Prairie Business

State officials are investigating about 100 filter socks that were improperly disposed of in north Williston, the Department of Mineral Resources said Thursday.

Clean-up is expected to begin today to remove the new and used filter socks discovered by a citizen who reported the oilfield waste to authorities on Monday, said department spokeswoman Alison Ritter.

Used filter socks, a waste product of oil and gas production, contain low levels of naturally occurring radioactive waste and need to be transported out of state for disposal under current rules.

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