A DRAIN LINE WAS PLUGGED THAT IT USED TO DRAIN THE LEG FROM A SCREENING TANK TO A TRANSFER PUMP THAT PUMPS RESULURRY BACK TO THE #2 HT. WHEN VALVE WAS OPENED, PRODUCT CAM EOUT WITH A FORCE. HE TURNED HIS HEAD AND BACK TO MISS HITTING HIM IN THE FACE BUT THE SLURRY HIT HIM BEHIND THE HEAD AND WENT BETWEEN HIS SAFETY SIDE SHIELDS PACKING HIS EYES AND GLASSES WITH SLURRY. HE WAS TA