A suggestion for other folks who will be burying a conduit: Take a bunch
of pictures before the trench is filled. It's good to include distances
to some fixed reference points -- you can write them with a marker on
big pieces of paper laid on the ground to get them in the picture. I
haven't yet used the pictures I took of mine, but I sure have made a lot
of use of the pictures I took of the uncovered walls of a home addition,
showing the locations of all the studs and wiring.

Roy Lewallen, W7EL