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Saltwater Interface Mapping

To improve understanding of the saltwater-transition zone within the Eastern Shore aquifer system, electromagnetic-induction well logging is being used to supplement previous sampling and mapping studies with detailed information about temporal changes in salinity near individual wells.

The configuration of the saltwater-transition zone as described by McFarland and Beach (2019) is based on limited data and is considered to be preliminary. Movement of the saltwater-transition zone is not characterized because most wells are not sampled with adequate frequency. A monitoring strategy using conventional well sampling possibly augmented with electromagnetic-induction well logging could potentially be used to detect changes in the position of the saltwater-transition zone.

USGS hydrologist sampling and logging an Eastern Shore groundwater observation well.

Chloride Wells/Measurements with salinity contours
(Roger Moberg, USGS)

 

Locations and numbers of sampled wells and altitude of the 250-milligram-per-liter chloride-concentration surface on the Virginia Eastern Shore.

Locations and numbers of sampled wells of the 250-milligram-per-liter chloride-concentration surface of Virginia Coastal Plain
(E. Randolph McFarland, USGS)
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