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December 1986 1 863-2060 <br />• 1.0 INTRODUCTION <br />1.1 Background <br />The Yampa Valley Coal Corporation (YVCC) currently mines the <br />Wadge coal seam at the Colorado Yampa strip mine in Routt County, <br />Colorado (Figure 1). Within the study area, the Wadge seam aver- <br />ages 10.5 feet in thickness and dips an average of 7 degrees to <br />the northwest. In Area 51, which is adjacent to and immediately <br />north of Area 9/10, it is mined up-dip in a series of strike-line <br />pits as shown in Figure 2. <br />Energy Fuels Corporation began mining the Wadge seam in Area 9/10 <br />approximately 10 years ago. Regraded and largely revegetated <br />mine spoil materials overlie northwest- dipping Mesaverde units <br />in Area 9/10. In a March 4, 1986 correspondence to Colorado <br />• Yampa Coal Company (CYCC), the Colorado Mined Land Reclamation <br />Division (MLRD) expressed general concern about the "mass sta- <br />bility" of Area 9/10. <br />1.2 Purpose and Sco <br />The site investigation described in this report <br />the purpose of evaluating slope stability co <br />9/10. The scope of the field investigation and <br />ses were outlined in our proposal to YVCC dated <br />Tasks involved in the Area 9/10 slope-stability <br />briefly described as follows: <br />was performed for <br />editions in Area <br />associated analy- <br />December 1, 1986. <br />investigation are <br />1) Drilling and sampling of mine spoil and the underlying <br />bedrock units to allow characterization of geotechnical <br />conditions at the three representative locations in Area <br />9/10; <br />2) Monitoring of ground-water conditions in the vicinity of <br />. the borings; <br />Golder Associates <br />