EGL Ref: 8983 8 October 2021 Page 4 TABLE B5: EARTHQUAKE CONDITION - POST SEISMIC & CO-SEISMIC 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 = 120 kPa, Su/σv’ = 0.32 ru = 0.1 Phreatic^ Zone A/I Fill – Sourced from foundation undercut ash and alluvium 17.5 Sumin = 50 kPa, Su/σv’ = 0.28 ru = 0.3 Phreatic^ Zone A Fill – Reworked in-situ Ash/Surface CW Rhyolite 17.0 Su/σv’ = 0.23 ru = 0.3 Phreatic^ Zone B Fill Below RL145 20.5 c = 8 kPa = 15 deg ru = 0.5 Phreatic* Zone B Fill Above RL145 20.5 c = 17 kPa = 17 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 = 17 kPa = 17 deg ru = 0.1 Phreatic^ Zone D2 Fill 19.5 c’ = 5 kPa ’ = 35 deg ru = 0.1 Phreatic^ Zone D3 19.0 c = 8 kPa = 15 deg ru = 0.4 Phreatic^ Zone E 19.0 Su/σv’ = 0.06 ru = 0.6 Phreatic^ Tails Capping Layer 20.5 c’ = 2.4 kPa ’ = 26 deg Phreatic^ Phreatic^ Zone G Fill 20.5 Su = 80 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’ = 0.15 (20% strain) Su/σv’ = 0.06 (100% strain) Phreatic^ plus ru = 0.1 Phreatic^ Ash/ CW Rhyolite/Residual Soil UCS <0.5MPa SPTN <8 17.0 Su/σv’ = 0.23 Phreatic^ plus ru = 0.1 Phreatic^ HW to MW Rock Extremely Weak to Very Weak Rhyolite Rock UCS 0.5MPa to 5MPa 17.5 c’ = 5 kPa ’ = 35 deg Phreatic^ Phreatic^ Weak Rhyolite Rock UCS > 5MPa 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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