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-6- <br />THE PRE-SUBSIDENCE FIELD AND AERIAL PHOTOGRANIINE'PRIC SURVEYS SHALL BE <br />COMPARED FOR EACH GRID MONUMENP. THE AERIAL SURVEY WILL BE ACCEPTED AS <br />ACCURATE AND WILL BE USED FOR SUBSEQUENT POST-SUBSIDENCE MONITORING, IN <br />THE EVENT THAT THE AERIAL PHOTOGRADR~IETRIC AND FIELD SURVEYS CORRELATE <br />WITH AN AVERAGE SURVEY POINT I,CX'ATION DEVIATION OF LESS THAN 0.2 FEET <br />VERTICALLY AND HORIZONTALLY, WITH SURVEY POINT LOCATION DEVIATIONS OF <br />LESS THAN 0.4 FEET VERTICACS,Y AND HORIZONTALLY FOR LESS THAN 95$ OF THE <br />SURVEY POINTS, AND WITH NO SINGLE SURVEY POINT LOCATION DEVIATION <br />VERTICALLY OR HORIZONTALLY IN EXCESS OF 0.8 FEET. <br />Stipulation No. 21 <br />~''~~ WECC HAS REQUESTED PERMISSION TO COMPLETE AERIAL PHO'LOGRANMEPRIC <br />SURVEYS OF THE SUBSIDENCE MONITORING GRID SUBSEQUENT TO THE INITIATION <br />OF SUBSIDENCE, FOR THE PURPOSE OF MONITORING SUBSIDENCE MONUMENT <br />MWII4ENT5. THE ACCURACY OF THE AERIAL PHOTOGRMMtETRIC SURVEYS SHALL BE <br />DETERMINED BY A COMPARISON OF TRIANGULATION BENCH MARK MONUMENT FIELD <br />AND AERIAL PHOTOG1iAl~M~TRIC SURVEY RESULTS FOLLAWING EACH SEMI-ANNUAL <br />SURVEY. THE RESULTS OF EACH AERIAL PHOTOGRANMETRIC SURVEY SHALL BE <br />ACCEPTED AS ACCURATE, IN THE EVENT THAT THE AERIAL PHOTOGRArM'1F,TRIC AND <br />MOST RECENT ANNUAL TRIANGULATION MONUMENT FIELD SURVEY RESULTS <br />CORRELATE WITH AN AVERAGE TRIANGULATION MONUMENT LOCATION DEVIATION OF <br />LESS 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 838 OF THE TRIANGULATION MON[R"IQ1TS, AND WITH <br />NO SINGLE TRIANGULATION POINT LOCATION DEVIATION VERTICALLY OR <br />HORIZONTALLY IN EXCESS OF 0.8 FEET. <br />/, J,~/ <br />~ (Stipulation No. 22 <br />~ ~ <br />IN THE EVENT THAT THE AERIAL PHOTOGRAM~7ETRIC MONUMENT SURVEYS FAIL TO <br />MEET THE STIPUTATED ACCURACY CRITERIA, WECC SHALL UTILIZE TRADITIONAL <br />FIELD SURVEY TECHNIQUES TO ESTABLISH THE REASONS FOR LACK OF <br />CORRELATION. IF THE RESULTS CANNGT BE OORRELATED, WECC SHALL RESUME <br />TRADITIONAL FIELD SURVEY MONUNIQ]T MONITORING, IN CO~LLANCE WITH THE <br />ACCURACY CRITERIA AND STANDARDS ~NTAINED WITH STIPULATION N0. 18. <br />.,Stipulation No 23 ,/~ <br />.w \^ <br />THE DIVISION DIRECL'S WECC TO SUBMIT REPORTS OF ITS SUBSIDENCE <br />MONITORING PFO(,RAM ON A SEMI-ANNUAL BASIS, CIX~P"lE[~ICING ONE MONTH AFTER <br />THE INSTALLATION AND INITIAL SURVEYING OF THE SUBSIDENCE MONUbffI~1TS. <br />FUIYrHER, DUE TO THE OOMpLEXIT'Y OF THE PERMIT AREA, GDOLOGY, PRESENCE OF <br />LANDSLIDES AND STEEP SLOPES, AND SENSITIVE HYDROLOGIC ELEMENTS, WECC IS <br />DIRECTED TO SUBMIT A PROPOSED SUBSIDENCE MONITORING REPORT FORMAT TYJ <br />THE DIVISION FOR APPROVAL. THIS REPORT FORMAT SHOULD RECOGNIZE THE <br />INII~ORTANCE OF CONPINUAL UPDATE OF SUBSIDENCE DATA INTERPRETATION, <br />MONITORING OF GROUND WATER LEVELS AND SPRING FLOWS, MONITORING OF MINE <br />INFLOW, AND SUBSURFACE GROUND O]NDITIONS WHICH COULD BE CORRELATED TO <br />SUBSIDENCE PREDICTION. THIS REPORT FORMAT SHALL BE APPROVED BY THE <br />DIVISION PRIOR TO THE 1ENT OF EXT'RACSION OF COAL WITHIN THE <br />SUBSIDENCE TEST PANEL DESIGNATED IN APPENDIX A TO WECC'S NOVEMBER, 1984 <br />PERMIT REVISION APPLICATION (PANEL 1W-LS). <br />