Appendix D_Engineering Report

                                                                                                                                  HumeCeptor® system
Maintenance Procedure                                           It may be convenient on larger units to de-water some
                                                                of the relatively clean water from the central zone in the
Maintenance of HumeCeptor® is performed using                   treatment chamber. This will minimise maintenance
vacuum/eductor trucks this ensures that no requirement          costs as disposal of essentially clean stormwater can
for entry into the unit is necessary for maintenance.           be avoided. Often this can be done in either the sewer
The vacuum truck industry is a well-established sector of       or upstream of the pipe (position sandbags to create
the waste management industry cleaning underground              temporary storage). However, this should only be done
tanks, sewers and catch basins.                                 with the appropriate authorities consent.


A HumeCeptor® unit is cleaned by adhering to the
following steps:                                                Maintenance Cost

1.   Complete a Job Hazard Analysis (JHA) and a Work            The costs to clean out a HumeCeptor® will vary based
     Method Statement (WMS) before undertaking the              on the size of the unit, pollutant volume/type and
     maintenance procedure.                                     transportation distances.
2.   Prepare the site around the HumeCeptor® for
     cleaning. This involves establishing the job site          Economies of scale will be achieved where there are

     (traffic control if required), assembling cleaning         multiple units for a given location. The time to clean the
                                                                HumeCeptor® is approximately 30 minutes to an hour,
     equipment, positioning the vacuum truck and
                                                                excluding transportation and disposal.
     ensuring correct equipment is available to use
     (including PPE).                                           Disposal costs will vary greatly depending on local
3.   Remove the lid above the holding chamber and               authority requirements, the type of contaminants
     conduct a visual inspection to assess the condition        washing off your site and the availability of waste
     of the HumeCeptor® and note if there are any               disposal facilities.
     blockages or lodged debris
4.   Check for oil using a dipstick, tube or sampling device    It should be noted that these costs would be incurred
                                                                during the maintenance of any type or brand stormwater
     via the oil sample port.
                                                                quality structure and not just the HumeCeptor®.
5.   Remove and store any free oil separately using a
     small portable pump via the oil sample port:
     a.   Be sure to skim from the top of the water to
     ensure oil contaminants are removed
     b.   Approximately 300 mm of water should also be
     removed from the top of the water column
     c.   The oil/fuel waste can be disposed of
     separately, as this will incur a higher disposal cost
6.   Remove the sludge/sediment from the bottom of the
     HumeCeptor® using the vacuum truck:
     a.   The truck’s suction hose should be lowered into
     the sump of the device via the outlet riser
     b.   While extracting the waste, move the hose
     around in the opening to ensure that the hose
     is sucking from various locations in the sump to
     remove all the captured material
     c.   The extracted waste can usually be disposed of
     as general waste at a waste transfer station
7.   Clean the interior of the pit using water jet
8.   Replace lid, ensuring it is firmly and securely in place




                                                                                                         HumeCeptor® system   6