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-61- Stipulation No. 18 THE SUBSIDENCE MONITORING NETWORK SHALL BE SURVEYED UTILIZING CONVENTIONAL GROUND SURVEYING TECHNIQUES, DESIGNED TO ACHIEVE HORIZONTAL ACCURACIES COMPLYING WITH THE U.S. DEPARTMENT OF COMMERCE'S "SECOND ORDER, CLASS II" SURVEY STANDARDS, AND VERTICAL ACCURACIES NO LESS THAN + 0.2 FEET. THIS GRID SHALL BE SURVEYED TWICE PRIOR TO THE INITIATION OF SUBSIDENCE. IN CONJUNCTION WITH THESE SURVEYS WECCC SHALL SELECT AND ESTABLISH A MINIMUM OF SIX TRIANGULATION BENCH MARK MONUMENTS OUTSIDE THE AREA OF ANTICIPATED SUBSIDENCE EFFECTS, FOR THE PURPOSE OF CORRELATION WITH AERIAL PHOTOGRAMMETRIC POST-SUBSIDENCE SURVEYS. Stipulation No. 19 WECC HAS REQUESTED PERMISSION TO COMPLETE A PRE-SUBSIDENCE AERIAL PHOTOGRAMMETRIC SURVEY OF THE SUBSIDENCE MONITORING GRID, FOR THE PURPOSE OF CORRELATION WITH THE FIELD SURVEY RESULTS. IT IS WECC'S INTENTION TO UTILIZE AERIAL PHOTOGRAMMETRIC METHODOLOGY TO MONITOR POST-SUBSIDENCE MOVEMENTS OF THE SUBSIDENCE MONUMENTS. THE RESULTS OF THE PRE-SUBSIDENCE FIELD AND AERIAL PHOTOGRAMMETRIC SURVEYS SHALL BE COMPARED FOR EACH GRID MONUMENT. THE AERIAL SURVEY WILL BE ACCEPTED AS ACCURATE AND WILL BE USED FOR SUBSEQUENT POST-SUBSIDENCE MONITORING, IN THE EVENT THAT THE AERIAL PHOTOGRAMMETRIC AND FIELD SURVEYS CORRELATE WITH AN AVERAGE SURVEY POINT LOCATION DEVIATION OF LESS THAN 0.2 FEET VERTICALLY AND HORIZONTALLY, WITH SURVEY POINT LOCATION DEVIATIONS OF LESS THAN 0.4 FEET VERTICALLY AND HORIZONTALLY FOR LESS THAN 95% OF THE SURVEY POINTS, AND WITH NO SINGLE SURVEY POINT LOCATION DEVIATION VERTICALLY OR HORIZONTALLY IN EXCESS OF 0.8 FEET. Stipulation No. 20 WECC HAS REQUESTED PERMISSION TO COMPLETE AERIAL PHOTOGRAMMETRIC SURVEYS OF THE SUBSIDENCE MONITORING GRID SUBSEQUENT TO THE 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.