EE SPRAINED HIS RIGHT ELBOW WHILE BEATING ON A BIN WITH A 8 LB SLEDGE HAMMER. HE WAS BEATING ONTHE BIN TO BREAK LOOSE CRUSHED STONE TO ALLOW ITTO FLOW INTO A HAUL UNIT. HE USED THE HAMMER FOR ABOUT 5 MINUTES BEFORE HE CLAIMS HE FELT PAIN INHIS ELBOW. HE WAS RELEASED TO RETURN TO LIGHT DUTY BY HIS PHYSICIAN.