is there a print for the house? On the blueprint, it should show how far the foundation goes out. As for drains, they can always appear anywhere. If this is a new job, as the GC in charge of the job. If it is an old home, look for any pipes leaving the house near where you want to install ground rods, look for cable TV wires, Telco wires, gas lines, etc. and cross your fingers. [Linked Image]