EE WAS HOLDING A COPING TOOL AGAINST A PIECE OF STONE WHILE CO-WORKER HIT THE COPING TOOL WITH A SLEDGE HAMMER TO SCORE THE STONE. CO-WORKER HIT THE EDGE OF THE COPING TOOL AND A SMALL PIECE O F METAL CHIPPED OFF THE SLEDGE HAMMER. THE PIECE HIT EE IN THE LEFT FOREARM AND BECAME EMBEDDED.