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2.05.6(6) <br />(b) A description of the worst possible consequences which subsidence, if it <br />occurred, could have for such structures or renewable resource lands. <br />(b)(i)(A) The premining land use of the permit area is classified as rangeland, wildlife <br />habitat and industrial. The premining land use of the USDA-FS managed <br />lands are described in the GMUG Land and Resource Management Plan as: <br />"Lands are managed for wildlife habitat management for one or more Forest <br />Service management indicator species. Semi-primitive -non-motorized, <br />semi-primitive motorized, and roaded natural recreation opportunities are <br />provided. Livestock grazing and vegetation treatments are allowable." The <br />majority of the area is rangeland and wildlife habitat. The area classified as <br />industrial is the previously disturbed area associated with the old King Mine. <br />The postmining land use of the permit area will be classified the same as the <br />premining land use which is rangeland, wildlife habitat, the UDSA-FS land <br />use and industrial. See Map 12, Premining Land Use and Map 13 <br />Postmining Land Use. <br />A description of the subsidence related phenomena predicted to occurwithin <br />the permit and adjacent area is presented in Volume IIIA, Exhibits 15, 16 & <br />17. <br />The aerial extent of predicted subsidence related phenomena within the <br />permit and adjacent area is shown on Map 27 Subsidence. Traditional <br />subsidence and predicted rock roll out areas are both shown on the Map. <br />The aerial extent for the traditional subsidence is calculated based on a 25 <br />degree angle of draw over areas where subsidence is expected to occur. <br />The rock roll out areas are predicted using the Colorado Rockfall Simulation <br />Program, version 4.0, developed by the Colorado Department of <br />Transportation, the Colorado School of Mines and the Colorado Geological <br />Survey. The results of the rock roll out predictions are presented in Volume <br />VII, Geotechnical Studies, Tab 11. <br /> <br />The Bruce Park Main Dam and Saddle Dam should not be affected by <br />subsidence since they lie entirely outside the limits of mining and are more <br />than 2,000 feet above the coal seam to be mined. The location of the mine <br />and its configuration are specifically designed to avoid subsidence or seismic <br />damage to the Bruce Park Dams. <br />PR-10 2.05 - 105 - 06/08 <br />~ PPkovEQ <br />/ I~~y~o ~ <br />