EE WAS OPERATING A FAIRCHILD 35C SCOOP, CLEANINGROADWAYS ON THE CONSTRUCTION AREA OF THE NEW #1 SECTION. HE WAS TRAMMING THE SCOOP IN REVERSE WHEN THE OPERATOR SIDE REAR TIRE RAN OVER AN OLD TIMBER LYING IN THE ROADWAY. THE END OF THE TIMBER CAME UP INTO THE DECK AND STRUCK EE IN THE RIBS.