B-2 – Area 2 - Assessment of Environmental Effects 31 A small freestanding generator will be located on site to power communication and control infrastructure in the event of electricity outages. 3.2.6 Office, Crib Room and Change House An office, crib room and change house comprised of modular, demountable single-storey buildings, with a total ground floor area of approximately 1000 m2, will be established in the Willows SFA and serviced with electricity and water connections and a sewerage system. 3.2.7 Vehicle Wash Facilities A heavy vehicle wash bay will be established to provide high pressure washing of vehicles before entering the maintenance facility. The wash bay will include access platforms, a high pressure spray unit and support davit, a drainage pad and collection sump and a water storage tank. Water from the drainage pad and sump will drain into the storage tank, before being pumped to the collection pond and subsequently, to the WTP for treatment. A light vehicle wheel wash system will also be installed to provide onsite washing facilities for light vehicles before accessing the public roading network. 3.2.8 Service Workshop Temporary workshops and facilities will be established by the construction and tunnelling teams during the construction phase of the project. Thereafter, and in alignment with the commencement of mining, a permanent service workshop will be established. The workshop will include a sealed undercover area of approximately 400 m2, and a gravel apron of approximately 200 m2. The workshop floor will be concreted with drainage directed to a sump and oil separation facility. The workshop building will be approximately 10m in height. 3.2.9 Refuelling Refuelling will be undertaken via a dedicated fuel truck drawing from a surface selfbunded 40’ isotainer located at the Willows SFA with a nominal capacity of up to 80,000 L. As tunnelling progresses, a self-bunded and appropriately certified fuel tank will be installed underground. This will likely comprise a relocatable 4550 L capacity SatSat system, located close to the operating area in a refuelling bay cuddy. The underground tank will be serviced by the fuel truck on a regular basis. 3.2.10 Willows Rock Stack The WRS, a temporary rock stack of approximately 5 ha, will be located as depicted in Figures 17 and 18 and will result in the infilling of an unnamed tributary of the Mataura Stream.
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