Attach G- Engineering Report

2.4.3   Major Maintenance: Sediment Removal & Cartridge Replacement (& Emergency)

Major maintenance/filter cartridge replacement typically involves the steps below. However, if it appears that
a spill of some type has occurred, the local hazard control agency and Stormwater360 should be notified
immediately. In the case of a spill, the worker should abort maintenance activities until the proper guidance
has been obtained. Depending on the configuration of the particular system, a worker may be required to
enter the vault to perform some tasks. If vault entry is required, OH & S rules for general confined space entry
must be strictly adhered to. Filter cartridge replacement should occur during dry weather and it may be
necessary to plug the filter inlet pipe if base flows exist. Standing water present in the vault should be
regarded as polluted and contained during this operation by temporarily capping the manifold connectors.


Steps For Cartridge Replacement Maintenance

1.      Depending on the particular unit, one or two utility workers and a hauling truck operator will deliver
        the replacement cartridges to the site. Information concerning how to obtain the replacement
        cartridges is available from Stormwater360.


2.      If applicable, set up safety equipment to protect pedestrians from fall hazards presented by open
        doors. Also, set up appropriate safety equipment for work near roadways.


3.      Inspect the external condition of the unit and take notes concerning defects/problems.


4.      Open the doors to the vault and allow the system to air out for 5-10 minutes.


5.      Without entering the vault, give the inside of the unit, including components, a general condition
        inspection.


6.      Make notes about the external and internal condition.


7.      Give particular attention to recording the level of sediment build-up on the floor of the vault, in the
        forebay, and on top of the internal components.


8.      Remove large loose debris and trash using a pole with a grapple or net on the end.


9.      Ensuring safe working procedures are met, off load the replacement cartridges (16-39kgs each) and set
        aside.


10.     Remove the top cap (threaded), upper seal and float from the cartridge. Repeat procedure for every
        cartridge within StormFilter vault. Place items in a large plastic container to be lifted form the vault.
        Note: * Confined space entry may be required on StormFilter systems. In this case, please ensure that
        appropriate Confined Space entry training and subsequent certification has been undertaken and
        valid, and work procedures are strictly adhered to. If you are unsure, do not enter the vault and
        contact Stormwater360 immediately.

11.     Using a cordless drill and 8mm hex head, remove the three screws located around the top perimeter
        of the cartridge hood. Place screws in the large plastic container and, once full or completed, remove
        plastic container form vault.

12.     Move the Vacuum truck near the StormFilter vault on the down wide side. Be sure that the Vacuum
        truck is not too close to the vault so as the fumes will not enter the vault. Make sure that the last
        500mm of the nozzle is approx. 100-125mm in outside diameter.



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