What I learned about gravel:
1 ton of 3/8" pea gravel will cover 90 square feet. Since we're trying to cover an area roughly 60x60, or 3,600 square feet, we need 40 tons. Gravel comes by the truck load, at 2-16 tons per truck load. We opted for a 16 ton load, and will get more after we get the first load moved. And by moved, I mean wheel barrelled into the runs.
I keep hearing Tennessee Ernie Ford's velvet bass voice in my ear - "You load 16 tons-whatta you get? Another day older and deeper in debt..." Hmmm.