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�` <•] MORRISON-KNUOSEN COMPANY,INC. <br /> 1 .3:8 Required. Long Range Capacity of the Refuse Pile <br />�!• As noted earlier, the present refuse pile has a volume of about 1 .5 <br /> .million cubic yards. From the flow diagram supplied by Mid-Continent, re- <br /> fuse is indicated to be about 11% of the raw coal production, 43 tons of <br /> refuse out of 375 tons of raw coal per hour. For estimation of required <br /> capacity, a maximum of 20% of refuse was considered. Using 1 million tons/ <br /> year production, and a 40 year life, a refuse pile of about 8 million tons <br /> i <br /> capacity will be needed. Density of the refuse. pile is one of the physi- <br /> cal properties to determine through testing. For the purpose of this pre- <br /> liminary study, the density of the refuse material was assumed to be approxi- <br /> mately 1 .2 ton per cubic yard (90 pounds per cubic foot) . The alternate <br /> sites were designed with the capabilities of being expanded to accomodate <br /> additional refuse disposal in the event of extension to a 60 year mine life. <br /> 1 .4 STABILITY ANALYSIS OF TkiE REFUSE PILE <br /> A stability analysis of the existing and proposed refuse piles was <br /> performed to provide a guideline for refuse pile geometry. <br /> A site inspection of the present refuse pile showed no indication of <br /> failure, sloughing or seepage. The present refuse pile is standing at its <br /> steepest, 380 slope angle, for a height of approximately 125 feet. <br /> 1 .4.1 Method of Analysis <br /> A limiting equilibrium method of analysis, using an IBM 370/58 computer, <br /> was used in analyzing the stability of the refuse pile. Considering the <br /> physical properties of the refuse material and foundation, a curvilinear <br /> . type of failure surface was considered most likely. The computer program <br /> automatically generates and analyzes hundreds of potential failure surfaces, <br /> 1-9 <br />