No. 84-7556. Argued and Submitted June 5, 1985. Decided September 4, 1987. Kenneth J. Pederson and David E. Williams, Richland, Wash., Gary P. Scholick and Richard N. Hill, San Francisco, Cal., for respondents. Kenneth Hipp and Collis Suzanne Stocking, Washington, D.C., for petitioner. On Application for Enforcement of an Order of the National Labor Relations Board. Before HUG, FARRIS and BOOCHEVER, Circuit Judges. HUG, Circuit Judge: The National Labor Relations Board (the "Board") applies for enforcement