EE WAS HOOKING A CHAIN FROM THE SAMPLE BIN TO THE UNILOADER TO DUMP THE SAMPLE BIN WHEN THIS INCIDENT OCCURRED. A 988 END LOADER BACKED INTO THE UNILOADER CAUSING THE SAMPLE BOX TO FLIP UP AND STRIKE EE IN THE FACE. THE END LOADER OPERATOR WAS UNAWARE THAT HE HAD HIT THE UNILOADER AND PUSHED IT SIDEWAYS 4 OR 5 FEET. THIS INCIDENT CAUSED LACERATIONS TO EE'S GUN, NOSE AND UPPER LIP.