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. 20 April 2005 AGE-NC Project No 95-0109 Page 6 of 6 • 1,2-DCA concentrations have decreased to non-detect levels in the samples collected from wells MW-1 and MW-3 In addition, 1,2-DCA detected during the March 2005 sampling event from wells MW-4,MW-5 and MW-14 were the lowest concentrations recorded over the past 5 sampling events 1,2-DCA concentrations increased from non-detect levels to low concentrations ranging between 3 9 µg/l and 4 9 µg/1 in the samples collected from wells MW-9 and MW-16 • Based on the data acquired over the past year, it appears the petroleum hydrocarbon contaminant plume and 1,2-DCA plume have decreased in size Benzene concentrations have been declining throughout 2004 and were non-detect during the first quarter of 2005 in all wells sampled TPH-g and 1,2-DCA plumes are still present at the site but are declining in size Treatment of the remaining TPH-g plume may be required 5.0. RECOMNENDATIONS Based upon data collected from the site, AGE recommends • • Continued quarterly ground water monitoring as required by Clean-up and Abatement Order No 93-701 The next ground water monitoring event will be scheduled for June 2005 • Continuation of the 24-week ozone infection pilot test Ozone injection began on 14 October 2004 6.0. LINUTATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon field measurements and analytical results provided by an independent laboratory Evaluations of the geologic/liydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (I a ground water samples) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report Advanced GeoEnvironmental,Inc