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Since you went so deep, you must have a deep frost. I suggest gravel at the bottom and as back fill. This prevents frost heave as you especially need with such deep footings. Also, I would pour the footing pad (recommended to prevent heave) separate with steel to connect to sono pour later. Then wrap plastic around sono before install to help prevent heave. The water freezes around the pier forms ice lenses (Google that) and displaces or jacks the pier. As it freezes around, it also freezes under, even beneath the frost line. Even the manufacturer of tubes recommend gravel.

http://rockproducts.com/mag/rock_aggregates_prevent_frost/

http://books.google.com/books?id=1g...=X&oi=book_result&ct=result&resnum=3#PPA31,M1

Be safe, G
 
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