Geotechnical services


Sonic rigs are ideal for use in environmental investigations as they have the ability to:

  • drill straight holes
  • install continuous, multi-chamber well tubing
  • drill and core through landfill debris
  • drill angled holes
  • drill without using drilling mud
  • drill any broken or saturated soils or alluvium material
  • perform many other types of environmental, drilling-related operations with exceptional core recovery.


These core samples are extruded into clear plastic sleeves, which minimises the loss of volatile organic compounds and reduces the risk of operator exposure to in-ground contaminants. The clear plastic sleeves also allow field screening devices to provide immediate soil chemistry information. Core samples can then be subjected to a detailed visual examination and analysis, followed by photographing, sampling and archiving for a permanent record of existing soil conditions. This allows the creation of an accurate description of the stratigraphy and lithology of the underlying geological setting.

How the sonic drill works
The sonic drill is outstanding in its ability to provide continuous, highly representative and relatively undisturbed core samples through any geological formation, including boulders and bedrock. Coring, in overburden material, is performed as a mostly dry process, producing core samples that range from 3-8˝ in diameter. All core samples are large enough to provide duplicate samples.

The sonic head is based upon the principle of high-frequency vibration. The hydraulic motors on the exterior of the head oscillate offset internal weights at speeds reaching 5000rpm. As a result of the weights being offset, it creates a vibration in excess of 140hz.


An example of our neatly packaged and labelled sample boxes • SPT sample casing and sonic tools