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Geographic Setting <br />,• <br />The Eagle No. 5 Mine is an underground coal mine that operates <br />through portals located on an isthmus of land between the <br />Yampa River and the Williams Fork (of the Yampa). The <br />portals are driven in the F seam from its outcrop and diverge <br />underground creating eastern and western operating areas. <br />The area of concern lies in the western operating areas. <br />Entries are driven to the north to a point at which they <br />turn west and cross underneath the Yampa River, approximately <br />125 feet below the river. This set of westerly heading <br />entries is called the 2 West Mains. <br />The topography above the 2 West Mains is rugged. Immediately <br />to the west of the Yampa River, the topography ri ses 200 <br />feet in 300 feet horizontally, and over the length of the <br />mains, the total rise is 800 feet in 2,600 feet horizontally. <br />Figure 1 is a photograph taken from the eastern bank of the <br />Yampa looking westward to the hillside under which the 2 West <br />Mains lie. The vertical relief is substantial and the <br />hillside is maintained at a high angle by the presence of <br />numerous sanstone benches. <br />Exhibit A is a topographic map of the area on which the Mains <br />• have been superimposed. This Exhibit will be referred to again <br />~ throughout this report. <br />