LINCOLN, Neb. (AP) — A company plans to help clean up groundwater pollution at its soybean extraction plant in Lincoln by use fracking technology.

The state’s environmental quality agency gave preliminary approval last month to Archer Daniels Midland Co. for the work.

Crews will inject emulsified iron and vegetable solutions under high pressure into the ground to help remove lingering contaminants, including carbon tetrachloride. The hazardous chemicals were once commonly used as a grain fumigant to kill insects during the 1950s and 1960s.

Company officials believe the contamination was there before it bought the grain elevator complex in 1966.

Supervisor Tom Buell, of the state agency’s voluntary cleanup program and Superfund unit, says there’s no public health risk associated with the groundwater contamination.