Window Sampling Boreholes
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Window sampling is a technique whereby small diameter cylindrical steel tubes (with cut out windows) are driven into the soil with a mechanical (petrol, electric or hydraulic) hammer and extracted manually or hydraulically. The sample tubes will show a virtually undisturbed horizon for logging and (sub) sampling.
Window sampling can be used for a range of investigations, including for contaminated land, geotechnical investigations and for the installation of ground gas and ground water monitoring wells
Such rigs are good for investigating areas where access is limited. In addition to the standard window sampling machines, modular and hand-held equipment is available for difficult access such as embankments or basements. Electric rigs are also available for use in areas that may be sensitive to fuel exhaust and/or do not have suitable access for ventilating exhaust fumes.
The equipment is track mounted and is capable of carrying out in situ testing, including SPT/CPTs and dynamic probe testing. Dynamic Probe testing is a continuous soil test procedure which enables the relative density or strength of the ground to be inferred.
Cable Percussive Boreholes
Cable Percussive Boreholes can achieve deeper borehole depths than Window Sampling techniques - over 20m (possibly up to 50m depending on conditions) using a clay cutter through cohesive soils, a casing and shell through granular soils and a chisel to break up rock and other hard layers.
Gas Monitoring & Assessment
Kiwa can provide a standalone Ground Gas Monitoring service, or as part of a more detailed Phase 2 Intrusive investigation where assessment is made to BS8485 (Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings).
Rotary Boreholes
Rotary Open Hole techniques are employed to investigate the presence of shallow (<30m) coal using a water flush system to prevent the ignition of potentially explosive mine gases for deep observations of coal bearing strata.
Site Investigation
Kiwa CMT | We provide a range of ground investigation services
Trial Pitting
A trial pit (a.k.a. test pit) is a ground investigation technique that is used as a means of investigating, in large scale, the condition of the ground and the type of strata present at shallow depth, typically before beginning construction works. They are useful for obtaining large volume bulk samples of the ground.
Waste and Contamination
Kiwa CMT | Construction materials, geotechnical, structures and waste testing.
