EE STATED THAT HE FELT PAIN IN LOWER BACK AS HE LIFTED ON A 1/2"" CHAIN TO APPLY AROUND 42"" BELT. HE WAS ASSISTING WITH UNLOADING OF A PIECE OF CONVEYOR BELT BEING DELIVERED TO PREP PLANT. EE CON'T TO WORK UNTIL 3/8/05. TAKEN OFF WORK 3/9/05 TO HAVE SURGERY TO REPAIR HPN L4-5. EE STARTED MISSING WORK ON 3/9/05