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3 _ P s ] l t J 16 August 2004 S AGE-NC Project No 96-0235 I T Page 5 of 6 3 , • Monitoring well MW-10 was damaged during the Fourth Quarter 2003-6verexcavation ' activities-and was not sampled ' Based on the data collected from the former southern UST No 3 area, AGE finds • The ground water flow direction at the shallow-screened level was inferred to be towards the ' w southeast at a gradient of 0 005 ft/ft, ground water flow direction at the deep-screened level was inferred to be toward the southwest at a gradient of 0 013 ft/ft Ground water gradient and flow direction observed during the Second Quarter 2004 were similar to the previous ' quarter , I • TPH-g was detected in ,the samples collected from MW-1,h MW-2 and EW-2 at ' concentrations of 14,000 µg11, 27,000 �ig/l and 220 µg/l, respectively TPH-d was detected in the samples collected from MW-1 and MW-2 at concentrations of 1,500 µg/l and 4,000 µg/l,respectively Various BTEX compounds were detected in the samples collected ' from MW-1, MW-2 and EW-2 The detected benzene concentrations in MW-1, MW-2 and EW-2 exceeded the MCL for drinking water In addition, the toluene concentration detected • in sample MW-1 and the ethylbenzene concentrations detected in samples MW-1 and MW-2 exceeded the respective MCLS for drinking water • MTBE was not detected in any of the ground water samples collected from the former UST No 3 excavation area However, 1,2-DCA was detected in water samples MW-1,MW-2 and EW-2 at a concentration exceeding the MCL for drinking water ' The vertical extent of the contamination plume, as well as the lateral extent to the south, is not well defined 5.0. RECOMMENDATIONS iBased on the findings of the environmental activities recounted in this report, AGE recommends � 3 ' Continued quarterly ground water monitoring, and _ • Preparation of a work plan for interim remediation of ground water at the UST Cluster area 5 c � Advanced GeoEnvLronmental,Inc t 3