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' 07 February 2005 <br /> AGE-NC Project No 97-0326 <br />' Page 5 of 5 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br />' 0 The ground water elevations in HU1 wells (water table) on 29 June 2004 ranged from <br /> 2152 feet to 21 68 feet below MSL, the net ground water flow was inferred to be flowing <br />' southeast 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 The only <br />' exception was a 6 2µg/1 detection of 1,2-DCA in HU6 at well MW-913 Laterally,the highest <br /> concentrations of contaminants in HU 1 were centered around the tank-pit and dispenser areas <br /> (Figures 4 and 5), vertically, TPH-g and BTEX compounds exhibited decreasing <br />' concentrations with increasing depth <br /> • The vertical extent of ground water contamination may be influenced by downward, vertical <br />' ground-water flow between HU1 and HU2, HU2 and HU4, and HU4 and HU6 <br /> • The lateral and vertical extent of petroleum hydrocarbon-impacted ground water have not <br /> been defined <br /> 5.0. RECOMMENDATIONS <br /> 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 September 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 (e g , 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 /> Advanced GcoEnvironmental Inc <br />