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Bedrock - underlies the entire site at varying depth and <br /> is assumed to be of sufficient strength to prevent any potential <br /> shear surface associated with failure of the waste piles from <br /> developing within the bedrock. <br /> Alluvial soils fill the valley bottom and underlie the waste <br /> piles to a large extent at locations where the valley is reason- <br /> ably wide. The coarse nature of alluvial sediments results in <br /> its having similar physical properties to those of the waste <br /> material . <br /> Colluvial soils are developed on steeper slopes above the al- <br /> luvial valley. Their depth, as it has been discussed in <br /> Section 3.1 , varies at different locations. It is probable <br /> that colluvial soils cover the alluvium at certain locations. <br /> The accurate contact between alluvium and colluvium was <br /> estimated. Its accurate determination would require drilling. <br /> Physical properties of individual materials were developed either <br /> with the help of simple soil testiig or they were based on data available <br /> from literature describing similar matererials. A more detailed dis- <br /> cussion of physical properties is presented in Appendix A. <br /> As can be seen on both sections, it has been assumed for the <br /> purposes of the analyses that the waste piles are completely underlain by a <br /> layer of colluvial soils at all locations. Since the colluvial soils have <br /> the lowest shear strength of all materials at the site, this assumption <br /> is conservative. <br /> The same general approach has been taken in the stability analy- <br /> sis of each stability section. Factors of safety have been calculated <br /> for potential sliding along selected surfaces which represent realistic <br /> failure mechanisms for the waste piles. <br /> _ 20 - <br />