Materials
* Fabric: polypropylene, polyamide, nylon, polyester, or polyethylene woven or non-woven reinforced fabric. The fabric width should be at least 700mm, with a minimum unit weight of 140gsm. Fabrics should contain ultraviolet inhibitors and stabilisers to provide a minimum of 6 months of useable construction life (ultraviolet stability exceeding 70%).
* Fabric reinforcement: wire or steel mesh minimum 14-gauge with a maximum mesh spacing of 200mm.
* Stakes: minimum 1500mm2 (min) hardwood, 2500mm2 (min) softwood, or 1.5kg/m (min) steel star pickets.
* Timber cross members: 50 x 100mm timber or equivalent.
* Aggregate: 15 to 25mm crushed rock.

Installation
1. Refer to approved plans for location and dimensional details. If there are questions or problems with the location, dimensions or method of installation contact the engineer or responsible on-site officer for assistance.
2. Ensure that the installation of the sediment trap will not cause undesirable safety or flooding issues.
3. Where possible, excavate a 200x200mm trench around the inlet structure.
4. Space stakes evenly around the perimeter of the stormwater inlet at a maximum 1m spacing, and securely drive them into the ground.
5. Where necessary, install a horizontal spill-through weir to limit the maximum height water ponding around the structure.
6. Ensure the maximum pond height will not cause a safety hazard, including undesirable flooding of an adjacent property or roadway. Wherever practical, the spill-through weir should be at least 300mm above ground level.
7. If a spill-through weir is not installed, then frame the top of the stakes with horizontal cross members.
8. Cut fabric from a continuous roll to eliminate joints.
9. Place the bottom 300mm of fabric in the excavated trench.
10. Securely fasten the fabric to the stakes and cross members. At the fabric joint, overlap the fabric to the next stake.
11. Backfill the trench with at least 200mm of aggregate or compacted soil. If a trench cannot be excavated, lay the bottom 300mm of fabric evenly on the ground surface and cover with a 300mm layer of aggregate, not earth or soil.
12. Where required, install a flow control bund to maintain the specified pool depth and control the movement of water.
13. Take all necessary measure to minimise the safety risk caused by the structure and to prevent unsafe entry into the stormwater inlet.

Maintenance
1. Inspect the sediment trap after each runoff-producing rainfall event and make repairs as needed to the sediment trap and associated flow control bunds.
2. Remove collected sediment and dispose of in a suitable manner that will not cause an erosion or pollution hazard.
3. Sediment deposits should be removed immediately if they represent a safety risk.

Removal
1. When the up-slope drainage area has been stabilised, remove all materials included deposited sediment and dispose of in a suitable manner that will not cause an erosion or pollution hazard.
2. Bring the disturbed area to a proper grade, then smooth, compact and stabilise and/or revegetate as required.