Union Pacific Resources, a subsidiary of Union Pacific Corp., has completed the sale of its Wilmington, Calif., refinery to Ultramar PLC, a British-owned international oil company, for approximately $466 million, including inventories.

The refinery produces some 100,000 barrels per day of unleaded gasoline, diesel fuel and other petroleum products, primarily for independent marketers in California, Nevada and Arizona, which Ultramar will continue to serve.Ultramar also plans to offer employment to all personnel associated with the refinery and its administrative and marketing operations.