ON 8/13/04, A WASH PLANT MAINTENANCE WORKER WAS ASSISTING WITH REMOVING AND REPLACING THE GUIDE RAILS FOR THE DRAG CHAIN CONVEYOR IN THE VESSEL LOCATED ON THE FOURTH FLOOR OF THE WASH PLANT. AS HE ATTEMPTED TO REMOVE A PIECE OF GUIDE RAIL HE SMASHED HIS RIGHT INDEX FINGER BETWEEN THE GUIDE RAIL AND A CHAIN CONVEYOR FLIGHT.