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pressure measurements. The test method used was a "staged" test in <br />• which one sample is repeatedly brought to impending failure using an <br />increasing series of confining stresses. This test method is a com- <br />paratively recent development which is generally conceded to yield more <br />consistent and accurate results than would be achieved by testing <br />three or more individual remolded specimens to the point of failure <br />using different confining pressures for each sample. The triaxial <br />test results, including stress paths, are included in the Appendix of <br />this report. The triaxial test resultad in an effective friction angle <br />of 32.12 degrees, with an effective cohesion of 1.42 psi or 204.5 psf. <br />SLOPE MODEL: <br />In order to properly analyze the stability of the proposed waste <br />• pile slope, it was first necessary to develop a mathematical and geo- <br /> metric model of the slope conditions to be used for purposes of slope <br /> stability analysis. The development of this model is described in <br />this section. <br />The initial model for slope stability calculations was based upon <br />the proposed plan and sections for the waste pile which were provided <br />to ROCKY MOUNTAIN GEOTECHNICAL. Upon inspection of the plan and con- <br />tours for the proposed pile it was felt that Section A-A on the plan <br />provided to ROCKY MOUNTAIN GEOTECHNICAL would probably be the most <br />critical section. This section represents the worst conditions in <br />terms of slope height, slope angle, and the sedimentation pond located <br />directly at the toe of the slope. Therefore, this section was used to <br />delineate the confines of the waste material. for the initial analysis. <br />The location of the native ground surface was obtained from a <br />1-inch 100-ft. topographic map of the site provided to ROCKY MOUNTAIN <br />