>The images of South Dakota grassland blemished by 210,000 gallons of leaked Canadian crude oil could not have come at a worse time for the Keystone Pipeline’s operator, TransCanada, which on Monday will ask regulators in Nebraska to approve a different pipeline despite fierce opposition.
This week’s leak was grimly familiar for Bob Banderet, a rancher on the Keystone route in North Dakota, about 20 miles north of the spill. In 2011, Mr. Banderet said he had spotted “a geyser of o