I was wrong! Checked again and the other wire from the Ufer goes to the water. Panel in the house has no GEC, and the Ufer/water GEC only goes to the main, located at the detached garage. And, the garage does not have a rod, just a wire dangling out of the panel where it used to be...
Goes to show, when you think something is messed up, look again, it might be worse than you thought!
Is the only thing that is missing here the GEC connections to the feeder supplied panel at the house? By NEC alone is the Concrete Encased Electrode and the water line located at the house
enough to ground the service neutral at the garage? How long is the GEC between the two buildings? Would anyone, besides me, see some virtue in running the GEC as bare number two in the trench between the house and garage?
Call me a fanatic but I would want to drive a stacked rod at the garage and add sections until I got under 25 ohms if the GEC did not show an impedance of 25 ohms or less when run to the electrodes at the house only. What's more I would make the GEC connection from those stacked rods at the service head if the service is supplied by an overhead drop. The idea of a lightning induced surge trying to find earth via the GEC run to the house would make me nervous.
"This alternating current stuff is just a fad. It is much too dangerous for general use." Thomas Alva Edison
[This message has been edited by tdhorne (edited 01-03-2006).]