A pair of oil spills were reported over the weekend in North Dakota, the number-two crude-producing US state.
In the larger of the two, the North Dakota Department of Health said about 690 barrels of crude spilled from an underground pipeline at an oil gathering site about 14 miles north-east of New Town in Mountrail County, North Dakota.
The spill was at the site of an EOG Resources-operated well. A Health Department spokesman told the Associated Press that a perimeter dyke at the well site prevented much of the spilt crude from escaping.
Wyoming-based Bridger Pipeline owns the ruptured line. No cause had been determined by Friday, the day the spill was discovered.
The Health Department said on Saturday that about 640 barrels of oil had been recovered.
In a separate incident, another pipeline was ruptured during trenching operations, leading to a spill of about 300 barrels of oil.
Damage to the Belle Fourche pipeline in McKenzie County caused the spill, though most of the oil was confined to the trench and no water sources were affected, state officials said.
North Dakota produces close to 1 million barrels per day of oil, ranking only behind Texas on the list of producing states.