extracción de testigo

Question

What is the correct translation of this phrase "extracción de testigo" in English if the context is Tunnel Construction.

The entire sentence if someone requires is "bien a destroza o bien con "extracción de testigo"

Thanks,

Rickson

Answer 1

I'm not sure if this will be of much help as I'm just guessing that it means a 'core sample' but here's a picture of one being taken:

and

This is what they look like:

Also this from RAE - Especie de hito de tierra que se deja a trechos en las excavaciones, para poder cubicar después con exactitud el volumen de tierra extraída.

If I have no idea what something is I'll try a couple of tricks - no 1. Rae is always a good place to check, it's in Spanish but you should atleast get some clues even if your Spanish isn't quite up to understanding it all. No 2 i google the phrase and go to images. I hope that this will prove useful for you too All the best!