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• making the final decision regarding bio-reaction. It appears unlikely that MPCA will approve leachate recirculation. 3 to 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 1,500,000 cubic yards of disposal area on 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 following 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 secure the slopes, and a maximum of 40 feet vertical tiers. So far the Landfill has not met MPCA's criteria regarding 3 to 1 slopes. Again staff feels comfortable with MPCA making the final decision on this issue. • Screening A 200 foot buffer strip exists around the Landfill, except to the north where the Landfill extends out of the City Elk River into Livonia Township. The site map included with this memo shows the proposed finished contours 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 minimize 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 for 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. •