EE WAS ASKED TO SHOVEL CLINKER OUT OF KILN BASEMENT AND PUT SLINKER IN WHEELBARROW. EE REPORTED THAT HE FELT A PAIN IN HIS LOWER BACK WHEN THE WHEELBARROW WAS ABOUT HALF FULL. HE SAID HE DID N OT TWIST OR DO ANYTHING THAT HE KNOWS OF TO CAUSE THE INJURY.