REV DATE REVISION DETAILS APPROVED 0 03.02.22 Draft for review. Project WAIHI NORTH Title Erosion & Sediment Control Plan Northern Rock Stack – Stage 1 Drawn ZW Checked MP Drawing No. ESCP-NRS-001-02 Sheet No. 2 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. Existing Collection Pond Stage 1 – NRS establishment Utilise existing infrastructure (collection ponds and diversion drains) to capture water runoff. SRP-NRS-04 Catchment area: 1.1ha Total volume: 330m3 Dead storage: 99m3 Live storage: 231m3 Refer to specific SRPNRS-04 design details. Existing Collection Ponds Construction Methodology Workshop Platform and Rehab Stockpile - Initially a silt fence will be installed below the footprint of SRP-NRS-04. The SRP will then be constructed at the approximate location shown. - Perimeter bunding will be constructed (likely topsoil) and stabilised on the external ‘clean’ side of the bunds to direct runoff to the SRP for treatment. - Earthworks will then commence to construct the workshop platform and rehab stockpile. Existing haul roads will be used. - Once the workshop platform is at design level it will be sheeted with aggregate. Stockpiles will likely be stabilised with seed and mulch. Northern Rock Stack (NRS) During this stage, runoff from the NRS area will continue to flow via the existing drainage network and infrastructure to the existing collection ponds. Once the new Collection Pond has been constructed (refer to ESCP-NRS-001-03), then the NRS will be capable of receiving PAF. Extent of current NRS work. KEY Erosion and Sediment Control Clean Water Diversion Dirty Water Diversion Culvert Silt Fence Sediment Retention Pond Rehab material stockpile Workshop
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