EE WAS WASHING IN THE SAMPLE HOUSE ON THE SURFACE AT THE PREPARATION PLANT. HE WAS PULLING THE HOSE FROM THE 2ND FLOOR TO THE 3RD FLOOR, HIS FOOT SLIPPED ON ONE OF THE STEP TREADS AND CAUSED H IM TO LOSE HIS BALANCE AND SLIP. HE PUT HIS HAND OUT IN FRONT OF HIM AND INJURED HIS HAND. DID NOT RECEIVE ACCIDENT REPORT UNTIL 3-20-01.