These documents resulted from a summer 2013 internship for a OSU Systems Engineering student. Mr. Applegate was charged with documenting the existing seawater system at the Hatfield Marine Science Center and recommending efficiency upgrades. He produced a written report with various appendices containing system documentation and recommendations and a map. The following includes brief overview of the Hatfield Marine Science Center’s development and use of seawater. The users and their requirements are described, as well as a walk-through of the operations of the system that delivers the seawater. There are numerous recommendations for taking advantage of energy and/or cost saving opportunities, most can be done independently at any time.