Stormwater Management Plan MCU17/0014

Operations

EnviroPod units need to be regularly inspected           This section outlines the procedures for cleaning the
                                                         EnviroPod units. It has been written so that someone who
to determine whether they require maintenance
                                                         has never previously encountered a stormwater pit or an
or cleaning. This process involves several steps,        EnviroPod unit can carry out such maintenance by simply
and may require two or more maintenance                  following the outlined steps.
personnel working together, as well the use of
specialised equipment such as a hydraulic lifting
arm or an inductor truck with a vacuum hose.             3.1 Maintenance and monitoring of
                                                             EnviroPod filters
As gully pit grates are usually quite heavy, it is
important that correct lifting procedures are adopted,   To ensure that each EnviroPod unit achieves optimal
                                                         performance, the material collected by the filter bag should
and that the area surrounding the opened pit is
                                                         be emptied when the level of material is no more than
shielded from access to non-work personnel.              approximately half to two thirds of the total bag depth or
                                                         when there is evidence of material overflow. While the bag has
If inspection reveals that the filter bag needs to be    a greater storage capacity, it is recommended that it is not left
emptied and rejuvenated, the entire unit should also     to fill completely prior to emptying, for the following reasons:

be examined to ensure that all connections and joints    •   the bags are capable of retaining a heavy mass of material
are sound. Any material that has accumulated in the          (in excess of 50kg), which will make them more difficult to
                                                             lift and empty
overflow diversion channels or outlet pipes also needs
                                                         •   material near the top of the bag can be re-suspended
to be removed, with those areas then being flushed.
                                                             during high to extreme rainfall events
Where required, filter bags may need to be cleaned
                                                         •   blockage of the overflow sections can occur, when
or repaired, and all waste material must be disposed         material is allowed to build up above the filter bag.
of according to local guidelines at either an approved
                                                         It is also recommended that additional monitoring is
disposal site or transfer station.                       conducted following moderate to extreme rainfall events,
                                                         especially when preceding months have had little or no
                                                         rainfall. This increased frequency of monitoring is necessary
                                                         as there is a greater accumulation of surface contamination
                                                         during low rainfall periods, which will then enter the unit with
                                                         the higher volumes of runoff generated during a major rainfall
                                                         event. It is also important to ensure that the units have not
                                                         been damaged due to high pipe velocities.




8   Stormwater360 Operations and maintenance