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�p <br /> � t J <br /> r , <br /> 20 December 2001 <br /> AGE-NC Project No 96-0235 <br /> I r , <br /> Page 4 of 5 , <br /> , <br /> • Ground water flow within the deeper momtored`mterval appears to have been toward the <br /> south-southwest, ground water flow in the upper interval was flowing radially toward the <br /> ' west-southwest s <br />' TPH-g,TPH-d and BTEX compounds were detected in groundwater samples collected from <br /> MW-1, MW-2 and EW-2 1,2-DCA was detected in ground water samples collected from <br /> wells MW-1, MW-2, NIW-5,MW-6A, MW-6B,MW-7 and EW-2 The petroleum-impacted <br /> ground water plume has remained relatively stable <br /> • MTBE was not detected in any of the ground water samples collected from the former UST <br />' No 3 excavation area <br /> r <br /> ' The lateral extent of the plume of impacted ground water is not well defined to the south « <br /> 1 ' t <br /> Based on the data collected from the former UST cluster area, AGE finds <br /> t - TPH-g was detected in samples collected from MW-10, NT <br /> was MW-12B, MW-13B and <br /> EW-I at concentrations as high as 65,000 µg/l TPH-d was detected in samples collected <br />'• from MW-9, MW-10, MW-11B and EW-I at concentrations as high as 20,000 �Lg/l <br /> • BTEX compounds were detected in samples collected from MW--10, MW-I IB, MW-12B, <br /> MW-13B and EW-1 Benzene was detected at concentrations as high as 1,700 µg/l <br />' Concentrations of BTEX compounds in ground water samples collected from the former <br /> UST cluster have remained relatively stable during the past five quarters <br />' MTBE was detected m the deeper screened wells MW-9, MW-11 B, MW-12B and MW-13B <br /> and m shallow wells MW-10, MW-13A and EW-1 at concentrations as high as 340 µg/1 <br />' The most impacted ground water appears to be centered around EW-1 and MW-10, deeper <br /> groundwater is less intensely impacted The lateral extent of the contamination plume in <br /> ground water is not well defined toward the east and south area of the former UST cluster <br /> • Ground water flow in the area of the former UST cluster was generally toward the east- <br /> , southeast in both the deeper monitoredrmterval and m the upper interval <br /> 5.0, rRECOMMENDATIONS <br />' Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> continued quarterly ground water monitoring The next quarterly monitoring event should be <br />' scheduled for November 2001 <br /> ti <br /> 4 J r <br /> Advanced GeoEnvtronmentA Inc <br />