24-7-19 Attachment F Rev Stormwater Mgmt Plan

18 July 2019


Maintenance of the bioretention basin will include:

          Routine inspections of surface profile to identify areas of sediment buildup, scour and
           erosion or clogging of the filter media;
          Routine inspection of the overflow pits and under drains for blockages and litter buildup;
          Removal of sediment where it is smothering the basin vegetation; and
          Repair all basin damage due to scour or erosion by replacement of filter media and
           vegetation.

A Bioretention Basin Maintenance Checklist is attached in Appendix 4.

Detailed maintenance techniques can be found in the Water By Design Maintaining Vegetated
Assets Guideline.

5.5       Construction Phase (Sediment and Erosion Control)

5.5.1 Intent of Erosion and Sediment Control Management Plan

To prevent stormwater contamination (of watercourses) and the release of contaminated
stormwater and wastewater by ensuring compliance with the Environmental Protection Act 1994
and Environmental Protection (Water) Policy 2009.


5.5.2 Implementation Strategy

Establish control measures and best practice approaches to prevent stormwater contamination
and minimise the risk and adverse effects of erosion and sedimentation. All Erosion and Sediment
Control measures must be designed, constructed and maintained in a manner that is
commensurate with the site’s erosion risk.


5.5.3 Erosion and Sediment Control Measures

          Obtain a licence or approval to operate activities that are classed as environmental
           relevant activities (i.e. they have the potential to cause environmental harm).
          Implement and maintain appropriate control measures to prevent sediment leaden
           wastewater and other potential pollutants such as oil, paint and wet concrete from entering
           the stormwater system via stormwater drains and gullies. The control measures which
           must be considered to be adopted are:
                Limit site access during construction to minimise disruption to traffic
                Install a temporary construction entry/exit sediment trap at all site accesses to
                   minimise mud and sediment from the site being tracked onto public road,
                   particularly during wet weather or when the site is muddy.
                Install and maintain appropriate sediment fences around construction areas
                        Divert clean stormwater runoff, using catch drains, around construction
                            areas to existing or new stormwater drainage system.
                        Install sandbags and other pollution containment devices around
                            stormwater drains and any other locations where required to prevent
                            sediment entering the trunk stormwater system.



Excellence with Economy in Engineering                                                                   16
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