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Ms. Lori Duncan <br /> June 12, 2007. <br /> CONESTOGA-ROVERS <br /> &ASSOCIATES <br /> CONCLUSIONS <br /> Current MTBE'concentrations in groundwater.;are low. The MTBE plume does not appear to be <br /> migrating significantly, which is consistent with the lithology and hydrogeologic conditions at this site. <br /> No known receptors are threatened by the MTBE plume. Minimal MTBE mass remains in groundwater. <br /> A mass flux evaluation predicts that potential receptors (supply wells) are not threatened by the MTBE <br /> plume. Current remedial_activities are neither efficient nor cost-effective. <br /> RECOMMENDATIONS <br /> Based on the conclusions of:this site assessment, CRA recommends stopping vacops and implementing µ <br /> monitoring natural attenuation, <br /> 1667 7 <br /> Worldwide Engineering,Environmental;Construction,and IT Services <br />