I finally got around to reading Mike Holt's article on ground electrodes in EC&M magazine.
I am left with the same question I always have with these articles. He says the swimming pool steel can not be used as a ground electrode and he also says only one concrete encased electrode can be used.
My question is how do you avoid those pesky electrons from going there?
For now let's just talk about my pool.
The equipotential grounding grid picks up the pool shell, the deck and the screen cage, that is also connected to poured concrete piers with rebar in them. All of that is bonded. That bonding also connects to pumps, heaters, underwater lights and a spa air pump. Those are all connected to the grounding bus via EGCs that are at least 12ga copper. Didn't I just bond the pool shell and deck to the grounding electrode, creating a much larger electrode system? In my case that also picks up Ufers in the structures around the pool deck since all of that steel is bonded to the deck steel, connected to the pool shell steel.
This all might be a nice theory but that pool structure and deck is still the biggest electrode in the system unless you violate article 680