GENERAL42468

• Permit No: C1980007
• IBM Index Class Name: General Documents
• Doc Date: 8/26/1985
• Doc Name: Proposed Decision & Findings of Compliance for PR1
• From: Addition of 1,630 Acres
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

-6-
3c (~w Stipulation No. 19 J
C 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. 18.
Stipulation No 20 r
~ ~~ 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 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. 2l
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 DEPOSIT 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.
'~ Stipulation No. 22 J
~~q THE DIVISION DIRECTS WECC AS A PORTION OF ITS SUBSEQUENT PERMIT
APPLICATIONS FOR THE MINE TO SUBMIT A REVISED SUBSIDENCE EVALUATION.
THE SUBSIDENCE EVALUATION FOR THE NEXT PERMIT PERIOD SHALL INCORPORATE
THE RESULTS OF SUBSIDENCE MONITORING AND THE LANDSLIDES STABILITY
STUDIES STIPULATED ABOVE IN DESIGNATED REFINED SAFE AREAS BUFFER
BOUNDARIES TO BE OBSERVED IN THE FUTURE MINING BENEATH CRITICAL AREAS,
INCLUDING THE DRY FORK OF MINNESOTA CREEK, BEAVER RESERVOIR AND THE
LANDSLIDE DEPOSITS ADJOINING IT. THE AMENDED SUBSIDENCE EVALUATION
SHALL INCLUDE THE PROPOSAL OF APPROPRIATE SUBSIDENCE MONITORING
NETWORKS WITHIN EACH OF THESE CRITICAL AREAS. '