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The printout for Case 1 is enclosed in this report. Cases 2 and 3 <br />greatly reduce the strength properties of the base material and <br />the dam fill. Case 3 shows that with extremely conservative base <br />and fill properties, the dam still has a safety factor of 1.55. <br />Conclusion <br />Due to the fact that the expected case (Case 1) results in a <br />safety factor above 6.0 and that extremely conservative values <br />for the base material and the dam fill still result in an <br />acceptable safety factor (Case 3), the dam is stable as <br />constructed. <br />I certify that the sediment pond at the Rimrock Mine has been <br />constructed according to the permitted design. Prudent state-of- <br />the-art engineering has been employed and the dam is sound, with <br />no current environmental threats or construction problems. <br />.~ <br />Date: p/.Z~IQ3 By: ~/~'-~e'!~s"'"~, <br />