2019-10-08_PERMIT FILE - M2019054 (48)

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Exhibit L Skull Creek Sand Project Introduction There are five major steps in the reclamation cost calculation process: • Determine the point of maximum reclamation cost liability. • Estimate direct reclamation costs such as earthmoving, revegetation, and the removal and demolition of structures not to be retained as part of the postmining land use. • Adjust direct costs for inflation. • Estimate indirect reclamation costs. • Calculate the total reclamation cost amount. Determining the point of maximum reclamation liability is the most important step in the cost- estimating procedure, and will differ for each operation depending on the nature and complexity of the operation. Generally,the greatest reclamation cost liability occurs at the point in the permit term at which one or more of the following conditions exist: • The greatest area of disturbance or the greatest area requiring final grading,topsoil placement, and revegetation. • The largest volume of material to be backfilled and graded to establish suitable postmining contours. For multiple-strata mining operations,this is the point at which sand extraction from the lowest strata is complete, most of the overburden removed to that point has been placed in excess spoil fills, and little or no backfilling has occurred. • The longest haul distance between spoil or topsoil storage areas and the final placement location. • The greatest number of on-site structures. • The point at which refuse piles require the largest amount of cover material. • Maximum disturbance of areas with special reclamation needs or special materials handling plans, such as sites with prime farmland soils, acidic or toxic materials, difficult topographic situations, or underground mine workings that must be sealed. This estimate includes liability calculations for: • All areas of surface disturbance requiring Phase 2 and Phase 3 reclamation • All excavated pits requiring Phase 1 through Phase 3 reclamation This estimate includes the following details/sheets based on the reclamation schedule depicted in Map E-2 and described in Exhibit E: • Point of Maximum Reclamation Liability Determination Sheet • Reclamation Polygon Cost Estimates • Production Model Cost Data and Assumptions • Pit Backfill -Truck/Shovel, Fleet Production and Cost Analysis (FPC) • Topsoil -Truck/Shovel, Fleet Production and Cost Analysis (FPC) 1 10/3/2019