SECTION 3 Groundwater Effects Assessment – WUG Access Tunnel 13 further drainage effects are expected in the near surface. Therefore, the potential for effects on streams and springs is considered to be negligible. 3.4.4 Potential for Effects on other Groundwater Users Figure 9 shows the locations of groundwater users adjacent to the proposed tunnel alignment. Two of these bores (72_5193 and 72_771) are 86 m deep and come to within 400 m proximity to the proposed WUG access tunnel. These bores are small diameter and do not have associated groundwater take consents and are assumed to be for domestic or stock purposes. Another bore (72_1223) is within closer proximity to the tunnel but there are no construction details. If this bore exists it too is expected to be a domestic or stock water supply. Figure 9 Groundwater Users near the WUG access Tunnel Experience with tunnelling in Waihi and groundwater modelling both indicate the lateral effects of depressurisation around the tunnel will be limited due to the andesites low rockmass permeability. For this reason, we do not consider it likely that groundwater users will be adversely affected by the proposed WUG access tunnel.
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