7.1. SR 02-21-2017 - Laserfiche WebLink

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Max Steininger, Inc.: Elk River Sand and Gravel Mine 6 | Page Zone Change & Conditional Use Permit Application December 2016 Stonelake‐Sandburn soil complex and Sandburn fine sandy loam. Both the Stonelake and Sandburn soils are in Hydrogeological Soil Group (HSG) A. HSG A soils have a high infiltration rate (low runoff potential), consisting mainly of deep, well drained to excessively drained sands or gravely sands. Mining activity will create steep slopes on a temporary basis. The active mine face is not vegetated and therefore is subject to erosion. The active face will slope towards the interior of the mining operation with no potential for off‐site sedimentation. Infiltration areas and temporary sedimentation basins will be used as needed to manage stormwater on the mine floor. The locations of these stormwater management features will move as mining progresses through the Site. Establishment of vegetation through seeding and mulching will be conducted as soon as reclaimed areas have reached final grade. Erosion control matting, sediment logs, and other erosion and sediment control practices will be used as needed throughout the mining operations. Erosion of finished slopes will be minimized by backfilling to a minimum slope of 3:1 and seeding and mulching in accordance with the Reclamation Plan. Crushing equipment is fitted with spray bars to mitigate the generation of dust during processing. Processing operations are located within recessed portions of the Site which further reduces fugitive dust emissions associated with the processing equipment. Washplants are not a significant source of fugitive dust emissions. Many of the stockpiles will have sufficient moisture content from the washing process to keep fugitive dust levels low during loading operations. Fugitive dust from internal haul roads will be controlled by use of dust suppressants such as calcium chloride or by watering. A water truck will be available on‐site to water as needed. Fugitive dust from exposed soils and stockpiles will be minimized by establishing permanent vegetation on perimeter berms and disturbed areas where reclamation grading has been completed. Visual impacts, noise impacts, and fugitive dust will be minimized by the construction of perimeter berms and maintenance of wooded setback areas as mining progresses through the Site. Weeds and other unsightly or noxious vegetation will be controlled as necessary to preserve the appearance of the area. The Site will be operated in a manner to minimize any land use conflicts and to comply with all applicable local, state, and federal permits, standards, and regulations. Access to the Site will be controlled through a combination of locking gate, berms, signs and fencing. 5.0 Reclamation Plan Mining will occur in four phases throughout the lifetime of the mine as illustrated on Sheet C2: Mine Plan. The floor of the mine will remain active for processing and stockpiling and will not be reclaimed until the completion of each mining operation. Perimeter areas, where mining has been complete, will be reclaimed in a progressive manner as mining advances through the Site. Excess clean soils from various construction projects will be backhauled to the Site and used to backfill areas to the final reclamation grades. Reclamation will be completed within 12 months of final extraction activity. Reclamation activities at the Site will consist of backfilling, shaping, slopping, and seeding. Final grades will range from 1% to 33%. Final reclamation grades are shown on Sheet C3: Reclamation Plan. Topsoil shall be placed on graded areas. Topsoil will come from on‐site sources and be placed in a layer that is a minimum of three inches thick in accordance wit h the City ordinance. After placement of topsoil is complete, the area will be seeded and mulched.