Appendix K Table 4: Risk Assessment Event Controls (Mitigation/ Management Measures) Residual risk assessment Controls to reduce likelihood Controls to reduce severity of consequence Likelihood Consequence Risk Unplanned detonation in explosives store (surface or underground store) Adherence to WorkSafe requirements including the establishment of a certified Hazardous Substance Location prohibiting ignition sources and incompatible substances and ensuring the appropriate separation distances and fire protection systems are available. Strict security, access restriction and inventory monitoring for storage areas. Fire protection systems in place. Store location selected for internal separation distance to off-site properties. Explosive quantity in each store reduced and separated by IMD to minimise risk of inter-magazine propagation. Appropriate design, testing, certification and maintenance of the explosives storage magazines surface) or chambers (underground) per the requirements of the HSW-HS. Segregated storage area for explosive substances, away from other hazardous substances and buildings. Emergency Management Plan will be in place. Unlikely – explosives storage locations have high security, multiple ignition prevention and fire suppression systems in place Minor (surface) Insignificant (WUG) – see quantitative assessment in Section 7.3.2.1 of this report. Low Fire in the ANE store (surface or underground) Adherence to WorkSafe requirements including the establishment of a certified Hazardous Substance Location prohibiting ignition sources and incompatible substances. Strict security, access restriction and inventory monitoring for storage area. Fire protection systems in place. Emergency Management Plan will be in place. Segregated storage area for ANE, away from other hazardous substances and buildings. Store location selected for internal separation distance to off-site properties. Unlikely – ANE stores have restricted access and cannot accelerate fire without both an ignition source and combustible fuel. Minor – Storage areas are well separated from any sensitive off site receptors. Low
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