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Scientiﬁc monitoring and assessment provide basic characterization of the groundwater resources of an area, an understanding of the different pathways by which saltwater may intrude an aquifer, and a basis for management of water supplies. Water-quality monitoring networks are particularly important in serving as early-warning systems of saltwater movement toward freshwater supply wells, as well as providing information on the rates of saltwater encroachment. Dedicated wells that sample multiple intervals of an aquifer are invaluable for providing a three-dimensional characterization of the extent of saltwater within an aquifer system. (Barlow, P.M., and E.G. Reichard. 2010).