EE WAS WALKING (WITH NO OTHER EE'S) NEAR PILOT PLANT CLARIFICATION EQUIPMENT AND DRAIN SYSTEM, WHEN HE SLIPPED ON A PATCH OF POLYMER NEAR THE PILOT PLANT BELT PRESS AND PLANT DITCH. HE EXPERIE NCED SOME PAIN, RESTED FOR A MINUTE AFTER SLIPPING, THEN PROCEEDED BACK TO HIS VEHICLE TO LEAVE PLANT. AFTER ARRIVING HOME, EE WENT TO E.R. FOR TREATMENT.