Supporting Technical Assessments

REV DATE REVISION DETAILS APPROVED 0 07.06.22 Draft for review. Project WAIHI NORTH Title Erosion & Sediment Control Plan Willows Road – Magazine Storage Area Drawn ZW Checked MP Drawing No. ESCP-WR-003-03 Sheet No. 6 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 on a daily basis 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 Super Silt Fence Sediment Retention Pond Decanting Earth Bund Sediment Retention Pond 3 (SRP-3) Catchment area: 1.2ha Total volume: 240m3 Dead storage: 72m3 Live storage: 168m3 Pond dimensions: 30m x 10m x 1.5m Clean water diversion directed to culvert under access road. Upgrade existing culvert to 450mm diameter pipe for 2ha clean water area. Access road construction Runoff diverted along table drain to SRP-2. Super silt fence below fill. Screening bunds will be constructed using topsoil and used to divert runoff to culvert. Trafficable bund at magazine storage area entrance. Dirty water conveyed to SRP-3 using ø450mm boss pipe for 1.2ha catchment area. CWD bunds – Magazine Storage Area (2ha)

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