Laura M. Bexfield (Former Employee)
Science and Products
Filter Total Items: 15
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Filter Total Items: 45
Effects of natural and human factors on groundwater quality of basin-fill aquifers in the southwestern United States: Conceptual models for selected contaminants
As part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program, the Southwest Principal Aquifers (SWPA) study is building a better understanding of the factors that affect water quality in basin-fill aquifers in the Southwestern United States. The SWPA study area includes four principal aquifers of the United States: the Basin and Range basin-fill aquifers in...
Authors
Laura M. Bexfield, Susan A. Thiros, David W. Anning, Jena M. Huntington, Tim S. McKinney
Conceptual understanding and groundwater quality of selected basin-fill aquifers in the Southwestern United States
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey has been conducting a regional analysis of water quality in the principal aquifer systems in the southwestern United States (hereinafter, “Southwest”) since 2005. Part of the NAWQA Program, the objective of the Southwest Principal Aquifers (SWPA) study is to develop a better understanding of water quality...
Authors
Susan A. Thiros, Laura M. Bexfield, David W. Anning, Jena M. Huntington
Southwest principal aquifers regional ground-water quality assessment
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey is conducting a regional analysis of water quality in the principal aquifers in the southwestern United States. The Southwest Principal Aquifers (SWPA) study is building a better understanding of the susceptibility and vulnerability of basin-fill aquifers in the region to ground-water contamination by...
Authors
D.W. Anning, Susan A. Thiros, L. M. Bexfield, T.S. McKinney, J.M. Green
Potential Chemical Effects of Changes in the Source of Water Supply for the Albuquerque Bernalillo County Water Utility Authority
Chemical modeling was used by the U.S. Geological Survey, in cooperation with the Albuquerque Bernalillo County Water Utility Authority (henceforth, Authority), to gain insight into the potential chemical effects that could occur in the Authority's water distribution system as a result of changing the source of water used for municipal and industrial supply from ground water to surface...
Authors
Laura M. Bexfield, Scott K. Anderholm
Low-Level detections of halogenated volatile organic compounds in groundwater: Use in vulnerability assessments
Concentrations of halogenated volatile organic compounds (VOCs) were determined by gas chromatography (GC) with an electron-capture detector (GC-ECD) and by gas chromatography with mass spectrometry (GC-MS) in 109 groundwater samples from five study areas in the United States. In each case, the untreated water sample was used for drinking-water purposes or was from a monitoring well in...
Authors
Niel Plummer, Eurybiades Busenberg, S.M. Eberts, L. M. Bexfield, C. Titus Brown, L.S. Fahlquist, B. G. Katz, Matthew K. Landon
Decadal-scale changes of pesticides in ground water of the United States, 1993-2003
Pesticide data for ground water sampled across the United States between 1993-1995 and 2001-2003 by the U.S. Geological Survey National Water-Quality Assessment Program were evaluated for trends in detection frequency and concentration. The data analysis evaluated samples collected from a total of 362 wells located in 12 local well networks characterizing shallow ground water in...
Authors
L. M. Bexfield
Geochemical characterization of ground-water flow in the Santa Fe Group aquifer system, Middle Rio Grande Basin, New Mexico
Chemical and isotopic data were obtained from ground water and surface water throughout the Middle Rio Grande Basin (MRGB), New Mexico, and supplemented with selected data from the U.S. Geological Survey (USGS) National Water Information System (NWIS) and City of Albuquerque water-quality database in an effort to refine the conceptual model of ground-water flow in the basin. The ground...
Authors
Niel Plummer, Laura M. Bexfield, Scott K. Anderholm, Ward E. Sanford, Eurybiades Busenberg
Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico
No abstract available.
Authors
Niel Plummer, Ward E. Sanford, Laura M. Bexfield, Scott K. Anderholm, Eurybiades Busenberg
Simulated effects of projected ground-water withdrawals by the city of Albuquerque, 2004-40, for reduced water use per person
No abstract available.
Authors
Laura M. Bexfield, Douglas P. McAda
Simulation-optimization approach to management of ground-water resources in the Albuquerque area, New Mexico, 2006 through 2040
No abstract available.
Authors
Laura M. Bexfield, Wesley R. Danskin, Douglas P. McAda
Use of environmental tracers to estimate parameters for a predevelopment-ground-water-flow model of the Middle Rio Grande Basin, New Mexico
No abstract available.
Authors
Ward E. Sanford, Niel Plummer, Douglas P. McAda, Laura M. Bexfield, Scott K. Anderholm
Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model
The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow system. Earlier models of the basin had difficulty reproducing these features without any hydrochemical...
