2020-12-23_PERMIT FILE - C1981044

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and panel projections in the southeast corner of the Big Bottom area, however, MCM recognizes and acknowledges that any future development or mining of those reserves would require submittal and approval of the appropriate supplemental baseline information and permit applications. Williams Fork River Alluvial Valley Floor Areas There has been extensive historical room and pillar mining under the Williams Fork Fork River alluvial valley floor areas (refer to Section 2.05.3, Operation Plan - Permit Area, for mine plan details and Map 23), however, no full- extraction mining has occurred or is currently planned in these areas. All surface facilities associated with the No. 5 and No. 6 mines, which are located within or adjacent to the identified Williams Fork River alluvial valley floor areas, will be reclaimed, consistent with the approved reclamation plans. Some of the facilities are located over development entries (mains and sub - mains) which are designed to remain stable for the life of the mine. These areas have been protected against subsidence by assuring that sufficient coal was left in place to prevent or minimize subsidence in the area. Given the time period that has elapsed since these entries were developed, and that no discernible surface subsidence has been detected, the potential for any future subsidence is negligible. Most of these areas will be reclaimed to flood - irrigated hayfields, however, adjacent hillslopes such as the No. 5 portal face -up area, will be reclaimed and returned to rangeland/wildlife habitat. More detailed discussions of the Yampa and Williams Fork Rivers Alluvial Floors are included in the following sections: • 2.04.7 - Hydrology Information • 2.05 - Minimum Requirements for Operation and Reclamation Plan • 2.06.8 - Surface Coal Mining and Reclamation on Areas or Adjacent to Areas Including Alluvial Valley Floors Rule 4.24.4 requires specific information describing environmental monitoring programs for alluvial valley floors. The hydrologic monitoring program for the Williams Fork and Yampa River alluvial valley floor areas is presented in Exhibit 29. 4.25 OPERATIONS ON PRIME FARMLANDS As described in Section 2.04.12, Prime Farmland Investigation, MCM has researched historical land use information and evaluated data on soil resources in the Permit Area. The results of this investigation indicate that no areas, which could be classified as prime farmland, exist within the areas to be disturbed by MCM's miring and related operations. Accordingly, MCM has requested a negative determination for all areas to be disturbed within the Permit boundary as lands having value as prime farmland. Based upon this request for a negative determination, the performance standards of this section are not applicable. 4.26 MOUNTAINTOP REMOVAL MCM does not plan any surface coal mining activities; therefore, this section of the performance standards is not applicable. 4.27 OPERATIONS ON STEEP SLOPES MCM does not plan any surface coal mining activities; therefore, this section of the performance standards is not applicable. TR14 -36 4.01 -14 Revised 06/23/14