EMPLOYEE SLIPPED ON SAND WHILE WALKING IN THE FEED END AREA OF THE PLANT. HE REPORTED IT TO THE SUPERVISOR WHO TOOK HIM TO THE FIRST AID ROOM. HE WAS ABLE TO WALK AND FUNCTION NORMALLY. THE NEXT DAY (HIS OFF DAY) HE HAD LEG PAIN AND WENT TOT HE LOCAL E.R. HE WAS DIAGNOSED WITH A MILD STRAIN OF RIGHT THIGH AND THE DOCTOR WROTE AN EXCUSE FOR 7 DAYS REST. COMPANY NOTIFIED 1-3-02.