Packaging Corporation of America has notified its Wallula mill employees the plant will be idled and won’t resume operations until later this year. Packaging Corporation, based in Lake Forest, Illinois, confirmed the layoffs in a statement. It attributed the decision to idle the plant to “economic conditions.” “We expect to resume operations at the mill later this year,” the statement said. Corrugated products facilities in Richland and Wallula are not affected and will remain open. It appears the decision will affect about 300 of the 450 Packaging Corporation employees at Wallula, many of whom commute from the Tri-Cities. According to the Washington Department of Ecology, Packaging Corporation employs about 300 people at the pulp and paper mill and 155 at the unaffected container plant.