Exxon, Conoco say Yellowstone oil sheen not theirs
"At approximately 3:30 p.m. on Friday, October 7, an oil sheen was observed on the Yellowstone River upstream of the refinery," Exxon spokeswoman Rachael Moore said.
Moore said an oil-spill response team for the 60,000-barrels-per-day refinery had laid a containment boom at the point of origin.
A spokesman for the Montana Department of Environmental Quality said ConocoPhillips' 58,000-bpd refinery in Billings is located north of Exxon's on the river and that they shared some pipelines and infrastructure.
A spokesman for ConocoPhillips said it did not believe the sheen was related to them.
"We are aware of this report and conducted our own investigation; we found no reason to believe it is related to our operations," said Rich Johnson, the ConocoPhillips spokesman.
Exxon said Billings refinery operations are normal.
(Reporting by Janet McGurty; Editing by Dale Hudson)