Att8 - SWMP

     •    Stabilised disturbed areas – Once an area is no longer actively under construction, the exposed surfaces are
          to be stabilised through means such as control matting, grass seeding or turfing. Both temporary and
          permanent stabilisation need to be considered.

     •    Protection of channels – where water is concentrated through channels, drains or other flow paths these
          areas should be stabilised (e.g. check dams to limit velocity, geotextiles to limit erosion, concrete lining, etc.)
          with either temporary or permanent solutions.

     •    Divert upstream flows – clean run-off from upstream areas is to be diverted around disturbed areas to prevent
          contamination of the clean water and minimise loss of exposed soils from the site. Catch drains, swales or
          sand bag berms may provide suitable diversion barriers.

     •    Maintenance – Regular inspections shall be carried out on all erosion and sediment controls, and where
          damage has been identified, or capacity of the device falls below 75%, prompt rectification of the defect
          shall be carried out to ensure the continued functioning of the controls.

As the area being developed exceeds 2,500m², the development’s construction will be required to achieve the
sediment control targets to treat 80% of the average annual run-off volume of the contributing catchment as outlined
of Appendix 2 of the SPP (DERM, July 2017), shown below in Figure 4-1.




                     Figure 4-1 SPP 2017 Construction Phase Stormwater Management Design Objectives

A site-specific erosion and sediment control plan shall be prepared as part of a future submission for Operational
Works approval for the development. Suitable erosion and sediment controls for the site may include:

     1. Provision of on-site sedimentation basins downstream of works area to reduce sediment concentrations from
        site before being discharged into the waterway.

     2. Sediment fencing along downstream of the work areas within the site to prevent sediment from leaving the
        construction area.

     3. A shakedown area is to be installed at the construction entry/exit to the proposed development area to
        minimise sediment being transported to and from the site.

     4. Ensuring any stockpiles and construction materials are located clear of overland flow paths and contained
        using sediment fencing downstream of these areas with upstream diversion berms to protect the stockpile.
Project number 20220146                                                                                    Page 11 of 20
File RECOR Stormwater Management Plan- 20220146.docx, 2022-09-06 Revision 0

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