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<br /> <br />-z- <br />embankment height of 35 feet was analyzed. Parametric studies of the effect <br />of strength on stability was conducted using angles of internal friction of <br />250, 300, 350, and 420. These results illustrated on Fig. 4 indicate a lower <br />bound Factor of Safety of 1.9 for a 9 angle of 250. Using 0 equal 420 and <br />no cohesion, the Factor of Safety ranged from 3.6 to 3.9 depending upon the <br />analysis method used. <br />Based upon the laboratory and analysis results, it appears the design and <br />construction recommendations provided in our original report (Job No. 5843) <br />will result in a stable structure. The analyses indicate a minimum Factor <br />of Safety of 1.9 which exceeds the regulatory requirement of 1.5. <br />If you have any questions concerning this information or require additional <br />analysis, please contact our office. <br />Very truly yours, <br />CTL/THOMPSON, INC. <br />BY ,P,l.~./~ /,l ~~ - - <br />Robert U. Branson, Project Engineer . <br />Reviewed by: ~ ~ M. <br />)~ 4Q:• O~~T~A~ <br />~: !~ <br />ompson, .E. 3 7078 <br /> <br />RUB:RWT:kt <br />(20 copies sent) <br />