SECTION 5 WUG Access Tunnel C:\D Data\GWS C Drive\GWS\Client Files\1344 OGL - WKP\4 Deliverables\WUG Effects Summary\June 2022\WNP Groundwater Effects Summary_Final_Rev_0.docx 19 Drawdown Extent No ongoing groundwater drawdown effects are expected due to the low rockmass permeability of the andesite and given any zones of higher inflows will be sealed off. As a result, no effects are expected in the near surface due to development of the ore access tunnels. Other Effects Related to the Take Given the absence of drawdown effects associated with development of the tunnels, no effects are expected on surface waters, other groundwater users, plant growth, other aquifers or water quality. Effect on Water Quality Once the WUG Access Tunnel is no longer required, rewatering will occur and the groundwater system will return to its previous state. Some groundwater will come into contact with the cement grout and backfilled rock, however this is not expected to change the overall quality in the aquifer due to the limited contact area relative to the system throughflow. In summary, no adverse effects on groundwater and therefore surface water quality are expected from the WUG Access Tunnel while dewatered or following closure. Monitoring Monitoring of shallow and deep groundwater levels is proposed around the portal and decline and where the tunnel is in close proximity to groundwater users.
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