RFI - stormwater report

4 Construction Phase Management
4.1 Erosion and Sediment Control
The management of the site during the construction phase is an important step in
ensuring water quality standards are achieved. Implementation of best practice
Erosion and Sediment Control techniques is imperative to managing the quality of
runoff affected by construction works.
The following points provide general guidance on the management of stormwater
during the construction phase. Detailed Erosion and Sediment Control Management
Plans should be developed in conjunction with the Operational Works design prior to
construction works commencing in accordance with the International Erosion Control
Association (IECA) - “Best Practice Erosion and Sediment Control (BPESC) document”
and overseen by a Certified Professional in Erosion and Sediment Control (CPESC) or
Registered Professional Engineer Queensland (RPEQ).
   1. Establish a single stabilised entry/exit point for the site works;
   2. Construct a shake-down grid at the entrance to facilitate the removal of
      sediment from trucks leaving the site. The access road extending from the end
      of existing road or kerb to the grid should comprise a 150-200mm deep pad of
      40mm crushed rock;
   3. Install sediment fences along the lower boundaries of the site;
   4. Construct one or more strategically placed sediment basins in the proposed
      natural waterway and construct contour drains / bunds to direct disturbed
      runoff to the sediment basins;
   5. Install bins and/or wind-proof litter areas on-site to minimise the dispersion of
      gross pollutants;
   6. Maintain on site sufficient materials necessary for the emergency repair of all
      erosion control devices. This includes silt fences, clean crushed rock for
      reapplication to the entrance road and for replacement of rock within
      temporary drainage channels, and flocculants for settling sediment basins;
   7. Following each days construction works, ensure that any material on road
      surfaces is swept from the road, and not permitted to be washed down the
      gutters and piped drainage systems.
   8. Quality of pooled water within sediment basins are to be monitored prior to
      dewatering, sufficient time should be given to allow sediment to settle
      (possible with the assistance of a suitable flocculent if necessary) &/or filtering
      during pumping operations.
   9. Final establishment of bioretention basin should not occur until full
      stabilisation of upstream catchment has occurred; preferably these should be
      temporarily turfed during the maintenance period while dwelling construction
      is occurring.
It shall be the responsibility of the developer, through their principal contractor, to
ensure that temporary sediment and erosion controls are installed and maintained
correctly.

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