Calgary Herald by Dan Healing.  A countdown is expected to begin within days on a process that could result in Chinese PetroChina taking 100 per cent ownership of a joint venture oilsands project in northern Alberta.  Athabasca Oil Sands Corp. reported Tuesday that it has received Alberta order in council approval on the MacKay River project it is proposing to build with its 60 per cent partner, PetroChina, and is awaiting final endorsement from Alberta Environment.