Acta Scientiarum Polonorum

Eurocodes assume that proper actions are taken at different stages of an investment process, beginning from
preliminary ground investigation, design, execution, and up to maintenance. The main goal is to limit possible
risks, including the impact of subsoil variability. First step is to conduct proper geotechnical investigation.
The aim of the paper is to revise the problem of subsoil variability, as it is often forgotten in practice, leading
to various problems at the construction sites, which later can result in failures, unsubstantiated claims, conflicts,
and overdesign of structures. This issue is especially important in the case of underground structures.
The role of the scope of an investigation is discussed as one of the contributing factors to mitigate the risk
associated with such structures.