16-001014-02A (Ultimate SCMMP)

                                                                                                                                                  HumeGard® GPT
Independent verification testing

Laboratory and field testing of the HumeGard® GPT for
hydraulic performance and litter capture was conducted
in Australia by Swinburne University of Technology,
during 1996 and 1998.


Laboratory and field testing (Waste Management
Council of Victoria 1998, Trinh 2007, Woods 2005,
Swinburne University of Technology 2000) has proven the
performance outlined in Table 1 below.


Further field testing was conducted by the University of
the Sunshine Coast from 2013 to 2015 to determine TSS,
TP and TN removal efficiencies, which are also outlined in
Table 1 below.



Table 1 – HumeGard® GPT performance summary

   Pollutant                                 Removal efficiency                                         Details
   Gross pollutants                                    90%                     Annually
   (litter, vegetation)
   TSS                                                 41%                     Annually (including bypass)

   Hydrocarbons                                        90%                     In an emergency spill event

   TP                                                  34%                     Particulate-bound

   TN                                                  24%                     Particulate-bound
Notes:
1.   Nutrient removal is influenced by individual catchment characteristics and partitioning between dissolved and particulate nitrogen.
2.   For further details on performance testing contact Humes Water Solutions.
3.   Gross pollutant traps are not specifically designed to capture hydrocarbons, though may do so during emergency spill events. When this
     occurs, maintenance is required immediately.
4.   The unique design of the HumeGard® floating boom allows it to be modified to treat higher flows and capture more gross pollutants and
     sediment on request.




                                                                                                                             HumeGard® GPT    3