Development Application part 7 of 10 Stormwater Management Report - MCU13/0092

The overflow diversion channels, and the area between the Enviropod cage and    pit wall should also be
inspected for the accumulation of debris. Any observed debris should be removed and disposed of off-site.
Accumulated material within the outlet pipe may need to be flushed.


Note: If the units are not cleaned regularly the mobilisation of material collected in the Enviropod unit may

occur, as such cleaning of the units in accordance with this management plan is required. As this plan is based
on   observations and data collected during the monitoring period, ongoing adjustment of the cleaning
frequency is generally required to improve the overall efficiency in the removal of collected material and
prevent material overflow.




                                                Plate 25 Check joini
Plate 24 Check seals are pushed against the
                                                shown above)
pit walls




3.5 Filter Bag Inspection and Rejuvenation

Following the emptying and cleaning of the filter bags, the filter bag should be inspected to evaluate the bag
condition. Given the nature of stormwater the filter bag from some Enviropod units can become considerably

clogged with fine sediment. Filters can also be damaged by various objects in stormwater as well as fauna.
Sharp objects such as sticks combined with high velocity water and a large mass in the filter bag can cause
small tears in the filter material. Animals such as rats have also been known to chew through fine mesh filter
bags located in gully pits near takeaway food outlets.



3.5.1   Clogged Filters
Clogged filter bags can be clean using several different methods. If the bag cleaning techniques described in
the general maintenance sections above are not able to clean the filter bags the following options should be
considered:
     .
       Using a stiff brush and a bucket of soapy water scrub the filter bag surface.
     . Remove filter bags from the pit and wash the bags using a high pressure water spray. Care has to be


         taken to not transfer the contamination elsewhere. Waste water from the process should be collected
         of and disposed of correctly.
     .   Remove the filter bags from the pits and the support rings and wash the bags in an industrial washing
         machine.


The final option presented abQve typically results in th_e bags appearing like new, with no visible stain or pore

clogging within the filter mesh.




@2011 Stormwater360