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Mine #4 <br /> Cohesion F . Angle Density Pore Press . Safety <br /> Run # lb/sq . ft Degrees lb/cu . ft . Ratio Factor <br /> #1 1040 31 108 . 50 1 . 94 <br /> #2 700 30 108 . 60 1 . 32 <br /> #3 600 35 108 . 50 1 . 39 <br /> #4 800 32 108 . 50 1 . 65 <br /> Run #1 uses the residual cohesion and the residual angle of <br /> friction , which is conservative, and results in a safety factor of <br /> 1 . 94 . Runs #2 uses a considerably lower cohesion and slightly lower <br /> friction angle . The pore pressure ratio is also increased to 0 . 6 <br /> and a safety factor of 1 . 32 is still achieved . <br /> Run #3 shows a higher friction angle which may occur if material <br /> that did not pass the #4 sieve is included . The cohesion for this <br /> case has also been lowered slightly . <br /> The expected case for long term stability is Run #4 , which results <br /> in a safety factor of 1 . 65 . This run is included in Appendix B . <br />