According to the report from last year, as long as nothing is done to disturb the creosote, it's basically safe in its current state. The containment measures that were undertaken in the 1990s have done what they were supposed to do.
Obviously, once they decide to build something on that land, it will need to be cleaned up somehow.
That's the problem. It costs nothing to do nothing and it isn't getting any worse, so there's no urgency to do something.
Here's the report:
http://agendaminutes.calgary.ca/sire...&fileid=427928