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FE8 2 3 2000 <br /> 1 <br /> February 21, 2000 <br /> Mr. Steve Rohif <br /> City of Elk River <br /> 13065 Orono Parkway <br /> Box 490 <br /> Elk River, MN 55330 <br /> RE: Elk River Landfill-CUP and License Amendments/Renewal <br /> Dear Steve: <br /> This letter is sent to transmit my suggested modifications to the conditional use permit and the <br /> license agreement for the Elk River Landfill (ERL). I have reviewed the specific language of the <br /> documents and have made my suggested modifications in ink on the respective pages. <br /> On page 4 of the license agreement the "Permit Application" is referenced. The following <br /> comments have not been resolved. I would recommend that the conditions identified as follows <br /> be added to the license. <br /> 1. Leachate Management System — No new tanks are proposed for storage of leachate <br /> • generated within the additional 44 acres (Cells 12a-17) of landfill expansion. The new <br /> landfill liner area will be entirely serviced by the existing leachate station #3. . Additional <br /> leachate management and storage facilities must be constructed, as necessary, such that <br /> the leachate head does not exceeds a maximum of 12 inches for any liner cell. <br /> 2. ERL shall continue to monitor the leachate head on a weekly basis for all cells to <br /> demonstrate compliance with the maximum head levels allowed. The results shall be <br /> submitted to the City on a quarterly basis. <br /> 3. The rationale for the landfill liner leak detection design shall be identified. The sampling and <br /> contingency action protocols for liner leaks shall be outlined in the Operations Plan for the <br /> site. <br /> 4. The quality of final cover soils and vegetation is critical to the implementation of final cover <br /> design which calls for steepened sideslopes. The topsoil specification for the final cover <br /> design and other finished grading construction identifies that topsoil comply with MNDOT <br /> 3877.2B standard specifications. The Construction Quality Assurance Program must be <br /> amended to document compliance with topsoil sampling and testing for every 1000 cubic <br /> yards. <br /> 5. The proposed basegrade plan indicates that there will be areas which will require soil fill <br /> prior to construction of the liner system. The engineering report requires that subgrade fill <br /> soils be compacted to 95% standard proctor density (ASTM D698). The Construction Quality _ <br /> • <br /> ENVIRONMENTAL RESOURCE GROUP <br /> 900 Second Avenue South Minneapolis, MN 55402 <br /> phone 612.339.4750 fax 612.339.4990 <br />