34 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 4.11.4 Hydrocarbon delivery, storage and use The site operates under a Hydrocarbon Management Plan14 which outlines the risks, legal requirements, storage locations, handling procedures, effluent treatment, waste collection, spill management, monitoring and measurement and training for the mines rescue team. Above ground bulk storage facilities for diesel are designed, installed and maintained by BP Oil New Zealand Limited (BP). All tanks are provided with secondary containment, either integral (double skinned) or a bund with capacity for 110% of the tank volume. Smaller relocatable diesel tanks are proposed to be installed where required for refuelling equipment such as in the WUG portal. The StatSat models have been selected as indicative models for these small refuelling units, which include features like thermally and manually activated fire enclosures with dry chemical fire suppression, 110% spill containment around the tank and pumps and automatic shut off valves. The management plan provides a diesel handling procedure which requires supervision at all times during refuelling activities. Dispensing pumps are installed with automatic shut-off valves to reduce spills and overfilling. API oil water separators are installed in the diesel refuelling concrete drainage pads within the mining operations and at the workshops to treat any residual contamination in the refuelling areas. Bulk oil storage tanks are located next to each workshop and appropriately labelled as various oils are stored in the workshop area. A separate oil tank is available for waste oil. The oils are stored within bunded areas. The LPG tanks are certificated under a location compliance certificate, which confirms that the tanks meet requirements on their design, construction, installation and emergency management procedures. 4.11.5 WTP chemical delivery, storage and use of hazardous substances Ferric chloride, hydrogen peroxide and hydrated lime all have delivery management plans15 to minimise the risk of incidents during unloading to the WTP. The delivery management plans outline the safety precautions, PPE and procedure for undertaking delivery. Delivery of these substances involves alerting Mill Control of the specific substance and receiving area for delivery. Under the WEMP, security is the first point of contact in the event of an emergency response plan including spill or accidental release. The delivery driver must call prior to leaving the depot and provide an estimated time of arrival at the site. Upon arrival, delivery tankers of ferric chloride and hydrogen peroxide must be parked within the confines of the concrete pad next to the WTP, which is fitted with a sump to capture any accidental spills during delivery. Tanks must not be filled higher than 90% capacity. For the two hydrogen peroxide tanks, the average across both tanks to accept delivery must be at 35% capacity. The ferric chloride procedure also provides instruction for acceptable tank levels and rejection of delivery if the space does not allow safe filling of the bulk storage tanks. The procedures ensure no overfilling of tanks and reduces potential for accidental spills. 14 OGNZL, May 2020, Hydrocarbon Management Plan, WAI-200-PLN-005 15 OGNZL, September 2019, Hydrogen Peroxide Product Delivery, WAI- 458-PRO-001 OGNZL, September 2019, Ferric Chloride Product Delivery, WAI-458-PRO-004 OGNZL, September 2019, Water Treatment Plant Lime Product Delivery, WAI- 458-PRO-005
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