4 | P a g e Class 1 Location Assessment Willows Road - Surface Magazine, WUG - Waihi North Project . The ‘ Health and Safety at Work (Hazardous Substances) Regulations 2017’ also stipulates additional requirements of a PCBU in relation to mitigating risk from storage of class 1 substances including emergency response and requirements for competent person(s) to be in charge of such substances. Additional reference documentation, ‘ AS 2187.1 1998 – Explosives, Storage, Transport and Use – Storage’ has been considered in the assessment of a suitable location. This legislation provides guidance in relation to suitable Inter Magazine Distances or IMD, which supports the calculation of controlled zones using the NEQ of individual magazine units. Table 3.2.3.2 of AS 2187 describes the offset distances to ‘other explosive storage’. This table was utilised to support the separation distances between individual magazine units in relation to mitigating propagation risk. The use of bunding between individual magazine units in accordance with AS 2187.1 - Table 3.2.3.2 . has been considered when determining the IMD. Appendix B of the AS 2187.1 – Appendix B ’ describes the bund design requirements and construction methodologies to support the reduced IMD offsets. The ‘QD co-efficient formulae’ found in the ‘International Ammunition Technical Guideline (IATG 2.20) – Quantity and Separation Distances, part 6.1.2 – inter-magazine distances (IMD) , Table 8: Effects and impact of QD for HD 1.1’ or ‘Annex C, D and E’ has been considered in relation to propagation between individual magazines within an explosives compound. 3.1 Location Compliance Certification Sections ‘r.6.23 and r.9.26’ of the ‘ Health and Safety at Work (Hazardous Substances) Regulations 2017 ’ describe the requirements for certification of a site containing hazardous substances, namely ‘class 1 explosives’. The ‘Willows Road – Surface Magazine Facility’, would be a new facility at a separate location to any of the other OGNZL class 1 storage facilities. As such, it has been assessed as a standalone site against the relevant legislation. The certification process for a site that will store hazardous substances must consider the regulatory requirements described in sections ‘ r 9.11, 9.12, 9.13, 9.14, 9.15 and 9.16 ‘as well as appropriate emergency response and administrative controls. In addition to the compliance certification process, notification shall be given to Worksafe New Zealand in accordance with ‘ r 9.22 (4) of HSW (Hazardous Substances) Regulations 2017’. This notice must be provided at least 30 working days prior to the commissioning of the hazardous substance storage facility. 3.2 Other Design and Storage Considerations Site design must also consider the obligations for the storage of class 1 substances described in ‘ Part 9 of HSW (Hazardous Substances) Regulations 2017 . The types of considerations are outlined below. • 5 yearly magazine structure design and certification (r 9.20) . AS 2187.1 for build specification. • Site security requirements such as fencing and/or perimeter motion sensor (if deemed necessary). • Signage requirements. • Emergency response and evacuation including engagement with FENZ. • Earthing requirements and protection from lightning strike. • Qualification, training and competence for handlers of class 1 substances. • Mounding requirements (‘ Table 3.2.3.2’ and ‘ Appendix B’ of ‘ AS 2187.1’’ ). Further administrative and personnel obligations are described in Parts 1-8, HSW (Hazardous Substances) Regulations 2017. These must be considered in the final site design process as well as the management plans under which the site will be operated.
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