2023-02-01_REVISION - M2015030 (5)

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Chavers Mining Resource DRMS Permit No.M-2015-030 Amendment No.2(AM-02) February 2023 Page 8 proceed with the revegetation process. The approximate 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 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 Cells 2—6 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 2 - 3 feet of final grade as indicated by ASCI survey. Should completion of Reclamation Phase 1 not be feasible within five(5) years from the date ASCI informs the DRMS that all material extraction and stockpile removal is complete, an extension will be submitted based on the remaining backfill volume required at that time. ■ Reclamation Phase 2: Grading, Topsoil, Seeding, and Growth Monitoring—In Reclamation Phase 2, ASCI will remove existing structures, grade Site contours for the±87 acres of affected area to approximately six(6)inches below the final grade, and place a final cover topsoil layer approximately six(6) inches thick across the affected area. Changes to topography will be made as necessary until the final grade is within acceptable limits and returned to pre-mining elevations. Once final grade is achieved, site seeding, fertilizing, and mulching will occur in the