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l - <br /> 24 October 2003 <br /> AGE-NC Project No 97-0312 <br /> rPage 4 of 4 <br />' 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br />' • Ground water elevation increased approximately 0 9 feet at the site between the February <br /> 2003 and the May 2003 monitoring events The inferred ground water flow direction is <br />' toward the west-northwest The average ground water gradient was 0 0006 ft/ft across the <br /> site <br />' • During the May 2003 monitoring event TPH-g and benzene were detected in the water <br /> sample collected from monitoring well UST-5 MTBE was detected in the sample collected <br /> from well UST-6 <br /> + During the May 2003 monitoring event 1,2-DCA was detected in samples UST-5 and UST-6 <br /> at concentrations above the DHS Maximum Contaminant Level (MCL) of 0 5 µg/l <br />' • The reported concentrations and lateral extent of analytes of concern have remained <br /> relatively stable during the past three years of monitoring Based on the analytical results of <br /> the ground water sample collected from UST-7, the vertical extent of petroleum <br /> hydrocarbon-impacted ground water at the site appears to be limited to the uppermost <br /> hydrologic zone The source of the tetrachloroethene detected in UST-7 is unknown to AGE <br /> and may be from an off-site source <br />' 50. RECOMMENDATIONS <br /> Based on the results of this and previous quarterly ground water monitoring events, AGE <br />' recommends continued monitoring of the on-site monitoring and domestic wells <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 mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br />' available data points (i e monitoring wells and domestic well samples) and subsurface conditions <br /> may vary away from these data points No other warranty, expressed or implied, is made as to the <br />' professional interpretations, opinions and recommendations contained in this report <br /> Advanced GcoEnvironmental,Inc <br /> 1 <br />