A geologic preliminary investigation is a survey of the subsoil conducted by an engineering geologist in conjunction with a civil engineer. Typically, the footprint of the structure is established on the proposed building site and trenches up to fourteen feet deep are dug both outside, and more importantly, inside, the proposed footprint using the bucket-end of a backhoe.
A geological preliminary investigation is a survey of the subsoil conducted by an engineering geologist in collaboration with a civil engineer. The boundaries of the structure's footprint are usually established on the proposed building site, and trenches up to fourteen feet deep are dug both externally and internally using a backhoe.