EMPLOYEE WAS CARRYING A BULK BAG OF CLAY WITH A FORKLIFT. THE BULK BAG WEIGHING 600 LBS SHIFTED ON THE PALLET. HE REPORTEDLY TRIED TO PUSH THE BAG BACK INTO PLACE, WHEN HE FELT PAIN IN HIS ABDOMEN. HE REPORTED ALLEGED ACCIDENT ON 8/15/05. HE WAS TAKEN TO DOCTOR ON 8/30/05 AT WHICH TIME HE WAS PLACED ON RESTRICTED DUTY