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

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At all times the requirements of the Workplace Health and Safety Act shall be complied with and all
works shall be made safe during the performance of such activities.

During construction all care should be taken to ensure any water that may interfere with the progress of
the works shall be diverted to keep the trenches and excavations free from water so as to prevent any
damage to the works due to flooding or other causes.

The necessary pumping items shall be kept on hand to ensure the excavation is constantly dewatered
during the progress of the works.

5.3 Bedding

Pipes are to be bedded in 5-10mm crushed rock screenings. Bedding material shall be placed as
detailed on the design drawings and/or in accordance with Local Authority Standards.

Where soft unstable foundation material is excavated below the invert, backfill material shail consist of
gravel, crushed stone or other suitable material.

All material directly in contact with the pipe shall be within a pH range 4-9 and have a resistivity greater
than 500 ohm cms.

Select fill may be cement stabilised. Details of the proposed stabilised material shall be approved by the
Superintendent prior to installation.

The Bed Zone shall be placed to the final required thickness. The bed material shall extend over the full
width of the trench and shall be compacted by tamping, rolling and/or vibration to a minimum Density
Index (Dl) of 50.

Compaction achieved shall be monitored by field testing as directed by the Superintendent.

The bed leve! shall be graded to provide for a uniform fall to the discharging end of the pipeline, with line
and leve! as shown on the drawings.

For pipes with sockets protruding beyond the barrel outside surface, chases shall be dug into the bed
and foundation if necessary, in the appropriate positions, so that each pipe is supported along the full
length of the barrel and the socket is not subjected to point loading.

5.4 Laying and Jointing of Pipes

5.4.1 Concrete and Fibre Reinforced Concrete Pipes

Pipe laying shall begin at the downstream end of the line with the socket or grooved end of the pipe
facing upstream. When the pipes are laid, the barrel of each pipe shall be in contact with the bedding
material throughout its full length.

External joints shall be taped with the manufacturer's supplied tape or rubber external sand bands upon
final bedding and alignment.

Lifting holes in pipes shall be plugged with 3:1 sand cement mortar, precast tapered concrete plugs, tape

41/22382/11840 Girraween Sports Precinct 29
Earthworks Package