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Yellowstone oil spill to cost Exxon $135M

Exxon Mobil said Friday it expects to incur costs of about $135 million from an oil pipeline break beneath Montana’s Yellowstone River that triggered a massive effort to limit damage to the scenic waterway.

The cost figure was released to The Associated Press and is more than triple an earlier estimate. It includes for the first time the expense of replacing the section of broken pipeline with a new one buried more deeply beneath the river.

The company’s 12-inch Silvertip crude oil pipeline broke July 1 during severe flooding.

In the 56 minutes it took Exxon Mobil to seal off the line, an estimated 1,000 barrels of oil, or 42,000 gallons, poured into the river near Laurel. That fouled dozens of miles of riverbank, numerous islands and swaths of low-lying cropland with crude.

More than 1,000 workers were involved in the cleanup effort at its peak.

Work to remove the damaged pipeline began Monday and is expected to take several weeks.

An Exxon Mobil spokeswoman declined to release a breakdown of the company’s costs, providing only a broad overview of expenses.

“This estimate includes costs for overall emergency response and cleanup efforts including personnel, equipment, landowner claims and projects associated with the restart of the pipeline such as the horizontal directional drill,” company spokeswoman Claire Hassett said.

“Horizontal directional drill” refers to the process the company used to bore a new route for the pipeline dozens of feet beneath the riverbed. That move was mandated by federal pipeline regulators.

The original pipeline was buried only a few feet beneath the riverbed. State and federal officials have speculated that summer flooding scoured the riverbed and left the pipe exposed to damaging debris and the sheer force of the rushing river.

An investigation into the cause remains pending.

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