What does BGS stand for?

Below Ground Surface (depth below the ground surface)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

To accomplish this, thirty-nine (39), six (6) inch diameter relief wells were installed just outside the building's perimeter, extending down to 80 feet below ground surface.

Toyota Center, TerraFirma Earth Technologies Enter Two Year ...