REV DATE REVISION DETAILS APPROVED 0 07.06.22 Draft for review. Project WAIHI NORTH Title Erosion & Sediment Control Plan Willows Road – Willows Rock Stack Drawn ZW Checked MP Drawing No. ESCP-WR-002-01 Sheet No. 3 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 Emergency spillway from Collection Pond Collection Pond Design volume: 18,700m3 capacity. Rock stack catchment area: 5.5ha. Based on WRCs TR2009/02 a 5.5ha catchment would require 1,650m3 of volume at 3%. Fitted with concrete manhole, 450mm outlet pipe and 4x T-bars during enabling earthworks phase. Permanent stream culvert. Size and installation methodology TBC. Temporary clean water diversion culvert installed beneath farm track. Approximate location for topsoil stockpiles. WRS seepage collection pond – ~500m3 capacity. Super silt fence Topsoil stockpiling as construction of WRS progresses. Topsoil to be progressively stabilised. CWD – South (1.25ha) Staged clean water diversion construction. Erosion and sediment control measures provided for enabling earthworks including construction of Collection Pond and Year 1 catchment of WRS. Staging and construction details of Rock Stack provided by Golder. Indicative Year 1 construction staging. Refer to Golder design report for details. 2x 825mm diameter culverts (size determined by Golder). CWD – North (2ha) Staged clean water diversion construction. CWD channel – WRS Year 1 (6ha) CWD bund – Mine Access Road (2ha)
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