Rotary Boreholes
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The technique is not suitable for effective sampling but is a quick procedure for probing the presence of old mine workings.
Combinations of techniques can be used, such as windowless sampling, as well as the rotary open hole technique, if suitably less disturbed samples are required from the upper strata. This can facilitate a number of investigations and assessments being carried out with one site visit rather than two or more.
In a coal mining area, before works are carried out, there will be a need to obtain permission from The Coal Authority. It should be noted that this can sometimes take up to 28 days for permissions to be obtained but they do offer an expedited service in which we will receive the permission within 2 weeks at an increased cost of 100%.
Our service provides the client with obtaining the licence, carrying out the site works and then providing a factual report.
How are the reports presented?
Our reports are provided in PDF format via email.
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.
Coal Authority Assessments
Developing on land that has been previously mined or has had the potential to be previously mined can be problematic. As such the Coal Authority (CA) is a statutory consultee for the planning departments across the country.
Window Sampling Boreholes
Window sampling or windowless sampling is a technique used to bore through shallow soft soils to investigate the substrata in order to gain a profile of the ground conditions and to facilitate soil sampling for chemical and geotechnical analysis.
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.
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).
Site Investigation
Kiwa CMT | We provide a range of ground investigation services
