B-7 – Area 7 - Assessment of Environmental Effects 42 Southern Skies (2022) includes: An Erosion and Sediment Control Assessment Report (“ESCAR”) which provides: o The overarching erosion and sediment control (“ESC”) principles and procedures for the earthwork activities associated with the Waihi North Project o An assessment of the effectiveness of those ESC principles and procedures in minimising potential sediment discharges to an acceptable level; and o Concepts that inform the development of the draft Site Specific Erosion and Sediment Control Plans (“SSESCPs”); A Chemical Treatment Management Plan (“CTMP”); An Erosion and Sediment Control Monitoring Plan; and Draft SSESCPs for each project Area (including Area 7). In accordance with accepted best practice it is intended that OGNZL will provide final SSESCPs for each project area for certification by the Consent Authority following detailed design but prior to commencing any earthworks onsite. The principles of the Waikato Regional Council Technical Report No. 2009/02 Erosion and Sediment Control Guidelines for Soil Disturbing Activities, January 2009 (TR2009/02) have been adopted by Southern Skies (2022) for the design, construction, maintenance and decommissioning of erosion and sediment control measures. However, as a result of the scale and nature of the works proposed, Southern Skies (2022) identify that deviations from that standard will be required to achieve the outcomes sought by the ESCAR. The deviations will be provided in SSESCPs and by implementing those deviations Southern Skies (2022) identify that the works will achieve the same or better outcome than a TR2009/02 compliant approach. By way of summary the erosion and sediment control measures will include: Installation of silt fences on steep slopes where possible; Construction of temporary clean and dirty water diversion drains; Construction of earth detention bunds; Construction of sediment retention ponds; and Use of flocculants. 3.3 TSF3 CONSTRUCTION A detailed construction methodology for TSF3 is provided in EGL (2022c), a copy of which is provided in Part H of these application documents.
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