2024-06-25_PERMIT FILE - M2024032 (2)

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EXHIBIT L Reclamation Costs In order to calculate maximum potential reclamation liability to the State, we have selected a point in time where reclamation costs could be at a maximum. It is assumed that the time of maximum mining disturbance will be midway through the mining operation. During this scenario, no reclamation will have been performed on the active mining face, pit side slopes on both sides of the mining face, and a portion of the exposed pit bottom. Additionally, an excavated area of pit will contain processing facilities including the asphalt plant and recycling operations. Stockpiles with available topsoil/overburden for backfilling will be near the pit and processing areas for reclamation, so haul distances will generally be less than 1,000 feet. Each aspect is listed in the following table with associated disturbed area. Please refer to Exhibit D, Pre-Mining/Mining Plan, for a listing of disturbed areas that total 27.6 acres. This estimate will follow the same order as the listing in Exhibit D. Connell Resources Inc. is an earth moving and construction contractor and unit costs for reclamation activities were provided from bidding documents associated with similar projects. Since all structures used in the mining operation are portable and have value, it is assumed that removal of the structures do not have associated costs. The active mining area will include the active mining face, un-reclaimed pit side slopes, un- reclaimed pit floor, and partially reclaimed pit side slopes and pit floor. The active mining face will be near vertical with a maximum length of 500 feet and an average height of 15 feet. In front of the active mining face, an area 100 feet wide will have been pre-stripped in anticipation of mining. In addition, a maximum 500 feet of un-reclaimed pit side slopes may be adjacent to each end of the active mine face. These side slopes will also be near vertical with an average height of 15 feet. Framed by the active mining face and pit side slopes, the pit floor will be un-reclaimed, contain overburden, raw material, and product stockpiles. Following backfill, the areas are rough graded in preparation for topsoil/overburden growth medium placement, final grading, and seeding for revegetation. In addition to the active mining area, the material processing area (including the asphalt plant and asphalt/concrete recycling activities) will be located within a previously mined area of the pit and require final reclamation. Approximately 2,300 linear feet of side slopes with an average depth of 10 feet that surrounds this area will have been backfilled to 3H:1 V with overburden and rough graded. The bottom of the pit area will be tilled to loosen compacted material. Final reclamation for the side slopes and pit bottom area will include topsoil/overburden growth medium placement, final grading, and seeding for revegetation. Parts of the active mine area will also be partially reclaimed and require final reclamation. It is estimated that a maximum of 1,000 feet of pit side slopes backfilled to 3H:1V, and an area of pit floor backfilled with a layer of topsoil/overburden growth medium, will likely require final reclamation. Since backfilling and grading may occur several seasons before final reclamation, the areas will be rough graded prior to additional reclamation activities. Final reclamation for these areas will include topsoil/overburden growth medium placement, final grading, and seeding for revegetation. 5J Pit DRMS 112 Permit Application Page 24