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M Idli H <br />MONTGOMEHYWATSONHARZ4 <br />B J.Pellfcer Date 1-Jun-06 Client Seneca Sheet 2 012 <br />hkd. B C.Tusin Descd Gon Seneca IIW Slo a Failure Back Anal sis and Re rode 16.1un-2006 06 9 iooa337 <br />- Surface water that drains to the low spot in the regraded area will be directed to a corrugated <br />pipe half round that will be placed on the slope. This half round will transmit water off the <br />while minimizing infiltration into the slope which could be destabilizing, <br />- Assuming saturated slope conditions which is conservative, a slope regraded to 3H:1 V will have <br />static safety factor of 1.72 which is substantially higher than the 1.30 factor of safety required t <br />the State of Colorado. See Attachment 2. <br />Rock Slope Analysis: <br />A As previously stated, Roclab softwaze was used to estimate the intact sheaz strength for the rock <br />slopes. <br />- Based on mapping in the area, the overall natural slope height is 200 feet. <br />- The slope angle is 34°. <br />- The slope was assumed to be nearly fully saturated which is conservative. See Attachment 4. <br />- A safety factor of 2.20 was calculated for the conditions presented. This safety exceeds the <br />required safety factor of 1.30. See Attachment 4. <br />Conclusion: <br />The existing rock slopes that stand at 34° aze stable in their current configuration. The unconsolidate <br />spoil located on the upper portions of the slope will be regraded to a 3H:1V configuration which will <br />provide a static safety factor of 1.72. <br />