U:\2021\BM210482_IBo_Waihi_North_Project\Documents\WNP_Freshwater_Report_May_2022\FINAL_Freshwater_Report_FOR DELIVERY_June 2022\FINAL DELIVERED 17 JUNE 2022\WAI-985-000-REP-LC-0007_Rev0_Freshwater_20220621_FINAL.docx 18.3 Summary of Effects Assessment on Ecological Values A summary of effects of the proposed NRS is provided in Table 28. The overall level of ecological effect of the proposed works of the proposed activities at NRS on the freshwater ecological values after application of effects management is Very Low. Table 32: Overview of the level of effects resulting from the proposed NRS (including effects management). Feature Ecological value Effect Magnitude of effect Effects management Level of effect after management Residual effects TB1 Moderate Diversion of 1,391 m length of stream Low Fish and kōura salvage and relocation. Ecologically functioning diversion. Very low Minimal / None No net loss Reduced aquatic connectivity Low Offset through diversion Very low No net loss Sediment intrusion Low Settlement and treatment prior to discharge Very low Minimal / none 19.0 Discharge From the Water Treatment Plant 19.1 Introduction As outlined above, it is proposed to renew the WTP Discharge Consent to allow for a term of consent sufficient to cover the full duration of the Waihi North Project including an appropriate closure period. In this section we assess the water quality and the ecological values of the Ohinemuri River. We demonstrate that as no changes are planned to the nature of contaminants within the discharge to the Ohinemuri then no increased effects will occur on the ecological values of the Ohinemuri River. Nevertheless, in this section we review the effectiveness of the existing water quality criteria in terms of maintaining the ecological values of the Ohinemuri River. Our assessment demonstrates that the standards currently imposed on the discharge consent via conditions remain appropriate for the protection of ecological values of the Ohinemuri River. Our assessment also reviews the effects of the discharge against the relevant attribute states expressed in the NPS-FM, noting that as yet the National Objectives Framework has not been applied to the Ohinemuri and so environmental outcomes, target attribute states, and implementation plans have not been established.
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