06/1168 - Change a Development Approval [As Published] · 132006.1168.02

(2)

pipelines at shallow depths except at prepared crossing places and where approved.

For normal trench conditions the remainder of the trench shall be refilled to natural surface level with
ordinary fill material. It shall be placed evenly in 150mm to 300mm layers, and be tamped thoroughly.

The backfilling should be completed as soon as possible after pipe laying, and before the pipeline is
charged with water. This will avoid the risk of pipes floating if the trench becomes flooded.

Testing to confirm that the backfill has been compacted shall be carried out at the rate of at least 1 test
per 100 metres length of trench.

Refilling of sheeted trenches shall be carried out to the following requirements:

» No struts, waling or other supports shall be removed until the top of compacted refilling has reached
the level of these supports.

» No wall sheeting is to be totally removed from the trench until the level of the compacted refill is within
150mm of the surface.

» No wall sheeting is to be removed, in dewatered trenches, until the level in water table between
natural ground and natural refill material is less than 500mm.

» The wall sheeting is to be withdrawn or removed in such a manner that the pipe and compacted bed
and haunch support are not disturbed during such withdrawal or removal.

5.6 Intet Drains, Outlet Drains and Open Unlined Drains

Inlet and outlet drains and open unlined drains shall be formed for such lengths, widths, depths and
gradients as will ensure complete drainage, where shown on the drawings.

Catch drains to field inlets shall be constructed to the detail and in the locations shown on the drawings
and as directed by the Superintendent. The Superintendent may approve slight variations in alignment
where necessary to avoid natural obstacles such as large trees.

5.7 Concrete Kerbs and Kerb and Channel
The profites of the kerbs and kerb and channel shall comply with the details shown on the drawings.

The concrete kerbs and kerb and channel shall be laid on the compacted subbase gravel true to line and
tevels shown on the drawings. Subbase gravel pavement under the kerb and channel! shall be no less
than 100mm compacted thickness or as shown on the drawings.

The concrete used shall be Class N32 and its manufacture and placement shall comply with the
requirements of AS 1379 — Ready-mixed Concrete. Where a kerb and channel machine is used, the
maximum slump shall be 20mm and additional fines may be needed to produce a satisfactory result.

Kerbs and kerb and channel shall be constructed by means of an approved concrete extrusion machine.

Shortly after placing with the machine, the kerbs and kerb and channel shall be neatly grooved at 3m
intervals around the exposed faces of concrete. The groove shall be made with a trowel or similar tool to
a depth of 40mm into the newly laid concrete. The groove shall be perpendicular to the line of the kerb

41/22382/11840 Girraween Sports Precinct 31
Earthworks Package