My dilemma is how to proceed. I've read all the horror stories about burning. It would not be practical to attempt to bury that much material. Taking to landfill/composter would take a number of semi-trailers and probably cost as much as the land did.
There you have it. Would appreciate any guidance how to proceed. How can I dispose, reduce, clean up or otherwise get rid of these poisonous, monster brush piles?
Depends on how big of a hurry you are in ...
I have a number of brush piles around the place here. The biggest one is probably 6' high, 8' wide, and 50' long ... that one gets a lot of large brush, saplings, small trees, prunings, etc. - this year I dumped a bunch of old fire wood (ash and maple) that we hadn't used into it - it was cut long ago and was going south (rotting) Probably another year or two on that pile until it's ready.
Another one is last year's compost pile, which is just about ready - another month two and it could be used, but I'll probably let it set until next spring. This pile is about 4' high, 5' wide, and 30' long. And there's another 3 or 4 smaller ones up in the woods.
But my most favorite one is year before last's compost pile, which was made mostly with leaves, prunings, and grass clippings - it's a beautiful black rich soil probably very similar to high quality potting soil you'd pay good money for.
If you're not in a big hurry it sure sounds to me like you have the makings of a great compost pile.