Attach G- Engineering Report

Treatment Train Specifications
Performance Specification

The stormwater filtration treatment train shall consist of ___ x 200 micron gully pit basket/s and ___ x
460/690mm passive, siphon-actuated, radial flow, self cleaning media filtration cartridge system/s operating at
a specific flow rate of not more than 1.5L/s/m2.

The gully pit basket system shall consist of the following components;

       Removable 200 micron Nylon monofilament Precision woven Filtration Bag;
       Fixed Galvanised Mesh Cage (no greater than 80mm x 80mm) around the Filtration Bag;
       Recycled modified ABS plastic to seal the unit into the pit; and
       By-pass mechanism above the Filter with no moving parts.
       System rigidly fixed to the walls of the pit.

The media filtration system shall be located within the following structure.

       Manhole;
       DownPipe;
       Linear;
       Vault;
       Large Box; and
       Detention.

Regardless of the system type, the media filtration system shall consist of the following components;

       Inlet energy dissipation;
       Cartridge section;
       Outlet section to bypass storm flows and convey treated stormwater;
       Access Lids in roof slab for access to Cartridges;
       Siphon actuated cartridges filled with proprietary ZPG™ filter media;
       Specific flow rate of each individual cartridge limited not to exceed 1.5L/s/m2 ;
       Air Lock Cap complete with one way Air Valve Flap;
       Outer Hood complete with Scrubbing Regulators;
       Automated high-energy turbulence on the screen face (only) at the end of storm flows to flush
        pollutants from the cartridge;
       Centre Drainage Tube complete with Buoyancy Float;
       Individual Cartridge Flow Restrictor Disc; and
       ¼ Turn Bayonet Fittings; and
       Under drain manifold to convey treated stormwater to the receiving environment.

The components of any proposed the treatment train or technology, including a gully pit basket upstream of
a radial flow cartridge filtration system, must be evaluated for a range of pollutants and these performance
expectations must comply with current best practice guidelines, ie Water by Design “MUSIC Modeling
Guidelines version 1.0 2010” for South East Queensland. In short, the performance evaluation of any system
must show;
     1. Any reduction efficiencies are justified by rigorous scientific testing as determined by an
         independent peer reviewer and the results further peer reviewed and published in a credible
         scientific journal. Any potential or perceived conflicts of interest should be disclosed within the
         published article.
     2. Published article providing insight into the pollutant composition (eg. soluble vs particulate for
         nitrogen) and the mean concentration of inflow and outflow to compare to local and or regional
         conditions.
     3. Performance evaluation undertaken in dry weather conditions OR a method to take into account
         any potential leaching of nutrients that may occur in the system(s).


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