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Atrial pit (ortest pit) is an excavation of ground in order to study or sample the composition andstructure of the subsurface, usually dug during asite investigation, asoil survey or ageological survey.[1] Trial pits are dug before the construction. They are dug to determine the geology and the water table of that site.
Trial pits are usually between 1 and 4 metres deep, and are dug either by hand or using a mechanical digger. Building and construction regulations clearly state that any trial pits that concede deeper than 1.2 metres should be secured against structural collapse, if they are to be entered by people.
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