EGL Ref: 8983 23 June 2022 Page 30 WAI-985-000-REP-LC-0004_Rev0.docx This report shall only be read in its entirety. Failure Mode Initiating hazard Potential Failure Mechanism Design Mitigation Dam Safety Monitoring with regular monitoring to identify the development of excessive shear strain. FM6 Seismic Liquefaction (cyclic softening) or settlement of weak soils in the foundations leading to slumping and instability Positioning of embankment to optimize stability at the toe of downstream embankment. Undercutting of sensitive soils in the Paleo Gully and backfilling with structural fill. (Shear) key cuts into bedrock. Visual inspections and monitoring of embankment deformation. FM7 Heavy rainfall Failure of northern slopes into Storage 3 impoundment causing wave which over tops the crest. Assess the conditions for landslips and consider inundation scenarios in relation to impoundment. After very heavy rainfall (1 in 10 year event) undertake inspection of slopes above facility for potential slope instability to identify any new potential instabilities risks.
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