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Pond 011 embankment stability analysis for a Safety hector was performed using the SB -Slope <br />stability software. A factor of safety in excess of 3 to 1 was calculated for the As -Built Well above <br />tho required 1.3 that 6- stated in 4A5.9(By(by, <br />1. Ross L. Gubka. P.E., was on the construction site of Pond 011 the entire time as WFC's Company <br />representative. 1 have a wide variety of expericnco In the design and construction of earth fill <br />embankment and Impoundments. Nothing was observed during tlnti Inspections that would <br />indicated the pond has a potential for failure. The sediment pond was constructed in accordance <br />with the applicable regulations during October and November 2007. The design of Ute sediment <br />pond is shown in Attachment 2.05.3(3) -20 and in Map 2.05.3(3) -17. <br />I+,kf &N L. 0 B <br />A ka Date <br />Ccolnrado Profe anal Enginoor <br />Registration No. 28950 <br />Attach meat 2.05.3(3) -20 -5 <br />Attachment 2.05.3(3) -20 -5 <br />