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GeoHEALTH-USGS Newsletter

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March 1, 1999

Integrating surface and borehole geophysics in ground water studies: An example using electromagnetic soundings in south Florida Integrating surface and borehole geophysics in ground water studies: An example using electromagnetic soundings in south Florida

Time domain surface electromagnetic soundings, borehole induction logs, and other borehole logging techniques are used to construct a realistic model for the shallow subsurface hydraulic properties of unconsolidated sediments in south Florida. Induction logs are used to calibrate surface induction soundings in units of pore water salinity by correlating water sample specific electrical

Authors

Frederick Paillet, Laura Hite, Matthew Carlson

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

February 1, 1999

Comment on “Field study of spatial variability in unsaturated flow beneath and adjacent to playas” by Bridget R. Scanlon and Richard S. Goldsmith Comment on “Field study of spatial variability in unsaturated flow beneath and adjacent to playas” by Bridget R. Scanlon and Richard S. Goldsmith

The Scanlon and Goldsmith [1997] paper contains a wealth of data that provides a useful contribution to the understanding of the spatial variability of matrix recharge in and around playa basins on the Southern High Plains. However, a significant clarification is necessary in the analysis of their "water flux" because in this system "water flux" must be placed in the context of both...

Authors

Warren W. Wood

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 27, 1999

Double-disk solid-phase extraction--Simultaneous cleanup and trace enrichment of herbicides and metabolites from environmental samples Double-disk solid-phase extraction--Simultaneous cleanup and trace enrichment of herbicides and metabolites from environmental samples

Phenylurea and triazine herbicides, including some metabolites, were isolated from water and soil extracts by solid-phase extraction using a layered system of two extraction disks, a method called double-disk solid-phase extraction. The first disk consisted of strong anion exchange (SAX) of 10-μm styrene divinylbenzene (SDB) particles embedded in Teflon, and the second disk was a C18...

Authors

Imma Ferrar, Damia Barcelo, E.M. Thurman

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1999

Radiotracer studies of bacterial methanogenesis in sediments from the Dead Sea and Solar Lake (Sinai) Radiotracer studies of bacterial methanogenesis in sediments from the Dead Sea and Solar Lake (Sinai)

No abstract available.

Authors

Mark Marvin-DePasquale, Yoram. Geological Survey Cohen, Ronald S. Oremland, A. Oren

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1999

Hydrogeologic structure of the Newark Basin, Pennsylvania, from borehole geophysical logs Hydrogeologic structure of the Newark Basin, Pennsylvania, from borehole geophysical logs

The Brunswick and the underlying Lockatong Formations are comprised of littrifled Mesozoic sediments that constitute part of the Newark Basin in southeastern Pennsylvania (USA). These fractured rocks form an important regional aquifer that consists of gmdational sequences of shale, siltstone, and sandstone, with fluid transport occurring primarily in fractures. An extensive suite of...

Authors

R. H. Morin, L.A. Senior, E.R. Decker

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Pennsylvania Water Science Center

January 1, 1999