Transmission Gully

Transmission Gully – Opus (Nov 2007, ongoing)

Transmission Gully is the biggest road construction challenge in the Wellington region. The aim is to relocate State Highway One away from its narrow coastal route to a new inland route with sufficient room.


Project scope

Griffiths Drilling were invited by Opus International Consultants Ltd to join the team carrying out the preliminary geotechnical investigations. Two track mounted rigs were deployed to carry out the programme of fully cored holes.


Complicating factors and solutions

  • Limited access and steep terrain.
  • Helicopter access.
  • The third rig which is a helicopter portable unit, will be used to reach bore locations high up on the hillside that are only accessible by air.


MWH & NZTA (2013 – 2014)

Griffiths Drilling completed further geotechnical holes along the Transmission Gully route. There were approximately up 50 bore holes and the samples ranged from 15 to 70 metres.


Leighton Contractors & Coffey Geotechnical (2014 – 2015)

Griffiths Drilling successfully finished further detailed geotech investigations that were requested by the clients.


    Transmission Gully