[GWN7]

Instead of leaving 18' of steel line under a concrete slab why not drill under the slab to replace the 1/2 blocked line that you are using now with a clean clear line? Lots of videos on YouTube on how to do this. At some point that galvanised pipe will block completely or rust thru. Why only do 1/2 the job and then have to redo it again in a couple years?

When I built a house in Ontario the regulations called for two ground rods 6' apart. If I was building on solid rock I could attach the ground wire to both ends of the rods and lay in a shallow trench with 6" of covering overtop. Basically 22' of ground wire buried with the rods attached. I built on sand and was able to drive both rods into the ground with a sledge hammer. Here all is required is the ground wire is attached to the supply side of the water meter line.