Authors
Ward E. Sanford, Niel Plummer, D. P. McAda, L. M. Bexfield, Scott K. Anderholm
Science and Products
Filter Total Items: 15
No Result Found
Filter Total Items: 45
Effects of natural and human factors on groundwater quality of basin-fill aquifers in the southwestern United States: Conceptual models for selected contaminants
As part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program, the Southwest Principal Aquifers (SWPA) study is building a better understanding of the factors that affect water quality in basin-fill aquifers in the Southwestern United States. The SWPA study area includes four principal aquifers of the United States: the Basin and Range basin-fill aquifers in...
Authors
Laura M. Bexfield, Susan A. Thiros, David W. Anning, Jena M. Huntington, Tim S. McKinney
Conceptual understanding and groundwater quality of selected basin-fill aquifers in the Southwestern United States
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey has been conducting a regional analysis of water quality in the principal aquifer systems in the southwestern United States (hereinafter, “Southwest”) since 2005. Part of the NAWQA Program, the objective of the Southwest Principal Aquifers (SWPA) study is to develop a better understanding of water quality...
Authors
Susan A. Thiros, Laura M. Bexfield, David W. Anning, Jena M. Huntington
Southwest principal aquifers regional ground-water quality assessment
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey is conducting a regional analysis of water quality in the principal aquifers in the southwestern United States. The Southwest Principal Aquifers (SWPA) study is building a better understanding of the susceptibility and vulnerability of basin-fill aquifers in the region to ground-water contamination by...
Authors
D.W. Anning, Susan A. Thiros, L. M. Bexfield, T.S. McKinney, J.M. Green
Potential Chemical Effects of Changes in the Source of Water Supply for the Albuquerque Bernalillo County Water Utility Authority
Chemical modeling was used by the U.S. Geological Survey, in cooperation with the Albuquerque Bernalillo County Water Utility Authority (henceforth, Authority), to gain insight into the potential chemical effects that could occur in the Authority's water distribution system as a result of changing the source of water used for municipal and industrial supply from ground water to surface...
Authors
Laura M. Bexfield, Scott K. Anderholm
Low-Level detections of halogenated volatile organic compounds in groundwater: Use in vulnerability assessments
Concentrations of halogenated volatile organic compounds (VOCs) were determined by gas chromatography (GC) with an electron-capture detector (GC-ECD) and by gas chromatography with mass spectrometry (GC-MS) in 109 groundwater samples from five study areas in the United States. In each case, the untreated water sample was used for drinking-water purposes or was from a monitoring well in...
Authors
Niel Plummer, Eurybiades Busenberg, S.M. Eberts, L. M. Bexfield, C. Titus Brown, L.S. Fahlquist, B. G. Katz, Matthew K. Landon
Decadal-scale changes of pesticides in ground water of the United States, 1993-2003
Pesticide data for ground water sampled across the United States between 1993-1995 and 2001-2003 by the U.S. Geological Survey National Water-Quality Assessment Program were evaluated for trends in detection frequency and concentration. The data analysis evaluated samples collected from a total of 362 wells located in 12 local well networks characterizing shallow ground water in...
Authors
L. M. Bexfield
Geochemical characterization of ground-water flow in the Santa Fe Group aquifer system, Middle Rio Grande Basin, New Mexico
Chemical and isotopic data were obtained from ground water and surface water throughout the Middle Rio Grande Basin (MRGB), New Mexico, and supplemented with selected data from the U.S. Geological Survey (USGS) National Water Information System (NWIS) and City of Albuquerque water-quality database in an effort to refine the conceptual model of ground-water flow in the basin. The ground...
Authors
Niel Plummer, Laura M. Bexfield, Scott K. Anderholm, Ward E. Sanford, Eurybiades Busenberg
Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico
No abstract available.
Authors
Niel Plummer, Ward E. Sanford, Laura M. Bexfield, Scott K. Anderholm, Eurybiades Busenberg
Simulated effects of projected ground-water withdrawals by the city of Albuquerque, 2004-40, for reduced water use per person
No abstract available.
Authors
Laura M. Bexfield, Douglas P. McAda
Simulation-optimization approach to management of ground-water resources in the Albuquerque area, New Mexico, 2006 through 2040
No abstract available.
Authors
Laura M. Bexfield, Wesley R. Danskin, Douglas P. McAda
Use of environmental tracers to estimate parameters for a predevelopment-ground-water-flow model of the Middle Rio Grande Basin, New Mexico
No abstract available.
Authors
Ward E. Sanford, Niel Plummer, Douglas P. McAda, Laura M. Bexfield, Scott K. Anderholm
Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model
The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow system. Earlier models of the basin had difficulty reproducing these features without any hydrochemical...
Authors
Ward E. Sanford, Niel Plummer, D. P. McAda, L. M. Bexfield, Scott K. Anderholm