An employee had just climbed down from a 6-foot A-frame ladder and was trying to fold it. With both feet firmly on the deck of the barge, the employee took a step back and caught his foot on the lowest rung of the ladder. The employee fell backward and landed on a steel mooring cleat mounted to the outside edge of the barge. The employee then rolled off the barge and into the water 3 feet below. The employee sustained a lower back contusion.