The R/V Lake Guardian (ex: Marsea XIV) is, at 180 x 40 ft., the U.S. Environmental Protection Agency's largest research and monitoring vessel, and is operated by EPA's Chicago-based Great Lakes National Program Office.?? The Lake Guardian is in its eighteenth season in the Great Lakes, and has been used, extensively, to support monitoring and research activities ranging from investigations of toxic contaminants to the health of the biological communities of the lakes. The EPA continues to use the R/V Lake Guardian to support a wide range of research activities conducted by Federal…