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1 <br />PURPOSE AND SCOPE: <br />The purpose of this report is to provide results of an investi- <br />' gation and analysis of stability conditions for a proposed waste <br />disposal site at the Red Canyon mine. Information on the proposed <br />configuration of slopes were obtained from plan and profile sheets <br />provided by Ute Engineering and Surveying Company in Delta, Colorado. <br />There are several different types of instability which may <br />' affect fill slopes. These include large-scale mass instability <br />(landslide type movement), raveling or sloughing, and erosion. The <br />1 stability analyses performed as part of this investigation deal onl}~ <br />' with the large-scale mass instability or landsliding type of problem. <br />The factors of safety provided refer only to this type of instability. <br />We have assumed that the other aspects of instability of the proposed <br />fill slopes have been sufficiently covered by others. <br />GENERAL SITE CONDITIONS AND PROJECT CHARACTERISTICS: <br />The site is located approximately three miles northwest of <br />' Cedaredge, Colorado in Delta County. A general location diagram in <br />map form will be found in the Appendix of this report. <br />' The topography of the site tends to be moderate to steeply <br />' sloping in a westerly direction. Major drainage in the vicinity of <br />the site trends in a south to southwesterly direction. <br />' Physiographically, the site lies in the Colorado Plateau <br />Physiographic Province near its northwest margin with the Southern <br />t Rocky Mountain Province. The site lies in an area containing <br />' Cretaceous Age sediments, such as the Mesa Verde grouF and the <br />Mancos Shale. The rock types most commonly observed consist of <br />2 <br />