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- 9 - <br />• below about 6,875. Potential swelling soil will be of im- <br /> portance in evaluating the stability of the large fill of <br /> the crushing and screening level, foundations of which can <br /> be partly formed by the Mancos Shale or by products of its <br /> weathering. <br /> The potential occurrence of expansive soils will have <br /> to be taken into account in the design of the waste disposal <br /> pile that will be located within the same geologic formation. <br /> 3.5 SHEET FLOW FLOODING AND EROSION <br /> Parts of the area have been mapped as being exposed <br /> to the hazard of sheet flow flooding and erosion. Natural <br /> slopes of the area do not carry traces of severe erosion, <br /> but minor erosion problems can be identified at a few <br />• locations within the mine. Generally, however, the surface <br /> drainage system within the mine is very efficient and most <br /> of the slopes (both cuts and fills) are protected against <br /> erosion by the vegetation. <br /> 4.0 PRESENT INTEGRITY OF MINE SURFACE FACILITIES <br /> 4.1 GENERAL <br /> In this section, our opinion about the integrity of <br /> individual parts of the mine surface facilities is presented. <br /> The structures or facilities that, in our opinion, require <br /> a geotechnical evaluation are: the diversion ditch cut at the <br />1 <br />• <br />fan level, rock cuts, soil cuts, man-made fills; included in <br /> cewnoaoeowsu-nw.wc. <br />