B-2 – Area 2 - Assessment of Environmental Effects 33 Figure 18: WRS and Collection Pond. 3.2.12 Stream Diversions and Crossings The lower reaches of the Willows Portal access road traverses an unnamed tributary of the Mataura Stream. The tributary will be piped and culverted under the access road before being discharged into an existing wetland. The new culvert crossings will be constructed to support mine traffic and to provide for fish and eel passage into the tributaries. 3.2.13 Water Management Infrastructure A package sewage treatment plant will be installed within the Willows SFA with discharge water directed to an effluent disposal field that will be located remotely from the Mataura Stream and tributaries (refer Figure 17). A stormwater retention pond will be established at the Willows SFA to capture stormwater runoff from this area. 3.2.14 Explosives Magazines A series of secure Class 1 explosives magazines conforming to the Health and Safety at Work (Hazardous Substances) Regulations 2017 will be constructed within the Willows Road Farm. The location and holding capacity of the magazines has been selected to
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