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<br /> <br />(i.e. a common slice and slip circle method), This method utilizes principles <br />' of static analysis where certain conditions must be assumed so that: an idealized <br />' system can be created for model simulatt9on. The primary assumptions in <br />this analysis are that the materials composing the embankment are isotropi <br />and homogeneous in each unitized stratum. <br />The cross sections analyzed were taken from the topographic maps suppl_~ed <br />' by the Standard Metals Corporation from the subject site w h he addition <br />' of earthen berm material as located by the personnel .from this office on <br />the site. Cross sections as detailed on Figures 3 and 4 were analyzed <br />' , against failure, at the locations shown on the Test Hole Location Plan <br />Figure 1. <br />' Several different assumptions were incorporated into the analysis <br />by varying certain physical properties of the soils on the site and the <br />position of the existing water table. For purposes of this analysis it <br />' was assumed that the tailings embankment was constructed by using the upstream <br />method of tailings placement and that the percentage of sand to slime tailings <br />' was approximately 60 to 40; however, the exact interface results from a <br />gradational change of the material in the field. In addition, from oar <br />understanding of the construction of the berm at the front of the tailing <br />' pond, a toe drain has been installed beneath the berm material to drain <br />fluid from the sand tailings. Position of the existing water table o-~as <br />taken at the sand-slime interface, and at the sand-original ground interface <br />for the analysis. Where no slime tailings were encountered in the test <br />holes, the sand-slime interface was positioned from the volume estimate <br />' of the materials encountered. <br /> <br />' - 5- <br />