9 | P a g e Class 1 Location Assessment Willows Road - Surface Magazine, WUG - Waihi North Project . • The 2 kPa controlled zone does cross into neighbouring property. However, at the time of writing no ‘vulnerable facilities’ exist within this zone and 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 proposed H.E and 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 1,150 kg NEQ 465 m 233 m 155 m 117 m 75 m H.E 2 1,150 kg NEQ 465 m 233 m 155 m 117 m 75 m H.E 3 1,150 Kg NEQ 465 m 233 m 155 m 117 m 75 m H.E 4 1,300 kg NEQ 485 m 242 m 162 m 122 m 79 m H.E 5 1,300 Kg NEQ 485 m 242 m 162 m 122 m 79 m H.E 6 1,300 kg NEQ 485 m 242 m 162 m 122 m 79 m I.E 1 10 kg NEQ 96 m 48 m 32 m 24 m 16 m ‘Table 1 – Controlled zone offset table specific to each magazine and proposed stored NEQ’ Where I.E magazines are positioned within minimum IMD for ‘other explosives storage’ as per ‘ Table 3.2.3.2 of AS 2187.1 ’, the aggregate NEQ for relevant H.E and I.E magazines is used to calculate the controlled zone area. Figure 3 shows the proposed class 1 storage facility layout including the positioning of individual magazine units. The controlled zones shown in figure 3 are a representation of the aggregate of the controlled zones for each of the individual magazine units. Figure 4 provides a more detailed view of the class 1 storage facility including details of individual magazine storage capacities.
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