collected from all <br /> HUs, but the fuel additives MTBE and 1,2-DCA were detected mostly in HU1 D1PE was <br /> detected in samples from HU2 and HU4 Laterally, the highest concentrations of <br /> contaminants in HU1 were centered around the tank-pit and dispenser areas (Figures 4 <br /> and 5), vertically, TPH-g and BTEX compounds exhibited decreasing concentrations with <br /> Increasing depth <br /> • The vertical extent of ground water contamination may be influenced by downward, vertical <br /> ground water flow between HU 1 and HU2, HU2 and HU4, and HU4 and HU6 <br /> • The lateral and vertical extents of petroleum hydrocarbon-impacted ground water have not <br /> been defined <br /> 5.0. RECOMMENDATIONS <br /> 1 • Based on the findings of this investigation, AGE recommends continuation of the quarterly ground <br /> water monitoring program The next monitoring event was performed in December 2004 <br />' To date, AGE has installed three of the eight monitoring wells proposed in the AGE-prepared <br /> Additional Monitoring Wells Work Plan,dated 26 July 2002,these three were on-site wells Off-site <br />' monitoring wells will be installed pending resolution of permitting and bond issues <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 of the geologic/hydrogeologic <br />' conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (l e , ground water samples) and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions, and recommendations contained In this report <br /> 0 <br />' Advanced GeoEnrironmental,Inc <br />