WATFORD CITY, N.D. (AP) — A vibration in an oil tank apparently caused a bolt to come off and spill more than 20,000 gallons of oil in western North Dakota, the North Dakota Oil and Gas Division said.
The spill happened Saturday at a well about 6 miles (9.7 kilometers) west of Watford City. Newfield Production Co. reported Sunday that 20,160 gallons of oil was released after an equipment failure at the location
All of the spilled oil has been recovered. The spill was contained by dikes, state Oil and Gas Division spokeswoman Katie Haarsager said.
A state inspector has been to the site and will continue to monitor the cleanup and remediation.