Supporting Technical Assessments

Impenetrable Impenetrable Impenetrable Drnd Zone F Drnd Zone A/I Fdtn UC Impenetrable Drnd Ash/CWRock/Resid.S Drnd Zone G Drnd Ash/CWRock/Resid.S Drnd Zone G Drnd SP Zone D2 Drnd SP Zone E Drnd SP Zone D2 Drnd SP Zone D3 Drnd SP Zone D3 Drnd SP Zone D2 Drnd SP Zone D2 Drnd SP Zone D3 Drnd SP Zone D3 Drnd SP Zone D2 Drnd SP Zone D2 Drnd SP Zone D3 Drnd Zone A/I Mine OB Drnd SP Zone D2 Drnd SP Zone D3 Drnd SP Zone D2 Impenetrable Distance 200 300 400 500 600 700 800 900 Elevation 30 50 70 90 110 130 150 170 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 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 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 42.395 m 146.3 m 11.3 m 20.528 m 54.316 m 47.043 m 13/10/2021 Section 2a.gsz Figure B21b North 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.: 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 SP Zone D2 Shear/Normal Fn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Drnd SP Zone D3 Mohr-Coulomb 19 5 31 1 0.4 Yes Drnd SP Zone E Mohr-Coulomb 19 0 26 1 0.6 Yes 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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