Materials
* Fabric: polypropylene, polyamide, nylon, polyester, or polyethylene woven or non-woven fabric, at least 700mm in width and a minimum unit weight of 140gsm. All fabrics to 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.
* Support posts/stakes: 1500mm2 (min) hardwood, 2500mm2 (min) softwood, or 1.5kg/m (min) steel star pickets suitable for attaching fabric.

Installation
1. Refer to approved plans for location, extent, and required type of fabric (if specified). If there are questions or problems with the location, extent, fabric type, or method of installation contact the engineer or responsible on-site officer for assistance.
2. Install the fabric in a U-shape, extending the wing walls either up the side slopes and/or up the channel invert (as directed) to a point where the ground level is at least 100mm higher than the crest of the spill-through weir.
3. Ensure that the expected channel flow will enter the sediment trap, either by extending the wing walls up the bank slope, or constructing sandbag flow diversion banks.
4. Unless directed by the site supervisor, excavate a 200mm wide by 200mm deep trench along the alignment of the spill-through weir and wing walls.
5. Along the lower side of the trench, appropriately secure the stakes into the ground spaced no greater than 1m.
6. Construct the sediment trap from a continuous roll of fabric.
7. Securely attach the fabric to the support posts/stakes using 25mm staples or tie wire at maximum 150mm spacing with the fabric extended at least 200mm into the trench.  
8. Install a spill-though weir at the lowest point in the fence. The weir must be at least 300mm above adjacent ground level, and below the lowest ground level at the ends of the wing walls.
9. Securely tie a horizontal cross member (weir) to the adjacent support posts. Cut the fabric down the side of the posts and fold the fabric over the cross member and appropriately secure the fabric.
10. If directed, install a suitable splash pad immediately down-slope of the spill-through weir to control soil erosion downstream of the sediment trap.
11. Backfill the trench and tamp the fill to firmly anchor the bottom of the fabric and mesh to prevent water from flowing under the fence.

Maintenance
1. Inspect the sediment trap at least weekly and after any significant rain. Make necessary repairs immediately.
2. Repair any torn sections with a continuous piece of fabric from post to post.
3. When making repairs, always restore the system to its original configuration unless an amended layout is required or specified.
4. If the fabric is sagging between stakes, install additional support posts/stakes.
5. Remove accumulated sediment if the sediment deposit exceeds a depth of 150mm.
6. Dispose of sediment in a suitable manner that will not cause an erosion or pollution hazard.
7. Replace the fabric if the service life of the existing fabric exceeds six months.

Removal
1. When disturbed areas up-slope of the sediment trap are sufficiently stabilised to restrain erosion, the sediment trap must be removed.
2. Remove materials and collected sediment and dispose of in a suitable manner that will not cause an erosion or pollution hazard.
3. Rehabilitate/revegetate the disturbed ground as necessary to minimise the erosion hazard.