BISMARCK, N.D. (AP) — The amount of chemically tainted soil and other drilling waste produced in western North Dakota's thriving oil patch has been growing so quickly that the special landfills where it's disposed are filling up and the state will soon need more of them, state health officials say.
Data obtained by The Associated Press show the amount of so-called oilfield special waste has increased nearly 5,100 percent over the past decade, to more than 512,000 tons last year.
The more than 1 billion pounds of oilfield waste produced this year is roughly weight of the sunflower harvest in North Dakota, which is the nation's top sunflower producer.
The growth of oilfield special waste "is just incredible," said Steve Tillotson, assistant director of the North Dakota Health Department's waste management division.
Trucks are hauling oilfield waste to facilities "24 hours a day, seven days a week," Tillotson said.
Oil companies increasingly are moving drilling waste off well sites, as more stringent regulations have been put in place, said Tillotson and Bruce Bogenrief, general manager of Sawyer Disposal Services, which runs an industrial waste landfill near Sawyer in north-central North Dakota.
"In the past, a lot of it was put on site," Bogenrief said. More "teeth in the regulations" has prompted companies to pay to haul the waste to approved facilities for environmental and liability reasons, he said.
"Tonnage-wise, it's going off the chart," Bogenrief said of the amount of oil waste being hauled to the special landfills.
Only five facilities in North Dakota are permitted to accept oilfield special waste, which includes chemically treated rock, soil and other solid material brought to the surface during oil well drilling. Tainted earth from oil spills also is shipped to the facilities that use massive clay- and plastic-lined pits to prohibit polluted material from leaking into water sources.
Existing oil waste disposal sites are nearing capacity and companies have been considering building more than a dozen similar facilities, said Scott Radig, the state Health Department's waste management director.