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' 08 August 2004 <br /> S AGE-NC Project No 95-0128 <br />' Page 4of4 <br /> I The highest concentration of MTBE(680µg11)was detected in the ground water sample from <br /> on-site monitoring well MW-5 Lower or non-detectable MTBE concentrations in down- <br /> gradient and cross gradient wells define the dissolved MTBE plume toward the north and <br />' west The dissolved MTBE plume has been defined east of well MW-11A/15 by well <br /> MW-17/18 All detections ofMTBE were either in excess ofthe DHS'MCL or Action Level <br /> (AL) for MTBE <br />' 5.0 RECOMMENDATIONS <br /> Based on the results of this and previous investigations, AGE recommends <br /> IContinued ground water monitoring of the site The next monitoring event is tentatively <br /> scheduled for October 2004 <br />' Removal of TPH-d analysis from the sampling schedule <br /> • Continued interim ground water extraction and treatment as a remedial measure, with <br /> lie <br /> incorporation of well EW-2 for ground water extraction Initiation of soil vapor extraction <br /> utilizing carbon based treatment due to low soil contamination detected in the newly installed <br /> soil vapor extraction wells <br /> I <br />' 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> I environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data points (i e water <br />' samples and monitoring well samples) and subsurface conditions may vary away from these data <br /> points No other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions and recommendations contained in this report <br />' Advanced GeoEnvironmental Inc <br /> I <br />