I'm doing a job for a small operater in a rural airport. Its an aboveground tank with a retail type gas pump piped to it. The owner has been talking to an engineer who has helped set this system up. I have no problem with the regular stuff, pump, tank, tank monitering but the guy wants the pump, hose reel and static strap bonded together and then to a ground rod driven beside the concrete pad. He has no concern about the size of the EGC I have pulled to the pump(#12). What code am I violating if I drive the rod without the proper size conductor going back to the service??