B-1 - Area 1, Coromandel Forest Park – Assessment of Environmental Effects 82 The key risks identified for the activities in Area 1 include: Risk to people or property from fire or detonation at the explosives magazines, oxidiser storage area or diesel tanks; Risk to ecosystems from a spill of diesel during tank filling or equipment refuelling; and Risk to ecosystems from a spill of packaged goods during unloading to site. The risks to people, property and the environment from an unintended detonation at the proposed explosives storage locations is assessed as low and will be managed through site and equipment design and management controls (personnel access restrictions, security monitoring, staff training and handler certification, and emergency response plans). The surrounding areas at the surface in the CFP above the WUG are considered sensitive to the effects of an unintended detonation. However, taking into account the proposed controls and distance to sensitive land uses, the effects on offsite people and property from the proposed hazardous substances storage has been assessed as less than minor. Similarly, the impact of a detonation of the Class 1 explosives in the WUG has potential to impact people in the CFP in the vicinity of the mine ventilation stacks. A quantitative assessment of the effect using dispersion modelling was undertaken in an Air Quality Assessment, which found that even with a number of conservative inputs, criteria for the protection of human health is met at all locations around the surface connections. 5.15 CONCLUSION This chapter of this sub-AEE contains an assessment of the actual and potential effects of allowing the proposed activities within the CFP. They include establishment, operation and closure of the Dual Tunnel and WUG, and the implementation of the Waihi North Biodiversity Project. The nature of the activity means most of the mine related activities are subsurface, with the surface manifestations within the CFP being limited to: Those associated with the establishment and operation of four ventilation raises; Episodic surface vibration due to blasting within the mine; and The positive effects which manifest as a result of the Waihi North Biodiversity Project. The effects associated with the establishment and operation of the vent raise sites will be very small and localised. They will be similar in nature to those associated with establishment of OGNZL’s various exploration drilling sites in this area which are managed effectively in accordance with a range of conditions imposed by DOC under its access
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