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r 19 January 2004 AGE-NC Project Na 96-0235 ' (Page 7 of 8 1 ' • TPH-g was detected in groundwater sample collected from MW-10 at a concentration of 670 µg/1 • Benzne, ethylbenzene and xylenes were detected in water sample collected from MW-10 ' The detected benzene concentration in sample MW-10 exceeded the DHS' Maximum ` Contaminant Level (MCL) in dnnkmg,water I • MTBE was detected by EPA Method 8260B in the shallow-screened well MW-10 and in the ` deep-screened wells MW-9, MW-13B and MW-14B at concentrations as high as 66 gg/l , (MW-9) The MTBE concentrations were above the DHS' Primary MCL of 13 �gll in ' drinking water • 1,2-DCA was detected in ground water samples collected from wells MW-11B and , MW-14B, the detected concentrations exceeded the DHS' MCL t In the former UST cluster area, the most impacted ground water appears to be centered around MW-10 The vertical extent of the contamination plume,as well as the lateral extent ' east and south of the former UST cluster, are not well defined ' Based on the data collected in November from the former UST No 3 area, AGE finds 1 � • The ground water flow direction at the shallow-screened level was Inferred to be towards the ' east at a gradient of 0 006 ft/ft, ground water flow direction at the deep-screened level was Inferred to be toward the south-southwest at a gradient of 0 014 ft/ft Ground water gradient and flow direction observed during the fourth quarter 2003 were similar to the previous ' quarter v S r o r • TPH-g was detected in the samples collected from MW-1 and MW-2 at concentrations of 6,200 µg/1 and 10,000 gg/l, respectively, TPH-d was detected in the sample collected from ' MW-2 at a concentration of 12 gg/l BTEX compounds were detected in the same samples The detected benzene concentrations in MW-1 and MW-2 exceeded the MCL for drinking water,the toluene, ethylbenzene and total xylenes concentrations detected in sample 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, f` ' No 3 excavation area However, 1,2-DCA was detected in water samples MW-2 at a concentration exceeding the MCL for.drinkmg water r `The vertical extent of the contamination plume, as well as the lateral extent to the south,;are not well defined ' } s 1 Advanced GeoEnvironmental,Inc 9 - * 1 r I xl