Swmp

         •      Where possible maintain existing landscaping/grasses downslope from construction areas
                to act as buffer/silt trap.
         •      Install temporary downpipes from completed roof structures and ensure runoff passes
                through silt fences.
         •      Minimise concentrating surface flows.
         •      Place silt barriers around council stormwater pits that the site drains to.
         •      Cover soil stockpiles with hessian or similar.



5.3      Completed Development


We are proposing to use a combination of active and passive stormwater treatment measures. Active
measures will include bio-retention basins a water storage tanks for re-use and passive measures via
gross pollutant inserts into stormwater pits within paved areas that receive runoff from areas prone to
gross pollutants.

For the proposed development we have proposed incorporate Water Sensitive Urban Design (WSUD)
principles stormwater harvesting has been proposed for stormwater re-use for communal landscaping.
The proposed water re-use tank has been sized in accordance with the Sunshine Coast Council Flooding
and Stormwater Management Guidelines adopting 1kl per 25m2 of communal landscaping area water
tank for stormwater re-use have been incorporated into the proposed development.

5.3.1    Water Quality Objectives
Water quality objectives for South East Queensland are outlined in the State Planning Policy 2017 and
are displayed in Table 5.1. These reductions are achieved by adopting best practice techniques in
accordance with the abovementioned guidelines.

                               Table 5.1: Minimum Mean Annual Load Reductions

              POLLUTANT / ISSUE                    MINIMAL MEAN ANNUAL LOAD REDUCTIONS

          Total Suspended Solids (TSS)                                     80%

             Total Phosphorous (TP)                                        60%

               Total Nitrogen (TN)                                         45%

              Gross Pollutants (GP)                                        90%




SCG Consulting Engineers                      Page 9                                  SCG Ref: 33132(SWMP)