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Woodward-Clyde <br />Con.~sultants <br />~~ <br />same as described above. Within the slope the phreatic surface location was varied to <br />establish a relationship between the depth to the phreatic surface and the resubting factor <br />of safety. <br />33 ANALYSIS OF EXISTING FIGHT EMBANKMENT <br />Results of slope stability calculations for the existing height embankment at the: February <br />1992 water levels at Study Section 7-7' are s»*++ma~~Pd on Figure 2. The shear surface <br />with the lowest factor of safety is located neaz the toe of the embankment zmd passes <br />primarily through the starter dam. The factor of safety corresponding to this surface <br />is 2.39. <br />Resulu of slope stability calculations for the existing height embanlmtent at the: February <br />1992 water levels at Study Section 8-8' aze summarized on Figure 3. The sheaz surface <br />with the lowest factor of safety is located neaz the toe of the embanlonent and passes <br />through the lower portion of the tailing embankment and through the foundation below <br />the starter dam. The factor of safety corresponding to this surface is 2.61. <br />Results of slope stability calculations for the existing height embankment at the February <br />1992 water levels at Study Section 9-9' aze summarized on Figure 4. The she:az surface <br />with the lowest factor of safety passes relatively deeply through the full height of the <br />embankment and through the foundation below the starter dam. The factor of safety <br />corresponding to this surface is 2.70. <br />Resulu of slope stability calculations for the existing height embankment at the February <br />1992 water levels at Study Section 10-10' are summarized on Figure 5. The sheaz <br />_ surface with the lowest factor of safety passes relatively deeply through the full height <br />of the embank®ent and through the foundation below the starter dam. Tho factor of <br />safety corresponding to this surface is 2.97. <br />~_ <br />Resulu of slope stability calculations for the existing height embanlmzent at the February <br />1992 water levels at Study Section i1-11' are summarized on Figure 6. This study <br />section is located toward the left abutment of the dam as shown on Figure I and does <br />not intercept the starter dam. The shcaz surface with the lowest factor of safety passes <br />ns9ua» ao-m-svarr 3-3 <br />