vi In summary, this assessment of effects has shown there to be minimal risk to shallow groundwater; surface waters; other groundwater users; and to plant growth from the proposed tunnels. The proposed tunnelling methodology will avoid effects to groundwater because: 1. The rockmass is of sufficiently low permeability that it will not dewater 2. The tunnels are sufficiently deep that depressurisation effects do not reach the surface If inflows zones are encountered these will be sealed off to mitigate any effects developing.
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