49 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 9 Conclusions The key risks associated with the proposed storage and use of hazardous substances associated with the Willows Road tunnel portal site and underground in the WUG include: The risk to people and property from a fire or detonation at the explosives magazines, ANE storage area, gas storage at the SFA workshop or diesel tanks; The risk to ecosystems from a spill of diesel during tank filling or equipment refuelling; and The risk to ecosystems from a spill of packaged goods during unloading to site. The risks to people and property from an unintended detonation at the proposed explosives storage locations is assessed as low and will be managed through site and equipment design (e.g. separation distances to offsite locations and other explosives stores, provision of fire protection systems and certification of the explosives storage magazines) and management controls (personnel access restrictions, security monitoring, staff training and handler certification, and emergency response plans). The surrounding areas at the surface at Willows Road and in the Coromandel Forest Park above the WUG are considered sensitive to the effects of an unintended detonation. However, taking into account the proposed controls and distance to sensitive land uses the effects on offsite people and property from the proposed hazardous substances storage has been assessed as less than minor. The risks to people, property and the environment from a fire at the surface facilities area of the Willows Road site is low and managed through site and equipment design (e.g. separation of incompatible substances, combustible material and ignition sources and provision of fire fighting facilities) staff training, and emergency response plans. The proposed hazardous substances storage locations are isolated from public access. The environment is considered sensitive to the effects of a spill of diesel or spill of packaged goods. The risk to the environment will be managed through the site design (e.g. proposed spill containment measures including double skinned tanks, sealed refuelling areas, bunded storage areas and provision of water treatment for runoff arising from areas where these substances are stored or used) and operational procedures (e.g. spill response plan, unloading and safe handling procedures). Taking into account these controls, the effects on the environment from the use and storage of hazardous substances have been assessed as less than minor and consistent with the HDP objectives and policies for hazardous substances.
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