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14525 Highway 7 <br />Suite 104 <br />Minneapolis, MinnesoC@ 55343 <br />(952) 935-101[] · FAX (952) 935-1254 <br /> <br />April 12, 2002 <br />Project 007164.000.0 <br /> <br />GEOMATRIX <br /> <br />Mr. Terry Johnson <br />Waste Management, Inc. <br />3701 Shoreline Drive, Suite 202J <br />Wayzata, Minnesota 55391 <br /> <br />Subject: <br /> <br />P 17C Groundwater Remediation Project <br />Elk River Landfill <br />Elk River, Minnesota <br /> <br />Dear Mr. Johnson: <br /> <br />Geomatrix Consultants, Inc. has prepared this letter and attached table to present the scope and <br />estimated costs for initiating the P17C Groundwater Remediation Project. Components of the <br />project have been developed with input provided by Waste Management, Inc. and <br />representatives of the City of Elk River and Sherbume County. Also included is a <br />contingency plan which includes triggers and remedial alternatives which could be <br />implemented in the event the current system does not sufficiently remedy the volatile organic <br />compound (VOC) concentrations in th~ P17C area. <br /> <br />Scope and Estimated Costs <br />The P17C Groundwater Remediation Project consists of three phases: <br /> <br /> · Phase I, the verification of VOC distribution, includes the installation of treatment <br /> points to be utilized for groundwater sampling and treatment. Four 4-inch diameter <br /> wells were installed in January/February 2002. Baseline groundwater sampling and <br /> analysis is scheduled to take place on March 3. <br /> <br /> · Phase II, the interim remedial system implementation, will include installing treatment <br /> devices and a monitoring system to assess the effectiveness of the treatment devices. <br /> Data collected as part of Phase II will be used to design the full-scale remedial system. <br /> <br /> · Phase 115, includes the implementation of a full-scale remedial system. Phase III is <br /> anticipated to include the installation of six additional treatment points and additional <br /> monitoring points (if needed). <br /> <br />To date, costs incurred from past P17C invesiigations (1997 to 2001) and the installation of <br />Phase I treatment points amount to approximately $135,000. Estimated costs for conducting <br />the remaining scope of the groundwater remediation project are detailed in the attached table. <br /> <br />Contingency Plan <br />The proposed criteria for determining the ineffectiveness of the remedial system will be based <br />on groundwater quality in monitoring well P309C which is located approximately 60 feet up- <br /> <br />Geornatrix Consultants, Inc. <br />Engineers, Ge0[0gists, and Environmental Scientists <br /> <br /> <br />