30 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 Ref Exclusion from zone Blast overpressure Offset distance Comment r 9.27 (2)(d) Vulnerable facilities defined in the HSW-HS regulations as: a) buildings of 4 storeys or more, of curtain wall construction with panels more than 1 500 mm square: b) buildings of 4 storeys or more with more than 50% of the wall area glazed: c) a hospital care institution, residential disability care institution, or rest home (as defined in section 58(4) of the Health and Disability Services (Safety) Act 2001), early childhood education and care centre (as defined in section 310 of the Education Act 1989), or school (as established under section 146 of the Education Act 1989): d) public buildings or structures of historic value: e) major transport and traffic terminals such as railway stations and airports handling more than 1 800 people in 24 hours: f) major public utilities whose service could be disrupted by a blast of 5 kPa: g) any similar facilities. 2 kPa 507 m No vulnerable facilities currently within this zone. r 9.27 (4) A PCBU with management or control of a hazardous substance location that is used solely for securing and holding a class 1 substance must limit the quantities of any class 1 substance at the location to ensure that, in the event of an unintended initiation - the interior of any proximate building where a class 1 substance is manufactured would not be subject to a blast overpressure of more than 24 kPa. 24 kPa 79 m No Class 1 manufacturing proposed within the radius described. The overpressure offset distances are illustrated inFigure 5.1below, showing areas of overlap with neighbouring properties.
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