2025-03-14_PERMIT FILE - M2025016 (22)

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// PAGE 6 EXHIBIT L Raptor Materials, LLC Cogburn Sand, Gravel, and Reservoir Project February 2025 A Regular Impact (112) Construction Permit Application – Colorado Division of Reclamation Mining and Safety, Office of Mined Land Reclamation is expected to expand during grading and mixing, a swell factor was applied to these volumes. Likewise, a shrinkage factor was applied to the material volume for compaction. Calculation of the regrade and liner material volumes required for reclamation is presented in Table 4 below. Table 6. Regrade and Liner Volume Calculations Activity Wall Area [sq.ft] Wall Depth [ft] Keyway Length [ft] XS Keyway Area [sq.ft] Material Vol [cu.ft] Material Vol [cu.yd] Regrade 157,078 1 N/A N/A 157,078 5,818 Liner 100,301 4 4,884 16 479,347 17,754 Haul distance was calculated as an average of the of the distance of liner sources to the site: 3,919 feet from the P115 Kurtz site (M1999-006), 2,836 feet from the P122 Bearson site (M2015-003), and 415 feet from on- site sources, for an average haul distance of 2,390 feet. The source deposits contain extensive materials suitable for use in constructing the liner including shale, claystone, clay, sandstone-claystone-siltstone and sandstone-siltstone bedrock, clay lenses in the sand and gravel deposit, and overburden often comprised of low plasticity sandy silty clay to silty sand. Excess topsoil has also been successfully used as a liner construction material and could be used if excess material is available. Typical liner installation as described in Exhibit E – Reclamation Plan is shown on Figure 1 and Figure 2 below, which indicate dimensions used in the calculation of regrade area and liner and backfill volumes for this cost estimate. Figure 1. Typical Fully Reclaimed Liner and Backfill Construction for Wall Depths Shallower than 30 ft