EE ARRIVED AT PARKING LOT IN PERSONAL VEHICLE REPORTING TO WORK. HE WAS WALKING FROM HIS VEHICLE TO THE BATHHOUSE WHEN HE SLIPPED AND FELL AGGRAVATING A PREVIOUS EXISTING LOWER BACK INJURY. (W AS CONTINUING TO TAKE MEDICINE). HE CONTINUED TO WORK AND BEGAN MISSING WORK 3-14-2001 AFTER DR. EXAM.