@JOECOOL-
While I am sure I will get flamed for this...lol....I know that it is technically not under the building as defined in T300.5, and we also know that nothing would require you to actually bury it in the first place other than to avoid physical damage. To be honest with you I would permit it (as the AHJ) as the concrete is the actual floor and your company has chosen to apply a 3" floor covering which is obviously removable...to which now you are going to be encasing the conduit in with the finished concrete floor, I would have no issues with the installation.
However- be prepared for other opinions on that.