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09 April 2002 <br /> AGE-NC Project No 98-0497 <br />' Page 4of4 <br />' • Measured ground water elevation was approximately 35 7 feet below MSL, and was within <br /> the screened interval of each monitoring well Ground water flow direction was toward the <br /> east-southeast with a gradient of 0 0004 feet/feet Historically, flow direction at the site has <br />' been toward the east or has had no observable gradient <br /> • Contamination by TPH-g and TPH-d was encountered in the ground water sample collected <br />' and analyzed from MW-1 Concentrations of TPH-g appeared to have stabilized since the <br /> March 2001 monitoring event The detected concentration of TPH-d in the sample collected <br /> from MW-1 during the March 2002 monitoring event is higher than that detected during <br />' recent monitoring events, but is withing the range of concentrations detected since <br /> monitoring began in August 2000 TPH-g and TPH-d were not detected in wells MW-2 <br /> through MW-5 <br />' • BTEX compounds were not detected in any of the ground water samples analyzed <br /> • MTBE was not detected in any of the ground water samples analyzed Fuel additives have <br /> not been detected in ground water samples since monitoring began in August 2000 <br /> • The hydrocarbon-impacted ground water plume appears to be limited to the area immediately <br /> surrounding MW-1 The inferred areal extent of hydrocarbon-impacted ground water is <br /> illustrated in Figure 4 <br />' 6.0. RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends continued quarterly <br /> monitoring of the ground water monitoring network The next monitoring event should be scheduled <br /> for May2002 In accordance with the EHD letter dated 20 July 2001,groundwater samples collected <br /> during the next quarterly monitoring event should be analyzed for fuel oxygenating compounds <br />' 7.0. 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 Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data points(i a monitoring <br /> -wells, ground water"samples)and subsurface conditions may vary away from these data points No - <br /> other warranty, expressed or implied, is made as to the professional interpretations, opinions and <br />' recommendations contained in this report <br /> • <br />' Advanced GeaEnvironmental,Inc <br />