Client name: Transport for NSW

Duration: 2011 - 2015

Location: Sydney, New South Wales, Australia

Successful delivery of complex, large scale geotechnical and contamination assessment services on time and within budget.

The North West Rail Link or the Sydney Metro Northwest as it's now known is the first stage of the Sydney Metro system Australia’s largest public transport infrastructure project and first fully-automated rapid transit rail.

The site investigation presented significant challenges in an urban environment. Careful management of numerous subcontractors and detailed negotiations with stakeholders was required.

Our geotechnical interpretive report was required in tight timeframes and needed to effectively identify the geotechnical risks facing the project.

Extensive geotechnical investigations made possible thanks to community engagement and negotiations

Community support was essential to ensure the completion of initial site investigations. We identified areas of potential community concern prior to mobilisation and allowed for focussed and positive discussions. As a result, we successfully negotiated investigations at locations that would otherwise have been impossible to access.

We managed tight timeframes by mobilising a large pool of experienced field personnel and subcontractors, together with our extensive in-house capability. Our team completed more than 200 boreholes, 50 test pits, in situ testing (including rock stress testing), geophysical surveying and pressuremeter testing, together with an extensive laboratory testing program.

We worked with the NWRL Integrated Project Team to develop geotechnical models and design parameters for surface and underground construction and provided advice on tunnelling, retaining structures, earthworks, pavements and foundations, contamination and groundwater assessment.

Geotechnical risks and opportunities uncovered

High quality site investigation data was delivered within a tight time frame to ensure geotechnical risks and opportunities were highlighted early in the planning and concept design process.

Our involvement with the Integrated Project Team and close liaison with the project’s design, property and community teams meant potential impacts were mitigated through collaborative changes to the project design.