EE WAS DISMOUNTING A HAUL TRUCK. AS HE STEPPED ON THE GROUND HE FELT A POP IN HIS LOWER BACK. HE FELT NO PAIN AT THE TIME, SO HE FAILED TO REPORT IT TO HIS SUPERVISOR. AFTER HE ARRIVED HOME, H IS BACK STARTED HURTING. HE REPORTED THE INCIDENT TO HIS SUPERVISOR WHEN HE REPORTED TO WORK HIS NEXT SHIFT.