Is your concrete slab really going to vary from one foot to five feet THICK?
I must have read your post wrong. 8 x 13 x (1 to 5 feet) is around 10 cubic
yards of concrete -- that's a lot of concrete.

He said it was on a hillside....


Richard Navarrete

Astrophotography Web Page - http://members.aol.com/richardn22