2020-12-23_PERMIT FILE - C1981044

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4.20.3 SURFACE OWNER PROTECTION MCM will comply with all provisions of the subsidence control plan. In the unlikely event that subsidence causes material damage to structures, or reduces the value or reasonably foreseeable beneficial use of surface lands, MCM will restore, rehabilitate, or remove and replace damaged structures, and take appropriate steps to reestablish or provide reasonable compensation for reduced or lost value or uses of lands. 4.20.4 BUFFER ZONES Underground mining will be conducted so as not to cause material damage to any perennial stream. Underground mining will also not be conducted beneath or adjacent to any impoundment having a storage volume of 20 acre -feet or more. Underground mining will not be conducted beneath any aquifer that serves as a significant source of water supply to any public water system. Underground mining will not be conducted beneath or in close proximity to any public buildings or urbanized areas. 4.21 COAL EXPLORATION As explained in Section 2.02, General Requirements for Coal Exploration, no coal exploration activities are currently planned for areas outside the permit boundaries. Therefore, the requirements of this section are not applicable. All baseline data collected and related activities were conducted under an approved exploration permit. Any future coal exploration activities, which occur, will be conducted in accordance with applicable rules and regulations, and any necessary permits will be obtained prior to initiating exploration activities. 4.22 CONCURRENT SURFACE AND UNDERGROUND MINING As previously noted, MCM has no plans to conduct surface mining operations. Current plans call for the identified MCM coal reserves to be recovered exclusively by underground mining methods. Therefore, concurrent surface and underground mining operations will not occur on the Williams Fork Mine property, and the requirements of this section are not applicable. 4.23 AUGER MINING MCM has no current plans to supplement coal recovery through the use of auger mining methods. Evaluation of the geologic characteristics of the existing MCM coal reserves indicates that they are generally not compatible with current auger mining methods. Therefore, the requirements of this section are not applicable. 4.24 OPERATIONS IN ALLUVIAL VALLEY FLOORS As previously discussed in Section 2.06.8, Surface Coal Mining and Reclamation on Areas or Adjacent to Areas Including Alluvial Valley Floors, there are two areas of identified alluvial valley floor deposits within the MCM Permit boundaries: • Yampa River Alluvial Valley Floor Area (Big Bottom) • Williams Fork River Alluvial Valley Floor Area Yampa River Alluvial Valley Floor Area (Bid; Bottom) Development mains and sub -mains were previously driven under the Big Bottom area from the No. 9 Mine (refer to Section 2.05.3, Operation Plan - Permit Area, for mine plan details), however, sufficient pillars were left in place to provide long- term support and prevent or minimize subsidence. The only surface facilities, which have or will result in surface disturbance in the Big Bottom area, are several ground water monitoring wells. The surface disturbance associated with the ground water monitoring wells is insignificant relative to the significant areal extent of the Big Bottom area. There are known coal reserves under the Big Bottom area and future mining projections (refer to Map 24) show development of mains TR14 -36 4.01 -13 Revised 06/23/14