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Pond 011 embankment stability analysis for a Safety Factor 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 />the required 1.3 that is stated in 4.05.9(8)(b). <br />I, Ross L. Gubka, P.E., was on the construction site of Pond 011 the entire time as WFC's company <br />representative. I have a wide variety of experience in the design and construction of earth fill <br />embankment and impoundments. Nothing was observed during the 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 the sediment <br />pond is shown in Attachment 2.05.3(3)-20 and in Map 2.05.3(3)-17. <br />oss L. Gubka Date <br />Colorado Profe onal Engineer <br />Registration No. 28950 p0 REGIST <br />o?PtiEN11S G,` :F9 <br />U• • <br />;oc 2895x3 ? <br />~': <br />''~sri~in~ ••'~ <br />Attachment 2.05.3(3)-20-5 <br />