EE STATED HE WAS ASSISTING COWORKERS IN SETTING TIMBERS. WHEN HELPING TO LIFT ONE OF THE TIMBERS, HE EXPERIENCEWD PAIN IN THE RIGHT SIDE OF THE ABDOMEN. HE UNDERWENT HERNIA SURGERY IN MARCH 20 00 AND RETURNED TO WORK JANUARY 15, 2001. THE EE HAS A HISTORY OF ABDOMINAL PAIN WHEN EXERTING HIMSELF ACCORDING TO RECORDS. THEREFORE, THE EXPERIENCE WITH ABDOMEN PAIN IS NOT THE RESULT OF A