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October 18, 2001 <br /> <br />Mr. Steve Rohlf <br />City of Elk River <br />13065 Orono Parkway <br />Box 490 <br />Elk River, MN 55330 <br /> <br />RE: Elk River Landfill-CUP Amendment <br /> <br />Dear Steve: <br /> <br />This letter is sent to transmit my comments regarding the Conditional Use Permit (CUP) <br />amendments which have been requested by Elk River Landfill (ERL) and Waste Management, <br />Inc. (WMI) in their application of September 21, 2001 and supplemental information dated <br />October 16, 2001. As you have requested, I have also reviewed the conditions of the CUP to <br />determine if any other changes are appropriate from a technical perspective. <br /> <br />The major revision to the site development plan is the establishment of demolition waste <br />disposal cell, DC-3, over previously closed mixed municipal solid waste cells 2 and 9, as well as <br />a portion of cells 3. This development will have several beneficial aspects for the site. There <br />has been significant settlement in this area of the site and surface water drainage has been <br />adversely effected. Refilling this area will correct the settlement and will eliminate the need to <br />transition the waste sideslopes in this area from existing 5:1 to future 3:1 for completion of <br />subsequent waste cells in the southern portion of the site. <br /> <br />"surface Water - The existing final cover system for Cells 2,3 and 9 contains water piping within <br />the drainage layer along the existing benches. It will be necessary to locate this piping and <br />abandon or remove it to prevent the flow of leachate through the piping and potentially beyond <br />the cell DC-3 boundaries. <br /> <br /> The surface water runoff.-pond, P-l, located immediately west of the proposed DC-3 cell has <br /> been [econfigured and decreased in capacity to accommodate the construction and grading for <br /> the leachate containment system. The surface water routing for the final contour plan has been <br /> modified to correspondingly direct a large volume of surface water to the ponds located on the <br /> east and south sides of the fill area. A 24-inch culvert serves as an overflow outlet for Pond P- <br /> l. The construction plans should be developed to show the placement of rip-rap and other <br /> erosion control measures at the inlet and outlet of the 24-inch culvert. <br /> Leachate Management - The engineering design considerations for the construction of the <br /> new demolition cell are presented as a concept plan. Construction plans will need to be <br /> developed to account for detailed site conditions related to the replacement of the 10,000 gallon <br /> with a 30,000 gallon tank as noted on the engineering plan. The details for installation of the <br /> <br />ENVIRONMENTAL. RESOURCE GROUP <br />900 Second Avenue South Minneapolis, WIN 5;5402 <br /> phone 612.339.4750 fax 612.339.4990 <br /> <br /> <br />