A ROCK CAME OUT OF THE CONVEYOR BELT AND THE EE WAS REMOVING IT. HE HURT HIS BACK WHILE DOING THIS. ROCK WAS ESTIMATED TO WEIGH LESS THAT 20 POUNDS. HE CAME BACK TO WORK ON 4-18-2000. WHILE HE LPING 3 OTHER MEN MOVE A ROCK THAT WEIGHED APPROX. 100 POUNDS HE RE-INJURED HIS BACK.