8 | P a g e Class 1 Location Assessment Development Site – Surface Magazine, Waihi North Project Controlled zone definition – 5 kPa r 9.27(2)(c)(i) - public traffic routes of high density, areas of high intensity land use, or any area where a person may be legally present inside the boundary of the place where the hazardous substance location is located are not subject to any of the following: i. a blast overpressure more than 5 kPa. Formula for minimum offset distance in accordance with the above criteria – D = 22.2Q1/3 Proposed class 1 site - Compliance summary. • Applies to any person legally inside boundary of OGNZL owned land, whether employees or members of the public irrespective of number or density. • Managed by way of OGNZL ERP and evacuation (e.g., Muster location must be outside this area). • The controlled zone does not cross into any public high density traffic routes or area of high intensity land use. Controlled zone definition – 2 kPa r 9.27(2)(d) - vulnerable facilities are not subject to more than a blast overpressure of 2 kPa. Formula for minimum offset distance in accordance with the above criteria – D = 44.4Q1/3 Proposed class 1 site - Compliance summary. • The 2 kPa controlled zone does cross into neighbouring property. However, at the time of writing no ‘vulnerable facilities’ exist within this zone and the site would be fully compliant. • Should a vulnerable facility be constructed within the 2 kPa zone on the neighbouring property, OGNZL will either need to adjust the storage capacity or relocate the storage facility. Table 1 summarises the minimum offset distances for the 4 proposed H.E magazines and the two I.E magazines. The offset distances are based upon the use of mounding between individual magazine units and that the IMD is based on the mounded offsets described in ‘ Table 3.2.3.2 ‘of ‘ AS 2187.1’. Magazine ID and Maximum Stored Quantity Min. Offset Distance 2 kPa Min. Offset Distance 5 kPa Min. Offset Distance 9 kPa Min. Offset Distance 13 kPa Min. Offset Distance 24 kPa H.E1 1,300 kg NEQ 485 m 242 m 162 m 122 m 79 m H.E 2 1,750 kg NEQ 535 m 268 m 178 m 135 m 87 m H.E 3 1,750 Kg NEQ 535 m 268 m 178 m 135 m 87 m H.E 4 1,600 kg NEQ 519 m 260 m 173 m 131 m 84 m I.E 1, 2 12 kg NEQ 102 m 51 m 34 m 26 m 16 m ‘Table 1 – Controlled zone offset table specific to each magazine and proposed stored NEQ’
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