EE WAS CLEANING ON TO THE EXCAVATOR AND HIS FOOT SLIPPED OFF OF THE STEP. THE EE WAS HOLDING ONTO THE RAILING AND WAS SUPPORTING HIS BODY WEIGHT W/ARMS UNTIL ABLE TO PLACE FOOT ONTO STEP AGAIN . THE NEXT DAY EE REPORTED GROIN PAIN. ON 9/14/00 EE WAS DIAGNOSED WITH A HERNIA.