NTSB: Neglect, inaction caused huge Mich. spill

NTSB approves report blaming huge 2010 Mich. oil spill on Canadian company's neglect, inaction

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DETROIT (AP) -- A Canadian company's failure to deal adequately with cracks in an oil pipeline and its slow response to a 2010 rupture in southwestern Michigan likely caused the most expensive onshore oil spill in U.S. history, the National Transportation Safety Board said Tuesday.

Enbridge Inc. knew in 2005 that its pipeline near Marshall, a city 95 miles west of Detroit, was cracked and corroded, but it didn't perform excavations that ultimately might have prevented the rupture, NTSB investigators told the five-member board at a meeting in Washington.

Investigators also faulted Enbridge control center personnel for twice pumping more oil into the line after the spill began and failing to discover what had happened for more than 17 hours, when an employee of a natural gas company notified them.

The board voted to approve the findings after testimony concluded.

The spill dumped about 843,000 gallons of heavy crude into the Kalamazoo River and a tributary creek, fouling more than 35 miles of waterways and wetlands.

Enbridge's cleanup costs have exceeded $800 million, which NTSB Chairman Deborah Hersman said was more than five times greater than the next-costliest onshore spill.

"This accident was the result of multiple mistakes and missteps by Enbridge," Hersman said. "But there is also regulatory culpability. Delegating too much authority to the regulated to assess their own system risks and correct them is tantamount to the fox guarding the henhouse. Regulators need regulations and practices with teeth — and the resources to enable them to take corrective action before a spill, not just after."

A message seeking comment was left with Enbridge.

The U.S. Department of Transportation's Pipeline and Hazardous Materials Safety Administration last week proposed a record $3.7 million civil penalty against Enbridge.

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