Attachment 6 - Stormwater Management Plan and Engineering Response. · MCU23/0078

5.2.7   Proposed Treatment Train


        A ‘Treatment Train’ was developed to target each of the pollutants of concern using bio-retention systems to be
        incorporated into the development site layout. This treatment train is illustrated in Figure 3.




                                       Figure 3: Proposed Treatment Train (Entire Development)

5.2.8   Results


        The pollutant reductions for the ultimate developed phase of the site using bio-retention basins, with the inclusion of the
        detailed treatment train, as obtained from the MUSIC model and analysis are summarised in Table 29. below


                                  Table 29: Pollutant Removal Rates Discharge (Entire Development)
                  Pollutant                                  TSS (%)             TP (%)           TN (%)        GP (%)

                  Treatment Train Effectiveness                 81.4              70.0              62.7          97.3

                  WQOs                                          80.0              60.0              45.0          90.0



        As indicated in the table above, the removal rates for the target pollutants; total suspended solids (TSS), total phosphorus
        (TP), total nitrogen (TN) and gross pollutants (GP) are all above the water quality objectives stipulated in the State
        Planning Policy and Noosa Shire Council Planning Scheme. Therefore, the proposed treatment train for these areas will
        yield satisfactory pollutant removal.



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