RFI - Stormwater management (flood report)

      4. CONSTRUCTION PHASE MANAGEMENT
             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 drainage
             reserve 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 day’s 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; and
          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.




21-0166SMP01-V1 | Stormwater Management Plan | 25 Pavilion Street, Pomona                                   | 19