RFI Response (rec. 4.09.25) S25-137 Stormwater Report_Optimized

4.2        Construction Phase

Management of stormwater runoff during construction and the implementation of an erosion & sediment control
program is necessary to avoid impacts to receiving waters from pollutants typically generated during the construction
phase. Typical pollutants are described in Table 1 below:
                           Table 1 Pollutants typically generated during the construction phase

                 Pollutant                                                    Sources

  Litter (Gross Pollutants)               Paper, construction packaging, food packaging, cement bags.

  Sediment                                Unprotected exposed soils and stockpiles during earthworks and building.

  Hydrocarbons                            Fuel and oil spills, leaks from construction equipment.

  Toxic materials                         Cement slurry, asphalt prime, solvents, cleaning agents, wash waters.

  pH altering substances                  Acid sulphate soils, cement slurry and wash waters.
Refer Table A in separate SPP Appendix 2 for further stormwater management design objectives that are applicable
to all climatic regions.

4.2.1      Erosion and Sediment Control

In addition to the degradation of receiving waters, impacts of inadequate erosion and sediment control downstream
from the site include:
      1. Traffic safety problems
      2. Blocked drains
      3. Local flooding problems
      4. Aesthetic pollution of drainage paths, and
      5. Damage to local ecosystems
Best practice erosion and sediment controls must be installed to minimise the discharge of sediment laden run-off
during construction.
Erosion and sediment control plans shall be developed during detailed design phase and must be continually
maintained and amended as required to minimise environmental harm.
Erosion and sediment control plans are based on three sets of control measures:
      1. Drainage control
      2. Erosion control
      3. Sediment control
These control measures must be maintained in an effective operational condition. Sediment disposal from site is to
occur to the satisfaction of Noosa Council. Defects in erosion and sediment control devices, such as sediment fences
and baskets, are to be inspected and documented. Upon Inspection, the Contractor is to determine whether the
device should be replaced or repaired. Documentation is to include how the damage (if applicable) was caused and
what measures can be implemented to reduce the possibility of repeat occurrences. Any damage to either permanent
or temporary water quality control structures or devices is to be immediately rectified at the contractor’s expense.



 S25-137                                       Stormwater Management Report                                  Page 3 of 6
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