2008-03-21_GENERAL DOCUMENTS - C1980007 (3)

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Simulation No. 12 THE DIVISION DIRECTS MCC 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 NO. 1 UNDERGROUND MINE." THIS MONITORING NETWORK IS DESIGNED TO MONITOR THE FIRST PANEL WEST FROM THE SW MAINS INTAKES AND SOUTH OF THE NO. 1 WEST SUBMAINS, DESIGNATED AS "PANEL I W-1 S," LOCATED ADJACENT TO AND PARALLEL TO THE WESTERN BOUNDARY OF SECTION 21, RANGE 9OW, TOWNSHIP 135. THIS MONITORING NETWORK SHALL CONSIST OF SUBSTANTIAL MONUMENTS DESIGNED TO RESIST FROST HEAVE, FIRE, AND THE ACTIONS OF CATTLE AND WILDLIFE. STATUS: COMPLIED WITH; INCLUDED WITH PR-4 APPROVED 6/14/1985. Stipulation No. 13 THE SUBSIDENCE MONITORING NETWORK SHALL BE SURVEYED UTILIZING CONVENTIONAL GROUND SURVEYING TECHNIQUES, DESIGNED TO ACHIEVE HORIZONTAL ACCURACIES COMPLYING W[TH THE U.S. DEPARTMENT OF COMMERCE'S "SECOND ORDER, CLASS II" SURVEY STANDARDS, AND VERTICAL ACCURACIES NO LESS THAN +/- 1.2 FEET. THIS GRID SHALL BE SURVEYED TWICE PRIOR TO THE INITIATION OF SUBSIDENCE. IN CONJUNCTION WITH THESE SURVEYS, MCC SHALL SELECT AND ESTABLISH A MINIMUM OF SIX TRIANGULATION BENCH MARK MONUMENTS OUTSIDE THE AREA OF ANTICIPATED SUBSIDENCE EFFECTS, FOR THE PURPOSE OF CORRELATION W[TH AERIAL PHOTOGRAMMETRIC POST-SUBSIDENCE SURVEYS. STATUS: TERMINATED 12/11/1992 Stipulation No. 14 MCC HAS REQUESTED TO COMPLETE APRE-SUBSIDENCE AERIAL PHOTOGRAMMETRIC SURVEY OF THE SUBSIDENCE MONITORING GRID FOR THE PURPOSE OF CORRELATION WITH THE FIELD SURVEY RESULTS. IT IS MCC'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 W[LL 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 O.2 FEET VERTICALLY AND HORIZONTALLY, WITH SURVEY POINT LOCATION DEVIATIONS OF LESS THAN O.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 O.8 FEET. STATUS: FORGIVEN 58