Atlantic Coastal Zone

round-water resources along the Atlantic coastal zone of the United States are vulnerable to saltwater intrusion and to contamina-tion by nutrients. Saltwater intrusion, the movement of saline water into fresh-water aquifers (fig. 1), is most com-monly caused by ground-water pumping near the coast. Nutrient contamination results from many human activities and has caused widespread increases of nitrate in shallow ground water nation-wide (U.S. Geological Survey, 1999). High salinity or nutrient concentration