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Exhibit L <br /> Page 4 <br /> Reclamation activities can be generally broken down as follows: <br /> Life-of-Mine Concurrent Reclamation <br /> Following initial development of sufficient pit void volume to support process waste stockpiling and long-term <br /> growth medium stockpiling,pit advance(commencing in Year 3)will occur such that pre-strip of growth medium in <br /> front of the advancing active mining face will be backhauled to the prior year's mine block for placement and <br /> revegetation. Accordingly,the concurrent reclamation is accomplished as a component of routine operations. <br /> Annual"mine blocks"range from approximately 80 to about 130 acres in area,with the fmal three years of mine life <br /> (i.e., Years 18 through 20)averaging about 72 acres per year. Thus,CSC has conservatively utilized 130 acres as the <br /> projected"maximum exposure"for terminal pit conditions,as all preceding mine blocks will have been reclaimed <br /> and revegetated, and in various stages of the prescribed five(5)year monitoring and maintenance period. <br /> Life-of-Mine Advance Reclamation <br /> The CSC mine plan incorporates the following"advance reclamation"activities which result in a proportionate <br /> reduction of the outstanding obligations at time of closure: <br /> • Year 7: Reclamation of the Northwest Haul Road(10.37 acres),which will include ripping/scarification, <br /> replacement of growth medium,and revegetation,all of which will be accomplished within the context of <br /> routine operations. <br /> • Year 11: Reclamation of the East Haul Road(10.7 acres),which will include ripping/scarification, <br /> replacement of growth medium,and revegetation,all of which will be accomplished within the context of <br /> routine operations. <br /> • All Years: As specified in Exhibit D:Mining Plan,routine mining operations will ensure that pit perimeter <br /> "highwalls"will be left in a 5H:1 V slope gradient condition,or less. The 5H:1 V design objective will <br /> approximate natural angle of repose for the sand material;and it is anticipated that drying conditions, etc. <br /> will further reduce the slope gradient, ensuring post-mining conditions conducive to the post-mining land <br /> use designation as"rangeland". <br /> Final Site Closure <br /> CSC has broken down these remaining obligations into the following components,and final site closure costs are <br /> addressed in Table L-1: Reclamation Cost Estimate. <br /> • Plant Area and Facilities <br /> To include the following: <br /> o Plant dismantlement and transport to the Denver metropolitan area for disposition,either as saleable <br /> used equipment.CSC has relied upon a vendor-supplied quote(lump sum),to include all <br /> equipment,material,and labor requirements necessary to accomplish full demolition.No provision <br /> for salvage value(if any)has been taken. <br /> o Demolition of concrete foundations/footers to nominal 18-inch depth below ground surface and <br /> placement/consolidation within pit void immediately adjacent to plant area. <br /> Colorado Sand Company II, LLC <br /> Kersey Mine 112(C)Reclamation Permit Application <br /> June 7,2024 <br />