Swmp

5.0 STORMWATER QUALITY MANAGEMENT

The proposed development site is 546m2, being substantially less than 2,500m2 the
development is exempt from meeting stormwater quality treatment objectives specified in
Qld SPP (2017). For the scale of the development the proposed development will be
provided with alternative stormwater quality treatment outcomes to mitigate stormwater
borne pollutants. Hardstand surfaces will be sloped to landscaped areas where possible
thus buffering stormwater runoff from the property.


Section 4.1 below outlines the construction phase stormwater management objectives.


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.