Stormwater Management Plan MCU17/0014

 Photo 25 Slightly clogged filter bag, indicated by the brown         Photo 26 A clean used filter bag
 stain on in the centre of the bag


3.5.2 Damaged filters                                                3.6 Disposal of material
Damaged filter bags can often be repaired, provided the              All gully pit wastes are to be taken off site and disposed
damage is small. Small tears in the fabric may occur due to          of at a transfer station or similar approved disposal site.
several reasons, however the overall strength and structure          Stormwater sediments can contain lead, copper, zinc,
of the nylon fabric typically prevents small tears becoming          mercury, hydrocarbons and PCBs, which are harmful to
much larger. Although the bag is unlikely to tear further, care      both humans and the receiving environment. Appropriate
must be used when cleaning torn bags so as not to spill the          sampling and laboratory analysis may be required to
collected material into the pit.                                     classify the material as suitable for reuse, or disposal under
Small tears may be repaired by either sewing the tear back           appropriate local guidelines.
together with additional fabric to increase the strength of the
stitching, or by sewing a patch of the filter material onto the
filter bag. If large tears are present, the filter bag may need to
be replaced as it is no longer able to function as intended.




                                                                                           Stormwater360 Operations and maintenance   15