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~~ <br />SUMMA RI' <br />Project Location: "'-~^=,..,~,.'~ :~ X~CamP~- <br />about 15 miles north anc: east of Grand <br />Junction, Colorado. <br />Project Description: Coal processing waste storage pile. <br />Slope Stability Analysis: Based upon computer-assisted <br />analysis, the slope configuration <br />provided to ROCKY MOUN'PAIN GEOTECHNIC'AL, having 3.3:1 <br />side slopes and a crest elevation of about 4980, will be <br />stable, witY a minimum factor of safety of 2.302. A <br />somewhat steeper and higher slope configuration could <br />also be used. <br />Pile Storage Volume Optimization: Again using computer- <br />assisted analysis, tine <br />slope configuration yielding the maximum storage was <br />fcund to consist of ~•' --'°~~- ~ * '^ -~.~de <br />horizontal benches at 3.6~;--ve~rtica-1 -spacing, with a <br />crest elevation of 5025. This configuration had an <br />average slope gradient of 2.3:1, and a minimum factor <br />of safety of about 1.7, The storage volume of this <br />pile configuration will be about 2,240,000 cubic yards. <br />Additional discussion and more complete recommendations are <br />included in the body of this report. Slope cross-sections, <br />recommended pile contours, and other pertinent information <br />are included in the Appendix. AlI recommendations are subject <br />to the limitations contained herein. <br /> <br />