EGL Ref: 8983 8 October 2021 Page 3 TABLE B4: STATIC CONDITION – UNDRAINED STRENGTH PARAMETER SET Material (kN/m3) Strength Parameters Porewater Pressure Operational Closure Zone A/I Fill – Sourced from mine overburden of foundation rock undercut 20.5 Sumin = 150 kPa, Su/σv’ = 0.4 ru = 0.1 Phreatic^ Zone A/I Fill – Sourced from foundation undercut ash and alluvium 17.5 Sumin = 80 kPa, Su/σv’ = 0.35 ru = 0.3 Phreatic^ Zone A Fill – Reworked in-situ Ash/Surface CW Rhyolite 17.0 Vert. eff. Stress (kPa) Su (kPa) Su/σv’ ru = 0.3 Phreatic^ 0 0 - 100 46 0.46 300 103 0.34 600 189 0.32 1000 288 0.29 2000 460 0.23 Zone B Fill Below RL145 20.5 c = 10 kPa = 18 deg ru = 0.5 Phreatic* Zone B Fill Above RL145 20.5 c = 21 kPa = 21 deg Phreatic* Phreatic* Zone C2, F Fill 20.5 Duncan Gravel/Cobbles with Cu > 4 16%ile ru = 0.05 Phreatic^ Zone C1 Fill 20.5 c = 21 kPa = 21 deg ru = 0.1 Phreatic^ Zone D2 Fill 19.5 c’ = 5 kPa ’ = 35 deg ru = 0.1 Phreatic^ Zone D3 19.0 c = 10 kPa = 18 deg ru = 0.4 Phreatic^ Zone E 19.0 Su/σv’ = 0.21 ru = 0.6 Phreatic^ Tails Capping Layer 20.5 c’ = 3 kPa ’ = 31 deg Phreatic^ Phreatic^ Zone G Fill 20.5 Su = 100 kPa - - PG Fill 20.5 Duncan Gravel/Cobbles with Cu > 4 16%ile ru = 0.05 Phreatic^ Sensitive Redeposited Rhyolite Tuff Typical SPTN = 0 to 1 16.5 Su/σv’ = 0.21 Phreatic^ plus ru = 0.1 Phreatic^ CW Rhyolite/Residual Soil UCS <0.5MPa SPTN <8 17.0 Vert. eff. Stress (kPa) Su (kPa) Su/σv’ Phreatic^ plus ru = 0.1 Phreatic^ 0 0 - 100 46 0.46 300 103 0.34 600 189 0.32 1000 288 0.29 2000 460 0.23 HW to MW Rhyolite Rock Extremely Weak to Very Weak Rhyolite Rock UCS 0.5MPa to 20MPa 17.5 c’ = 5 kPa ’ = 35 deg Phreatic^ Phreatic^ Weak Rhyolite Rock 18.5 Hoek – W Rhyolite Phreatic^ Phreatic^ Fresh Tailings 16.0 Su/σv’ = 0.04 *Phreatic *Phreatic Consolidated Tailings 18.0 Su/σv’ = 0.13 *Phreatic *Phreatic *Supernatant pond water phreatic surface with a hydrostatic profile ^Embankment/foundation phreatic surface applied with a hydrostatic profile
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