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~J <br />Table 1 <br />Summary-Factor of Safety Analyses <br /> Probability <br /> Average Ezlsting <br /> Effective Stress Analysts Total Stress Analysts Condition <br />Outcome of Landslide Before Plns After Plns Before Plns After Plns After Pins <br />1. Rapid Movement 50% 13% 50% 19% 16% <br />(F.S.<1.0) <br />2. Slow Movement 32% 31% 24% 27% 29% <br />(1.0<F.S.<1.2) <br />3. Very Slow Movement 17% 45% 8% 39% 42% <br />(1.2<F.S.<1.5) <br />4. Extremely Slow 1% 11% 18% 15% 13% <br />Movement <br />(F.S.>1.5) <br />Total 100 100 100 100 100 <br />~: Factor of safety only takes into account the effect of the pins and their contribution to shear strength along the <br />toe of the landslide. <br /> <br />Probability assumes that a factor of safety of 1.0 represents a 50 percent probability that rapid movement will <br />occur. The calculated factor of safety using measured shear strengths of 13t was 1.O5t and rapid movement <br />was incipient, indicating that a 50 percent probability with shear strength of 12t is reasonable. <br />0626024\60558.1/CET <br />