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Page 2 <br /> June 8, 1998 <br /> • 8. The engineering report shall be modified to include procedures which will be used to protect the <br /> barrier layer underlying the demolition debris during filling operations considering the physical <br /> characteristics of the waste material. <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 /> 10. 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 to provide <br /> a continuous final cover system. <br /> 11. The proposed leachate management system shall be modified to eliminate potential problems with <br /> operation and maintenance. Specifically, the leachate sump area and force main shall be designed <br /> to provide frost protection. <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:1V. <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 /> • 14. 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 /> 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 /> If there are any additional comments or questions regarding this matter, please contact us. <br /> Sincerely, <br /> cf27:1)2e()AO" 4 .1 4 <br /> Bill Armstrong ' Dave Lucas <br /> Minnesota Pollution Control Agency Sherbu me"County <br /> x?erve <br /> Steve Rohlf 0 <br /> City of Elk River <br /> cc: John Kellas, Elk River Landfill <br /> Matthew Ledvina, Liesch Associates <br /> . Jim Simonet, EnecoTech Midwest, Inc. <br /> Rod Ambrosie, Wenck Associates \\granite\prj$\Ifl32003\It980603.doc <br />