The drilling specification called for a combination of sonic and air rotary drilling at a diameter of 250mm with the installation of 168mm 316 stainless steel screens.
This program involved drilling PQ3 bores down to a maximum of 150 metres and required quality core from the alluvial sediments.
Star Drilling has worked multiple rigs with GHD for two years drilling geotechnical bores for the three possible routes of the Northeast Link.