Event Controls (Mitigation/ Management Measures) Residual risk assessment Controls to reduce likelihood Controls to reduce severity of consequence Likelihood Consequence Risk Fire in the diesel or LPG tank areas Design, testing, inspection, certification and maintenance of the tanks, pumps and systems in accordance with standards set out in the HSW-HS. Prohibition of ignition sources and incompatible substances at the storage areas. Appropriate separation distances to other buildings, hazardous substances or sensitive locations. Fire protection systems provided, drills held regularly. Emergency Management Plan will be in place, including fire fighting provisions and evacuation plans. Unlikely – tank areas prohibit ignition sources. Minor – storage areas provided large separation to sensitive receptors, limited damage to on site property Low Diesel tank leak or rupture at storage locations and release to the environment Design, testing, inspection, certification and maintenance of the storage systems in accordance with standards set out in the HSW-HS and preventative maintenance will minimise the risk of leakage of hazardous substances. Storage in double skinned tanks. Emergency Management Plan will be in place, including provision of spill kits and staff trained in spill response, and evacuation plans. Areas where diesel is stored drain to oil water separators to remove any residual hydrocarbons in stormwater. Unlikely – multiple failures of structural controls required to result in discharge to the environment. Minor – any release contained in secondary containment or waste systems on site. Low Valve or connection failure for the liquid cyanide systems and release to the environment Process control systems are automated with interlock systems in place. Automatic dosing system to reduce human interaction with the substance and automated re-ordering systems to prevent overfilling. Design, testing, inspection, certification of storage systems in accordance with standards set out in the HSW-HS and preventative maintenance will minimise the risk of leakage of hazardous substances. Secondary and tertiary containment provided for the processing plant and WTP areas to contain any spills on site. Emergency response plans prepared for the event of accidental release. Staff training in task specific procedures, regular task audits and cyanide awareness training. Unlikely – multiple failures of structural controls including secondary and tertiary containment required to result in discharge to the environment. Minor – any release contained in secondary containment or waste systems on site. Low
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