AUGUSTA (AP) — Maine’s highest court is scheduled to hear arguments in a legal dispute over the environmental cleanup of the former HoltraChem Manufacturing Co. plant in Orrington.

The Portland Press Herald (http://bit.ly/NxTqzi ) reports that the Supreme Judicial Court will hear oral arguments Tuesday on an appeal by Mallinckrodt LLC, a St. Louis-based pharmaceutical company that inherited responsibility for the site after HoltraChem went bankrupt. Mallinckrodt is seeking to overturn an order that it must complete an environmental cleanup that could cost $250 million.

The chemical plant used mercury in its manufacturing processes and dumped waste directly into the Penobscot River. The plant later deposited waste in five landfills on its 235-acre campus.

Mallinckrodt contends in its appeal that the Maine Board of Environmental Protection overstepped its legal authority in ordering the cleanup.