8. Volume 5 - Stormwater Management Plan

                                                  LAMBERT & REHBEIN
                                                    ENGINEERS • MANAGERS • SCIENTISTS


4.0     STORMWATER QUALITY

4.1     STORMWATER QUALITY OBJECTIVES
In accordance with the SEQ Regional Plan Implementation Guideline No.7 for Water Sensitive
Urban Design the required operational phase Water Quality Objectives (WQOs) are provided in
Table 9 below.
                       Table 9 Operational Phase Water Quality Objectives:
                                      Pollutant                      Pollutant Load
                                                                      Reductions
                        Total Suspended Solids (TSS)                     80%
                           Total Phosphorous (TP)                        60%
                              Total Nitrogen (TN)                        45%
                             Gross Pollutants (GP)                       90%



4.2     POTENTIAL WATER QUALITY IMPACTS
4.2.1   CONSTRUCTION PHASE

Potential exists during the construction phase of development for sediment (from exposed soil
areas and stockpiles) to become mobilised by stormwater. This results in suspended solids
entering waterways. Table 10 below details the typical stormwater pollutants which may be
generated during the construction phase of a development.
                          Table 10 Typical Construction Phase Pollutants

                      Pollutant                                            Sources
                                                        Paper, construction packaging, food packaging,
                         Litter
                                                                  cement bags and off-cuts.
                                                       Unprotected exposed soils and stockpiles during
                      Sediment
                                                                  earthworks and building.
                                                        Fuel and oil spills and leaks from construction
                    Hydrocarbons
                                                                           equipment.
                                                       Cement slurry, asphalt prime, solvents, cleaning
                    Toxic Materials
                                                                 agents and wash waters.
              pH altering substances                           Cement slurry and wash waters.



 Ref: B16239CR002                                           - 10 -                         Stormwater Management Plan
                                                                                        Noosa Energy Centre - Noosaville