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The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.

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Brown Bullhead from the Ashtabula River Illustrating the External Tumors Observed

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January 1, 2000

Three-dimensional finite-volume F-LLAM implementation Three-dimensional finite-volume F-LLAM implementation

No abstract available.

Authors

C.I. Heberton, T.F. Russell, Leonard F. Konikow, Michelle I. Hornberger

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

January 1, 2000

Thermodynamic properties of environmental arsenic species: Limitations and needs Thermodynamic properties of environmental arsenic species: Limitations and needs

No abstract available.

Authors

D. Kirk Nordstrom

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

CFC tracing of groundwater in fractured rock aided with 14C and 3H to identify water mixing CFC tracing of groundwater in fractured rock aided with 14C and 3H to identify water mixing

No abstract available.

Authors

A.S. Talma, John L. Weaver, L.N. Plummer, Eurybiades Busenberg

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

January 1, 2000

The study of humic substances--In search of a paradigm The study of humic substances--In search of a paradigm

No abstract available.

Authors

Robert L. Wershaw

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Selenium Selenium

No abstract available.

Authors

Ronald S. Oremland

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

January 1, 2000

Nitrate isotopes in groundwater systems Nitrate isotopes in groundwater systems

Nitrate contamination, often associated with agricultural activities, is a major problem in some shallow aquifers and is increasingly becoming a threat to groundwater supplies (Gillham and Cherry, 1978; Ronen et al., 1983; Spalding and Exner, 1991). The intake of high levels of nitrate can cause methemoglobinemia in infants, and there is substantial evidence collected from animal...

Authors

Carol Kendall, Ramon Aravena

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Enhanced levels of zinc in drinking water adversely affect spatial learning in rats Enhanced levels of zinc in drinking water adversely affect spatial learning in rats

No abstract available.

Authors

J.M. Flinn, J. Morgan, J. Magaha, L. Krause, K. Navarrete, B.F. Jones

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Contaminant sorption by soil and bed sediment: Is there a difference? Contaminant sorption by soil and bed sediment: Is there a difference?

No abstract available.

Authors

C. T. Chiou, D. E. Kile

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Estimation of hydraulic parameters from an unconfined aquifer test conducted in a glacial outwash deposit, Cape Cod, Massachusetts Estimation of hydraulic parameters from an unconfined aquifer test conducted in a glacial outwash deposit, Cape Cod, Massachusetts

An aquifer test conducted in a sand and gravel, glacial outwash deposit on Cape Cod, Massachusetts was analyzed by means of a model for flow to a partially penetrating well in a homogeneous, anisotropic unconfined aquifer. The model is designed to account for all significant mechanisms expected to influence drawdown in observation piezometers and in the pumped well. In addition to the...

Authors

A.F. Moench, Stephen P. Garabedian, Denis R. LeBlanc

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Documentation of a computer program to simulate lake-aquifer interaction using the MODFLOW ground water flow model and the MOC3D solute-transport model Documentation of a computer program to simulate lake-aquifer interaction using the MODFLOW ground water flow model and the MOC3D solute-transport model

Heads and flow patterns in surficial aquifers can be strongly influenced by the presence of stationary surface-water bodies (lakes) that are in direct contact, vertically and laterally, with the aquifer. Conversely, lake stages can be significantly affected by the volume of water that seeps through the lakebed that separates the lake from the aquifer. For these reasons, a set of computer

Authors

Michael L. Merritt, Leonard F. Konikow

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Monthly variability and possible sources of nitrate in ground water beneath mixed agricultural land use, Suwannee and Lafayette Counties, Florida Monthly variability and possible sources of nitrate in ground water beneath mixed agricultural land use, Suwannee and Lafayette Counties, Florida

In an area of mixed agricultural land use in Suwannee and Lafayette Counties of northern Florida, water samples were collected monthly from 14 wells tapping the Upper Floridan aquifer during July 1998 through June 1999 to assess hydrologic and land-use factors affecting the variability in nitrate concentrations in ground water. Unusually high amounts of rainfall in September and October...

Authors

Brian G. Katz, J.K. Böhlke

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 2000

Hydrogeologic characterization of six sites in southeastern Minnesota using borehole flowmeters and other geophysical logs Hydrogeologic characterization of six sites in southeastern Minnesota using borehole flowmeters and other geophysical logs

No abstract available.

Authors

Frederick L. Paillet, James Lundy, Robert Tipping, Anthony Runkel, Laurel Reeves, Jeffrey Green

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program