Hey ,welcome to the site !!
I'm predominately in the roadbuilding/earthmoving side of things now ,but my father was a underground ( water/sewer ) Foreman for over thirty five years and I got to know some through that .I also spent a lot of my youth going with him to work ( weekends/summers ) until I turned fourteen and started earning a paycheck for doing the work he had me doing anyway . I did everything from backfilling to being a copperman and putting in house services ( water/sewer/storm lines ) . Don't know too much about the business of it today , but am willing to share what I do know or remember . Good luck in your new endeavor ,
Rob