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Conclusion <br />The size of Sediment Pond 013 was enlarged over the design to allow for additional sediment <br />storage so clean out frequency could be expanded upon. SEDCAD4 program was utilized in the <br />design to size the pond and to determine the size, location and placement of the gate valves, <br />Primary and Emergency Spillway Pipes. The SEDCAD4 10 & 25yr-24hr models can be viewed <br />within this document. SEDCAD4 shows that neither the 10yr or 25yr even reaches the top of the <br />Primary Riser. <br />Pond 013 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 013 the entire time as WFC's <br />company representative. I have a wide variety of experience in the design and construction of <br />earth fill 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)-21 and in Map 2.05.3(3)-18. <br />~L~ <br />Ross L. Gub Date <br />Colorado Professional Engineer <br />Registration No. 28950 <br />PP~p RE~~S'r <br />o°~~~wIS~Gm~o <br />U.r~ tee: <br />Attachment 2.05.3(3)-21-6 <br />