2022-04-08_PERMIT FILE - C1981044 (4)

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MT8 2.05-24 02/28/22 old Highway 13, which provides access to the No. 5A/6 portals; and a portion of road at Williams Fork Strip Pit. If there is interest from the County, Old Highway 13 may be returned to Moffat County. The roads to remain after mining are shown on Map 29. Dependent on economic conditions and potential opportunities, MCM may consider alternative postmining land uses for certain portions of the Permit Area, as appropriate. As part of this consideration, MCM will also evaluate the value and utility of certain facilities, including but not limited to the Multi-Services Building, MCM acknowledges that any change in postmining land use and approval for permanent retention of facilities will require submittal and approval of a revision to the existing approved Permit. Sealing of Underground Openings and Covering of Coal Seams The next step in the reclamation plan is the sealing of all mine entrances and covering of all coal seams exposed during the mining operations. All mine openings will be sealed in accordance with approved MSHA plans and regulations. This will involve backfilling and sealing, through the use of approved seals, to close all portals and entrances to the underground areas. A typical seal plan is presented on Figure 57, Typical Portal Seal Plan. All exposed coal seams will be covered with a minimum of four feet of inert material. To date, MCM has sealed and covered the exposed coal seams for the No. 5 (1997) and No. 9 Mine Portals (1987/2008-2009). Sealing of Monitoring Wells When monitoring wells are no longer required, they will be sealed in accordance with Section 4.07. Any monitoring well that is to be mined-through will be sealed in accordance with Section 4.07 prior to mining through the well. Backfilling and Grading. The next step in the reclamation plan involves backfilling and grading of the portal areas as well as other facility areas to establish a stable configuration, reestablish effective drainage, and blend with the surrounding terrain. Areas requiring backfill are included on Table 63, Overburden Redistribution. The volumes included in this Table were developed by comparing the existing topography with the topography to be achieved through reclamation. Disturbed areas will be rough graded to the approximate contours shown on the Reclamation Plan Map (Map 29). Post- disturbance cross- sections for the various disturbed areas are presented in Exhibit 20, Post-Disturbance Cross-Sections. To date, MCM has backfilled and graded the following mine disturbance areas; No. 9 Mine Portal area and Refuse Disposal Area – 1987/2008-2009; No. 5 Mine Portal area – 1997-1998; Old Mine Office, Women’s/Visitor’s/Men’s Bathhouse, Lab Trailer and Sample Shed, Brazell-Simms Building, No. 9 Mine Warehouse, and Reclamation Storage Building, - 2008- 2009. Redistribution of Soil Materials The next step in the reclamation plan will be the redistribution of soil or plant growth media. In any areas where there is evidence (soil staining) or reasonable potential for petroleum contamination (shop, equipment parking, and petroleum storage), soil samples will be collected and tested for the presence of petroleum residues. If petroleum residues are detected for a sample(s), excavation and testing of soils in the corresponding area will occur, and any petroleum contaminated soils will be removed and hauled off-site for land-farming or disposal by a qualified contractor. The soil materials or best available plant growth media, will be redistributed by scrapers or small end-dump trucks and spread with dozers or graders. The rough-graded backfill surface will reduce the potential for slippage and promote rooting and moisture infiltration, and equipment operations will be conducted to minimize or mitigate compaction. Many of the disturbed areas associated with the Williams Fork operations were previously disturbed by past mining and related activities. These operations occurred prior to implementation of current reclamation regulations. As such, no topsoil was salvaged from many of these areas. MCM’s predecessor companies, in cooperation with the CMLRD completed sampling programs for some of these areas to identify the best available plant growth media. Results of the