5.4. SR 05-17-2010 - Laserfiche WebLink

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3 fa 1 slopes In Minnesota, landfill construction is typically done with 5 to 1 finished slopes (one foot of vertical fall in five feet horizontally). To increase their capacity, the landfill is proposing 3 to 1 slopes, Approval of the 3 to 1 slopes allows the Landfill to gain approximately 1,500,400 cubic yards of disposal area an the same footprint that is approved by the city's current permits. The concerns with these steeper slopes are erosion control and maintenance. MPCA will allow the Landfill to go to 3 to 1 slopes, if they meet the fallowing criteria: • Waste Management (the parent company) has to accept responsibility for long term maintenance at the landfill, not just Elk River Landfill, Inc. • An escrow account, not a letter of credit as is the current situation, has to be set up for post closure and contingency action. • Certain design criteria have to be met such as a minimum factor of safety regarding slope failure, using Geo-net to secuxe the slopes, and a maximum of 40 feet vertical tiers. So far the Landfill has not mot MPCA's criteria regarding 3 to 1 slopes. Again staff feels comfortable with MPCA making the final decision on this issue. Screettin~ A 200 foot buffer strip exists around the.Landfill, except to the north where the La,~ldfill extends out of the City Elk River into Livonia Township. The site map included with this memo shows the proposed finished contouurs of the landfill. The 200 foot buffer strip is denoted by a dashed line on the_site map. You will note that the proposed finished contours extend into the 200 foot buffer strip in several locations. This is necessary because of elevation changes. Staff is satisfied that the Landfill has done their best to n7inirnize the disruption of the buffer strip. Language dealing with the protection of the trees remaining in the buffer strip is included in the attached permits. The permits also reference a screening plan for the Landfill that was developed by Tim Edgeton, Sherburne County forester. End-use Staff is recommending that the Landfill develop an end-use plan for their facility that is required to be approved by the city. Is the Landfill to be a grassy vacant hill forever or is there some practical use fox this property in future? The proposed permits requires that the Landfill submits an end--use plan as part of their next renewal process in four years. Traffic Waste Management has greatly increased doe rate of waste delivery to the Landfill over previous owners. Access to the site is via U.S. Trunk Highway 169. This access has