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2.05.6(6) <br />Immediately following retreat extraction in the immediate proximity of a <br />stream, spring or pond, the intensity of monitoring that feature will be <br />increased to once a month for six months. <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 />i• <br />PR-08 2.05 - 113 - 07/03 <br />/1 P1Ro vet <br />yIz 5/03 <br />