'66,
I wouldn't have a problem with accepting 2 made electrodes of any type when there are adverse soil conditions. Best to check with your local inspector. Hope you've found one better than the last guy you mentioned.
The ground ring would only be one electrode. If you're going to dig a tremch, just dig one 30" deep and long enough to bury two rods horizontally with 6' spacing.
Two plates separated by 6 feet would meet 250-56.
As far as AP requiring the 2 electrodes, you might as well install 2 anyway. I personally don't know anyone with the proper test equipment, other than one mine electrical inspector in Fairmont. Generally speaking, in most cases you could drive the second electrode faster than you could do the test, which will likely exceed 25 ohms almost anywhere in WV.
I'd be glad to do an inspection for you, but I don't think you could handle the windshield time & mileage charge.
AP has been sued enough times that they keep getting more restrictive, someday their specs will reach the point that no one will be able to afford service.
Tom
