Pierre, SD – Associated Press reports that TransCanada Corp.’s Keystone pipeline has leaked 210,000 gallons of oil onto agricultural land in northeastern South Dakota, but state officials don’t believe the leak polluted any surface water bodies or drinking water systems.
State officials and pipeline operator TransCanada Corp. disclosed the leak Thursday, and the company shut down the pipeline.
TransCanada said it activated emergency response procedures after detecting a drop in pressure resulting from the leak south of a pump station in Marshall County. The cause was being investigated.
Discovery of the leak comes just days before Nebraska regulators are scheduled to announce their decision Monday whether to approve the proposed Keystone XL oil pipeline, an expansion that would boost the amount of oil TransCanada is now shipping through the existing line, which is known simply as Keystone. The expansion has faced fierce opposition from environmental groups, American Indian tribes, and some landowners.
Brian Walsh, an environmental scientist manager at the South Dakota Department of Environment and Natural Resources, said the state has sent a staff member to the site of the leak in a rural area near the border with North Dakota about 250 miles (402 kilometers) west of Minneapolis.
TransCanada said in its statement that it expected the pipeline to remain shut down as the company responds to the leak. It did not offer a time estimate, and a spokesman didn’t immediately return a telephone message from The Associated Press.
The federal Pipeline and Hazardous Materials Safety Administration didn’t immediately return an email requesting additional information from The AP. Since 2010, companies have reported 17 spills bigger than the leak announced Thursday, topping 210,000 gallons (5,000 barrels) of crude oil or refined petroleum products, according to U.S. Department of Transportation records.
The existing Keystone pipeline transports crude from Canada to refineries in Illinois and Oklahoma, passing through the eastern Dakotas, Nebraska, Kansas, and Missouri. It can handle nearly 600,000 barrels daily, or about 23 million gallons. TransCanada says on its website that the company has safely transported more than 1.5 billion barrels of oil, or about 63 billion gallons, through the system since operations began in 2010.
A leak and spill in southeastern South Dakota in April 2016 prompted a weeklong shutdown of the pipeline. TransCanada estimated that just under 17,000 gallons (405 barrels) of oil spilled onto private land during that leak. Federal regulators said an “anomaly” on a weld on the pipeline was to blame. No waterways or aquifers were affected.