Although the suggested method of using a water jet to run coax under a drive
way would also be my choice, I would like to suggest a caution.
Before starting, find out the substructure composition and depth before
starting your water jet. Most driveways have some form of substrate consisting
crushed stone 3 to 4 inches or more thick. On top of that may be cement,
black top or a sand base and pavers. It is very easy to undermine the paver
blacktop driveways if you errode the sub base.
Dig down along side of the drive, determine the make up of the structure and
its depth. I would go at least 6 inches below the substrate to start your
The other problem is making sure you have excavated enough of a trench to
allow your jet tube to be parallel to the ground so that you don't angle your
tunnel down and end up very deep on the opposite side.
Here in Florida this is an easy task as we are dealing for the most part with
Sand. Clay can be a little tougher.
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