A trial pit (or test pit) is an excavation of ground in order to study or sample the composition and structure of the subsurface, usually dug during a site investigation, a soil survey or a geological survey.
Trial pits are dug before construction to determine the geology and ground water conditions existing on site.
Trial pits are usually between 1 and 4 metres deep, and are dug either by hand or using a mechanical digger.
.
