Window Sampling Description of service Using Competitor and Terrier rigs we are able to provide a comprehensive window sampling and dynamic probing service. Using these soil sampling rigs continuous undisturbed samples are taken to 10.00 m whilst we are able to carry out SPTs or probe for obstructions to 20.00 m. CJA Approach Our drillers are the key to providing a full day of superior sampling, coverage and depth. SPTs are taken to BS1377 and undisturbed sampling is undertaken to BS5930. The rigs are capable of coring through concrete, casing holes and working within buildings. | 
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