4 National 

The 4 National project involved the construction of a large multi-storey office building and a four-level basement car park.

The site’s geology comprised underlying bedrock, mostly dipping beds of very strong calcareous siltstone and limestone. A north-south aligned fault running through the middle of the site resulted in a sheared zone of very weak rock, as well as strong groundwater flows.

We provided:

  • a temporary support solution of the deep basement excavation, and 
  • careful consideration of the footing system in the weak faulted rock area.
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“ACT Geotech have always provided exceptional geotechnical engineering advice at a competitive price. They are responsive to our needs and have always been able to conduct their investigations and provide reports in a timely manner.”

Paul Farrell

Farrell Management

ACT Geotechnical Engineers have proven to be a very reliable geotechnical consultancy in the region, offering sound advice in an enthusiastic and very responsive manner, which is appreciated and favoured by clients.

Don McInnes

Sellick Consultants

“ACT Geotech were able to use their technical expertise to enable the footing system to be optimised, significantly saving the client both time and money on the project.”

Alan Schmeier


“We have worked with Jeremy and his geotechnical engineers on many projects over the last 10 years and are always pleased with their responsiveness, thoroughness, and ability to find flexible and efficient solutions for our engineering needs.”

David Jackson