37 Tonkin & Taylor Ltd Hazardous Substances Technical Assessment – Waihi North Project - Waihi Processing Plant, Water Treatment Plant and Development Site Oceana Gold (New Zealand) Limited June 2022 Job No: 1015212.1000 vRev0 4.13 Transformer oil management The proposed new substation north of the Processing Plant will utilise mineral oil within the three transformers. These transformers are proposed to each be bunded to provided containment capacity for 150% of the total contents of each transformer. The oil does not have a flammable hazard classification, but as an added precaution these facilities will be installed with firewalls to manage the risk of electrical fire. 4.14 Transport of hazardous substances The delivery of hazardous substances to OGNZL’s activities in Waihi will be primarily via State Highway 2, the main freight network between Tauranga and Auckland. The Waihi site is typically accessed via Baxter Road. Delivery frequencies and volumes for each substance is set out inTable 4.5 below, and shows that most substances used at the Processing Plant are delivered on a weekly to monthly basis, with some bulk substances like LPG being delivered on a 6-monthly basis. At peak demand deliveries to the Development Site of Class 1 explosives are expected on a weekly basis. Delivery volumes are typically much lower than the peak storage volumes assessed in this report. The HSMP provides that any transport of hazardous substances will also be in accordance with the Land Transport Rule: Dangerous Goods 2005. Furthermore, the substances will be handled in accordance with the label and SDS directions where applicable, this includes the following controls: Ensure appropriate paperwork is held by the driver. Ensure class placards are displayed when transporting dangerous goods. Ensure appropriate hazardous substance endorsements are held by the driver. Ensure appropriate license classes are held by the driver and the appropriate weight/class of vehicle is used in transport. OGNZL to undertake regular audits to ensure compliance with the above. Cyanide is transported from Australia (Gladstone) to New Zealand. Transport procedures are accordance with Dangerous Goods regulations for Australia, New Zealand and the United Nations. Table 4.5: Delivery schedule for substances proposed to be stored at the Processing plant, WTP and Development Site Substance Hazard Class Proposed maximum storage volume Delivery schedule Delivery volume High calcium hydrated lime 8.2C, 8.3A 9.1D 306,000 L Twice weekly 24,000 kg (solid dosed with water on site) High calcium quicklime 8.2C, 8.3A, 9.1D 70,000 kg Twice weekly 26,000 kg Caustic soda (Sodium hydroxide 50%) 6.1D ,6.1E, 8.1A, 8.2B, 8.3A, 9.1D. 24,000 L Monthly 10,000 L
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