WAS WALKING DOWN THE CONVEYER AFTER GREASING THE HEAD PULLEY IT WAS REALLY COLD OUTSIDE SO THEIRWAS FROST ON EVERYTHING AND HE SLIPPED AND FELL OFF THE CONVEYER WHERE THE LADDER WAS SET UP ON THE BOTTOM OF THE CATWALK, FALL WAS ABOUT 5-6 FEET FROM GROUND, BRUISED AND SWOLLEN MUSCLES IN HIS BACK.