EMPLOYEE STATES HE WAS TRANSPORTING PELLET PALLETS TO SOUTH DOCK STORAGE AREA WHEN THE FORK TRUCK HE WAS OPERATING CONTACTED A DEPRESSION IN THE ASPHALT PAVEMENT. THE CONTACT WITH THE DEPRESSI ON RESULTED IN A SUDDEN TWISTING MOVEMENT OF HIS UPPER BODY THAT RESULTED IN LOWER BACK PAIN AND DISCOMFORT.