Techniques used for disturbed/undistursbed sampling include:


Hand augering can achieve depths of up to 8.0m in most clay and some times granular soils. In-situ Shear Vane or Mackintosh Probe tests are carried out depending on soil types encountered. This method suits domestic properties or very limited access sites and is generally used for strip foundations, slab/raft designs or where a property shows signs of subsidence.


The Restricted Access CFA mechanical drill rig can achieve depths of up to 20m and incorporates the above in-situ testing. This method suits investigations on domestic properties or very limited access sites for slab/raft, strip foundation, pile design or subsidence investigations. The rig is carried on a trailer and is towed by a 4-wheel drive vehicle or panel van.


Tracked GEO 205 mechanical drill rig can achieve depths of up to 30m. Standard Penetration Tests otherwise known as SPTs are carried out at requested intervals to achieve data for calculating allowable bearing pressures. This method is particularly suitable for new build investigations on open and limited access sites and is especially suitable for pile design, retaining wall design etc. Undisturbed sampling can also be achieved with this rig on request. The machine is carried on a trailer and is towed by a Landrover which is fitted with a 2 ton winch.


Mounted 305 Lorry Mounted Rig can achieve drill depths of up to 70m. Undisturbed and disturbed sampling can be carried out with various diameters. SPT's stated above and Cone penetration tests otherwise known as CPT's are carried out at requested intervals to achieve the data needed to calculate allowable bearing pressures. This method of drilling is ideal for open, non-restricted access sites and is a safe alternative to shell an auger. The drill is mounted on a 4-wheel drive Bremach truck. The vehicle weighs 6 tonne and has a 3520kg payload capacity and drill also consists of a rotary head slide carriage provided with a hydraulic side shift capacity.


The Shell and Auger and Cut down version drilling method can achieve depths between 20m and 40m, and incorporates SPTs with Undisturbed sampling (U100’s). The machine and trailer is as one and is towed by a four-wheel drive. This drilling method compliments new build investigations on internal, external, open and limited access sites especially for pile design and retaining wall design.


Window sampling this method can achieve depths up to 12m and also incorporates SPTs and undisturbed sampling. Dynamic probing can also be arranged on request. The machine is carried in the back of a van or on a trailer towed by a 4-wheel drive or panel van.This method suits limited access or open sites, but borehole depths may be reduced if the ground is very dense or an obstruction is encountered.


Trial Pits can be carried out using hand tools, mini or large mechanical excavator depending on access or ground conditions. Excavations exceeding 1.5metre in depth are shored where necessary.


In-situ testing and sampling Shear Vane or Mackintosh Probe tests along with disturbed sampling are normally utilised when carrying out trial pitting.


The hand dug method is used to expose existing foundations for subsidence or new build investigations on domestic or restricted/ internal access sites, also for contamination or CBR sampling.


The machine dug trial pits are suitable for new build design, contamination, exposure of deeper existing foundations or locating services such as deep drainage or sewers etc.

Hydraulic/Electric breakers or Core drilling are used to penetrate concrete etc.


Hollow Stem Augers: This method is used when installing standpipes and piezometers in collapsible material. This enables gas and water levels to be measured over a period of time. This method of installation is carried out with our Geo 205 and lorry mounted MC 305 drilling rigs.


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