Pipelines can be hazardous. An average of 97,376 barrels (4.1 million gallons) of petroleum and other “hazardous liquids” have been spilled each year in pipeline incidents over the last decade, according to the Department of Transportation’s Pipeline & Hazardous Materials Safety Administration. These incidents have claimed an average of two lives per year, and resulted in more than $263 million in annual reported property damage as well.
Those figures include the most expensive onshore oil pipeline spill in U.S. history, caused when 30-inch pipe operated by Enbridge ruptured on July 26, 2010, near Marshall, Mich. That dumped more than 1 million gallons of Canadian diluted bitumen — the same material that would be carried in the proposed 36-inch Keystone pipeline — into the Kalamazoo River. Enbridge is still struggling to complete the cleanup, having failed to meet a Dec. 31 Environmental Protection Agency deadline for dredging remaining oil residue that settled on the bottom of the river. Although Enbridge initially put the spill at about 840,000 gallons, the EPA said last year that 1.15 million gallons had been recovered and 350,000 cubic yards of contaminated river sediment remained to be recovered. Enbridge said in August 2013 that it had spent more than $1 billion on the cleanup and remediation to date, and the figure continues to rise.
A spill from the Keystone could potentially have similar effects. The Nebraska Department of Environmental Quality, in its final evaluation report on the project, found that the properties of the diluted forms of bitumen that would flow through the state in the Keystone pipeline “are similar in many respects to other heavy sour crude oils.” For what it’s worth, TransCanada says it plans to make the Keystone “the safest pipeline ever constructed in the U.S.,” adding more remote shut-off valves and inspections and burying the pipe more deeply than with other pipelines.