Attachment 7- Site Based Stormwater Management Plan

4.1 CONSTRUCTION PHASE

4.1.1 Pollutants

Typical pollutants generated during the construction phase of a development are listed in
Table 4.1 below.

  Pollutant                  Potential Source                                     Priority
  Litter                     Paper, construction packaging, food packaging,       High
                             cement bags, off cuts
  Sediment                   Unprotected exposed soils and stockpiles during      High
                             earthworks and building works
  Hydrocarbons               Fuel and oil spills, leaks from construction         High
                             equipment and temporary car park areas.
  Toxic Materials            Cement slurry, asphalt primer, solvents, cleaning    Medium
                             agents, wash waters (e.g. From tile works)
  Alkaline                   Cement slurry and wash waters                        High
  substances
                                Table 4.1 Typical Construction Phase Pollutants


4.1.2 Potential Impacts

Construction activities can have a potential impact on water quality. Removal of vegetation,
earthworks and changes to drainage patterns can result in erosion and sediment being
washed into waterways. This can impact on the physical-chemical parameters of the
receiving water, decline in the health of aquatic ecosystems, and overall aesthetics.
Potential impacts to the receiving waters surrounding the development site will be
minimized during the construction phase with typical measures as outlined below. These
measures should be adequately detailed on erosion and sediment control plans as part of
the development’s Operational Works application.


4.1.3 Performance Objectives

The amount of runoff traversing and discharging from the site while under construction
should be kept to a minimum. This will restrict soil erosion and mobilisation of sediments
and pollutants through and off the site.


Stormwater runoff at discharge points during the construction phase shall comply with the
objectives detailed in Table A in Appendix 2: Stormwater Management Design Objectives,
Part G, SPP (2017).

4.1.4 Control Measures

The following are typical treatment measures that should be implemented before the
commencement of any construction works. Detailed erosion and sediment control
procedures are to be based on the erosion and sediment control plans lodged at the
Operational Works phase.
Site Based Stormwater Management Plan                                              Page 5 of 20
1856-SBSMP-01_Version 2.0 (April 2019)