I am having the same problem and wondered if you fixed your problem?

You said "The bonding wire lies in sand/dirt/compacted gravel as it travels around the pool and into the pool house where it connects to the pump lug; the bonding wire is about 180' in length and connects to the aluminum coping every 18"-24"."

Does the bonding wire just connect to the pump lug or does it also connect to your electrical ground?