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~' <br />Slope/W utilizes modified Bishop analysis methods for circular-shaped failure <br />surfaces. A parametric analysis of two waste pile slope configurations, waste <br />strength and water conditions was performed. The following sections discuss the <br />development of the models, selection of strength and density parameters, the water <br />conditions modeled, and the results of the analysis, <br />Model Development <br />The models analyzed were based upon our understanding of the existing <br />geometry along Section A-A through the waste pile, perpendicular to the face. The <br />location of the section is shown on Fig. 2. The topographic map shown on Fig. 2 is <br />based on a flight performed on March 23, 1995. Basin Resources, Inc. indicated that <br />additional coal waste was placed along the face of the pile and that the current <br />configuration of the pile is sloped between 2.0:1 and 2.5;1 for the entire height of the <br />pile. We first analyzed the existing waste pile with a top elevation of 7164 and a <br />2.0:1 (horizontal vertical) slope (Fig. 3). We also analyzed the waste pile with a 2.5:1 <br />slope. The location of the waste/soil/bedrock interface at the bottom of the waste pile <br />was based upon the results of our boring and a topographical survey provided by <br />Basin Resources, Inc. dated November 1986. <br />For each of these models a three layer soil configuration was used, with the <br />layers consisting of the coal waste, a 6-foot thick soil (or weathered bedrock) layer, <br />and then bedrock. The soil layer was included in the model to evaluate the effect of <br />a disturbed zone of soil/refuse at the base of the pile. <br />Material Properties <br />We estimated material properties based upon our review of previous studies <br />and the results of the current investigation. These were discussed in detail in the <br />preceding section COAL PROCESSING WASTE PILE CONDfiIONS. <br />3ASIN RESOURCES, INC. <br />OTL'T 2],79] 6 <br />