THE JOB ASSISGNED WAS FOR EE AND OTHER TO REMOVE THE SCAFFOLDING SECITON OFF OF THE PREHEATER TOWER. THE AREA BY THE PREHEATER TOWER HAD A 2-3' INCURE. OTHER WAS LOWERING THEM DOWN BY ROPE AND EE WAS UNTRYING THE TOPE AND CARRYING THEM TO A LEVER AREA SO THEY COULD BE USED LATER. HE WAS CARRYING ONE SET OF SCAFFOLING WHEN HE SLIPPED AND FELL. HE FELT PAIN IN HIS RIGHT KNEE AND BACK