21 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 Table 4.1: Summary and purpose of HSW-HS requirements Control measure Facility and substances Purpose of control Signage Processing Plant Flammable, oxidising, corrosive, toxic and ecotoxic substances WTP Oxidising, corrosive, toxic and ecotoxic substances Development Site Flammable liquid, flammable gas, Class 1 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 Processing Plant Hydrochloric acid, caustic soda, cyanide solution, diesel and maintenance oils WTP High calcium hydrated lime, ferric chloride, hydrogen peroxide. Development Site Maintenance oils and diesel 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 Processing Plant Diesel, oxygen WTP Hydrogen peroxide Development Site Class 1 explosives, LPG and diesel Enables swift emergency response to small fires in areas near hazardous substances to prevent ignition of flammable, explosive or oxidising substances. Segregation of incompatible substances Processing Plant Flammable, oxidising, corrosive, toxic and ecotoxic substances WTP Oxidising, corrosive, toxic and ecotoxic substances Development Site Flammable and Class 1 explosive substances Minimises additional adverse consequences from a spill or fire by preventing reactive substances from mixing in the storage area. Substance secured from unauthorised access Processing Plant Caustic soda, hydrochloric acid, cyanide (solid), cyanide solution, mercury, oxygen WTP Ferric chloride, hydrogen peroxide. Development Site Class 1 explosive substances Limits access to trained personnel and minimises the potential for operator error or tampering. Emergency response planning Processing Plant Diesel, quicklime, caustic soda, hydrochloric acid, cyanide (solid), cyanide solution, mercury, oxygen WTP Describes the emergency procedures for a site and takes into account any foreseeable emergency such as a fire, spill or injury. Emergency Response Plans must be regularly tested by the site.
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