The bow is being built via excavation. THey pound in the pilings then excavate and but up wood to hold back the walls. MEanwhile they anchor the wood to exposed pilings and put in giant anchors to the bedrock behind the wall. The walls will eventually be concrete when they add the floors for the underground parking and foundation. I don;t know where the material is going.
The Germain (the hotel) is being buit via a slurry wall. A new stlye of construction for calgary. I think they are doing a simialr function to hydrovacing but filling the hole with concrete. Then they will excvate and teh entire pit will already be shored up with concrete.
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http://forum.skyscraperpage.com/foru...hp?forumid=127
Hope that helps.