As stated above, some bitumen naturally flows into northern lakes, rivers and streams. I remember as a kid swimming in the Clearwater or Hanging stone river, I would actually get oil stains in my cloths. Oil can be seen oozing from the banks of the Athabasca, Clearwater, Horse, House, Hanging Stone, and pretty much any other stream in the Ft Mac area. I'm no biologist, and have no idea the ecological effects of it, but I do know it naturally occurs. I hope they find the leak soon in any case.
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