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The Factor of Safety (FOS) for sand and gravel with a (2H:1V) 26.6 degree slope in GC <br />classified material with an assumed internal angle of friction of 34 degrees can be approximated <br />by ignoring the cohesion component of the stability and simply evaluating the internal angle of <br />friction as follows: <br />FOS = Tangent of Internal Angle of Friction <br />Tangent of Actual Angle of Failure Surface <br />Tan 34° .6745 <br />FOS = _ = 1.349 <br />Tan 26.6° .5000 <br />This factor of safety exceeds the normal long term safety factor of 1.3, therefore, the final slopes <br />are acceptable. <br />Tomichi Pit, December 2013 U -3 <br />