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• <br />L~ <br />~~ <br />The following pazameters were used for the sediment pond embankment Factor of Safety <br />calculations: <br />Slope Height <br />Slope Angle <br />Soil Density <br />Soil Cohesion <br />Internal Friction Angle <br />Factor of Safety (Dry) <br />Factor of Safety (Saturated) <br />11' <br />26.5° (2H:1 V) (Worst Case Scenazio) <br />1151bslft3 <br />120 psf <br />33° <br />3.24 <br />2.09 <br />The calculated Factor of Safety for the pond embankment is 3.24 for the dry conditions and <br />2.098 for the saturated conditions. This exceeds the 1.30 requirements of the regulations. <br />National King Coal, LLC <br />Krng Mine 77 <br />April 2006 <br />