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<br />' of the analytical results presented herein, .or perhaps additional analysis <br />for more specific site conditions and dump configuration. <br />' B. AUTHORIZATION <br />' The analyses and testing discussed herein were conducted as part of the <br />overall program of site investigation and mine development for the Red <br />Wing Mine project. This part of W, A. Wahler and Associates' work on <br />' the project is being carried out pursuant to Agreement No. 832 (dated <br />April 7, 1975), with the Colowyo Coal Company of Denver, Colorado, for <br />furnishing consulting engineering services. <br />C. PURPOSE AND SCOPE <br />' The purpose of the work covered in this report was to: a) recover samples <br />' in and determine the properties of the foundation materials underlying <br />the waste dump; b) evaluate the stability of the waste dump for various <br />combinations of slope angle and embankment height and; c) evaluate the <br />' stability of the spoil bank with a dragline operating near its crest. <br />Specifically, this work consisted of the following tasks: <br />' 1) Field investigation program consisting of seven exploratory soil <br />' borings, and recovery of undisturbed Shelby tube samples, and <br />bag samples of the foundation soils. <br />' 2) Laboratory testing program to evaluate engineering properties of <br />the foundation soils. <br />3) Analysis of field and laboratory test results, and the selection <br />' of engineering properties of both the foundation soils, and the <br />waste dump materials. <br />' 4} Analysis of the stability of the waste dump for various combinations <br />of slope angle, embankment height, and foundation inclination, <br />using static and "pseudo-static" types of analyses. <br />1 <br /> <br />' O ~ O~fILCfI Project 0823 I-2 <br />