EE AND ONE COWORKER WERE INSTALLING PIPE. A MONORAIL HAD BEEN CUT OFF TO ACCOMMODATE THE ROUTE THE PIPE HAD TO TAKE. EE AND COWORKER LEFT TO RETRIEVE A 1-TON CHAIN FROM THE OTHER END OF THE MONORAIL. UPON THEIR RETURN, THEY PASSED UNDER THE CUT OFF END OF THE MONORAIL, AND A SECOND CHAINFALL ATTACHED TO A DOLLY CAME OFF, STRIKING THE EE IN THE BRIDGE OF THE NOSE.