Scope

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Installation of desalination plant pipeline infrastructure using
HDD, including three parallel 660m bores for seawater
intake and a 965m pilot hole for the outfall pipeline.

 

Challenges

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The works required precise bore alignment beneath the
seabed, including accurate pilot drill exits into casing
installed from a jack-up barge. GPS track, real-time gyro
measurements and expert steering were used to verify
trajectory and maintain positional accuracy throughout the
crossings.

 

Outcome

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All four pilot bores were completed successfully, enabling
installation of the desalination plant pipelines. The works
were completed ahead of time and support a more reliable
drinking water supply for the Onslow area.