B-7 – Area 7 - Assessment of Environmental Effects 37 3.2.1 Site Access The main site entrance will be via the existing Baxter Road Gate and the perimeter road around TSF1A and TSF2. A new haul road will be established through the East Stockpile as shown on Figure 24. This will extend the existing haul route behind TSF1A and 2, linking those areas to the existing stockpiles and conveyor loadout. Light vehicles and trucks will access the site from the perimeter road around the toe of TSF1A and 2 as can occur currently. 3.2.2 Topsoil and Subsoil Stripping The total footprint of TSF3, including the extent of the stockpiles and uphill diversion drain, is approximately 115 ha. 20 ha of this area is already part of the existing footprint of TSF1A and East Stockpile.3 The additional footprint is therefore 95 ha. Approximately 80 ha of topsoil and subsoil will be progressively stripped from the footprint of TSF3, which includes several unnamed stream beds and drains. This includes 5 ha on the existing TSF1A embankment. The extent of topsoil stripping and stockpiling is shown in Figure 24. Erosion and sediment control measures will be adopted during the work in accordance with Section 3.2.6 below. Compressible soils will be excavated from the TSF3 impoundment area and the embankment footprint. Under the embankment, any compressible soils will be replaced with suitable structural fill material mined from the GOP. The impoundment area will be formed to provide a suitable surface for placement and anchoring of the geomembrane. Up to 2 Mm3 of material that is unsuitable for use in the foundation will potentially need to be removed from the impoundment area and embankment footprint to facilitate construction of the key cut, upstream cut off and toe drains. Some of this material will be stockpiled in the TSF3 Stockpiles (refer Figure 24) and some will be worked into the embankment. None of this material will be removed off-site unless contamination levels warrant off-site disposal in accordance with the Site Management Plan. It is noted that the Preliminary Site Investigation report has not identified any soils within the impoundment area that are likely to require removal off-site. Sufficient area for up to 3.0 Mm3 of stockpile volume will be provided outside the embankment and impoundment footprint. Stockpiles will vary in height between 16 m and 47 m. Stockpiled material will be used in rehabilitation to the extent possible and 3 Refer to Section 2 of the AEE for a description of the existing consents.
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