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-62- <br />AVERAGE TRIANGULATION MONUMENT LOCATION DEVIATION OF LESS THAN 0.2 FEET <br />VERTICALLY AND HORIZONTALLY, WITH TRIANGULATION MONUMENT LOCATION <br />DEVIATIONS OF LESS THAN 0.4 FEET VERTICALLY AND HORIZONTALLY FOR LESS <br />THAN 83% OF THE TRIANGULATION MONUMENTS, AND WITH NO SINGLE <br />TRIANGULATION POINT LOCATION DEVIATION VERTICALLY OR HORIZONTALLY IN <br />EXCESS OF 0.8 FEET. <br />Stipulation No, 19 <br />IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC MONUMENT SURVEYS FAIL TO <br />MEET THE STIPULATED ACCURACY CRITERIA, WECC SHALL UTILIZE TRADITIONAL <br />FIELD SURVEY TECHNIQUES TO ESTABLISH THE REASONS FOR LACK OF <br />CORRELATIONS IF THE RESULTS CANNOT BE CORRELATED, WECC SHALL RESUME <br />TRADITIONAL FIELD SURVEY MONUMENT MONITORING, IN COMPLIANCE WITH THE <br />ACCURACY CRITERIA AND STANDARDS CONTAINED WITH STIPULATION N0. 18. <br />Stipulation No 20 <br />THE DIVISION DIRECTS WECC TO SUBMIT REPORTS OF ITS SUBSIDENCE <br />MONITORING PROGRAM ON A SEMI-ANNUAL BASIS, COMMENCING. ONE MONTH AFTER <br />THE INSTALLATION AND INITIAL SURVEYING OF THE SUBSIDENCE MONUMENTS. <br />FURTHER, DUE TO THE COMPLEXITY OF THE PERMIT AREA, GEOLOGY, PRESENCE OF <br />LANDSLIDES AND STEEP SLOPES, AND SENSITIVE HYDROLOGIC ELEMENTS, WECC IS <br />DIRECTED TO SUBMIT A PROPOSED SUBSIDENCE MONITORING REPORT FORMAT TO <br />THE DIVISION FOR APPROVAL. THIS REPORT FORMAT SHOULD RECOGNIZE THE <br />IMPORTANCE OF CONTINUAL UPDATE OF SUBSIDENCE DATA INTERPRETATION, <br />MONITORING OF GROUND WATER LEVELS AND SPRING FLOWS, MONITORING OF MINE <br />INFLOW, AND SUBSURFACE GROUND CONDITIONS WHICH COULD BE CORRELATED TO <br />SUBSIDENCE PREDICTION. THIS REPORT FORMAT SHALL BE APPROVED BY THE <br />DIVISION PRIOR TO THE COMMENCEMENT OF EXTRACTION OF COAL WITHIN THE <br />SUBSIDENCE TEST PANEL DESIGNATED IN APPENDIX A TO WECC'S NOVEMBER, 1984 <br />PERMIT REVISION APPLICATION (PANEL 1W-1S). <br />Stipulation No. 21 <br />THE DIVISION DIRECTS WECC TO COMPLETE A DETAILED ANALYSIS OF THE <br />POTENTIAL EFFECTS OF SLOPE STABILITY UPON THE STABILITY OF THE <br />LANDSLIDE DEPOSIT LOCATED ABOVE THE TOWN OF SOMERSET, REFERENCED ON <br />PAGE 30 OF EXHIBIT 3.4.8.A OF THE REVISED PERMIT APPLICATION. WECC <br />SHALL INSTALL AND MONITOR AN APPROPRIATE SET OF MONUMENTS ON THE LAND <br />SLIDE DEPOSIT IN ORDER TO OBSERVE THE POTENTIAL DISPLACEMENT OF THE <br />LANDS FORM. THE DETAILED ANALYSIS SHALL BE COMPLETED AND SUBMITTED TO <br />THE DIVISION FOR REVIEW. NO PILLAR RECOVERY SHALL OCCUR WITHIN THE <br />AFFECTED PANELS PRIOR TO RECEIPT OF DIVISION APPROVAL. IF SUBSIDENCE <br />MONITORING EXPERIENCE OR THE DETAILED STABILITY ANALYSIS INDICATES THAT <br />SECONDARY EXTRACTION WOULD ADVERSELY AFFECT THE STABILITY OF THE <br />LANDSLIDE DEPOSIT ABOVE THE TOWN OF SOMERSET, THEN WECC SHALL LIMIT <br />THE EXTRACTION OF THESE PANELS TO 50%. THE AFFECTED PANELS ARE THE <br />THREE NORTHERN MOST PANELS TO THE WEST OF THE MAINS WITHIN SECTION 17. <br />