EE NOTIFIED EMPLOYER ON 7/23/02 THAT ACCORDING TO HIS DR., HIS PREVIOUS NECK INJURY WAS AGGRAVATED BY AN INCIDENT OCCURRING ON 5/24/02. ACCORDING TO THE EE, HE WAS OPERATING A HAULER & HE WAS DUMPING THE LOAD ON A STEEP GRADE. THE LOAD DUMPED OUT QUICKLY CAUSING THE HAULER BED TO MOVE UP AND THEN BACK RATHER QUICKLY. THIS CAUSED THE HAULER TO JAR THE EE'S NECK.