The senior management and staff of an Aus-tin Co. unit whose troubled project helped push Austin into bankruptcy has been hired by Walbridge Aldinger, the Detroit-based construction firm. Pittsburgh-based Ragnar Benson PA Inc. will become a new operating subsidiary of Walbridge Aldinger, and will be known as Walbridge RB, says company President Richard Haller. Ragnar Benson PA is in litigation with Old Dominion Electric Cooperative over the 510-MW Marsh Run powerplant near Remington, Va. RB PA is seeking additional payments. Old Dominion blames RB PA for lateness and wants liquidated damages.