14 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 Hazardous Substances and New Organisms (HSNO) Act and Regulations, which set minimum controls under the Environmental Protection Authority’s Hazardous Property Controls Notice 2017 (EPA Notice) to manage the hazards and risks related to all hazardous substances use within domestic environments and from ecotoxic substances in both workplaces and domestic settings; and Resource Management Act (RMA), under which District Councils are responsible for the control of actual or potential effects of the use, development, or protection of land. The Resource Legislation Amendment Act 2017 (RLAA) removed the explicit function of regional and territorial authorities under section 30 and 31 to control the adverse effects of the storage, use, disposal and transportation of hazardous substances to ensure that RMA controls do not duplicate controls in the HSNO Act and Health and Safety at Work Act. The controls under the HSNO Act and HSW Act provide the minimum protection standards for both onsite and offsite people and environments from the potential adverse effects. However, we note that the controls do not take into account the site-specific context such as the proximity to sensitive waterways or density of nearby residential developments. 4.2 Health and Safety at Work (Hazardous Substances) regulatory controls Control measures that are triggered under the Health and Safety at Work (Hazardous Substances) regulations (HSW-HS) by the volumes and types of hazardous substances proposed to be stored at the Willows Road portal site and within the WUG are summarised in Table 4.1 below. The operation is required to comply with all the listed requirements. These HSW-HS controls are specific to the types of hazard presented by the substances and are implemented to protect people on site from harm. The measures to reduce the likelihood or consequence of an incident to on-site workers will also reduce the risks to off-site people. The controls specified for Class 9 ecotoxic substances duplicate those specified under the EPA Notice which are intended to protect ecosystems when using and storing ecotoxic substances. Table 4.1: Summary and purpose of HSW-HS requirements Control measure Facility and substances Purpose of control Signage SFA Flammable, oxidising, corrosive, ecotoxic and explosive substances WUG Flammable, oxidising, ecotoxic and explosive substances Ensures-off site persons and emergency response personnel are able to identify the hazards at the site and take appropriate precautions. Secondary containment SFA Diesel, ANE, gasser, maintenance oils WUG Diesel, ANE and gasser Prevents release of a hazardous liquid to the environment in the event of a failure of primary containment (tank or package) and enables recovery of the substance for safe disposal. Fire extinguishers SFA Diesel, ANE, oxygen and Class 1 explosives WUG Enables swift emergency response to small fires in areas near hazardous substances to prevent ignition of flammable, explosive or oxidising substances.
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