VICTIM CLIMBED ONTO PIPE TO CLEAR ACTERIAL FORM THE FEED CHUTE. VICTIM SLIPPED AND FELL APPROX. 9 1/2 FT TO THE FLOOR, LANDING ON THIS SIDE. VICTIM RETURNED TO WORK FOR HIS NEXT SHIFT, HOWEVER ON 9-12-01. HE REPORTED THAT HE COULD NOT COME TO WORK AND WAS INSTRUCTED TO SEE A DAY.