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

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surrounded, or other approved means prior to backfill material being placed.

Joints shall not be made under water. The trench must be dewatered to facilitate joint making and
inspection. Precautions must be taken to prevent erosion of joint material by moving currents of water.

Drainage lines shall be constructed with a tolerance of 10mm in line or level over any section 30m in
length (providing each pipe unit has a fall in the direction of flow) from the alignment and levels shown on
the drawings.

All concrete used in drainage works shall, unless otherwise specified or shown on the drawings, be
Class N25 concrete in accordance with AS 3600.

§.4.2 Reinforced Concrete Box Culverts

The base of the box culvert shall be laid true to line and grade before the upper U Portion of the box
culvert segments are laid.

All construction methods, tolerances and requirements for box culverts shall conform to the requirements
detailed in Queensland Transport Standard Specification MRS 11.03.

5.5 Backfilling

5.5.1 Backfill

Unless shown otherwise in the construction drawings, backfill material shall generally be selected fill
material, not markedly different in character from the surrounding soil and free from large stones, lumps
of clay, topsoil, tree roots and other rubbish. It shall have an even grading free of lumps retained on a
75mm sieve and free of stones retained on a 25mm sieve.

§.5.2 Concrete and Fibre Reinforced Pipes

Backfilling requires great care, and lack of attention to its selection, placement and compaction may lead
to damage to a new pipeline or to other underground services adjacent to the pipeline or to neighbouring
structures. The trench should be backfilled as soon as possible after pipes are laid.

Compaction standards for Backfill material shall conform to the following requirements. The level of
compaction required shall be as follows:

Note: Compaction requirements are with reference to the relevant Test Methods
contained in AS 1289.

For trench installations, mechanical compacters shall be used. Where impact tampers are used, caution
must be exercised not to allow a direct blow on the pipe. The material should be compacted at near
optimum moisture content and should be brought up evenly in layers not exceeding 150mm on both
sides of the pipe up to 150mm over the pipe. It should not be bulldozed into the trench nor dropped
directly on the pipe.

Heavy mechanical equipment must not be used for tamping of backfill or be permitted to run over

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