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' 06 August 2004 <br /> AGE-NC Project No 95-0128 <br />' Page 11 of 11 <br />' and xylenes concentrations in MW--5 were above the DHS' Maximum Contaminant Levels <br /> (MCLS) in drinking water <br /> • The highest concentration of MTBE (1,400µg/1) was detected in the ground water sample <br />' from on-site monitoring well MW-4 Lower or non-detectable MTBE concentrations in <br /> down-gradient and cross gradient wells define the dissolved MTBE plume toward the north <br /> and west The dissolved MTBE plume has not been defined east of well MW-11A/1 5 by well <br />' MW-17/18 (Figure 4) <br />' 5.0. RECOMMENDATIONS <br />' Based on the results of flus and previous investigations, AGE recommends <br /> • Continued ground water monitoring of the site Removal of wells MW-7, MW-9, MW-10, <br />' MW-13, MW-14 from the sampling schedule <br /> • Continued interim ground water extraction and treatment as a remedial measure, with <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 /> 6.0. LIMITATIONS <br />' Our 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 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 /> I <br />' Advanced GeoEnviron mental Inc <br />