B-6 – Area 6 – Assessment of Environmental Effects 33 Northern Collection Pond and Northern Stockpile Silt Pond. The northern part of the site beyond the Northern Stockpile will then be developed along with the NRS Collection Pond. The perimeter infrastructure (road, surface water drain and seepage collection system) and uphill diversion drain will also be constructed. The perimeter drain will direct surface runoff to a collection pond and a seepage and leachate collection system will comprise manholes, pumps and a pipeline to the existing WTP. Some externally sourced aggregate and other construction materials will be required to supplement the construction of the NRS. This includes materials such as drainage metal, sand, roading metal, rockfill lining, concrete, drains, sumps, piping, and culverts. This material will be transported to the site via Baxter Road, and it is estimated that approximately 35 to 40 truck and 900 to 1100 truck and trailer loads will be required. More detail is provided in EGL (2022d). 3.4 NEW MAGAZINES A series of secure Class 1 explosives magazines conforming to the Health and Safety at Work (Hazardous Substances) Regulations 2017 will be established at the location depicted in Figures 14 and 15 to support the mining of the GOP. The magazine may also be used to store explosives used in any of OGNZL’s consented underground mines. The Class 1 storage facilities will hold high explosives (ammonium nitrate fuel oil, booster and packaged explosives) in a cumulative quantity of up to 6,400 kg. Up to 12 kg of initiative explosive (detonator devices) will also be stored at this location. The location and holding capacity of the magazines has been selected to ensure the required offsets are achieved from private property, publicly accessible lands and structures. 3.5 STORAGE AND USE OF HAZARDOUS SUBSTANCES Table 2 details the composition of substances stored within the magazine area described in Section 3.4 and lists the other hazardous substances to be used and stored in Area 6. It is noted that the existing storage of LPG at the Processing Plant (Area 5) will be displaced by the new Processing Plant substation. These tanks will be relocated to the western side of the Ohinemuri River approximately 130 m southeast of the Baxter Road bridge.
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