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' Page 2 <br /> June 8, 1998 <br /> <br />o <br /> <br />The engineering report shall be modified to include procedures which will be used to protect ihe <br />barrier layer underlying the demolition debris during filling operations considering the physical <br />characteristics of the waste material. <br /> <br />9. The plan sheets and engineering report shall be modified to indicate the management of LFG <br /> condensate in a manner consistent with that of MSW leachate. <br /> <br />10. <br /> <br />The surface water management plan shall be modified to tie into existing and future surface water <br />control features for closed portions of the west slope. Surface water ponding areas within the fill <br />area shall be eliminated. The design of surface water control structures shall be modified t9 provide <br />a continuous final cover system. <br /> <br />11. <br /> <br />The proposed leachate management system shall be modified to eliminate potential problems with <br />operation and maintenance. Specifically, the ieachate sump area and force main shall be designed <br />to provide frost protection. <br /> <br />12. Final cover slopes shall be constructed with a maximum 4H: 1V grade in accordance with approved <br /> plans. All transition areas where slopes change grade shall not exceed 4H: IV. <br /> <br />13. The leachate collection and management system shall be operated to maintain a maximum head of <br /> one foot on the barrier layer for the liner. <br /> <br />14. <br /> <br />A 200 foot buffer area shall be maintained between the waste and the property line. If compliance <br />boundary wells are required beyond the property boundary, a variance from the Solid Waste <br />Management Rules will be required. <br /> <br />The May 21, 1998 technical memorandum prepared by Wenck Associates which provides <br />supplemental design information shall be incorporated into the modified plan sheets and engineering <br />report. <br /> <br />If there are any additional comments or questions regarding this matter, please contact us. <br /> <br />Bill Armstrong <br />Minnesota Pollution Control Agency <br /> <br />City of Elk River <br /> <br />CC.' <br /> <br />John Kellas, Elk River Landfill <br />Matthew Ledvina, Liesch Associates <br />Jim Simonet, EnecoTech Midwest, Inc. <br />Rod Ambrosie, Wenck Associates <br /> <br />\\granite\prjglfi32003\lt980603.doc <br /> <br /> <br />