3 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 landholding in Waihi. The assessment has been prepared following guidance contained in the listed reference documents below: Assessment Guide for Hazardous Facilities (ME339), Ministry for the Environment, 2000 Hazardous Industry Planning Advisory Paper No.4, Risk Criteria for Land Use Safety Planning. State of New South Wales through the Department of Planning, 2011 Hazardous Industry Planning Advisory Paper Assessment Guideline Multi-level Risk Assessment. State of New South Wales through the Department of Planning, 2011 Land Use Planning Guide for Hazardous Facilities, Ministry for the Environment, 2002 Decision making: A technical guide to identifying, assessing and evaluating risks, costs and benefits, Environmental Risk Management Authority, 2009 Risk Assessment Methodology for Hazardous Substances, Environmental Protection Authority, January 2020 This assessment report has been prepared to supplement theWaihi North Project – Resource Consent Applications and Assessment of Environmental Effects prepared by Mitchell Daysh Limited, dated June 2022. The assessment of the impact of explosives storage has been informed by theDevelopment Site – Surface Magazine Location Assessment, Waihi North Project prepared by Global Seismic Solutions Ltd, 20 October 2021 (GSS, 2021) attached as Appendix A. This location assessment has been prepared to identify the potential level of effect at off site locations and ensure that it complies with levels that are identified in the HSW-HS to minimise adverse effects at sensitive receptors off site. The GSS report identifies the following supplementary guidance which has informed the quantification of impacts as well as the design of the explosives storage facility to minimise the identified risks to off site people: AS 2187.1 Explosives—Storage, Transport and Use, Part 1: Storage International Ammunition Technical Guideline (IATG 2.20), Quantity and Separation Distances (United Nations - Safer Guard) (2nd Edition 01.02.2015) International Ammunition Technical Guideline (IATG 1.80), Formulae for Ammunition Management (United Nations - Safer Guard) (2nd Edition 01.02.2015). 1.4 Definitions The following terms are used throughout the report and have distinct meanings as set out in the Ministry for the Environment’s Assessment Guide for Hazardous Facilities (2002) or the Resource Management Act 1991: Hazard – describes physical situations, process and/or actions that have the potential to exert adverse effects on people, ecosystems and/or the built environment. Risk – is the likelihood of specified consequences of a specific event (eg, explosion) on people, ecosystems and/or the built environment. Therefore, the magnitude of risk is the product of probability and consequence (Risk = Probability x Consequences). Effect – means any impact or change as a result of an activity and, as defined by Section 3 of the RMA, can be positive or negative, temporary or permanent, applicable to the past, present or future, or cumulative with other effects.
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