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

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// PAGE 9 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 Revegetation Revegetation will occur following placement of topsoil on disturbed areas remaining at the time of reclamation. As described in the above subsection, Topsoil, only reclaimed slopes above the static water surface elevation in Pit P125B will be disturbed at the 5-year mark. Seeding will therefore occur over the same exposed area as described in more detail in Exhibit E – Reclamation Plan, and according to seed mixes and application methods presented in Table L, attached as an addendum to this Exhibit. The cost estimate for revegetation, which assumes a 25% initial failure rate that will require re-seeding, is based on unit costs taken from the recent DRMS-provided P124 Two Rivers (M2022-013) cost estimate and is presented in Table 8 below. This unit cost includes the cost of seed and fertilizer, their application, tilling, mulching, and nursey stock planting. Please note that seed costs are known to fluctuate seasonally and may vary noticeably from the unit cost used here. The seed mixture includes a substitute for mulch in the inclusion of a wheatgrass hybrid. The Division has historically agreed with and approved the inclusion of this hybrid as a substitute for mulch. Table 10. Revegetation Cost Estimate Pit Exposed P125B S.A. above WSEL [ac] Estimated Failure Rate Initial + Reseeding Area [sq.ft] Seed Cost/Acre Total Job Cost P125B 5.7 25% 7.1 $2,134.95 $15,212 Conveyor Decommissioning An elevated conveyor will be used on-site both to transport material from Pit P125B, across the Last Chance Ditch, into P125A, and to transport material from P125A to the existing conveyor that runs north-south along the eastern border of the Cogburn site, to an offsite plant location. The Operations team estimated the length of conveyor required based on proposed sequencing, offsite transportation delivery location, and the active pit design. The conveyor, installed in modular 40-foot sections, is portable and will be decommissioned and transported offsite for use elsewhere following removal of resources from the site. Decommissioning will involve the removal of the conveyor sections and belting, and demolition and on-site disposal of its supporting 2ft x 2ft x 6 ft concrete blocks. The conveyor itself is 3 feet wide. The cost estimate for conveyor decommissioning, summarized in Table 7 below, is based on unit costs taken from the recent DRMS-provided P124 Two Rivers (M2022-013) cost estimate. As consistent with this estimate, an 89.2% location adjustment factor is considered for the decommissioning cost. Table 11. Conveyor Decommissioning Cost Estimate Conveyor Element Section Length [ft] No. of Sections Width [ft] Total Dimension Unit Cost Total Job Cost Elevated Conveyor 125 3 3 1,125 [SF] $9.57/SF $10,766 Concrete Blocks 6 10 N/A 60 [LF] $6.94/LF $416 Total Conveyor Decommissioning Cost: $11,183 Location Adjustment Factor: 0.892 Adjusted Conveyor Decommissioning Cost: $9,975