EE STATED WHILE UNLOADING A PIECE OF STEEL, WAS HOLDING END, AND VENDOR KNOCKED THE OTHER END OF TAILGATE AND EE TRIED TO HOLD THE WEIGHT WITH HIS END. EE STATED SHE FELT IMMEDIATE PAIN FOLLOW ING THIS INCIDENT, BUT CONTINUED TO WORK AND REPORTED IT TO SUPERVISOR. ON 3-10-03 EE WAS MOVING SEVERAL 55 GALLON DRUMS FROM PALLETS AND FELT PAIN IN HER BACK AGAIN.