EE STATED THAT HE WAS HELPING INSTALL A SET OF TIRE CHAINS ON THE FRONT WHEELS OF A FRONT END LOADER. WHILE DRIVING A PIN INTO THE TIRE CHAINS WITH A HAMMER, A SMALL PIECE OF METAL FLEW OFF ST RIKING AND BECOMEING EMBEDDED IN THE EE'S LEFT LEG, METAL WAS REMOVED FROM HIS LEG BY A PHYSICIAN.