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-56- <br />OF TRIANGULATION BENCH MARK MONUMENT FIELD AND AERIAL <br />PHOTOGRAMMETRIC SURVEY RESULTS FOLLOWING EACH SEMI-ANNUAL SURVEY. <br />THE RESULTS OF EACH AERIAL PHOTOGRAMMETRIC SURVEY SHALL BE ACCEPTED <br />AS ACCURATE, IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC AND MOST <br />RECENT ANNUAL TRIANGULATION MONUMENT FIELD SURVEY RESULTS CORRELATE <br />WITH AN AVERAGE TRIANGULATION MONUMENT LOCATION DEVIATION OF LESS <br />THAN 0.2 FEET VERTICALLY AND HORIZONTALLY, WITH TRIANGULATION <br />MONUMENT LOCATION DEVIATIONS OF LESS THAN 0.4 FEET VERTICALLY AND <br />HORIZONTALLY FOR LESS THAN 83% OF THE TRIANGULATION MONUMENTS, AND <br />WITH NO SINGLE TRIANGULATION POINT LOCATION DEVIATION VERTICALLY OR <br />HORIZONTALLY IN EXCESS OF 0.8 FEET. <br />Stipulation No. 17: IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC <br />MONUMENT SURVEYS FAIL TO MEET THE STIPULATED ACCURACY CRITERIA, <br />WECC SHALL UTILIZE TRADITIONAL FIELD SURVEY TECHNIQUES TO ESTABLISH <br />THE REASONS FOR LACK OF CORRELATION. IF THE RESULTS CANNOT BE <br />CORRELATED, WECC SHALL RESUME TRADITIONAL FIELD SURVEY MONUMENT <br />MONITORING, IN COMPLIANCE WITH THE ACCURACY CRITERIA AND STANDARDS <br />CONTAINED WITH STIPULATION N0. 14. <br />Stipulation No 18: THE DIVISION DIRECTS WECC TO SUBMIT REPORTS OF <br />ITS SUBSIDENCE MONITORING PROGRAM ON A SEMI-ANNUAL BASIS, <br />COMMENCING ONE MONTH AFTER THE INSTALLATION AND INITIAL SURVEYING <br />OF THE SUBSIDENCE MONUMENTS. FURTHER, DUE TO THE COMPLEXITY OF THE <br />PERMIT AREA GEOLOGY, PRESENCE OF LANDSLIDES AND STEEP SLOPES, AND <br />SENSITIVE HYDROLOGIC ELEMENTS, WECC IS DIRECTED TO SUBMIT A <br />PROPOSED SUBSIDENCE MONITORING <br />REPORT FORMAT TO THE DIVISION FOR APPROVAL. THIS REPORT FORMAT <br />SHOULD RECOGNIZE THE IMPORTANCE OF CONTINUAL UPDATE OF SUBSIDENCE <br />DATA INTERPRETATION, MONITORING OF GROUND WATER LEVELS AND SPRING <br />FLOWS, MONITORING OF MINE INFLOW, AND SUBSURFACE GROUND CONDITIONS <br />WHICH COULD BE CORRELATED TO SUBSIDENCE PREDICTION. THIS REPORT <br />FORMAT SHALL BE APPROVED BY THE DIVISION PRIOR TO THE COMMENCEMENT <br />OF EXTRACTION OF COAL WITHIN THE SUBSIDENCE TEST PANEL DESIGNATED <br />IN APPENDIX A TO WECC'S NOVEMBER, 1984 PERMIT REVISION APPLICATION <br />(PANEL 1W-1S). <br />Stipulation No. 19: THE DIVISION DIRECTS WECC TO COMPLETE A <br />DETAILED ANALYSIS OF THE POTENTIAL EFFECTS OF SLOPE STABILITY UPON <br />THE STABILITY OF THE LANDSLIDE DEPOSIT LOCATED ABOVE THE TOWN OF <br />SOMERSET, REFERENCED ON PAGE 30 OF EXHIBIT 3.4.8.A OF THE REVISED <br />PERMIT APPLICATION. WECC SHALL INSTALL AND MONITOR AN APPROPRIATE <br />SET OF MONUMENTS ON THE LAND SLIDE DEPOSIT IN ORDER TO OBSERVE THE <br />POTENTIAL DISPLACEMENT OF THE LANDS FORM. THE DETAILED ANALYSIS <br />SHALL BE COMPLETED AND SUBMITTED TO THE DIVISION FOR REVIEW. NO <br />PILLAR RECOVERY SHALL OCCUR WITHIN THE AFFECTED PANELS PRIOR TO <br />RECEIPT OF DIVISION APPROVAL. IF SUBSIDENCE MONITORING EXPERIENCE <br />OR THE DETAILED STABILITY ANALYSIS INDICATES THAT SECONDARY <br />EXTRACTION WOULD ADVERSELY AFFECT THE STABILITY OF THE LANDSLIDE <br />DEPOSIT ABOVE THE TOWN OF SOMERSET, THEN WECC SHALL LIMIT THE <br />EXTRACTION OF THESE PANELS TO 50%. THE AFFECTED PANELS ARE THE <br />THREE NORTHERN MOST PANELS TO THE WEST OF THE MAINS WITHIN SECTION <br />17. <br />