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RIDER TO MINING PERMIT <br />Permit Date: July 31, 2016 <br />Permit No: C-1980-007 <br />The following additional stipulations form an integral part of the foregoing permit: <br />Stipulation No. <br />Description <br />3 - THE OPERATOR SHALL, UPON CLOSURE, INSTALL WATER -TIGHT SEALS WITHIN THE <br />MINE TO PREVENT GRAVITIY DISCHARGE. THIS REQUIREMENT MAY BE WAIVED UPON <br />THE DIVISION"S APPROVAL OF A PLAN SUBMITTED BY THE OPERATOR. THIS PLAN <br />SHALL INCLUDE A DEMONSTRATION THAT THE WATER QUALITY OF THE DISCHARGE <br />FROM THE MINE WORKINGS WILL BE OF ACCEPTABLE QUALITY AND WILL REMAIN <br />ACCEPTABLE AFTER MINE CLOSURE. THIS SHALL INCLUDE CHEMICAL ANALYSIS AND <br />A PREDICTIVE MODEL THAT USES OXIDATION AND REDUCTION POTENTIAL TO <br />DETERMINE LONG-TERM WATER QUALITY OF MINE WATERS. ALSO, THE PLAN SHALL <br />INCLUDE THE CONSTRUCTION OF A SUITABLE CHANNEL FOR THE MINE DISCHARGE. <br />7 - THE DIVISION DIRECTS MOUNTAIN COAL COMPANY, PRIOR TO ANY DISTURBANCE <br />AT THE UPPER WASTE SITE, TO INSTALL SEVERAL ELECTRONIC TILT METER TUBES <br />DOWNSLOPE FROM THE TOE OF THE PROPOSED WASTE STRUCTURE. THESE TILT <br />METER INSTALLATIONS SHALL BE INSTALLED AS SPECIFIED IN MCC"S AUGUST 15, 1995 <br />SUBMITTAL. ONE INDICATOR SHALL BE INSTALLED WITHIN 160 FEET OF THE TOE OF <br />THE WASTE PILE CURRENTLY HALF WAY BETWEEN MONUMENTS 51 AND 54. THE <br />SECOND SHALL BE INSTALLED APPROXIMATELY 100 FEET NORTHEAST OF MONUMENT <br />S2, 160 FEET NORTH OF TOE OF THE WASTE PILE, AS INDICATED ON DRAWING NO. MG-R <br />C-001, INCLUDED IN THE PERMIT REVISION NO. 6 APPLICATION. DURING THE <br />INSTALLATION OF THESE TILT METER TUBES, THE OPERATOR SHALL AUGER AND LOG <br />THE SUPERFICIAL AND BEDROCK STRATIGRAPHY ENCOUNTERED. AUGERING SHALL <br />CONTINUE UNTIL THE OPERATOR HAS ESTABLISHED INTACT BEDROCK OCCURENCE. IF <br />ANY EVIDENCE OF EXISTING LANDSLIDE DEPOSITS IS ENCOUNTERED, THE OPERATOR <br />SHALL DEFINE THE NATURE AND EXTENT OF THE PRE-EXISTING SLOPE INSTABILITY. IF <br />SUCH LANDSLIDE ACTIVITY IS DISCERNED, THE OPERATOR WILL BE REQUIRED TO <br />APPROPRIATELY RECONFIGURE THE PILE DESIGN, PROIR TO INITIATION OF ANY <br />CONSTRUCTION ACTIVITY. <br />76 - MOUTIAN COAL COMPANY WILL INFORM THE MONTROSE OFFICE OF THE <br />COLORADO DIVISION OF WATER RESOURCES PLACEMENT OF ALL NEW SURVEY <br />MONUMENTS. MOUNTAIN COAL COMPANY WILL COPY THE MONTROSE OFFICE OF THE <br />COLORADO DIVISION OF WATER RESOURCES ON ALL SURVEY, PIEZOMETER, AND <br />Page 8 of 8 <br />