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i <br /> I <br /> ' ° t 26 January 2004 - +s <br /> • } <br /> AGE-NC Project No,,97-0312 , <br /> Page 4 of 4 <br /> 1 j <br /> t <br /> S + <br /> 4.0. DISCUSSION AND CONCLUSIONS ' <br /> Based upon data collected from the site, AGE concludes <br />' • Ground water elevation Increased approximately 2 3 feet at the site between the September <br /> 2003 and December 2003 monitoring events The Inferred ground water flow direction is <br /> toward the northeast The ground water gradient was approximately 0 0005 ft/ft across the <br /> site <br />" • During the December 2003 monitoring event TPH-g, benzene and toluene were detected in <br />' the water'sample collected from monitoring well UST-5 MTBE was detected in the sample ; <br /> collected from well UST-6 <br /> • During the December 2003 monitoring event the maximum concentration of 1,2-DCAwas1 ' <br />' detected in the sample collected from well UST-5 at 390 µg/1 The detected concentration <br /> h 1 <br /> was above the DHS Maximum Contaminant Level (MCL) of 0 5 [g/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 /> hydrogeologic,zone The source of the PCE detected in UST-7 is unknown to AGE and may <br /> be frorh an off-site source <br /> , <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 /> „ <br /> Our professional services were performed usithat atfidegree of care and skill ordinarily exercised by <br />' environmental consultants practicing in this ortsimllar 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 numberi,of <br /> t available data points (I a 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 /> 1 r <br /> r { <br /> r Advanced GeoEnvironmental,Inc <br /> wI <br />