Site Based Stormwater Management Plan

5.0 STORMWATER QUALITY MANAGEMENT

In accordance with the Noosa Plan (2020) the site will be provided with stormwater quality
treatment to mitigate post-developed pollutants discharging from the site. A bioretention
basin is proposed for the development area sized in accordance with the deemed to comply
outcome specified in the SPP (2017), where the bioretention basin is 1.5% of the
contributing catchment being 5,508m2. The deemed to comply outcome satisfies P06 of the
Planning scheme, and will provide stormwater quality treatment sized in accordance with
the SPP (2017).




5.1 CONSTRUCTION PHASE

5.1.1 Pollutants

Typical pollutants generated during the construction phase of a development are listed in
Table 5.1 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 5.1 Typical Construction Phase Pollutants


5.1.2 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.




Site Based Stormwater Management Plan                                             Page 11 of 19
2123-SBSMP-01_Version 1.0 (October 2021)