An employee was dumping bags of dry phosphoric acid into a mixer from an elevated platform that was 8-feet, 9-inches high off the ground. A forklift had a pallet of the dry phosphoric acid. The portion calls for 40 bags to be dumped. The pallet was airborne, not sitting on the platform. The employee finished dumping the bags, turned to look for something, and fell between the pallet and the platform. The opening between the pallet and platform was 35 inches. The employee was unconscious and required hospitalization.