Stormwater Management Plan · MCU15/0122

                                                                                           15099 - SBSMP/3
                                                                                                         Page 17




6.2 Operational Phase
The proposed development involves the development of land greater than 2,500m2.
Consequently, State Planning Policy 2014 (SPP 2014) is triggered.

Water quality objectives (WQO’s) for South East Queensland as set out in the Urban Stormwater
Quality Planning Guidelines 2010 should be achieved by identifying and adopting best practise
techniques in accordance with the abovementioned guidelines. Refer to Table 6.2 for target
WQO’s.

                          Table 6.2 – Minimum Mean Annual Load Reductions

                                                             Minimum Mean Annual
                                    Contaminant
                                                                Load Reductions

                            Total Suspended Solids (TSS)              ≥ 80%
                               Total Phosphorus (TP)                  ≥ 60%
                                Total Nitrogen (TN)                   ≥ 45%
                               Gross Pollutants (GP)                  ≥ 90%




6.2.1 Sources of Contaminants
Potential sources of contaminants and stormwater quality improvement devices identified for
the operational phase of the development are outlined in Table 6.3.

     Table 6.3 - Sources of Contaminants

                                                Pollutant
              Target Pollutant Type                               Acceptable Treatment Examples
                                                  Size

        Primary        Screening of gross                       Litter baskets, swales, buffer strips,
                                                >5000um
       Pollutants          pollutants                            GPT’s, rainwater tanks with re-use
                        Sedimentation of
       Secondary                                125um -        Swales, sedimentation basins, ponds,
                        coarse to medium
       Pollutants                               5000um             rainwater tanks with re-use
                            sediment
                           Enhanced                             Bio-retention basins, constructed
                                                 10um –
                      sedimentation of fine                    wetland macrophyte zones, other bio
                                                 125um
                          particulates                                    technologies
        Tertiary     Adhesion and filtration
                                                0.45um –      Constructed wetland macrophyte zones,
       Pollutants    of very fine / colloidal
                                                  10um                other bio technologies
                            sediment
                       Biological uptake of                   Constructed wetland macrophyte zones,
                                                <0.45um
                        dissolved particles                           other bio technologies




Site Based Stormwater Management Plan
Proposed Medical Development at Cnr Val Crescent & Goodchap Street, Noosaville