EE WAS ASSISTING IN THE LAUNCH OF A BOAT TO SERVICE PUMPS. HE WAS SITTING ON TRUCK TAILGATE HOLDING THE ROPE UNTIL THE BOAT FLOATED OFF THE TRAILER. HE LOST HIS BALANCE & FELL BACKWARDS INTO TRUCK BED STRIKING LOWER BACK ON SHOVEL. EE REQUUESTED MED ATTENTION 7/17/03 PRE-EXISTING RUPTURED DISC (NON WORK RELATED)