Maintenance Schedule
The internal components of the Downstream Defender® are designed not only to enhance the removal process, but also to isolate the captured pollutants from the treatment flow path to prevent pollutant re-entrainment. Man entry to the chamber is not required at any time as all inspection and maintenance can be conducted from the surface. The purpose of an effective maintenance program is to ensure that the Stormwater is being collected and directed through the Downstream Defender® and to ensure that pollutant accumulations do not exceed the storage capacity of the unit.
Inspection and maintenance requirements will differ from site to site depending on catchment, rainfall and pollutant loadings, however a typical maintenance schedule is given in the table below:
| Activity |
Frequency |
| Inspection |
Inspect for evidence of poor operation |
At site hand-over then every six months |
| Inspect sediment and floatables accumulation rates and establish removal frequencies |
Regularly during first year of operation, then every six months or as required |
| Regular Maintenance |
Sediment Removal |
Annual or as required |
| Floatables Removal |
Annual or as required |
| Remedial Action |
Sediment Removal |
Following spill in drained area |
| Floatables Removal |
Following spill in drained area |
Accurate inspection and maintenance records should be maintained.
Note: For most installations, sediment and associated pollutants are considered Hazardous Waste. This imposes a Duty of Care on the waste producer to notify the Regulator of movement or disposal of waste and to ensure that the waste is stored, transported and disposed of in an appropriate manner. Chemical analysis of captured pollutants may be required and / or beneficial for high risk sites or following a major pollution event or spill.
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