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0 MORRISON-KNUDSEN COMPANY,INC. <br /> calculating the factor of safety for each surface. The factor of safety <br /> Cof each potential failure surface is defined as the ratio of the shear <br /> force resisting the movement of the rock mass above the failure surface <br /> to the shear force trying to induce this movement. <br /> 1 .4.2 Procedure for Analysis <br /> A few profiles of the refuse pile were analyzed to determine their <br /> factors of safety using the assumed physical properties. Figure 1-3 shows <br /> profile number 1 , normal to the slope face, used for stability analysis. <br /> In absence of any failing or failed condition in the existing refuse pile, <br /> no back calculation was possible to check the validity of the assumed <br /> physical properties . <br /> Profiles from proposed cross-ridge refuse piles were analyzed using <br /> different combinations of slope heights and angles to arrive at some guide- <br /> lines for the proposed expansion. <br /> Based upon site inspection, for the purpose of this analysis, it was <br /> assumed that the refuse pile had a sufficiently high permeability to pre- <br /> vent any pore pressure build-up. <br /> 1 .4.3 Discussion of Results of Stability Analysis <br /> Selected results of the analysis of the present refuse pile are shown <br /> on Table 1 .4.3-1 . <br /> TABLE 1 .4.3-1 <br /> SELECTED RESULTS OF ANALYSIS OF THE <br /> PRESENT REFUSE PILE <br /> PROFILE SLOPE HEIGHT SLOPE ANGLE FACTOR OF SAFETY <br /> NUMBER (ft) (degrees) <br /> C 1 125' 38" 1 .50 <br /> 2 160' 280 1 .58 <br /> 1-10 <br />