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OCCURENCE. IF ANY EVIDENCE OF EXISTING LANDSLIDE DEPOSITS IS ENCOUNTERED, THE OPERATOR SHALL DEFINE THE NATURE AND EXTENT OF THE PRE-EXISTING SLOPE INS 74. LONGWALL MINING AT THE WEST ELK MINE IN E-SEAM PANELS 1 THROUGH 12 MUST NOT BEGIN UNTIL THE MEASURES REQUIRED BY STIPULATION 75 HAVE BEEN SUBMITTED TO THE DIVISION AS A TECHNICAL REVISION AND BEEN APPROVED. 75. LONGWALL MINING AT THE WEST ELK MINE IN E-SEAM PANELS 1 THROUGH 12 MUST NOT BEGIN UNTIL MEASURES APPROVED BY THE DNISION OF WATER RESOURCES, OFFICE OF THE STATE ENGINEER, COLORADO DEPARTMENT OF NATURAL RESOURCES TO STRENGTHEN MONUMENT DAM AND ITS SOUTHERN ADJOINING LANDSLIDE HAVE BEEN INSTALLED, AND UNTIL AN ENGINEERING CERTIFICATION, DOCUMENTING THAT THE MEASURES WERE INSTALLED IN ACCORDANCE WITH THEIR DWR/OSE-APPROVED DESIGNS, ALONG WITH A COPY OF A FINAL STATEMENT OF ACCEPTANCE FROM THE DWR/OSE, HAS BEEN SUBMITTED TO THE DNISION OF MINERALS AND GEOLOGY. 76. MOUTAIN COAL COMPANY WILL INFORM THE MONTROSE OFFICE OF THE COLORADO DIVISION OF WATER RESOURCES PLACEMENT OF ALL NEW SURVEY MONUMENTS. MOUNTAIN COAL COMPANY WILL COPY THE MONTROSE OFFICE OF THE COLORADO DNISION OF WATER RESOURCES ON ALL SURVEY, PIEZOMETER, AND ACCELEROMETER/SEISMOMETER MONITORING IN AND AROUND MONUMENT DAM. MOUNTAIN COAL COMPANY WILL NOTIFY THE MONTROSE OFFICE OF THE COLORADO DIVISION OF WATER RESOURCES WHENEVER THE PEAK GROUND ACCELERATION (PGA) THRESHOLD IS EXCEEDED DURING THE MONITORING PERIOD, WHETHER MINE- INDUCED ORNATURALLY-OCCURRING. 77. THE PRIOR LIABILITY AMOUNT OF $13,546,180 AND REVISED LIABILITY AMOUNT OF $13,570,455 SHOWN ON THE DECISION FORM FOR MR-337 ARE SUBJECT TO FINAL APPROVAL OF PERMIT RENEWAL NO.S.