This is for a pole barn/garage site. I'm planning on a 6" thick concrete floor. Nothing heavier than a full size truck or a Suburban will go in it.
There is no sod, I have it built up with fill dirt (clay), which was hauled in 2 years ago. So, it's pretty much settled now. I thought it was pretty level, but checked it with a line level and it's about 10" low on one side. I was going to put just 3" or so of gravel over the whole thing, but now I either need to get some more fill dirt for the low end, or just make up the difference with the gravel. That means I would have 13" of gravel on the low side and just 3" of gravel on the other side. I'll put more fill dirt/top soil around it to contain it, and plant either grass or crown vetch.
I talked to a place that sells gravel and stuff and they recommend a #53, which has lime in it so it will pack down. Is that the same as "crusher run"