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1 <br />1 <br />' The water condtions were varied from dry (Ru = 0) to saturated <br />(Ru = 0.46). <br />1 Tt~e results of the stability analyses are shown on Figure <br />3 as a plot of Factor of Safety vs. Ru values. These results <br />include the following: <br /> 1. Under dry conditions, the Factor of Safety exceeds 2.0 <br /> for all cases. <br /> <br /> 2. With the dump Half saturated, the Factor of Safety <br />' exceeds 1.6 for all Cases examined. In our opinion, <br /> this represents an adverse case unlikely to occur, <br />' considering the regional drainage design, permeability <br />fill <br />f th <br />d d <br />i <br />l <br />i <br />f <br />ll <br />i <br />bl <br />k <br />t <br /> o <br />, reg <br />ra <br />e <br />ona <br />n <br />a <br />, an <br />ra <br />nage <br />an <br />e <br /> underlying each lift. <br />1 <br /> 3. Under the extreme case of saturated dump, the minimum <br /> Factor of Safety (Case C) is about 1.15. <br />' 4. The theoretical increase in stability gained by <br />placing future spoil in 4-foot lifts instead of <br />' continuing to end dump is about 5 to 10 percent. The <br />actual difference may be less due to our assumptions <br />of tl~e strength and density increase. <br />General Recommendations and Conclusions <br />' 1. Stability: Based on our stability analyses, the final <br />' dump configuration will be stable. The most important <br />factor affecting stability will be the water <br />' conditions within tt~e dump. However, even for the <br />extremely unlikely condition of complete saturation, <br />' the dump would he stable. <br />7 <br />Golder Associates <br />