2024-03-28_REVISION - M2015030 (2)

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Chavers Mining Resource DRMS Permit No.M-2015-030 Amendment No.2(AM-02) March 2024 Page 8 To ensure grading requirements are met, elevations will be checked periodically by ASCI during the reclamation process. This will continue until the final grade is achieved with backfill materials and topsoil cover. A final topography survey will be conducted by ASCI after topsoil has been placed,but before seeding occurs to ensure that the general Site topography does not exceed pre-mining elevations and is sloped for positive drainage. All surveys will be conducted by aerial drone. The allowable vertical variation will be approximately one(1) foot given that the final topography will be slightly undulating in areas to mimic the original landform. Once topography across the Site is within acceptable limits, ASCI will proceed with the revegetation process. The approximate maximum final contours of the Site are shown on Exhibit F - Reclamation Plan Map. ■ Seeding and Growth Monitoring: The topsoil layer will be seeded with a native grass seed mix to return the property to rangeland use. Growth of the grass will be monitored quarterly until established to ensure a successful transition back to rangeland use. 6.4.5 (2)(b) Land Uses in the Vicinity Reclamation to rangeland land is a positive and useful post-closure land use that is compatible with surrounding uses which include multiple sand and gravel mines, oil and gas industry sites, and other rangeland/agricultural lands. 6.4.5 (2)(c) Reclamation Performance Standards The following sections describe how this reclamation plan meets applicable requirements of Construction Materials Rule No. 3, Section 3.1 Reclamation Performance Standards. RULE 3: Section 3.1 - Reclamation Performance Standards 3.1.1 Establish Post Mining Land Use: The post-mining land use shall return the property to rangeland use. The Site is currently zoned Agricultural by the City of Fort Lupton. 3.1.2 Reclaiming Substituted Land: Not Applicable 3.1.3 Time Limited and Phased Reclamation: A phased reclamation approach will be implemented. Reclamation will occur in two (2)phases: ■ Reclamation Phase 1: Backfill—Reclamation Phase 1 will backfill excavated with on-site overburden, crusher fines, wash plant fines, and imported clean, uncontaminated material. Backfill will occur concurrently with mining whenever possible; however,backfill will continue after mining is complete. Reclamation Phase 1 will be complete when backfill of the entire Site is within approximately 1 - 2 feet of final grade as indicated by ASCI survey. Based on the current estimates, Reclamation Phase 1: Backfill is anticipated to be complete within approximately three(3) years after mining is complete; however, this is subject to change pending