Supporting Technical Assessments

2.25 Distance 0 100 200 300 400 500 600 700 800 900 1,000 Elevation 30 50 70 90 110 130 150 170 190 Color Name Model Unit Weight (kN/m³) Strength Function Efective Cohesion (kPa) Efective Friction Angle(°) Phi-B (°) Piezometric Line Ru Include Ruin PWP Drnd Ash/CWRock/Resid.S Mohr-Coulomb 17 0 26 0 1 0.1 Yes DrndEW/VWRhy. EWIgn&Dac. Shear/NormalFn. 17.5 EW/VW Rhy. EWIgn. Dac. 0 1 0.1 Yes DrndPaleoBldrAlu. Mohr-Coulomb 18 5 35 0 1 No DrndSPZoneD2 Shear/NormalFn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes DrndSPZoneD3 Mohr-Coulomb 19 5 31 0 1 0.4 Yes DrndSPZoneE Mohr-Coulomb 19 0 26 0 1 0.6 Yes DrndVWIgn. Shear/NormalFn. 19 VWIgn. 0 1 No DrndZoneA/ IFdt nUC Mohr-Coulomb 17.5 3 31 0 1 0.3 Yes DrndZoneA/ IMine OB Mohr-Coulomb 20.5 5 35 0 1 0.1 Yes DrndZoneF Shear/NormalFn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes DrndZoneG Mohr-Coulomb 20.5 3 31 0 1 0.1 Yes Impenetrable Bedrock(Impenetrable) 1 No 20.482 m 20.372 m 50.237 m 59.03 m 136.7 m 9.8897 m Factor of Safety 2.25 - 2.35 2.35 - 2.45 ≥ 2.45 13/10/2021 Section 1d.gsz Figure B11b West Slope Drnd 1:4,000 By: ET Analysis Settings Method: Morgenstern-Price Direction of movement: Left to Right Slip Surface Option: Entry and Exit Unit Weight of Water: 9.807 kN/m³ Horz Seismic Coef.: Factor of Safety: 2.25 Color Name Model Unit Weight (kN/m³) Strength Function Effective Cohesion (kPa) Effective Friction Angle (°) Piezometric Line Ru Include Ru in PWP Drnd Ash/CWRock/Resid.S Mohr-Coulomb 17 0 26 1 0.1 Yes Drnd EW/VW Rhy. EW Ign&Dac. Shear/Normal Fn. 17.5 EW/VW Rhy. EW Ign. Dac. 1 0.1 Yes Drnd Paleo Bldr Allu. Mohr-Coulomb 18 5 35 1 No Drnd SPZone D2 Shear/Normal Fn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Drnd SPZone D3 Mohr-Coulomb 19 5 31 1 0.4 Yes Drnd SPZone E Mohr-Coulomb 19 0 26 1 0.6 Yes Drnd VW Ign. Shear/Normal Fn. 19 VW Ign. 1 No Drnd Zone A/I Fdtn UC Mohr-Coulomb 17.5 3 31 1 0.3 Yes Drnd Zone A/I Mine OB Mohr-Coulomb 20.5 5 35 1 0.1 Yes Drnd Zone F Shear/Normal Fn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Drnd Zone G Mohr-Coulomb 20.5 3 31 1 0.1 Yes Impenetrable Bedrock (Impenetrable) 1 No

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