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15 February 2018
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Toowoomba Second Range Crossing project update

Nexus-TSRC-Toowoomba-Second-Range-Crossing-east-zone-earthworks

While works are progressing well across the alignment, completion of the Toowoomba Second Range Crossing (TSRC) is expected to be delayed by four to seven months due to a complex geological issue in the project’s eastern work zone.

Nexus Infrastructure Chief Executive Officer, John Hagan said additional excavation is needed in a small section of the project after ground movement was identified in the geological layers below an embankment at Ballard.

“Despite extensive geotechnical investigations during the detailed design phase, the ground movement was caused by an ancient slip surface which is contained entirely within the project boundary and has no impacts outside the alignment,” Mr Hagan said.

“Active monitoring of the project’s cuts and embankments has been ongoing since construction began, and it was this monitoring that led to the identification of the issue.”

This part of the project in the Lockyer Valley is old volcanic land with challenging geotechnical conditions due to the effects of ancient volcanic lava flows and pre-Jurassic sedimentation formations that occurred between 25 million to 200 million years ago, and are now hidden deep beneath the ground’s surface.

“We have been carrying out intensive investigations alongside geological experts, design specialists and the Department of Transport and Main Roads,” Mr Hagan said.

“Working together, we have decided the best way forward is to carry out extensive earthworks at this location to remove the slip surface and construct the foundation of the embankment at a deeper level.

“While the project is progressing well, these additional earthworks will cause delay to the overall completion of the TSRC.”

The TSRC is a nationally significant project and a key component of the national freight network that will be operated and maintained by Nexus Operations for 25 years after the road’s completion.

“Nexus is committed to building a quality road for the transport industry that will provide a more efficient link between Melbourne-Brisbane and Darwin-Brisbane for Australia’s growing freight industry,” Mr Hagan said.

“As the TSRC will be of significant benefit to the national freight industry in its entirety, these additional works will occur alongside other scheduled activities so once complete, the rest of alignment can be linked to this section of the road.”

All other project works are progressing well and will continue as planned.

Nexus will update the community as soon as delays and construction impacts are fully known.

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