Attach G- Engineering Report

      3. Operations

This section details the specific activities required to clean the Enviropod units. Please note it has been written
for use by someone who has never encountered a stormwater pit or an Enviropod unit, providing a step by
step process for each of the cleaning stages.


3.1 Maintenance & Monitoring of Enviropod filters

To ensure that the unit performs optimally, the material collected by the filter bag should be emptied when
the level of material is no more than approximately half to two thirds of the total bag depth or when there is
evidence of material overflow. Although the bag has greater storage area, it is recommended that it is not left
to fill completely prior to empting, for the following reasons; the bags are capable of retaining a heavy mass of
material (in excess of 50kg); material near the top of the bag can be resuspended during high to extreme
rainfall events; and blockage of the overflow sections can occur, when material is allowed to build up above
the filter bag.

It is also recommended that additional monitoring should be conducted following moderate to extreme
rainfall events, in particular, when preceding months have had little to no rainfall. This monitoring is
considered necessary to accommodate for higher volumes of runoff generated during major rainfall events, an
anticipated greater accumulation of surface contamination during low rainfall periods and to ensure that the
units have not been damaged due to high pipe velocities.




3.2    Stormwater Pit Cover Removal

3.2.1 Hinged Pit Grates

To open a hinged pit grate follow the following steps:




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