My mountain isn't quite that big, it's only as tall as the truck could dump, maybe 6 feet or so and probably 20 feet around. I haven't noticed it steaming yet. There's lots more in the neighbors field that I have permission to mine. It is more of a mountain range with similar sized piles covering an area probably 100' by 500' and growing, it's huge! I could have had it all, had I had a place for it. By time I use mine all up the neighbors will be on the way to pure compost.
Nothing ruins a neighborhood like paved roads and water lines.