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Bureau of Land Management Environmental Assessment Royal Gorge Field Office DOI-BLM-CO-F020-2020-0036 EA Table 1:Description of equipment types and uses duringproposed mining and processing activities. Equipment Type Use 2015 Screen Machine 4043T Processing 2018 Terex Canica 200 Vertical Shaft Impactor Processing Twin Eljay 6x20 Triple Deck Screen Processing 5-60'Field Conveyors and 1 Radial Stacker Processing 2010 Cummins 600KW Genset Processing/Power 2-2019 Volvo L180H Wheel Loaders Mining Interim Management Plan For extended non-operational periods, the operator would follow specific guidelines proposed in the mine plan and other contract and permit stipulations. The operator would either remove or secure all mobile and non-mobile equipment. All fuel, oil, lubricants, and chemical materials would be removed from the site. The entrance gate would remain locked and the fence secured prior to closure. Though there would be no guard or personnel onsite, the operator would monitor the site by means of routine inspections to ensure the site conditions, stockpiles, structures, etc. remain in compliance with the plan on file. Stormwater and Drainage Management The amended acreage and increased mine life are not predicted to necessitate major changes to the overall stormwater management plan strategy. Similar stormwater controls would be installed to replicate what is currently implemented at the active mine site. BLM would require an updated Stormwater Management Plan(SWMP) and Stormwater Permit from the State of Colorado prior to the issuance of any mineral materials contract. Stormwater drainage controls would be installed simultaneously to site preparation. These controls would divert surface flow and sedimentation from the proposed mining and staging areas. Drainage controls would consist of earthen berms along the highwall,benches and roads, drainage ditches and culverts, sediment/catchment ponds, straw wattles, and silt fences. All earthen stormwater structures (e.g.,berms and ditches)would remain throughout the duration of the mine and would be topsoiled and revegetated for stability. Berm dimensions would be approximately 2 to 3 feet high with 2:1 slopes and ditches between 1 to 2 feet deep. The sediment ponds would be monitored and maintained to handle stormwater flows that may enter either from the quarry floor or surrounding natural ephemeral pathways. The pond height may be raised, if needed, to control increased sediment loads. The current discharge point from the existing quarry is adjacent to the access road near the sediment pond. The same onsite and offsite discharge points would be used for the proposed quarry expansion. 10