EE WAS WORKING IN FRONT OF THE CRUSHER DUMP BOX ON A ""CRUSHER DOWN DAY"". A BERM OF MATERIAL HAD BEEN PILED IN FRONT OF THE BOX TO PREVENT DUMPING. EE WALKED ON THE BERM AND SLIPPED, CATCHING H IMSELF WITH HIS RIGHT ARM. HE JAMMED HIS RT SHOULDER AND ROTATOR CUFF. NO MEDICAL TREATMENT UNTIL 6-19-01.