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OF HYDROLOGIC IMPACTS OF MINING IN THE UPCOMING YEAR. THE REPORT SHALL <br />BE SUBMITTED IN THE ANNUAL HYDROLOGY REPORT NO LATER THAN APRIL 30 OF <br />EACH YEAR. <br />STATUS: ACTIVE <br />Stipulation No. 3 <br />THE OPERATOR SHALL, UPON CLOSURE, INSTALL WATER -TIGHT SEALS WITHIN THE <br />MINE TO PREVENT GRAVITY 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 <br />AND 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 MINE DISCHARGE. <br />STATUS: FUTURE <br />Stipulation No. 7 <br />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, <br />1985 SUBMITTAL. ONE INDICATOR SHALL BE INSTALLED WITHIN 160 FEET OF THE <br />TOE OF THE WASTE PILE CURRENTLY HALF WAY BETWEEN MONUMENTS 51 AND 54. <br />THE SECOND SHALL BE INSTALLED APPROPRIATELY 100 FEET NORTHEAST OF <br />MONUMENT S2, 160 FEET NORTH OF THE TOE OF THE WASTE PILE, AS INDICATED ON <br />DRAWING NO. MG -R C -001, INCLUDED IN THE PERMIT REVISION NO. 6 <br />APPLICATION. DURING THE INSTALLATION OF THESE TILT METER TUBES, THE <br />OPERATOR SHALL AUGER AND LOG THE SURFICIAL AND BEDROCK STRATIGRAPHY <br />ENCOUNTERED. AUGERING SHALL CONTINUE UNTIL THE OPERATOR HAS <br />ESTABLISHED INTACT BEDROCK OCCURRENCE. IF ANY EVIDENCE OF EXISTING <br />LANDSLIDE DEPOSITS IS ENCOUNTERED, THE OPERATOR SHALL DEFINE THE NATURE <br />AND EXTENT OF THE PRE - EXISTING SLOPE INSTABILITY. IF SUCH LANDSLIDE <br />ACTIVITY IS DISCERNED, THE OPERATOR WILL BE REQUIRED TO APPROPRIATELY <br />RECONFIGURE THE PILE DESIGN, PRIOR TO INITIATION OF ANY CONSTRUCTION <br />ACTIVITY. <br />STATUS: FUTURE. <br />Colowyo Mine <br />Permit No. C- 1981 -019 <br />2010 Midterm Review <br />10 May 2010 <br />