The Union Pacific Railroad says 6,500 gallons of oil spilled when a train derailed in northern Colorado on Friday.
A railroad spokeswoman said cleanup operations were still underway Saturday. State officials say the spill was contained to a ditch and didn't reach the nearby South Platte River.
The railroad says the contaminated soil will be removed and replaced with clean soil.
Six of the 100 cars in a crude oil train derailed west of LaSalle, about 45 miles north of Denver. One car leaked.
Three cars were empty and have been moved. Two-thirds of the oil in another car had been removed by Saturday and another was still full.