B-2 – Area 2 - Assessment of Environmental Effects 50 Activity Relevant Rules Comment To discharge overburden on to land at the WRS and associated Mine Access Road. Discretionary activity under Rule 5.2.5.3. This material meets the definition of overburden and is not an ‘overburden disposal site’ as it is for the storage, not disposal of overburden. It will also contain PAF material. So permitted activity Rule 5.2.5.1 and controlled activity Rule 5.2.5.2 do not apply to the activity. To discharge sediment laden water to land within temporary sediment retention ponds and decanting earth bunds and to discharge water from those devices to surface water via spillways. Discretionary activity under Rule 3.5.4.5. The sediment retention ponds, and decanting earth bunds designed to capture and treat runoff will include an emergency spillway sized to convey the 1% AEP rain event. The potential discharge of sediment laden water to land within the retention ponds and decanting earth bunds which may result in contaminants entering water will require resource consent. It is not expected any sediment retention ponds or decanting earth bunds will be required within 100m of the Mataura wetland and therefore resource consent is not required under Regulation 54 of the NES Freshwater. To discharge water to surface water from the Main Collection Pond via an emergency spillway. Discretionary activity under Rule 3.5.11.8. Non-complying activity under Regulation 54 of the NES Freshwater. Overflow water from the Main Collection Pond will be discharged to the Mataura Stream via a spillway. This will only occur during high flow events (10 year ARI, 24 hour storm). At all other times, water will be pumped back to the WTP for treatment prior to being discharged. The discharge point is within 100m of the Mataura wetland. It is therefore subject to Regulation 54 of the NES Freshwater.
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