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Table 2 — Geotechnical Model Results <br />Case <br />Colluvium Strength <br />Condition <br />Design Slope (Includes Benches) <br />2D <br />3D <br />ESSA1 (Fully- <br />softened 3 <br />' =24.9 deg., c' =330 psf <br />Static <br />1.67 <br />2.06 <br />Pseudo - Statics <br />1.36 <br />-- <br />ESSA1 <br />Residual 4 <br />' =22 deg., c' =0 psf <br />Static <br />1.38 <br />1.90 <br />Pseudo - Statics <br />1.13 <br />-- <br />USSA2 <br />cu =14.8 deg., c =487 psf <br />Static <br />1.08 <br />1.47 <br />Pseudo - Statics <br />086 <br />-- <br />Notes <br />1 ESSA. Effective Stress Stability Analysis (long -term conditions) <br />2 USSA Undrained Strength Stability Analysis (short-term, end -of- construction conditions) <br />3 The fully- softened shear strength is a peak drained strength envelope that simulates the swelling and softening of a medium stiff or stiffer, fissured <br />clay <br />4 The residual shear strength is a large- strain drained strength envelope that applies to previously sheared clays <br />5 Applied horizontal seismic acceleration is 0 0698g <br />revised July 21, 2011 <br />