EE STATES THAT ON 1-24-02, HE WAS WORKING AS A ROCK DUSTER AND AS HE WAS DRAGGING THE HOSE HIS LT. FOOT BECAME STUCK IN THE MUD AND AS HE PULLED FREE HE FELT A PAIN IN HIS LOWER BACK. HE COMP LETED HIS SHIFT AND THEN WORKED HIS NEXT SCHEDULED SHIFT ON 1-28-02, THEN BEGAN MISSING WORK ON 1-29-02.