ON AUGUST 30, 2001, EE STATES HE PULLED A MUSCLE IN HIS LOWER BACK. PART OF HIS WORK DUTIES DURING THE SHIFT INCLUDED INSTALLING A SHEVE PIN, THROWING A ROCK FEOM THE WALKWAY INTO THE CHAIN LI NE AND CRAWLING AT THE SHIELD AREA. HE ADDED NO SPECIFIC EVENT COULD BE RELATED TO THE INCIDENT.