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Table 4 - Factor of Safety for RPEE Waste Rock Pile <br />Top of Refuse <br />Elevation ft <br />Static Factor of Safety, <br />ESSA' (Reg'd2 FS=1.5) <br />Seismic Factor of <br />Safety ESSA, (Req'd3 <br />FS=1.0 <br />2D <br />3D <br />2D <br />3D <br />6,754 <br />1.33 <br />1.73 <br />1.08 <br />1.41 <br />6,824 <br />1.27 <br />1.65 <br />1.03 <br />1.34 <br />6,920 <br />1.27 <br />1.65 <br />1.03 <br />1.34 <br />6,958 <br />1.26 <br />1.63 <br />1.03 <br />1.34 <br />7,007 <br />1.27 <br />1.65 <br />1.03 <br />1.33 <br />7,050 <br />1.26 <br />1.64 <br />1.02 <br />1.33 <br />7,106 <br />1.26 <br />1.63 <br />1.02 <br />1.32 <br />7,212 <br />1.21 <br />1.57 <br />1.00 <br />1.30 <br />7,301 <br />1.19 <br />1.55 <br />1.00 <br />1.30 <br />7,440 <br />1 1.18 <br />1.54 <br />1 1.00 <br />1 1.30 <br />Notes <br />1. ESSA: Effective Stress Stability Analysis (long-term conditions) <br />2. CDRMS required minimum factor of safety, Rule 4.09.1(7) and Rule 4.10.4(2) <br />3. CDRMS Rules do not establish a minimum factor of safety for coal waste rock embankments. <br />The Rules require a minimum factor of safety of 1.2 for impoundments. A minimum factor of <br />safety of 1.0 is generally acceptable in geotechnical design for seismic conditions for slopes that <br />are not associated with impundments. Applied horizontal seismic acceleration is 0.0698g <br />