RFI - Attachment 3 - Stormwater Management Plan

6.4 Summary Product Collection Efficiency Data
In recent years modern Water Sensitive Urban Design (WSUD) objectives and
principles now applied to most urban development’s require more onerous water
quality objectives (WQOs) specifically targeting the removal of suspended solids,
nitrogen, phosphorus and heavy metals. The Ecosol™ Litter Basket is an integral
part of the treatment train providing essential pre-screening of stormwater flows,
and when used in conjunction with other treatment measures such as swales or
sand filters will achieve target water quality objectives.


                                                       Capture Efficiency (Up to)   Capture Efficiency (Up to)
     Performance Criteria1
                                                          (200µm Filter Bag)          (1500µm Filter Bag)

     Gross Pollutants (>600μm)                                   97%                          77%

     Total Suspended Solids (TSS) (20 - 600µm)                   41%                          15%

     Total Phosphorous (TP)                                      39%                          15%

     Total Nitrogen (TN)                                         11%                           4%

     Heavy Metals                                                6%                           2%

     Total Petroleum/Hydrocarbon                                 20%                           7%



1 Figures quoted are mean collection efficiency statistics based on available
product testing data. It is important to note that the water quality CE values are
indicative of potential field CEs given that Ecosol™ Litter Basket provides physical
screening and the removal of chemical constituents is therefore largely dependent
on the chemical composition of the particles and the bonding of these chemical
constituents to the surface of the particles.

                                                 6.5 Products Options
                                                 To enhance the product capture efficiencies other filter medias can be incorporated
                                                 into the design.

                                                 Hydrocarbon booms installed within the Ecosol™ Litter Basket will provide
                                                 additional protection against oil or fuel spills in wet conditions.


                                                 Reactive filtration media pillows installed at the base of the basket will provide
                                                 improved capture efficiencies for heavy metals, total nitrogen, total phosphorous,
                                                 turbidity and suspended solids.




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