Stormwater Management Report · MCU19/0008

4      ST O RMWAT ER Q UAL I T Y M AN AG EMENT

4. 1       O p erati o n al Ph ase

The development is not required to meet the Queensland Governments State Planning Policy (July
2017) as the site does not exceed the 2,500m 2 minimum site area. Stormwater quality management is
therefore proposed to be undertaken via the application of best management practices (BMPs) to
ensure no adverse impacts to the downstream environment.
Pollutants typically generated during the operational phase of the development include:
           litter/gross pollutants
           sediment (Total Suspended Solids – TSS)
           nutrients (Total Nitrogen and Total Phosphorus – TN & TP)
           hydrocarbons (oils and grease)

           heavy metals

Stormwater quality best management practices may be implemented for the development as follows:

           First flush diversion system for roof water diverting the roof water for irrigation purposes

           Gross pollutant filter baskets in field inlet pits collection runoff from ground areas.
Refer to Appendix B for the stormwater management drawing.
4. 2       Co n stru cti o n Ph ase

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 4 below:
Table 4 – 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.

In addition to the degradation of receiving waters, impacts of inadequate erosion and sediment control
downstream from the site include:
           traffic safety problems;
           blocked drains;

           local flooding problems;




4 April 2019                                  Stormwater Management Report                                 10
S18-030                                          22 Arakoon Crescent,