REV DATE REVISION DETAILS APPROVED 0 17.06.22 Draft for review. Project WAIHI NORTH Title Erosion and Sediment Control Plan Tailings Storage Facility 3 – Stage 1 Drawn ZW Checked MP Drawing No. ESCP-TSF3-001-04 Sheet No. 4 NOTES 1. All erosion and sediment controls will be installed and maintained in accordance with the Waikato Regional Council Technical Report 2009/02 ‘Erosion and Sediment Control Guidelines for Soil Disturbing Activities’ (TR2009/02). 2. Completed areas to be stabilised in accordance with TR2009/02. 3. All erosion and sediment control measures will be inspected weekly by the site foreman. 4. Site monitoring will be undertaken before and immediately after rain as well as during heavy rainfall events. Any required maintenance or improvements to control measures will be undertaken immediately. KEY Erosion and Sediment Control Clean Water Diversion Dirty Water Diversion Culvert Silt Fence Sediment Retention Pond SRP-TSF3-06 Catchment area: 5.0ha Total volume: 1,500m3 Dead storage: 450m3 Live storage: 1,050m3 Construction Methodology - Realign Ruahorehore Stream Install silt fence below SRP-TSF3-06 and construct SRP (although likely with no outlet until the stream diversion is completed). This SRP will be constructed early to provide for the stream realignment but is constructed for the earthworks associated with the Collection Ponds. Sections of stream realignment will be undertaken offline with no earthworks impact on the existing stream channel. Any dirty water will be pumped to SRP-TSF3-06 for treatment. Once the new offline stream sections are completed and stabilised as per the Ecologists recommendations then the downstream tie in, followed by the upstream tie in will be completed. The tie ins will utilise a dam and over-pump methodology during day works. Each tie in will likely be completed within 1-2 days. Approximate alignment of Ruahorehore Stream to be constructed offline. Approximate existing alignment of Ruahorehore Stream to be realigned.
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