B-6 – Area 6 – Assessment of Environmental Effects 100 o overflow discharges from the sediment retention and collection pond will only occur in events larger than the 10-year ARI (72-hour storm) event, when sediment loads are already elevated; and o any changes to groundwater levels or quality are likely to have a negligible effect on the groundwater receiving environment; The effects associated with the construction of the NRS and associated diversion channel on the large area of native restoration planting are described in Section 5.8 of this AEE. In summary, the area is of low ecological value and supports limited (if any) indigenous fauna or their habitats. Removing this area will therefore generate very low (minor) adverse effects for indigenous biodiversity; As described in Section 5.7 the effects associated within the diversion of TB1 on aquatic ecosystems will be minor, reducing to very low after mitigation; As also described in Section 5.7, discharges of sediment from sediment retention and collection ponds and seepage of leachate to groundwater and surface water will not generate significant adverse effects on aquatic ecosystems, nor will it affect the reasonably foreseeable range of groundwater and surface water uses;98. As noted with respect to Policy 11 of the NPSFM, the diversion of ground water associated with the NRS will not impact on the allocation status of the Ohinemuri catchment;99 Activities within Area 6 will not result in a reduction in the extent or quality of the Region’s wetlands, with the removal of a constructed wetland on-site being replaced by a newly established wetland as part of the closure plan for the NRS;100 TB1 is identified as part of the Waikato Region Surface Water Class. The activities occurring within Area 6 will not affect the values and uses ascribed as part of this water management class;101 Natural character is discussed in Section 5.3 of the AEE. As concluded in this section, the proposed activities within the river and its margins are not inappropriate from a natural character perspective;102 and Approximately 70 to 100 m3/day of leachate is predicted to migrate to the Ohinemuri River, resulting in minimal changes to the water quality of the Ohinemuri River, as discussed by GHD (2022b). This level of contaminant leaching will not pose a risk to human health or aquatic ecosystems within the Ohinemuri River. 98 Objective 3.1.2(c) and (f), Section 3.1, Waikato Regional Plan. 99 Objective 3.1.2(g) and (e), Section 3.1, Waikato Regional Plan. 100 Objective 3.1.2(h), Section 3.1, Waikato Regional Plan. 101 Objective 3.1.2(k) and (n), Section 3.1, Waikato Regional Plan. 102 Objective 3.1.2(l), Section 3.1, Waikato Regional Plan.
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