Please note that this is a scanned copy of a paper originally published in 1995, so the text is not as clear as in documents created as pdf files. This Digest describes the field techniques most commonly used during site investigations for low-rise buildings and provides guidance on how to select the appropriate method for a specific location. As part of the process of investigating ground conditions at a site, for example in order to ensure the adequate performance of foundations, it will often be necessary to carry out this kind of work. It should be preceded by a desk study (Digest 318), and a walk-over survey (Digest 322). 12 pages.