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As shown on Figure 2, five different conditions were evaluated <br />J for each specified pile height. These conditions consisted of <br />7 (1) effective stress analysis with pore pressure build up within <br />II the fine refuse pond located at various distances from the <br />1 final toe location; (2) effective stress analysis with <br />J piezometric surface located at gcound surface (drain fully <br />1 functioning) with low strength subsurface soil layer and no fine <br />refuse; (3) effective stress analysis with pore pressure build <br />up to elevation 6300 (drain plugged with excessive infiltration <br />I through pile) with no fine refuse pond; (4) piezometric surfaces <br />1 located at ground surface with high strength subsurface soils; <br />] and (5) total stress analysis with and without fine refuse pond <br />located near toe. <br />Condition 1 was evaluated to determine how the location of the <br />I fine refuse pond (low strength, high pore pressure area) would <br />I effect the stability of the pile. Conditions 2 and 4 were <br />analyzed to determine if strength variation in the subsurface <br />1 soils would affect the stability of the pile. Condition 3 was <br />1 evaluated to determine what effect a plugged drain and very high <br />infiltration rates would have on stability. Condition 5 was <br />~ evaluated to determine the effect of short-term stability (end of <br />construction). <br />The minimum factors of safety for each of the evaluated <br />conditions were determined using a computer-assisted limit <br />equilibrium method of slices. This particular program utilizes <br />l Spencer's methods of analysis. The program is capable of <br />1 analyzing stability conditions not only in circular modes of <br />6 <br />