EMPLOYEE WAS HOOKING UP A DISCHARGE LINE ON A BARGE PUMP. HE HAD MUD ON HIS BOOTS. HE SLIPPED AS HE WAS STEPPING OFF OF THE PUMP BASE AND FELL ONTO HIS BACK AND BOTH ELBOWS. THE INCIDENT OCCURRED ON 7/11/05 BUT IT WAS NOT REPORTED UNTIL THE EVENING OF 7/26/05. AT THAT TIME THE EMPLOYEE WAS IN ER. HE WAS DISCHARGED FROM HOSPITAL ON 7/29/05 & RTW ON 8/1/05 MISSING 3 DAYS.