Supporting Technical Assessments

Impenetrable Impenetrable Impenetrable Udrnd Zone F Udrnd Zone A/I Fdtn UC Impenetrable Udrnd Ash/CWRock/Resid.S Udrnd Zone G Udrnd Ash/CWRock/Resid.S Udrnd Zone G Udrnd SP Zone D2 Udrnd SP Zone E Udrnd SP Zone D2 Udrnd SP Zone D3 Udrnd SP Zone D3 Udrnd SP Zone D2 Udrnd SP Zone D2 Udrnd SP Zone D3 Udrnd SP Zone D3 Udrnd SP Zone D2 Udrnd SP Zone D2 Udrnd SP Zone D3 Udrnd Zone A/I Mine OB Udrnd SP Zone D2 Udrnd SP Zone D3 Udrnd 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) Cohesion (kPa) Minimum Strength (kPa) Tau/Sigma Ratio Efective Cohesion (kPa) Efective Friction Angle(°) Strength Function Phi-B (°) Piezometric Line Ru Include Ruin PWP Impenetrable Bedrock (Impenetrable) 1 No Udrnd Ash/CWRock/Resid.S Shear/NormalFn. 17 Ash/CWRock 0 1 0.1 Yes UdrndSPZoneD2 Shear/NormalFn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes UdrndSPZoneD3 Mohr-Coulomb 19 10 18 0 1 0.4 Yes UdrndSPZoneE SHANSEP 19 0 0.21 1 0.6 Yes UdrndZoneA/I Fdtn UC SHANSEP 17.5 80 0.35 1 0.3 Yes UdrndZoneA/IMine OB SHANSEP 20.5 150 0.4 1 0.1 Yes UdrndZoneF Shear/NormalFn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes UdrndZoneG Undrained(Phi=0) 20.5 100 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 B22b North Slope Udrnd 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) Cohesion (kPa) Minimum Strength (kPa) Tau/Sigma Ratio Effective Cohesion (kPa) Effective Friction Angle (°) Strength Function Piezometric Line Ru Include Ru in PWP Impenetrable Bedrock (Impenetrable) 1 No Udrnd Ash/CWRock/Resid.S Shear/Normal Fn. 17 Ash/CWRock 1 0.1 Yes Udrnd SP Zone D2 Shear/Normal Fn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Udrnd SP Zone D3 Mohr-Coulomb 19 10 18 1 0.4 Yes Udrnd SP Zone E SHANSEP 19 0 0.21 1 0.6 Yes Udrnd Zone A/I Fdtn UC SHANSEP 17.5 80 0.35 1 0.3 Yes Udrnd Zone A/I Mine OB SHANSEP 20.5 150 0.4 1 0.1 Yes Udrnd Zone F Shear/Normal Fn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Udrnd Zone G Undrained (Phi=0) 20.5 100 1 No

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