Well 43560 sqf. to an acre so 1 foot thick ( 2 lifts ) or 1613.33 cubic yards. So truck holds 12 to 20 yards of clay. So you can expect a large bill. Clay cost $6 to $12 yard and delivery $6 to $10 a mile. Cat and roller $190 to $225 an hour. Your local prices may be deferent.