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4 ~ • <br />Stipulation No. 6 ~ <br />THE DIVISION DIRECTS WEST ELK COAL COMPANY, PRIOR TO ANY DISTURBANCE AT <br />THE UPPER WASTE PILE SITE, TO SUBMIT AN APPROPRIATE AMENDMENT TO THE <br />OPERATION PLAN WITHIN THE EXISTING PERMIT TO LIMIT EXTRACTION BENEATH THE <br />WASTE PILE AND WITHIN A DEFINED BUFFER ZONE 70 PRIMARY DEVELOPMEN7 ONLY. <br />THE SURFACE BUFFER ZONE WILL BE DEFINED BY THE SUBSIDENCE ANGLE OF DRAW. <br />Stipulation No. 7 ~ <br />THE DIVISION DIRECTS WEST ELK COAL COMPANY, PRIOR TO ANY DISTURBANCE AT <br />THE UPPER WASTE SITE, TO INSTALL SEVERAL ELECTRONIC TILT METER TUBES <br />DOWNSLOPE FROM THE TOE OF THE PROPOSED WASTE STRUCTURE. THESE TILT METER <br />INSTALLATIONS SHALL BE INSTALLED AS SPECIFIED IN WECC'S AUGUST 15, 1985 <br />SUBMITTAL. ONE INDICATOR SHALL BE INSTALLED WITHIN 160 FEET OF THE TOE <br />OF THE WASTE PILE CURRENTLY HALF WAY BETWEEN MONUMENTS 51 AND 54. THE <br />SECOND SHALL BE LISTED APPROPRIATELY 100 FEET NORTHEAST OF MONUMENT S2, <br />160 NORTH OF TOES OF THE WASTE PILE, AS INDICATED ON DRAWING N0. MG-R <br />C-001, INCLUDED IN THE PERMIT REVISION APPLICATION. DURING THE <br />INSTALLATION OF THESE TILT METER TUBES, THE OPERATOR SHALL AUGER AND LOG <br />THE SURFICIAL AND BEDROCK STATIGRAPHY ENCOUNTERED. AUGERING SHALL <br />CONTINUE UNTIL THE OPERATOR HAS ESTABLISHED INTACT BEDROCK OCCURRENCE. <br />IF ANY EVIDENCE OF EXISTING LANDSLIDE DEPOSITS IS ENCOUNTERED, THE <br />OPERATOR SHALL DEFINE THE NATURE AND EXTENT OF THE PRE-EXISTING SLOPE <br />INSTABILITY. IF SUCH LANDSLIDE ACTIVITY IS DISCERNED, THE OPERATOR WILL <br />BE REQUIRED TO APPROPRIATELY RECONFIGURE THE PILE DESIGN, PRIOR TO <br />INITIATION OF ANY CONSTRUCTION ACTIVITY. <br />Stipulation No. 8 <br />SURFACE WATER AND GRDUND WATER MONITORING OF 7HE LOWER PERMANENT <br />UNDERGROUND DEVELOPMENT WASTE PILE WILL INCLUDE THE CHEMICAL CONSTITUENTS <br />SELENIUM, UNIONIZED AMMONIA, AND NITRATE/NITRITE. DETERMINATION OF <br />NITRITE CONCENTRATION WILL BE MADE ONLY WHEN DEEMED NECESSARY BY THE <br />DIVISION. RESULTS AND INTERPRETATIONS ARE TO BE INCLUDED ON A CONTINUING <br />BASIS IN 7HE WEST ELK COAL COMPANY QUARTERLY HYDROLOGY REPORTS. ANNUAL <br />HYDROLOGY REPORTS ARE TO INCLUDE A SUMMARY OF SEASONAL CHANGES, IF ANY, <br />FOR ALL CHEMICAL CONSTITUENTS (SURFACE WATER AND GROUND WATER) MONITORED <br />DURING THE YEAR. ANNUAL HYDROLOGY REPORTS ARE TO INCLUDE AN ASSESSMENT <br />OF THE IMPACTS OF THE LOWER WASTE PILE TO THE HYDROLOGIC BALANCE DURING <br />THE PREVIOUS YEAR. <br />Stipulation No. 4 '~ <br />ANNUAL HYDROLOGY REPORTS ARE TO INCLUDE, PURSUANT TO RULE 2.04.7(1)(b), A <br />MAP SHOWING THE PIEZOMETRIC SURFACE OF THE COLLUVIAL AQUIFER IN THE AREA <br />OF THE LOWER PERMANENT UNDERGROUND DEVELOPMENT WASTE PILE, IF ONE <br />DEVELOPS. <br />