THE EMPLOYEE WAS ON A 6"" LADDER, 2-3' ABOVE THE DECK UNWIRING THE MOTOR ON A RECLAIM PUMP IN PREPARATION FOR REMOVAL AND INSPECTION. THE CHECK VALVE ON A HIGH PRESSURE WATER LINE FAILED RESULT ING IN WATER SPRAYING THE AREA. THE EMPLOYEE WAS STRUCK BY THE PRESSURIZED WATER AND KNOCKED OFF THE LADDER LANDING ON HIS RIGHT BUTTOCK. HE WENT TO THE EMERGENCY ROOM ON 1-14-2000 AND A COUR