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dc.contributor.authorScorca, Michael P.
dc.contributor.authorReilly, Thomas E.
dc.contributor.authorFranke, O. L.
dc.date.accessioned2021-09-07T20:44:58Z
dc.date.available2021-09-07T20:44:58Z
dc.date.issued1/1/1995
dc.identifier.urihttp://hdl.handle.net/20.500.12648/4141
dc.descriptionUSGS Water-Resources Investigations Report: 92-4171
dc.description.abstractA data-collection site was instrumented on Jones Beach Island, a barrier island south of Long Island, N.Y., to study local freshwater/ saltwater relations in the shallow ground-water system. A geologic test boring revealed about 88 feet of well-sorted glacial outwash sand above about 15 feet of Gardiners Clay, which directly overlies silty sand of the Magothy Formation. Tidal effects on water levels in Great South Bay, the upper glacial aquifer, and the Magothy aquifer were observed and quantified with a tidal gage in the bay and analog water-level recorders in the wells.Chloride concentrations in the upper Magothy aquifer were higher than expected--about 270 mg/L (milligrams per liter), and those in the upper glacial aquifer were 17,000 to 19,000 mg/L, about the same as in Great South Bay. Estimates of pressure and freshwater equivalent heads indicate that, at the data-collection site, freshwater is discharging upward from the Magothy aquifer into the salty upper glacial aquifer, but dilution by this freshwater is undetectable. The reason for the elevated chloride concentration in the Magothy aquifer cannot be determined from available hydrogeologic information.
dc.language.isoen_US
dc.subjectWater Quality
dc.subjectLong Island
dc.subjectGround Water
dc.subjectAquifer
dc.titleSelected Hydrogeologic and Water-quality Data from Jones Beach Island, Long Island, New York
dc.typearticle
refterms.dateFOA2021-09-07T20:44:58Z
dc.description.institutionSUNY Brockport
dc.source.statuspublished
dc.description.publicationtitleGovernment Documents (Water Resources)
dc.contributor.organizationUSGS


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