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

or

5. Stormwater Drainage

5.1 Culverts and Pipework

Gully pits, pipe ends and grates shall comply with the requirements of the drawings and the standards of
the Local Authority and IPWEAQ.

Reinforced concrete pipes shall be of the class and joint type as shown on drawings. All pipes shall be
supplied and delivered in accordance with the requirements of AS 4058.

Installation shall conform to the requirements of AS 3725.

Fibre reinforced concrete pipes may be considered an alternative and shall conform to the AS 4139.
Pipes of the same diameter and class can be used in lieu of Reinforced Concrete Pipes. Where rubber
ting joints are specified the ‘V’ section rubber ring shall be used and is to be jointed using the
manufacturer's lubricant. Installation of FRC pipes shall be in strict accordance with the Manufacturer's
specifications.

Reinforced Concrete Box Culverts shall be of the ‘Inverted U’ type unless specified otherwise and shall
confomn in all respects to the current edition of AS 1597.

5.2 Excavation

The trench width for both trench condition and embankment condition shall be as shown on the
drawings.

For an embankment installation, the positive projection of the pipe shall be 0.9 times the pipe outside
diameter, or less. Where the projection of the pipe above natural ground surface is greater than 0.9
times pipe outside diameter, it will be necessary to construct the embankment to a height above top of
bed level at least equal to 0.1 times pipe outside diameter, prior to laying the pipe, and to a width equa!
to at least of 1.0 times pipe nominal diameter on each side of the pipeline trench wall.

The embankment shall be constructed in accordance with the specification for earthworks. A trench is
then to be cut through the constructed embankment.

The required trench for the installation, to the width and depth shown on the drawings, shall be
excavated centrally through the above compacted select fill material.

Excavation shall be to line and level shown on the drawings, to provide for a pipe bed zone, for the
following trench width and thickness:-

» 100mm for pipe nominal diameter < 1 500mm
» 150mm for pipe nominal diameter > 1 500mm

Should the excavation to the required foundation at the bottom of the bed evel reveal material, which in
the opinion of the Superintendent is unsuitable, the trench shall be over-excavated to a depth required to
remove the unsuitable material and refilled with compacted material conforming to the requirements for
the Bed Zone.

41/22382/11840 Girraween Sports Precinct 28
Earthworks Package