SCG 31131(SWM).RevB - REceived 3.3.22.pdf

5.2        Construction Phase


Sediment generated during the construction phase shall be controlled in accordance with a site specific
Erosion and Sediment Control (ESC) Plan and kept on site throughout construction.



5.2.1      Silt and Sediment Erosion



A potential for sediment mobilisation/transportation exists during and beyond the construction of the
proposed development. This can elevate turbidity levels of stormwater runoff.



A RUSLE assessment of the site confirms proposed development is a Low Risk for soil loss (< 150
Tonnes).



Potential Causes



           •    Stormwater scour and erosion of excavated or stripped surfaces and stockpiled soils.
           •    Wind borne transportation of sediments.
           •    Disturbance/breakup of soil profile via vehicular traffic followed by stormwater scour
                and erosion.
           •    Transportation of sediments from site via excavation vehicles.



Mitigating Measures



           •    Construction of silt fences around the development site located to cut off all runoff.
           •    Construction of a sediment basin throughout construction at a low point of the
                development site.
           •    Provide 80-100mm crushed rock (no fines) hardstand under all vehicle paths expected
                during construction. Generally, this would be provided from the existing crossover and
                extended to a distance within the site that would accommodate the maximum delivery
                vehicle length expected.

SCG Consulting Engineers                    Page 9                             SCG Ref: 31131(SWMP).RevB