Thanks 21boat. I should have asked BEFORE I dug the holes - now I'm going to have monster footings! I guess if I ever want to add 3 more floors, I'll be safe!
FYI, I tried to rate your answer, but AMHD won't let me because I guess I rate you too often (because you answer so often!). Anyway, I greatly appreciate your response. Hopefully I can get them all poured today. Thanks again.