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-6- DEVIATION OF LESS THAN 0.2 FEET VERTICALLY AND HORIZONTALLY, WITH TRIANGULATION MONUMENT LOCATION DEVIATIONS OF LESS THAN 0.4 FEET VERTICALLY AND HORIZONTALLY FOR LESS THAN 83% OF THE TRIANGULATION MONUMENTS, AND WITH NO SINGLE TRIANGULATION POINT LOCATION DEVIATION VERTICALLY OR HORIZONTALLY IN EXCESS OF 0.8 FEET. Stipulation No. 21 IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC MONUMENT SURVEYS FAIL TO MEET THE STIPULATED ACCURACY CRITERIA, WECC SHALL UTILIZE TRADITIONAL FIELD SURVEY \ TECHNIQUES TO ESTABLISH THE REASONS FOR LACK OF CORRELATION. IF THE RESULTS CANNOT BE CORRELATED, WECC SHALL RESUME TRADITIONAL FIELD SURVEY MONUMENT MONITORING, IN COMPLIANCE WITH THE ACCURACY CRITERIA AND STANDARDS CONTAINED WITH STIPULATION N0. 14. Stipulation No 22 THE DIVISION DIRECTS WECC TO SUBMIT REPORTS OF ITS SUBSIDENCE MONITORING PROGRAM ON A SEMI-ANNUAL BASIS, COMMENCING ONE MONTH AFTER THE INSTALLATION AND INITIAL SURVEYING OF THE SUBSIDENCE MONUMENTS. FURTHER, DUE TO THE \/ 1 COMPLEXITY OF THE PERMIT AREA GEOLOGY, PRESENCE OF LANDSLIDES AND STEEP SLOPES, AND SENSITIVE HYDROLOGIC ELEMENTS, WECC IS DIRECTED TO SUBMIT A PROPOSED SUBSIDENCE MONITORING REPORT FORMAT TO THE DIVISION FOR APPROVAL. THIS REPORT FORMAT SHOULD RECOGNIZE THE IMPORTANCE OF CONTINUAL UPDATE OF SUBSIDENCE DATA INTERPRETATION, MONITORING OF GROUND WATER LEVELS AND SPRING FLOWS, MONITORING OF MINE INFLOW, AND SUBSURFACE GROUND CONDITIONS WHICH COULD BE CORRELATED TO SUBSIDENCE PREDICTION. THIS REPORT FORMAT SHALL BE APPROVED BY THE DIVISION PRIOR TO THE COMMENCEMENT OF EXTRACTION OF COAL WITHIN THE SUBSIDENCE TEST PANEL DESIGNATED IN APPENDIX A TO WECC'S NOVEMBER, 1984 PERMIT REVISION APPLICATION (PANEL 1W-1S). STIPULATION No. 23 THE DIVISION DIRECTS WECC TO COMPLETE A DETAILED ANALYSIS OF THE POTENTIAL EFFECTS OF SLOPE STABILITY UPON THE STABILITY OF THE LANDSLIDE DEPOSIT LOCATED ABOVE THE TOWN OF SOMERSET, REFERENCED ON PAGE 30 OF EXHIBIT 3.4.8.A OF THE REVISED PERMIT APPLICATION. WECC SHALL INSTALL AND MONITOR AN APPROPRIATE SET OF MONUMENTS ON THE LAND SLIDE DEPOSIT IN ORDER TO OBSERVE THE POTENTIAL \ DISPLACEMENT OF THE LANDS FORM. THE DETAILED ANALYSIS SHALL BE COMPLETED AND SUBMITTED TO THE DIVISION FOR REVIEW. NO PILLAR RECOVERY SHALL OCCUR WITHIN THE AFFECTED PANELS PRIOR TO RECEIPT OF DIVISION APPROVAL. IF SUBSIDENCE MONITORING EXPERIENCE OR THE DETAILED STABILITY ANALYSIS INDICATES THAT SECONDARY EXTRACTION WOULD ADVERSELY AFFECT THE STABILITY OF THE LANDSLIDE DEPUSIT ABOVE THE TOWN OF SOMERSET, THEN WECC SHALL LIMIT THE EXTRACTION OF THESE PANELS TO 50%. THE AFFECTED PANELS ARE THE THREE NORTHERN MOST PANELS TO THE WEST OF THE MAINS WITHIN SECTION 17.