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This stipulation has been incorporated into the permit on revised page 32 of Appendix C-1. The stipulation therefore has been terminated as of October 27, 1989. New Status: Terminated. Stipulation No. 12 THE DIVISION DIRECTS WECC TO COMPLETE THE INSTALLATION OF THE SUBSIDENCE MONITORING NETWORK PRIOR TO THE INITIATION OF EXTRACTION OF COAL WITHIN THE PANEL DESIGNATED IN APPENDIX A TO THE NOVEMBER, 1984 PERMIT REVISION APPLICATION ENTITLED "APPLICATION TO REVISE THE MINING AND RECLAMATION PLAN FOR THE MT. GUNNISON N0. 1 UNDERGROUND MINE". THIS MONITORING NETWORK IS DESIGNED TO MONITOR THE FIRST PANEL WEST FROM THE SW MAINS INTAKES AND SOUTH OF THE N0. 1 WEST SUBMAINS, DESIGNATED AS "PANEL 1W-1S", LOCATED ADJACENT TO AND PARALLEL TO THE WESTERN BOUNDARY OF SECTION 21, RANGE 90W, TOWNSHIP 135. THIS MONITORING NETWORK SHALL CONSIST OF SUBSTANTIAL MONUMENTS DESIGNED TO RESIST FROST-HEAVE, FIRE, AND THE ACTIONS OF CATTLE AND WILDLIFE. Previously complied with. Stipulation No. 13 THE SUBSIDENCE MONITORING NETWORK SHALL BE SURVEYED UTILIZING CONVENTIONAL GROUND SURVEYING TECHNIQUES, DESIGNED TO ACf{IEVE HORIZONTAL ACCURACIES COMPLYING WITH THE U.S. DEPARTMENT OF COMMERCE'S "SECOND ORDER, CLASS II" SURVEY STANDARDS, AND VERTICAL ACCURACIES NO LESS THAN + 0.2 FEET. THIS GRID SHALL BE SURVEYED TWICE PRIOR TO THE INITIATION OF ~l1BSIDENCE. IN CONJUNCTION WITH THESE SURVEYS WECC SHALL SELECT AND ESTABLISH A MINIMUM OF SIX TRIANGULATION BENCH MARK MONUMENTS OUTSIDE THE AREA OF ANTICIPATED SUBSIDENCE EFFECTS, FOR THE PURPOSE OF CORRELATION WITH AERIAL PHOTOGRAMMETRIC POST-SUBSIDENCE SURVEYS. Previously complied with. Stipulation No. 14 WECC HAS REQUESTED PERMISSION TO COMPLETE A PRE-SUBSIDENCE AERIAL PHOTOGRAMMETRIC SURVEY OF THE SUBSIDENCE MONITORING GRID, FOR THE PURPOSE OF CORRELATION WITH THE FIELD SURVEY RESULTS. IT IS WECC'S INTENTION TO UTILIZE AERIAL PHOTOGRAMMETRIC METHODOLOGY TO MONITOR POST-SUBSIDENCE MOVEMENTS OF THE SUBSIDENCE MONUMENTS. THE RESULTS OF THE PRE-SUBSIDENCE FIELD AND AERIAL PHOTOGRAMMETRIC SURVEYS SHALL BE COMPARED FOR EACH GRID MONUMENT. THE AERIAL SURVEY WILL BE ACCEPTED AS ACCURATE AND WILL BE USED FOR SUBSEQUENT POST-SUBSIDENCE MONITORING, IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC AND FIELD SURVEYS CORRELATE WITH AN AVERAGE SURVEY POINT LOCATION DEVIATION OF LESS THAN 0.2 FEET VERTICALLY AND HORIZONTALLY, WITH SURVEY POINT LOCATION DEVIATIONS OF LESS THAN 0.4 FEET VERTICALLY AND HORIZONTALLY FOR LESS THAN 95% OF THE SURVEY POINTS, AND WITH NO SINGLE SURVEY POINT LOCATION DEVIATION VERTICALLY OR HORIZONTALLY IN EXCESS OF 0.8 FEET. Previously forgiven. -5-