EE SUSTAINED A HERNIA WHILE PULLING A WRENCH TO TIGHTEN BOLTS ONTHE WASH SCREEN. HE WAS WORKING ON THE NIGHT SHIFT AT THE WASH SCREEN WHILE PULLING ON THE WRENCH HE FELT A PAIN IN HIS ABDOMINA L REGION. HE REPORTED THE INJURY TO OTHER EE, LEADMAN DID NOT NOTIFY THE FORMAN, ANOTHER EE UNTIL 2-12-02. EE REPORTED TO WORK ONT HAT DATE WITH A NOTE FROM HIS OWNER PUTTING HIM ON LIGHT DUT