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ACCELEROMETER/SEISMOMETER MONITORING IN AND AROUND MONUMENT DAM. <br />MOUNTAIN COAL COMPANY WILL NOTIFY THE MONTROSE OFFICE OF THE COLORADO <br />DIVISION OF WATER RESOURCES WHENEVER THE PEAK GROUND ACCELERATION (PGA) <br />THRESHOLD IS EXCEEDED DURING THE MONITORING PERIOD, WHETHER MINE - <br />INDUCED OR NATURALLY -OCCURRING. <br />ACCEPTED AND AGREED: <br />SAFETY <br />Operator Title <br />DIVISION OF RECLAMATION, MINING & <br />COLORADO DEPARTMENT OF <br />NATURAL RESOURCES <br />Division Director <br />AG Alpha No. NR LR TYB <br />AG File No. PNR/3928/JD <br />Page 9 of 8 <br />C-RN-18 <br />