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4.20.4 BUFFER ZONES Underground mining will not be conducted so as to cause material damage to any perennial stream. Underground mining will 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 azeas. 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 beginning exploration activities. 4 22 CONCLIRRFNT SURFACE AND UNDERGROt1ND MIlVIt IG As previously noted, CEC has no plans to conduct surface mining operations. Current plans call for the CEC coal reserve to be recovered exclusively by undergound mining methods. Therefore, concurrent surface and underground • mining operations will not occur on the CEC property, and the requirements of this section are not applicable. 4 23 AUGER MINING CEC has no current plans to supplement coal recovery through the use of auger mining methods. Evaluation of the geologic characteristics of the CEC coal reserve presently precludes the effective use of auger mining methods. Therefore, the requirements of this section are not applicable. 4.24 OPERATIONS IN ALLLMAL. 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 (2) alluvial valley floor deposits within the CEC permit boundaries. These are: • Yampa River Alluvial Valley Floor (Big Bottom) • Williams Fork River Alluvial Valley Floor Yamna River Alluvial Valley Floor (fig Bottoml There will be no full extraction mining during the first five (5) years of the proposed mine plan sequence under the Big Bottom area. Please refer to Section 2.05.3, Operation Plan -Permit Area, for mine plan details. The only surface facilities, which will cause disturbance in the Big Bottom area will be associated with the ground water monitoring wells. The surface disturbance associated with the ground water monitoring wells will be insignificant relative to the large aerial extent of the Big Bottom area. Williams Fork River Alluvial Valley Floor There will be no full extraction mining during the first five-(5) years of the proposed mine under the Williams Fork Permit Renewal No. 3 4.01-13 7/15/98