1. ELK RIVER LANDFILL - Laserfiche WebLink

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The expanded Landfill will be constructed in a series of phased construction projects. The timing `~ of the phases will be dictated by incoming waste volumes and site operations. The following Table 1 indicates that anticipated expanded Landfill construction schedule based on current and anticipated waste volumes. Table 1. Expanded Landfill Construction Phasing Cell Number Approximate Year of Construction Approximate Acres Constructed 18 2011/2012 7.86 19 2014 8.11 20 2017 15.73 1.2.4 GRADING AND DRAINAGE PLAN ERL has made it its priority to handle and control on-site all stormwater generated on the landfill. The grading and drainage plans are provided on the Drainage Plan (Sheet 4). The drainage calculations are presented in Attachment 1. During the initial construction phases of the expanded Landfill, stormwater generated will be piped to an interim pond located south of the active cells. As construction and mining conditions dictate, permanent sedimentation basins will be constructed and put into service for treatment of runoff from the expanded Landfill. The sedimentation ponds will control and minimize the amount of sediment-laden runoff that leaves the expanded Landfill. If the designated area for the permanent ponds is not available, then an equivalent sized temporary pond will be constructed in the mined area. Perimeter ditches of equivalent capacity to those shown on the final closure plans will route stormwater to the temporary ponds. The surface water runoff from the final covered landfill surface will be routed by drainage terraces that are graded into the waste structure that direct surface water to gabion-lined downslope structures. From the downslope structures, the water is subsequently routed by perimeter ditching to two sedimentation basins located on the south west (P-1) and southeast (P- 2) corners of the expanded landfill. P-1 will accept runoff from the western half of the expansion and P-2 will accept runoff from the eastern half of the expansion. P-2 will discharge via a pipe to P-1. The drainage routing features have all been sized to minimize the erosion from the site. In addition to permanent control structures, the site also utilizes temporary erosion control features, such as silt fencing, biologs, and erosion control matting to minimize erosion from the site. Portions of the final closure area are covered with erosion control matting upon closure to minimize erosion from the newly graded surfaces. stormwater generated from the site will be discharged from P-1 via a storm sewer system, under the exterior roadway to the north end of the expanded Landfill, then west under the City Trail into a wetland upstream of the Rice Lake wetland complex. The discharge point will be onto property owned by the ERL. Discharge from P-1 to the wetland west of the site has been designed to minimize impacts by limiting bounce in the wetland, restricting flow rates, and treating stormwater prior to discharge in accordance with applicable permits. Elk River Landfill SDA W ---, Section 1-4 Land Use Application ` WP_nCl<