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RIDER TO MINING PERMIT <br /> Permit Date: July 31,2021 <br /> Permit No: C-1980-007 <br /> The following additional stipulations form an integral part of the foregoing permit: <br /> Stipulation No. 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 /> ACCELEROMETER/SEISMOMETER MONITORING IN AND AROUND MONUMENT DAM. <br /> Page 8 of 9 <br />