Reno:
As to the '2 rods'...basically most ECs I know 'just do it', as if it's looked at in a dollars and sense standpoint. Taking into account the $$$ of testing equipment, driving the reference rods & performing the test, economical sense is to drive the second rod & the job is done.
For some time, quite a few guys still installed rods with Ufers, and I still find the occasional 'water ground' with a jumper on the 2" plastic main, and PEX piped resi.
