2015-08-18 Infrastructure and Services Committee Agenda

INFRASTRUCTURE & SERVICES COMMITTEE MEETING AGENDA                             18 AUGUST 2015


   Retain vegetation outside of the road footprint where safe and also endeavour to retain
     significant trees where possible
   Ensure afflux (raised flood levels upstream of the new road and culverts) is within
     reasonable limits for the properties affected

3.   Investigations in Progress

The following investigations are being carried out concurrently as part of the planning and design
process:
    Flood modelling and hydraulic design of culverts
    Geotechnical testing
    Flora and Fauna assessment
    Tree assessment
    Cultural Heritage assessment
    Erosion and sediment control management
    Traffic forecasting
    Service location and potholing
    Sourcing of pavement and embankment materials

4.   Issues

4.1. Optic Fibre Telstra Cable

A commercial optic fibre Telstra cable is located on the western side of Dr Pages Road, in
some locations it is within the proposed road footprint and will dictate the new road alignment
being located towards the eastern side of the road reserve to prevent major cable relocation
costs.

4.2. Sourcing of Road Pavement and Embankment Fill Materials

In order to minimise material and haulage costs and impacts of haulage trucks, arrangements are
being made to source sub-base crushed rock from Council's Ringtail Quarry as well as bulk fill
for embankment earthworks.

Options for supply of base-course crushed rock from Ringtail Quarry are also being investigated.
Top-course crushed rock will need to be sourced by the construction contractor from other
sources.

4.3. Artificially Elevated Flood Levels Due to an Existing unapproved Embankment in
     Private Property

A major problem has been found concerning flood levels predicted by modelling towards
the north western end of Dr Pages Road, as highlighted on attachment 1. It has been identified
that the levels are conflicting by about 1.8m with observed flood level markings and observations
of local property owners.

After considerable investigation, a possible cause has been traced to sections of earthwork
embankments resembling a levee constructed along the edge of Kin Kin Creek in Yalanga
Station.

The sections of embankment could have caused artificially elevated flood levels in other
private properties and Dr Pages Road for some time, resulting in disruption to the public using Dr
Pages Road due to prolonged and extended flooding, and extra maintenance costs to Council.

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