Intent – To eliminate or minimise the risks of significant environmental harm as a result of erosion and sedimentation

Critical Controls

  • Water diversion drains are in place to prevent clean water from entering the site from upstream/offsite areas
  • Sediment basins are the required size and have stabilised emergency spillways (note: design criteria for spillways is 20-year average recurrence interval event)
  • Sediment basins have provision for identifying the level of accumulated sediment within the basin and water level
  • Sediment basins are treated using approved flocculants and discharged within 5 days of the cessation of rain
  • Temporary drains are in place to divert construction run-off to sediment basins and have been designed to convey the design rainfall event. This is typically the 1 in 10 year, critical time of concentration rainfall event.
  • There are no areas where run-off from disturbed areas can leave the site without sediment controls
  • Temporary erosion controls are provided for areas disturbed by the project within waterways
  • Sediment controls are maintained and have a minimum of 70% sediment storage capacity
  • Wheel wash/shaker grid and hardstand are installed at site exits to prevent tracking sediment onto roadways. Roadways are clear of tracked sediment.
  • Stormwater pits that receive site runoff and all stockpile areas have functioning sediment controls in place. Erosion control provided for long term stockpiles.
  • Stockpiles are located away from any concentrated overland flows, and located outside of flood prone areas (i.e. above the 20-year average return interval flood event limit)
  • Sediment basins are sized in accordance with the requirements of the Blue Book, Best Practice ESC (IECA 2008) guidelines, the environmental licence and the relevant conditions of approval

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