RFI - Attachment 3 - Stormwater Management Plan

A minor service, which can be carried out by hand or with the assistance of a vacuum unit, consists of:
     1. Filter basket inspection and evaluation.

     2. Removal of captured pollutants.
     3. Disposal of material.
Based on the routine inspection, a major service shall be carried out on an as needed basis. This will be required
where tears or other damage to the filter bag is observed, or an inspection of the components finds damage. The
major service consists of

     1. Filter basket replacement
     2. Support frame rectification.

Additional maintenance may also be required where there has been a hazardous material spill, the system is
experiencing blockages, or following major storms and flooding.




     4.2. Construction Stormwater Management

          4.2.1 Erosion and Sediment Control Measures
During construction, it is necessary to manage stormwater run-off to avoid potential contamination of downstream
waterways from sediments and other pollutants from the site. A range of best practice sediment and erosion controls
should be implemented on the development to ensure negative impacts to the downstream receiving environment
are mitigated. The erosion and sediment control strategy should be based on the following key principles

     •    Minimise the disturbed area – The clearing of land should be limited to areas actively under construction or
          those that will be in the near future (3 to 6 months)

     •    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 4.7.




Project number 21020                                                                                      Page 24 of 36
File RECOR Concept Stormwater Management Report - 21020.docx, 2022-09-05
Revision 0


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