15 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 Substance State Hazard Classification Proposed maximum volume Storage location and description Pre-2021 Post-2021 LPG Gas 2.1.1A Flammable gas Category 1 80,000 L Two pressure vessels (40,000 L each), east of the Processing Plant central to OGNZLs landholding Workshop Maintenance oils and greases* Liquid 6.1D 6.1E 6.3A 6.4A 6.5B 6.9B 9.1B 9.1C Acute dermal toxicity Category 4 Aspiration hazard Category 1 Skin irritation Category 2 Serious eye damage Category 1 Skin sensitisation Category 1 Specific target organ toxicity – single or repeated exposure Category 2 Specific target organ toxicity – single exposure Category 3 narcotic effects Hazardous to the aquatic environment chronic Category 2 or 3 16,000 L Various units (tank, IBC or 205 L drum) located at the workshops: 8,000 L south of the processing plant and 8,000 L at the relocated workshop in the Development Site) Transformer oil Liquid 6.1E Aspiration hazard Category 1 8,640 L Oil is stored within the bunded transformer units: two 3,500 L transformers and one 1,740 L transformer. 1. Skin irritation Category 3 has not been adopted in the post-2021 classification system * Many of the maintenance substances are non-hazardous. The above table shows the highest individual hazard classes for the hazardous oils and greases. A list of substances which have hazard codes are listed inAppendix B.
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