New reports show that nearly twice as much crude oil leaked from the Keystone Pipeline in South Dakota last November than originally estimated. TransCanada spokesperson Robynn Tysver said that roughly 9,700 barrels of oil leaked instead of the estimated 5,000 barrels. This new information means the leak is among the biggest onshore spills in the United States since 2010.

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There are 42 gallons in one barrel of oil, so instead of 210,000 gallons as was originally estimated, around 407,700 gallons leaked in what TransCanada refers to as the Amherst incident. This means the spill was the “seventh largest onshore oil or petroleum product spills” reported to the United States Department of Transportation since 2010, according to Aberdeen American News.

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TransCanada started utilizing the pipeline again 12 days following the leak. Tysver told American News, “The remediation work on the property has been completed. We have replaced the last of the topsoil and have seeded the impacted area.” The Amherst incident cost the company around $9.57 million, according to the news publication, citing an updated pipeline safety administration report.

TransCanada said on their website they sampled groundwater at 12 monitoring wells and there “was no impact to groundwater.” The Keystone Pipeline connects oil fields in Alberta, Canada to refineries in the United States; Reuters described it as a 590,000 barrel-per-day pipeline.

Aberdeen American News said according to a preliminary report, the pipe may have been damaged in 2008, during construction. Reuters said they had reviewed documents revealing Keystone has leaked far more oil, and more frequently, “than the company indicated to regulators in risk assessments” before operations started in 2010.

The Pipeline and Hazardous Materials Safety Administration, part of the Department of Transportation, could release the final report on the leak in the upcoming few weeks.

Via Aberdeen News and Reuters

Images via TransCanada