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"" JtJlC2 1993 • #' 0-' iherburne County, Minnesota Pollution Elk River Control Agency r' RECEIVED June 8, 1998 Debra McDonald �,,.. �.r�1 USA Waste Services, Inc. -- 825 East 2nd Street Blue Earth, MN 56013 RE: Elk River Landfill, Application for Permit Modification Dear Ms. McDonald: The following comments are a summary of the concerns and requirements from the Minnesota Pollution Control Agency (MPCA), Sherburne County and the City of Elk River regarding your Application for Permit Modification, dated April 1998. 1. The final cover system shall be designed according the municipal solid waste (MSW) standards. • 2. It is noted that the liner and leachate collection system for the-proposed demolition cell does not meet design and construction standards for MSW and/or industrial waste disposal sites. As a result, only demolition debris and new construction debris will be allowed for disposal in the proposed area. See Attachment A for definitions of allowable waste materials. 3. A liner system shall be required for the demolition debris horizontal expansion area and shall be required to have a minimum six inches of clay and a 40 mil flexible membrane liner. The clay shall have a maximum permeability of 10"7 cm/sec. See Attachment B for QA/QC requirements for liner construction. 4. The 906,300 cubic yards of air space capacity proposed for the proposed development shall be counted as a portion of the 4,926,200 cubic yards of"reserve capacity" for the site. 5. The plan sheets shall be revised to show the development of the site in two-year phases. Development plans shall indicate the sequence of filling for each phase, access to the working face and placement of final cover. The engineering report shall be revised to include a narrative to describe how each development phase will be filled, how surface water will be managed and how vehicle access will be provided. 6. The plan sheets and engineering report shall be revised to provide vehicle access for operation and maintenance of the new leachate management facilities, existing and future landfill gas (LFG) extraction system components and maintenance of final cover. • 7. The post-closure operation and maintenance period for the proposed development shall be modified to cover 30 years.