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

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are to be constructed is unsuitable, such material shall be removed and replaced by approved fill
material.

Any soft or saturated areas shall be surface drained.

Fill Material

Only material approved by the Superintendent shall be used from cuttings in the construction of
embankments. Generally the material used shall comply with the following:

Maximum particle size 75mm

Percentage passing 0.075mm Not greater than 25%
Liquid Limit Not greater than 40%
Plasticity Index Not greater than 15%

For sand material the figures above and do not apply. Sand fill material shall be approved for use by the
Superintendent and shall be free of all deleterious material listed below.

Borrow pits and cuttings shall be so worked that the best material available, in the opinion of the
Superintendent is made to form the upper layers of embankments.

All materials used in embankments shall be to the approval of the Superintendent.

Materials which are not to be used in embankment construction are vegetable matter, organic clays and
silts, ashes, coal or the like, free draining material susceptible to scouring, dispersible clays, material
which is unstable when subject to moisture variation.

Embankments

Filling shall be carried out in uniform horizontal layers of not more than 200 mm of loose material and
compacted as specified. For sand material a maximum layer thickness of 300 mm is applicable.

Each layer shall be free of ruts before successive layers are placed. During construction the surface of
the embankment shall be shaped so that it is kept higher at the edges, sloping towards the centre to
permit safe passage of hauling, rolling and other construction equipment as close to the edge as possible
and to ensure that the edges are compacted to the same density as the other parts of the embankment.
At the close of work each day, the surface shall be shaped to a crown in the centre to ensure that the
surface is well drained.

During construction, the differential level of adjacent layers across the embankment shall not exceed
600 mm.

Where the ground surface on which an embankment is to be constructed has a transverse slope steeper
than 1 on 8 a horizontal step not less than 300 mm high shall be cut into the ground surface at the toe of
the batter on the low side.

Where the ground surface has a transverse slope steeper than 1 on 3 a series of horizontal steps not
less than 300 mm high shall be cut into the ground surface covered by the embankment. These steps

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