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0 2.05.6(6) <br />• <br />The operator will install subsidence monuments over the 1 West Mains <br />where they go under Terror Creek and at or near the transmission line towers <br />located immediately north and south of the 1 West Mains. These monuments <br />will be utilized to verify that subsidence does not occur within the limited <br />extraction zone. <br />At this time there are no plans to mine under the Terror Ditch, or to mine <br />under Terror Creek Reservoir. A subsidence monitoring plan will be <br />developed prior to mining, within the angle of draw of the ditch. <br />The B Seam mine plan has gate road entries for the B -8 through 1311 panels <br />under panels D -7, D -8, and D -9. This area of multiple seam mining has an <br />increased risk to damage the land surface through increased tensile strains. <br />It is expected that this increased strain will cause surface fractures to form. <br />Since this area of multiple seam mining underlies Sheep Corral Gulch, the <br />Forest Service is concerned that surface fractures may cause interruption of <br />surface flows (when present), damage stock ponds or create large fractures <br />that will need to be mitigated. <br />The Operator will perform on- the - ground visual monitoring for subsidence <br />damage (including fracturing) in Sheep Corral gulch in the area where <br />multiple seam mining will occur. This monitoring will initially be performed <br />within 3 months after the gate road entries are developed, and on a quarterly <br />basis thereafter during mining of the respective panels, and for six months <br />post mining (monitoring to be done as weather permits). The results of each <br />monitoring event described in the will be sent to the Forest Service and the <br />DRMS within one month. <br />PR -12 2.05-157- 07/10 <br />��PRovEp <br />