23 Tonkin & Taylor Ltd Hazardous Substances Technical Assessment – Waihi North Project - Storage and use of hazardous substances at Willows Road site and the Wharekirauponga Underground Mine Oceana Gold (New Zealand) Limited June 2022 Job No: 1015212.1000 vRev0 Substance State Hazard Class Pre-2021 Proposed maximum volume Storage Location Secondary containment minimum requirement (HSW-HS regulation ref) ANE Solid 5.1.1B 6.1E 6.4A 9.1D 40,800 kg Oxidiser storage area – SFA Containment capacity of 5,000 L or 50% of the total pooling potential (TPP), whichever is greatest. (r12.16): 20,400 L 34,000 kg Oxidiser storage area – WUG Containment capacity of 5,000 L or 50% of the TPP, whichever is greatest. (r12.16): 17,000 L Gasser Liquid 6.1D 6.4A 6.5B 6.6B 6.9B 8,000 L Gasser storage area – SFA Containment capacity of at least 25% TPP or 110% of the largest container whichever is greater:2,000 L 4,000 L Gasser storage area – WUG Containment capacity of at least 25% TPP or 110% of the largest container whichever is greater: 1,000 L Calcium carbonate (Lime) Solid 6.4A 70,000 kg Lime silo – SFA Not required for solids Oxygen Compressed gas 5.1.2A 60 m3 Workshop stores – SFA Not required for gases Acetylene Compressed gas 2.1.1A 20 m3 Workshop stores – SFA Not required for gases Oils, greases Liquid 6.1D 6.1E 6.3A 6.4A 6.5B 6.9B 9.1B 9.1C 8,000 L Workshop stores – SFA These will be provided containment for at least 25% TPP or 110% of the largest container whichever is greater: 2,000 L 1. In accordance with theHealth and Safety at Work (Reduced Secondary Containment for Certain Above Ground Stationary Tanks) Safe Work Instrument 2017
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