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page Two <br /> 7 January 2013 <br /> M12058MT <br /> Our analysis included an assessment of the theoretical <br /> stability of embankment slopes manufactured from the materials <br /> tested. The constructed embankment configuration is generally as <br /> follows: <br /> -- crest width, 10 feet, <br /> - embankment height, 9. 5 feet, <br /> - embankment inclination: 3 horizontal to 1 vertical, up and <br /> down stream slopes. <br /> These dimensions imitate the embankment configuration used to <br /> assess the theoretical calculated stability of the embankment <br /> slopes. The scenario that was assessed included: <br /> - full reservoir water level, <br /> - a somewhat homogenous embankment fill, <br /> - a saturated embankment, and <br /> - steady state seepage flow through the embankment below the <br /> phreatic surface within the embankment. <br /> The stability of any slope is dependent on many factors. Typi- <br /> cally the theoretical stability of a slope is analyzed by <br /> calculating the anticipated gravitational forces that tend to <br /> drive the mass of soil downhill and the anticipated internal <br /> strength of the soil along the expected plane of failure that <br /> will resist the downhill movements. If the driving forces are <br /> equal to or greater than the resisting forces then failure is <br /> imminent. We understand that the required minimum calculated <br /> theoretical factor of safety is 1. 3 for a normal pool with steady <br /> state seepage, saturated condition. A calculated factor of <br /> safety of 1. 0 or less indicates that slope movement is imminent <br /> or in process. <br /> Factors that have an adverse influence on slope stability can <br /> generally be classified as those that increase the stress <br /> (driving force) on the system or those that decrease the strength <br /> (resisting forces) of the soil. <br /> ?rutittbtrt nub Ikeizacittlas <br /> CONSULTING GEOTECHNICAL ENGINEERS AND <br /> MATERIAL TESTING <br /> Appendix 2.05.3(4)-6 Page 8 December 2018(TR-19) <br />