Downhole geophysics on large scale roading projects: Definitely not a desk job


The challenge for NZTA is that large scale roading projects such as Transmission Gully are often in remote parts of the country, with very limited access.

Luckily, RDCL teams are well trained for remote field work, and bring practical experience from working on projects in the Philippines, Mozambique and Indonesia. Often, helicopters are used to carry equipment with personnel hiking to locations.


We provide crucial analysis for civil engineers through downhole geophysics, and have logged over 150 holes and over 3,000 metres of televiewer data.


Downhole tools comprise Optical Televiewer (OTV) and Acoustic Televiewer (ATV), Seismic CPT (SCPT) and Downhole Seismic testing. For further insight into ground conditions, we also use surface geophysics techniques.


We've been part of engineering teams for NZTA's Roads of Significance, including Transmission Gully, since 2012.