I'm replacing a 200 amp residential service. Meter base feeding a 200 amp main-breaker panel that is inside directly behind the meter base. The #4 bare copper GEC from the water pipe will only reach a ground bar in top of the panel which is the service disconnct. I'll be driving a supplemental ground rod. Is it OK to run the #6 bare copper GEC from the ground rod to the grounded conductor in the meter base or must it terminate on the same ground bar as the #4 bare copper GEC.