EE WAS ATTEMPTING TO DISMOUNT A 789 HAUL TRUCK UTILIZING THE LADDER AND STEPS. AS HE STEPPED FROM THE BUMPER TO THE RUBBER STEPS HE PLACED HIS RIGHT FOOT ON A NUT AND BOLT INSTEAD OF THE RUNG OF THE STEP. WHEN YIS WEIGHT WAS TRANSFERRED TO THE RIGHT FOOT HE FELT A POP. XRAYS REVEALED A FRACTURED BONE IN HIS RIGHT FOOT.