Supporting Technical Assessments

Impenetrable Impenetrable Impenetrable PSTEQ Zone F PSTEQ Zone A/I Fdtn UC Impenetrable Impenetrable PSTEQ Zone G PSTEQ Ash/CWRock/Resid.S PSTEQ Zone G PSTEQ SP Zone D2 PSTEQ SP Zone E PSTEQ SP Zone D2 PSTEQ SP Zone D3 PSTEQ SP Zone D3 PSTEQ SP Zone D2 PSTEQ SP Zone D2 PSTEQ SP Zone D3 PSTEQ SP Zone D3 PSTEQ SP Zone D2 PSTEQ SP Zone D2 PSTEQ SP Zone D3 PSTEQ Zone A/I Mine OB PSTEQ SP Zone D2 PSTEQ SP Zone D3 Impenetrable 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) Efective Cohesion (kPa) Efective Friction Angle(°) Strength Function Phi-B (°) Minimum Strength (kPa) Tau/Si gma Ratio Piezometric Line Ru Include Ruin PWP Impenetrable Bedrock (Impenetrable) 1 No PSTEQ Ash/CWRock/Resid.S SHANSEP 17 0 0.23 1 No PSTEQSPZoneD2 Shear/NormalFn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes PSTEQSPZoneD3 Mohr-Coulomb 19 8 15 0 1 0.4 Yes PSTEQSPZoneE SHANSEP 19 0 0.06 1 0.6 Yes PSTEQZoneA/IFdtn UC SHANSEP 17.5 50 28 1 0.3 Yes PSTEQZoneA/IMine OB SHANSEP 20.5 120 0.32 1 0.1 Yes PSTEQZoneF Shear/NormalFn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes PSTEQZoneG Undrained(Phi=0) 20.5 80 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 B23c North Slope PSTEQ 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) Effective Cohesion (kPa) Effective Friction Angle (°) Strength Function Minimum Strength (kPa) Tau/Sigma Ratio Piezometric Line Ru Include Ru in PWP Impenetrable Bedrock (Impenetrable) 1 No PSTEQ Ash/CWRock/Resid.S SHANSEP 17 0 0.23 1 No PSTEQ SP Zone D2 Shear/Normal Fn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes PSTEQ SP Zone D3 Mohr-Coulomb 19 8 15 1 0.4 Yes PSTEQ SP Zone E SHANSEP 19 0 0.06 1 0.6 Yes PSTEQ Zone A/I Fdtn UC SHANSEP 17.5 50 28 1 0.3 Yes PSTEQ Zone A/I Mine OB SHANSEP 20.5 120 0.32 1 0.1 Yes PSTEQ Zone F Shear/Normal Fn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes PSTEQ Zone G Undrained (Phi=0) 20.5 80 1 No

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