Lessons from the 2026 Athabasca Oil Corporation Leismer turnaround Athabasca Oil Corporation reported that its three-week Leismer facility turnaround, completed in May 2026, finished on budget and on schedule. On that same job, Heartland Energy Solutions Inc. built 46,906 cubic feet of scaffold that was not in the original estimate, 17 percent more than the scope we priced. Both statements are true. The relationship between them is the subject of this article. Scope growth is