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TABLE 3 <br />Resulting from YSTABL Computer Algorithm Search for Failure Surface <br />Tested Scenario FOS Computation Method <br />Deep Catastrophic Failure From 1.677 w/ Seismic Event Modified Bishop <br />Upper Refuse Pile Bench To North 2.051 w/o Seismic Event Modified Bishop <br />Fork of Gunnison <br />Failure Along Mined FSeam 1.683 w/ Seismic Event Janbu BlocJt Searrh <br /> 2.084 w/o Seismic Event Janhu Block Search <br />Failure Confined within Upper 1.755 w/ Seismic Event Modified Bishop <br />Refuse Pile Face <br />Failure Extending Through Upper 1.301 w/ Seismic Event Modified Bishop <br />Refuse Pile and Emerging Through 1.580 w/o Seismic Event <br />Portal Bench Slope <br />Failure of Upper Refuse Pile Bench 1.625 w/ Seismic Event Modified Bishop <br />Prior to Placement of Refuse <br />The output files generated by the XSTABL computer program aze presented <br />in Appendi4 C. The results indicate that failure through the mined F-seam is <br />unlikely, as is a deep catastrophic failure which would involve the entire WEM <br />surface facility bench. Failure is most likely to occur through the northern one-third <br />of the mine refuse stockpile and through the face of the slope north of the upper <br />refuse bench, in the vicinity of the portal bench. However, because parameters used <br />for this study are extremely conservative, the FOS of 1.301 appears to be a worst case <br />scenario. <br />12 <br />