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- t~ . <br />GEX Colorado, Inc. <br />Post Office Box W <br />Palisade, Colorado 81526 <br />Attn: Dale Fenwick <br />RE: Stability Evaluation <br />Cameo Mine Refuse Pile <br />Palisade, Colorado <br />Gentlemen: <br /> <br />November 18, 1980 <br />At your request, personnel of Rocky Mountain Geotechnical <br />have performed additional analysis on the proposed refuse <br />pile at the above-referenced site. This letter should be <br />considered an addendum to our report of October 24, 1980 <br />regarding refuse pile stability. <br />A concern was expressed to Rocky Mountain Geotechnical that <br />the shear strength values assumed for the native bedrock <br />materials (~ = 38°, c = 1000 psf) may be unsuitably high for <br />the materials existing on the site. These values were <br />selected as being reasonable and somewhat conservative, <br />strength values for existing materials, based upon avail- <br />able information. However, in order to determine the <br />sensitivity of the embankment to variations in bedrock <br />shear strength, an additional analysis was executed, using <br />= 36° and ~ = 200 psf for the bedrock materials. These <br />Strength values are the same as those assumed for the native <br />alluvial soil above bedrock. <br />The analysis was performed on the 2.3 to 1 slope with the <br />5025 crest elevation, and the SSTABI computer program was <br />used. The critical failure circle geometry and minimum <br />factors of safety were exactly the same as those obtained <br />in the original analysis. Thus, the reduction of shear <br />strength values to ~ = 36° and ~ = 200 psf for the bedrock <br />materials had no effect whatsoever on the stability of the <br />pile. Critical circle information from this analysis is <br />included with this letter. <br />Rocky MoZntain Geotechnical <br />.4 Chie vm9 Hdrmony with Edrfh <br />The Railroad Station • 555 E. Pikes Peak Ave., Suite 107 • Colorado Springs, Colorado 80903 • (303) 634-1999 <br />