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I <br /> I <br /> 15 November 2004 -, <br /> AGE-NC Project No 96-0235 <br /> Page 5 of 5 <br /> was inferred to be toward the southwest at a gradient of 0 014 ft/ft Groundwater gradient <br /> ` and flow` direction observed during the third quarter 2004 were similar to the previous <br /> r _ <br /> quarter <br /> TPH-g was detected in the samples collected from MW-1, MW-2 and EW-2 at <br /> concentrations of 13,000 1 10 000 1 and 780 1, respectively TPH-d was detected <br /> µti , µlb ! !�� p Y <br /> in the samples collected from MW-1 and MW-2 at concentrations of 1,800 gg/l and <br />' 6,100 gg/l,respectively Various BTEX compounds were detected in the samples collected <br /> from MW-1, MW-2 and EW-2 The detected benzene concentrations in MW-1, MW-2 and <br /> EW-2 exceeded the MCL for drinking water In addition,the toluene concentration detected <br /> in samples MW-1 and MW-2 and the ethylbenzene concentrations detected in samples MW-1 <br /> and MW-2 exceeded the respective MCLs for drinking water <br /> • MTBE was riot detected in any of the ground water samples collected from the former UST <br /> No 3 excavation area However, 1,2-DCA was detected in the water samples from MW-2 <br /> and EW-2 at concentrations exceeding the MCL for drinking water <br /> • <br /> The vertical extent of the contamination plume, as well as the lateral extent to the south, is <br /> not well defined <br /> 5.0 RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends, <br /> • <br /> Continued quarterly ground water monitoring, and. <br /> • Preparation of a work plan for Interim remediation of shallow ground_water at the UST <br /> ' Cluster area <br /> 4 I 5 A <br /> 6.0 FLIMITATIONS r <br /> ,I <br /> rOur 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 upon <br /> analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions <br /> I at the site for the purpose of this investigation was made from a limited number of available <br /> subsurface data points (i e ground water samples from ground water monitoring,wells) and <br /> subsurface conditions may vary away from these data points No other warranty, expressed or <br /> implied, is made as to the professional interpretations, opinions and recommendations contained in <br /> this o <br /> re rt <br /> p <br /> A <br /> � Advanced GeoEnvironmentai,Inc <br /> I <br /> I f I I I <br /> 1 S , <br />