UK CONTRACTOR Foundation and Exploration Services (FES) recently completed a site investigation at Gemma's Gulch on East Island in the Falklands.
The investigation, for the Ministry of Defence, was supervised by UK consultant Gifford & Partners.
FES investigated ground and groundwater conditions in a disused quarry to determine its suitability for landfill.
Ten 25m deep rotary boreholes were put down and 73mm standpipes installed to carry out insitu variable head permeability testing using a Grundfos MPI pump.
Three existing boreholes next to the quarry were refurbished and standpipes fitted.
Rock encountered was mainly strong, highly fractured crystalline sandstone and mudstone.
Although faced with persistent, subvertical fractures, FES obtained intact, representative cores of 104mm and 90mm diameter using a Puntel MX600 truck-mounted rotary rig with air mist flushing.
Logging and initial strength tests were carried out on site and further analyses were undertaken when the cores were returned to England.
Equipment and materials were transported by sea on a scheduled MOD service while staff flew from RAF Brize Norton via the Ascension Islands. The fieldwork was completed in four weeks.