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

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sediment control measures to the satisfaction of the Superintendent and the Local Council.

The Contract documents include a drawing indicating suggested Sediment and Erosion Control
measures. Notwithstanding the detail shown on the drawings, the Contractor shall be solely responsible
for planning and managing the works to minimise erosion and silt migration from the site.

It is expected that control measures will include the following:

» Control over surface runoff by:
— construction of interception drains to divert runoff from undisturbed areas around the works area:
— installation of temporary drains;
- early stabilisation of floodways;

— use of straw bales, silt fences, swales, contour ploughing or ripping, dozer cleat impressions,
spreader banks.

» Limitation of movement of equipment and vehicles to:
~ asingle entrance of stabilised construction;
— prepared parking areas delineated by temporary fencing.
» Minimisation of the area exposed by:
— staging of clearing operations;
— progressive stabilisation of the works as completed;
= provision of temporary grassing;
- contour ploughing to disturbed areas.
» Construction of sediment control measures such as:
- sediment retention ponds;
— sediment basins;
— sediment traps;
- silt fences;
- buffer zones.
Where the control measures include sediment retention ponds:

» the ponds shall be kept empty of water for the longest possible duration;

» the Contractor shall remove and dispose of accumulated materials from the ponds as often as is
necessary to maintain their interception capacity at least at 90% of the design volume of the pond.

Specific erosion control measures shall include the following:

Protection of road formations

Road formations shail be protected from the effects of erosion and deposition. Earthworks shall be
graded to drain without ponding at all stages. Where runoff must cross the formation, the Contractor
shall ensure that the stream is a broad sheet flow that crosses roughly perpendicular to the alignment

41/22382/11840 Girraween Sports Precinct 22
Earthworks Package