B-2 – Area 2 - Assessment of Environmental Effects 49 Activity Relevant Rules Comment Non-complying activity under Regulation 54 of the NES Freshwater. be in off-stream areas and able to comply with the permitted activity standards (3.6.4.4(a) – (j)), including provision of a suitable spillway, it can be undertaken as a permitted activity. However, the damming will occur within 100m of the Mataura wetland. It is therefore subject to Regulation 54 of the NES Freshwater. To dam water within the Main Collection Pond. Permitted activity under Rule 3.6.4.4 Damming of water is required to construct the Main Collection Pond and Dry Detention Pond. Given this damming of water will be in off-stream areas and able to comply with the permitted activity standards (3.6.4.4(a) – (j)), including provision of a suitable spillway, it can be undertaken as a permitted activity. Discharges to land and water (RMA s15(1)(a) and (b) consents) To discharge contaminants to land and groundwater when sealing tunnels and shafts with grout or shotcrete. Discretionary activity under Rule 3.5.4.5. Discretionary activity under Rule 5.2.5.3. The progressive sealing of tunnels and shafts with grout or shotcrete to manage water ingress will require the discharge of contaminants to land and groundwater. To discharge contaminants to land and groundwater associated with the underground storage, use and backfilling of overburden containing potential acid forming material. Discretionary activity under Rule 3.5.4.5. Discretionary activity under Rule 5.2.5.3. Overburden material (including PAF material) will be stockpiled underground in various areas along the tunnel alignment. It will also be used as backfill during rehabilitation. The overburden will contain PAF material and therefore does not meet the conditions of Rule 5.2.5.1 or 5.2.5.2.
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