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TABLE 4 <br /> MARTIN MARIETTA MATERIALS <br /> DUCKWORTH MINE SLOPE LINER <br /> SUMMARY OF STABILITY ANALYSIS'RESULTS AND STRENGTH PARAMETERS USED <br /> STABILITY ANALYSES <br /> Calculated Factor of Acceptable Minimum <br /> Scenario Safety2 Required <br /> Factor of Safety <br /> Full Reservoir 2.4 1.5 <br /> Rapid Drawdown 1.2 1.2 <br /> Seismic3 1.4 1.0 <br /> Completed Sloe Liner Construction 1 1.8 1 1.2 <br /> NOTES: <br /> 1. Stability analysis performed with SlopeM 8.02 computer program. <br /> 2. Factor of safety using the Spencer limit equilibrium method. <br /> 3. Seismic analysis utilized horizontal ground acceleration of 0.1 g. <br /> STRENGTH PARAMETERS <br /> Soil Unit Dry Unit Weight Moist Unit Weight Saturated Unit Weight Cohesion c' Friction Angle 0' <br /> ( CO ( c ( cf) ( so (degrees) <br /> Zone 1 a Core Fill 110 118 122 100 26 <br /> Zone 1 b Outer Fill 110 118 122 50 30 <br /> Overburden 103 114 122 0 30 <br /> Sand and Gravel 119 122 125 0 38 <br /> Siltstone Bedrock 114 117 120 250 30 <br /> P:\24097\133-24097-14003\Docs\Reports\Design Memorandum\Table 4.doc <br />