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(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 simulation. The primary assumptions in <br /> this analysis are that the materials composing the embankment are isotropic <br /> and homogeneous in each unitized stratum. <br /> The cross sections analyzed were taken from the topographic maps supplied <br /> by the Standard Metals Corporation from the subject site, with the 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 our <br /> 0 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 was <br /> 0 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 /> A -5- <br />