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

on

shall be continuous longitudinally and continuous transversely.

Embankments shall be compacted to 95% relative dry density (standard compaction). Where the
material is sand is shall be compacted to a density index of not less than 70%.

The frequency of testing of embankments shall be in accordance with Table 8.1 of AS 3798 for large
scale operations.

3.4.5 Subgrade

Unsuitable Subgrade Material

Unsuitable and sensitive materials such as silt and or organic matter shall be removed from subgrades to
the extent directed by the Superintendent. Soft clay normally will not be regarded as being unsuitable
material.

Holes so formed shall be backfilled with selected fill from excavations, or imported select fill material.

Payment to the Contractor for the excavating and replacing unsuitable subgrade will be made only for the
extent of work agreed to by the Contract Administrator prior to the work being undertaken.

Roads

As compaction proceeds, the subgrade shall be shaped to the profile required, any making up required
being done by the addition of approved material. The surface of the subgrade shall be compacted,
trimmed, profiled and check tevelled prior to placing of pavement materials.

The alignment of any excavation for the pavement shall be such that the depth of the finished pavement
thickness is nowhere less than the dimension shown in the drawings.

The surface of the finished subgrade shall be graded to within the tolerance specified below in
accordance with the levels of the grade line shown in the drawing, or calculated from data given in the
drawings, due allowance being made for the thickness of the pavement required.

The Tolerances appropriate to the construction of subgrade and to subgrade replacement material shall
comply with the following:

» Design Level Tolerance +15 mm /-30 mm
» Shape Tolerance of 25 mm maximum deviation from a 3 m straight edge laid in any direction.

The crossfall of the surface of the finished subgrade shall be maintained within 12 mm of that shown on
the drawings.

The subgrade (top 300mm below subgrade level) shall be compacted to 100% relative dry density
(standard compaction) to a depth of 150 mm. The frequency of testing to confirm this compaction shall
be 1 test per 1,000 square metres of subgrade, with a minimum number of three (3) tests per sample
area being tested.

Where the subgrade material is sand is shal! be compacted to a density index of not less than 80%.

41/22382/11840 Girraween Sports Precinct 20
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