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The existing decant system that extends under the tailing embankment consists of <br />two concrete-encased steel pipelines. One of the pipelines serves as the intake to the Ute <br />Park pumps. The second pipeline serves as the emergency spillway for the impoundment in <br />the event of dangerously high water levels in the water pool. For dam safety reasons <br />associated with conduits through tailing dams, it is the intent of Climax to abandon and plug <br />the decant and spillway pipelines. Recirculation of process water back up to the mill would <br />then be accomplished using the proposed barge pumping system. The flood control impacts <br />of eliminating the pond spillway will be addressed in this report. The design of the decant <br />abandonment was performed by URS Corporation and is described in their January 2001 <br />geotechnical report prepared for the Millwater Barge Project. <br />The PMP design storm that was used in this analysis was developed from a site - <br />specific hydro - meteorological evaluation performed by Applied Weather Associates (AWA). <br />A copy of the AWA report is included herein as Appendix A. <br />Also in support of this analysis, URS Corporation has performed an analysis of the <br />effects of high water levels in the tailing pond on the stability of the tailings dam. A copy of <br />the URS report is included herein as Appendix B. <br />2 <br />