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_, <br />bench. <br /> <br />- o Underground coal waste constructed at a slope of 25 degrees <br />from the toe to within 4 feet of the top of the slope. <br />0 30 feet high, 60 feet wide berm constructed of coal waste. <br />• o Four-foot depth of recompacted fill material placed over <br />coal waste. <br />- 0 10 feet high, 20 feet wide rock berm constructed in toe <br />area. <br />• Slope stability results under these conditions are represented on <br />Figure 7. <br />Design conditions represented by the above alternatives are valid <br />for the central portions of the mine bench. However, conditions <br />• encountered at the northern and southern boundaries of the bench <br />along with topographic constraints require different design <br />- conditions in these areas than in the central portions of the <br />bench area. Therefore, specific evaluations of the end <br />conditions were performed, the results of which are presented in <br />• Figure 8. <br />4.4 SUMMARY QF RESULTS <br />Evaluations performed representing the conditions encountered <br />during field investigations are presented in Figures 6 through 8. <br />The design incorporates for the central portion of the bench: <br />o An excavated and recompacted foundation area at the toe of <br />18 <br />