Great press release this morning! It answered my question:

Q: "... where does the product to be refined come from?"

A: "Furthermore, Connacher currently purchases Bow River heavy crude oil produced in southern Canada for its refinery at Great Falls, Montana. Our refinery operates effectively and safely within the framework of very strict environmental standards as established by US Federal and Montana State agencies."

Also clarified the increase isn't a 35,000 bbl/d increase, rather from 9,500 to 35,000 bbl/d total.