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~' ~. • • Rider to Mining Permit West Elk Mine (C-60-007) Page 2 of 3 THE PRE-EXISTING SLOPE INSTABILITY. IF SUCH LANDSLIDE ACTIVITY IS DISCERNED, THE OPERATOR WILL BE REQUIRED TO APPROPRIATELY RECONFIGURE THE PILE DESIGN, PRIOR TO INITIATION OF ANY CONSTRUCTION ACTIVITY. 18. THE DIVISION DIRECTS MCC TO COMPLETE A DETAILED ANALYSIS OF THE POTENTIAL EFFECTS UPON THE SLOPE STABILITY OF TIIE LANDSLIDE DEPOSITS ADJOINING BEAVER RESERVOIR. MCC SHALL INSTALL AND MONITOR AN APPROPRIATE SET OF MONUMENTS ON THE LANDSLIDE DEPOSITS IN ORDER TO OBSERVE THE POTENTIAL DISPLACEMENT' OF THE LAND FORK. THE DETAILED ANALYSIS SHALL BE COMPLETED AND SUBMITTED TO THE DIVISION FOR REVIEW, PRIOR TO REQUEST FOR APPROVAL TO EXTRACT COAL BENEATH THE LANDSLIDE DEPOSITS ADJOINING BEAVER RESERVOIR. 19. THE DIVISION DIRECTS MCC, AS A PORTION OF ITS SUBSEQUENT PERMIT APPLICATIONS FOR THE MINE, TO SUBMIT REVISED SUBSIDENCE EVALUATIONS. THE SUBSIDENCE EVALUATION FOR EACH PERMIT RECORD REQUESTED SHALL INCORPORATE THE RESULTS OF SUBSIDENCE MONITORING AND THE LANDSLIDE STABILITY STUDIES COMPLETED TO DATE, AS STIPULATED ABOVE. PARTICULAR ATTENTION SHALL BE FOCUSED UPON DESIGNATED SAFE AREA BUFFERS, TO BE OBSERVED [N FUTURES MINING BENEATH CRITICAL AREAS, INCLUDING THE DRY FORK OF MINNESOTA CREEK, AND BEAVER RESERVOIR AND THE LANDSLIDE DEPOSITS ADJOINING IT. THE AMENDED SUBSIDENCE EVALUATIONS SHALL INCLUDE THE PROPOSAL OF APPROPRIATE SUBSIDENCE MONITORING NETWORKS WITHIN EACH OF THESE DESIGNATED AREAS. 57. WITH SUBMITTAL OF PR-06, MCC HAS REMOVED ALL PERMIT DOCUMENT REFERENCES TO MINING BENEATH DRY FORK OF MINNESOTA CREEK INTERMOUNTAIN DI V ERSION AND RESERVOIR SYSTEM, INCLUDING REFERENCES TO BUFFER AREAS AND ASSOCIATED SUBSIDENCE CONTROL PLANS. PREVIOUSLY APPROVED SUBSIDENCE CONTROL PLAN DOCUMENTS ARE MAINTAINED IN THE DIVISION'S FILES. THE DIVISION HAS NOT, AND WILL NOT, APPROVE ANY MINING WHICH WILL POTENTIALLY AFFECT EH DRY FORK OF MINNESOTA CREEK INTERMOUNTAIN DIVERSION AND RESERVOIR SYSTEM, INCLUDING ALL PREVIOUSLY DESIGNATED BUFFER AREAS, UNTIL AND APPROPRIATE SUBSIDENCE CONTROI. PLAN IS SUBMITTED AND APPROVED.