EMPLOYEES WERE ATTEMPTING TO CLEAN OUT A SAND SAMPLER 2"" PIPE OF WET SAND, ONE EMPLOYEE WAS UP ONE LEVEL AND OTHER EMPLOYEE WAS AT BOTTOM OF THE PIPE TO BE CLEANED OUT. AS UPPER EMPLOYEE WAS RODDING OUT WET MATERIAL BAR SLIPPED FROM HIS HANDS AND IN DOING SO LOWER PERSON WAS HIT WITH BAR ON HIS LEFT INDEX FINGER.