EMPLOYEE WAS USING A SLEDGE HAMMER TO REMOVE A PIN FROM A SCOOP JACK. WHILE PERFORMING THIS TASK HE FELT PAIN IN HIS BACK. HE REPORTED THE INCIDENT, & A FIRST REPORT OF INJURY WAS GENERATED. THE PAIN SUBSIDED, HE ELECTED NOT TO SEE A DR. EMPLOYEE CONTINUED TO WORK UNTIL 8/9/04 WHEN THE PAIN RETURNED, HE DECIDED TO SEE A DR. WHO TOOK HIM OFF WORK.