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• -� <br />CALCULATIONS <br />The following soil information was obtained from a representative soil sample sent to Trautner <br />Geotech in Durango, Colorado: <br />Internal Friction Angle (0) = 33° <br />Soil Cohesion (c) =120 pcf <br />Soil Density (Y) =115 pcf <br />• <br />• <br />Sediment Pond Factor of Safety Chart Calculations (Dry & Saturated Conditions) <br />Embankment Height (H) =11 feet <br />Slope Angle = 26.5° (2H:1 V) or 18.43° (3H:1 V) <br />Factor of Safety = F <br />Using the above information and using Circular Failure Chart Number 1 (Dry Conditions) the <br />value for c/YH Tan dD is calculated. Using this value you enter the chart and go to the <br />appropriate slope angle 26.5° or 18.43 °. From the y -axis the value of Tan OF is read. From this <br />value the Factor of Safety (F) is calculated. The same procedure is followed for the saturated <br />condition except Circular Failure Chart Number 5 is used, <br />Factor of Safety <br />Condition <br />c/YHTon(D <br />Tan (D/F 2:1 <br />Tondi/F 3:1 <br />F (2:1) <br />F (3:1) <br />Dr <br />.1461 <br />.28 <br />.20 <br />2.32 <br />3.24 <br />1 <br />Saturated <br />.1461 <br />.41 <br />.31 <br />1.58 <br />2.09 <br />Circular Failure Chart Number l (Dry Conditions) and Circular Failure Chart Number 5 <br />(Saturated Conditions) are shown on the next two pages. <br />National Ring Coal, LLG <br />Xing Mine H <br />April 2006 <br />