Appendix J - Civil Engineering Report and SBSMP

                                                                                   Noosa Residential Development
                                                                             Ref: 24553 C R002 REV03 10.08.21.docx
                                                                                                      August 2021

7.2.3    Construction Phase

         During the construction phase of the development, there is a risk of sedimentation transport due to
         disturbed land. The following erosion and sediment control measure will need to be installed in
         addition to the aforementioned measures (Pre-Development and Bulk Earthworks Phases) to ensure
         there is minimal disturbance and the quality of runoff is maintained to an acceptable standard:

            Construction of temporary diversion drains to divert water to sediment basins;
            Construction of temporary diversion drains to divert water to protect bioretention and treatment
            devices as required;
            Sediment barriers to be installed on all entrances to newly constructed stormwater infrastructure
            (i.e. gully pits);
            Sediment fences to be installed on the downstream side of any stockpiles and batters; and
            Re-vegetation of all disturbed areas within two (2) weeks of completion.

         All erosion and sediment control measures are to be designed and installed in accordance with Best
         Practice Erosion and Sediment Control" published by International Erosion Control Association
         (IECA). Further details regarding the proposed erosion and sediment control measures will be
         provided during the detailed design phase of the development.

7.2.4    Maintenance

         All erosion and sediment control devices are to be maintained through the entire phase of the
         development leading up to the operational phase. Erosion and sediment control devices will need to
         be monitored closely throughout the entire project to ensure they are operating correctly and
         efficiently. No erosion and sediment control devices are to be removed unless otherwise authorised
         by a suitably qualified engineer or the site superintendent.

7.3      Stormwater Quality Improvement Devices (SQIDs)
         A stormwater treatment train has been established to treat the runoff from the proposed development
         that includes the developable works area only (impervious carparking and units) and green space
         areas. The proposed treatment train will enable a higher level of pollutant removal efficiency by using
         stormwater quality improvement devices (SQIDs). Maintenance of the SQIDs will be the
         responsibility of the owners of the development. The maintenance should be carried out in
         accordance with the Council conditions of approval and Water by Design guidelines, such as Water
         by Design guidelines (2009) Maintaining Vegetated Stormwater Assets.

7.4      Operational Phase Treatment
         Once directed to be commissioned by the superintendent and engineers, the Stormwater Quality
         Improvement Devices (SQIDs) will provide the required level of stormwater quality treatment to runoff
         from the site prior to discharging into stormwater covenant and ultimately Council’s stormwater
         drainage infrastructure. It is expected that sediment laden runoff and the erosion potential at the
         subject site during the operational phase will be minimal. This is due to impervious developed areas
         in the form of roofs, driveways and carparking. It is understood that the footprint of these impervious
         areas has been reduced as much as practicable. The proposed landscaped areas will be maintained
         in a manner that will minimise erosion.

         Existing grassed and proposed landscaped areas will be maintained in a manner that will minimise
         erosion, some of which would be subject to erosion of topsoil from garden beds, erosion of soil from
         steep batters, etc.




BRISBANE / SYDNEY / MELBOURNE / GOLD COAST / SUNSHINE COAST / DARWIN / PERTH                              Page 17