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• 2.05.6(6) <br />The operatorwill visually inspect known historic and modern landslides within <br />the permit and adjacent area for stability in June and November of each <br />year. Additionally, known historic and modern landslides will be visually <br />inspected once a month for six months immediately following retreat <br />extraction in their immediate proximity. <br />The operator will evaluate each rejuvenated or new landslide to determine <br />what the apparent cause of the modern movement might be. If appropriate, <br />mitigative methods will be proposed to minimize hazard to the mine facilities, <br />public health and safety, and the environment. <br />The visual subsidence monitoring program will continue and survey <br />monitoring will be performed quarterly. The results of the survey monitoring <br />will be studied for abrupt changes in surface levels which might indicate <br />mining impact. <br />• The operator will both survey and visually monitor the effectiveness of the <br />ground control methods implemented during development mining through the <br />fault trace. Any failure of the ground support will be immediately reported to <br />the DMG. The report will include the operator's remedial roof support plan. <br />Ground support failure is defined as a cave of debris of over one mining <br />height within the fault trace. <br />At this time there are no plans to mine under the Terror Ditch, the power line <br />which runs parallel to Terror Creek or to mine under Terror Creek Reservoir. <br />A subsidence monitoring plan will be developed prior to mining, within the <br />angle of draw of the ditch or power line, and within one mile of the reservoir. <br />The results of the subsidence monitoring programs and the results of the <br />visual inspections for mass movement features will be submitted semi- <br />annually for the reporting periods ending in June and December, within 30 <br />days of the end of the reporting periods. <br />(f)(vi) Map 14, Mine Plan, presents the location of the underground workings. Map <br />• 27, Subsidence shows the subsidence survey monument locations and the <br />PR-04 2.05 - 113 - 02/22/Ot <br />