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The Factor of Safety (FOS) for gravel with n (2H:1 V) 26.6 degree slope in GC classified <br />material with an assumed internal angle of friction of 34 degrees can be approximated by <br />ignoring the cohesion component of the stability and simply evaluating the internal angle of <br />friction as follows: <br />FOS <br />Tangent of Internal Angle of Friction <br />= <br />Tangent of Actual Angle of Failure Surface <br />Tan 340 .6745 <br />FOS = _ = 1.349 <br />Tan 26.60 .5000 <br />This factor of safety exceeds the normal long term safety factor of 1.3, therefore, the final slopes <br />are acceptable. <br />Graffft March 2012 U-3 <br />