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Mr. Terry Johnson <br />Waste Management <br />April 12, 2002 <br />Page 2 <br /> <br />GEOMATRIX <br /> <br />gradient of compliance boundary well P305C. In the event that VOC concentrations are <br />verified, above Minnesota Department of Health, Health Risk Limits (HRLs) in well P-309C, <br />the following contingency actions, at a minimum, will be considered: <br /> <br />1) <br /> <br />Hydraulic control to increase the groundwater residence time within the existing treatment <br />array. The hydraulic control would likely entail extracting groundwater downgradient of <br />the treatment array and re-injecting groundwater up-gradient of the treatment array. <br /> <br />2) <br /> <br />Additional or alternative in-sim nutrient enhancement. The treatment points can be <br />utilized for the introduction of additional nutrients or alternate electron acceptors to <br />enhance microbiological activity capable of reducing VOC concentrations. <br /> <br />3) <br /> <br />Hydraulic capture. The treatment array and existing monitoring wells will allow for <br />effective groundwater extraction and hydraulic monitoring within the P17C area. Options <br />for on-site groundwater treatment and disposal would be preferable to off-site disposal. <br /> <br />Please contact us should you have any 'questions or are interested in discussing the <br />groundwater remediation project in greater detail. <br /> <br />Sincerely yours, <br />GEOMATRIX CONSULTANTS, INC. <br /> <br />Project Hydrogeologist <br /> <br />Attachment <br /> <br />cc: MS. Deb Dehn, Elk River Landfill <br /> Ms. Deb McDonald, Waste Management, Inc. <br /> <br />P:W 164\Correspondence\Client Correspondence~P! 7C CE Cov.doc <br /> <br /> <br />