CALGARY, Alberta – Clint Big Eagle says the whiff of oil permeated the frigid Saskatchewan air for about a week and a half before he decided to pull over and investigate. “The kids are all, ‘It’s a terrible, ugly smell. What is that?’“ Big Eagle said in an interview. That turned out to be a 200,000-liter pool of crude coating a frozen pond, a few hundred meters off the road on Ocean Man First Nation territory. “That’s an incredible amount of oil not to keep accounted for,” he said. The pipeline spill, discovered on Jan….