ENERGY

Arco Settles Environmental Suit: Arco Alaska Inc. said it has settled a lawsuit filed by an environmental group by agreeing to pay $1 million and to develop more ecologically sensitive methods for oil-field waste disposal on Alaska’s North Slope. The agreement between the Atlantic Richfield Corp. unit and the Natural Resources Defense Council was approved by federal Judge Russell Holland, Arco said. The NRDC, upset about 200 old, unlined waste pits at Prudhoe Bay and Kuparuk River, North America’s two biggest oil fields, had sued Arco for alleged violations of the Clean Water Act.