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Tailings Pond No• • <br />Sunnyside Mine <br />' Silverton, Colorado <br />Project No. 3120K114 <br />' o Intensity of study <br />o Certainty of the design loading condition occuring <br />1 <br />Depending on how well the above factors can be assessed <br />' determines what minimum factor of safety would be required to <br />have a reasonable degree of confidence that a failure will not <br />occur. It is the responsibility of the geotechnical engineer <br />to assess those conditions and provide advice as to a minimum <br />acceptable factor of safety. <br />A minimum factor of safety of at least 1.5 is generally the <br />' minimum assigned to man-made slopes analyzed under static <br />conditions. A minimum factor of safety of 1.0 is typically <br />' used under pseudo-static conditions. <br />Based on the results of our analyses, the factor of safety for <br />existing slopes do not meet recommended criteria for static <br />conditions, However, the minimum factors of safety for both <br />static and psuedo-static cases can be met when constructing the <br />2:1 slopes planned for the reclamation process. <br />' RECOMMENDATIONS <br />Reclamation of the tailings pond will consist of excavating <br />' materials from the face of the slope with placement at the top <br />of the existing embankment. To maintain stability during the <br />reclamation process, the type and method of construction <br />' operation is considered the most critical. Long-term :stability <br />will be effected by the control of water entering the tailings <br />' pond and materials, and the placement of any excess tailings on <br />top of the existing embankment. <br />' -9- <br />1 <br />