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February 21, 2000 <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 and License Amendments/Renewal <br />Dear Steve:. <br /> <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 /> <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 /> <br />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 /> <br />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 /> <br />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 /> <br />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 /> <br />The proposed basegrade plan indicates that there will be areas,wl~ich 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 /> <br /> <br />