Stormwater Mgmt Plan

SC-8407 – 45 Maple Street, Cooroy                                                                4



3.0 Stormwater Quality Management
3.1      Background
A requirement of the subject site is that Stormwater quality treatment shall be provided to meet the design
objectives set out in Section 2.4 of DERM’s Urban Stormwater Quality Planning guidelines 2010 and the
associated with State Planning Policy (SPP) 4/10 Healthy Waters. The scope typically encompasses the
‘post construction’ phase of the development however ‘construction phase’ water quality is briefly
addressed.


3.2      Construction Phase
Table 3.1 has been adapted from Table C4.1 of Brisbane City Council’s (BCC) Stormwater Best
Management Practices 2000 and details the typical stormwater pollutants which may be generated during
the construction phase of the development.


                     Pollutant                                       Sources

                         Litter                   Paper, construction packaging, food packaging,
                                                             cement bags and off-cuts
                     Sediment                    Unprotected exposed soils and stockpiles during
                                                             earthworks and building
                  Hydrocarbons                 Fuel and oil spills, leaks from construction equipment

                  Toxic Materials              Cement slurry, solvents, cleaning agents, wash waters

             pH Altering Substances                        Cement slurry, wash waters

                                    Table 3.1 - Typical Construction Phase Pollutants


         The following ESC measures should typically be implemented prior to the commencement of
         construction:
                 Education of all site workers in sediment and erosion procedures;
                 Specified storage areas for construction materials and plant that are bunded to prevent
                  any spillages from escaping.


         Table 3.2 illustrates the State Planning Policy objectives for construction phase stormwater quality
         that the erosion and sediment control plan to be submitted with the operational works approval is
         required to achieve.