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celerations in rock with 90% probability of not being exceeded in <br /> 10, 50, and 250 years. The corresponding accelerations for Coal <br /> Basin are < 0. 04 g, 0. 04 g , and 0. 11 g. <br /> Based on these data , and in view of the character of the <br /> waste pile material , the construction methods employed , the <br /> character of the most probable failure mechanisms, and the risk <br /> to life in the event of a pile failure, we consider that a design <br /> horizontal earthquake acceleration of 0.05 g is appropriate for <br /> this project. This has beeen applied in pseudo-static stability <br /> analyses of the waste pile. <br /> 2 <br /> 114 <br />