IST personnel have focused experience studying surface water issues including littoral transport; thermal discharge; flow; tidal; aquatic toxicity; and sediment modeling in river, lake, marine, and estuarine systems. Projects have included numerous nuclear power plant studies for siting, upgrades, and withdrawal/discharge permits as well as involvement with total maximum daily load (TMDL) development for PCBs in the Delaware River Estuary. IST staff have represented the United States in global transboundary watershed manager symposia and have been recently published in this field. In addition, IST staff have been requested to speak at U.S. EPA-sponsored Regional Watershed Managers meetings held on this subject. IST maintains regional and international contacts regarding watershed management issues and also has alliances with several consulting firms that complement our capabilities in the areas of surface water flow modeling.