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Stipulation No. 15 WECC HAS REQUESTED PERMISSION TO COMPLETE AERIAL PHOTDGRAMMETRIC SURVEYS OF THE SUBSIDENCE MONITORING GRID SUBSEQUENT TD 7HE INITIATION OF SUBSIDENCE, FOR THE PURPOSE OF MONITORING SUBSIDENCE MONUMENT MOVEMENTS. THE ACCURACY OF THE AERIAL PHOTOGRAMMETRIC SURVEYS SHALL BE DETERMINED BY A COMPARISON OF TRIANGULATION BENCH MARK MONUMENT FIELD AND AERIAL PHOTOGRAMMETRIC SURVEY RESULTS FOLLOWING EACH SEMI-ANNUAL SURVEY. THE RESULTS OF EACH AERIAL PHOTOGRAMMETRIC SURVEY SHALL BE ACCEPTED AS ACCURATE, IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC AND MOST RECENT ANNUAL TRIANGULATION MONUMENT FIELD SURVEY RESULTS CORRELATE WITH AN AVERAGE TRIANGULATION MONUMENT LOCATION 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. Previously forgiven. Stipulation No. 16 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. 15, Aerial photogrammetric surveys will not be performed. Thus, the stipulation status will be changed to "forgiven". New Status: Forgiven. Stipulation No 17 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 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 QF 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). This stipulation has been incorporated into the permit application on revised page 3-78A. The stipulation is tettninated as of October 27, 1989. New Status: Terminated. -6-