Appendix D_Engineering Report

    Inspection Procedure                                           4.    To empty the Sludge Judge, touch the check valve pin
                                                                         against a hard surface; this opens the check valve
    HumeCeptor® units are generally sized such that they                 allowing the contents to drain out.
    only require maintenance (cleaning out) on an annual
    basis. This being said, it is difficult to know what           Oil Sampling
    the actual pollutant loading rate from the particular
                                                                   A similar procedure for using the Sludge Judge applies for
    catchment that the HumeCeptor® services might be
                                                                   checking the oil level in the HumeCeptor®, except in this
    (how much pollution enters the device in a given time
                                                                   instance the device is used through the oil clean out port
    frame). Therefore, the manufacturer recommends that
                                                                   rather than the outlet riser.
    the HumeCeptor® should be monitored on a 3 monthly
    basis, which will assist in determining the actual need for    1. Lower the Sludge Judge into the oil clean out port
    maintenance.                                                         of the HumeCeptor® to a depth of 1 to 1.5 meters
                                                                         below the fibreglass insert.
    The following procedure can be used to inspect the
    HumeCeptor® and determine the levels of sediment and           2. When at the required depth tug slightly on the rope
    hydrocarbons (oils) in the device.                                   to set the check valve trapping the mixture inside.

    1.   Locate the HumeCeptor® - all units have a 600mm           3. When the Sludge Judge has been raised clear of the
         diameter cast iron lid embossed with“HumeCeptor®”               HumeCeptor®, the amount of oil in the device can be
    2.   Use the Gatic lifter to remove the lid                          read using the markers on the clear pipe section.
    3.   Conduct a visual inspection of the inlet and outlet
                                                                   4. To empty the Sludge Judge, touch the check valve pin
         pipes to ensure there are no blockages
                                                                         against a hard surface; this opens the check valve
    4.   Conduct a visual inspection of the fibreglass insert
                                                                         allowing the contents to drain out.
         and check for damage; also check for obstructions in
         the orifice
                                                                   The depths of the sediment and hydrocarbons should
    5.   Identify the location of the oil clean out port and the
                                                                   be recorded. The HumeCeptor® will require a clean out
         outlet riser
                                                                   when either the sediment or oil levels in the device reach
    6.   Use the Sludge Judge to determine the levels of
                                                                   the depths outlined in Table 2 below.
         sediment and hydrocarbons in the device
                                                                   It should be noted that for an STC2 model HumeCeptor®,
    The HumeCeptor® is designed to capture and retain              a screw cap will need to be removed to access the Oil
    sediments and hydrocarbons, therefore, two samples will        Clean Out Port. Ensure that the cap is replaced when
    need to be drawn from the device by using the Sludge           work is completed.
    Judge. The Sludge Judge is used in the following manner:


    Sediment Sampling
                                                                   Table 2 – Sediment depths indicating maintenance
    1.   Lower the Sludge Judge into the outlet riser of the
         HumeCeptor® all the way to the base of the unit; the       Model       Max Oil Depth      Max Sediment Depth
                                                                                   (mm)                  (mm)
         float valve will open allowing materials to flow in. It
         should be lowered in slowly and not plunged to the
                                                                        STC2          350                   200

         bottom.
                                                                        STC3          450                   350

    2.   When at the bottom of the unit the clear pipe of
                                                                        STC5          450                   600

         the Sludge Judge will be filled to the top of weir             STC7          450                   850

         level with water (and sediment at the bottom). Tug             STC9          850                   600

         slightly on the rope to set the check valve trapping       STC14            1150                   700

         the mixture inside.                                        STC18            1050                   600

    3.   When the Sludge Judge has been raised clear of the         STC23            1050                   700

         HumeCeptor®, the amount of sediment in the base            STC27            1150                   750

         of the device can be read using the markers on the
         clear pipe section.




5   HumeCeptor® system