Bryant C Jurgens
Groundwater is an important source of drinking water in the United States. In order to assess the status and long-term sustainability of this important resource, I use environmental tracers, geochemical modeling, and statistical methods to understand the age structure, geochemical processes, and trends affecting water-quality in aquifers.
Science and Products
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Comparison of particle-tracking and lumped-parameter age-distribution models for evaluating vulnerability of production wells to contamination Comparison of particle-tracking and lumped-parameter age-distribution models for evaluating vulnerability of production wells to contamination
Environmental age tracers have been used in various ways to help assess vulnerability of drinking-water production wells to contamination. The most appropriate approach will depend on the information that is available and that which is desired. To understand how the well will respond to changing nonpoint-source contaminant inputs at the water table, some representation of the...
Authors
S. M. Eberts, J.K. Böhlke, L. J. Kauffman, B.C. Jurgens
Status and understanding of groundwater quality in the northern San Joaquin Basin, 2005: California GAMA Priority Basin Project Status and understanding of groundwater quality in the northern San Joaquin Basin, 2005: California GAMA Priority Basin Project
Groundwater quality in the 2,079 square mile Northern San Joaquin Basin (Northern San Joaquin) study unit was investigated from December 2004 through February 2005 as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Project was developed in response to the Groundwater Quality Monitoring Act of 2001 that was...
Authors
George L. V Bennett, Miranda S. Fram, Kenneth Belitz, Bryant C. Jurgens
Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States
Depth-dependent water-quality and borehole flow data were used to determine where and how contamination enters public-supply wells (PSWs) at study sites in different principal aquifers of the United States. At each of three study sites, depth-dependent samples and wellbore flow data were collected from multiple depths in selected PSWs under pumping conditions. The chemistry of these...
Authors
Matthew K. Landon, Bryant C. Jurgens, Brian G. Katz, Sandra M. Eberts, Karen R. Burow, Christy A. Crandall
Status and understanding of groundwater quality in the central-eastside San Joaquin Basin, 2006: California GAMA Priority Basin Project Status and understanding of groundwater quality in the central-eastside San Joaquin Basin, 2006: California GAMA Priority Basin Project
Groundwater quality in the approximately 1,695-square-mile Central Eastside San Joaquin Basin (Central Eastside) study unit was investigated as part of the Priority Basin Project (PBP) of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA PBP was developed in response to the California Groundwater Quality Monitoring Act of 2001, and is being conducted by the...
Authors
Matthew K. Landon, Kenneth Belitz, Bryant C. Jurgens, Justin T. Kulongoski, Tyler D. Johnson
Estimation of aquifer scale proportion using equal area grids: assessment of regional scale groundwater quality Estimation of aquifer scale proportion using equal area grids: assessment of regional scale groundwater quality
The proportion of an aquifer with constituent concentrations above a specified threshold (high concentrations) is taken as a nondimensional measure of regional scale water quality. If computed on the basis of area, it can be referred to as the aquifer scale proportion. A spatially unbiased estimate of aquifer scale proportion and a confidence interval for that estimate are obtained...
Authors
Kenneth Belitz, Bryant C. Jurgens, Matthew K. Landon, Miranda S. Fram, Tyler D. Johnson
Redox Conditions in Selected Principal Aquifers of the United States Redox Conditions in Selected Principal Aquifers of the United States
Reduction/oxidation (redox) processes affect the quality of groundwater in all aquifer systems. Redox processes can alternately mobilize or immobilize potentially toxic metals associated with naturally occurring aquifer materials, contribute to the degradation or preservation of anthropogenic contami-nants, and generate undesirable byproducts, such as dissolved manganese (Mn2+), ferrous...
Authors
P.B. McMahon, T.K. Cowdery, F. H. Chapelle, B.C. Jurgens
Science and Products
Filter Total Items: 21
No Result Found
Filter Total Items: 60
Comparison of particle-tracking and lumped-parameter age-distribution models for evaluating vulnerability of production wells to contamination Comparison of particle-tracking and lumped-parameter age-distribution models for evaluating vulnerability of production wells to contamination
Environmental age tracers have been used in various ways to help assess vulnerability of drinking-water production wells to contamination. The most appropriate approach will depend on the information that is available and that which is desired. To understand how the well will respond to changing nonpoint-source contaminant inputs at the water table, some representation of the...
Authors
S. M. Eberts, J.K. Böhlke, L. J. Kauffman, B.C. Jurgens
Status and understanding of groundwater quality in the northern San Joaquin Basin, 2005: California GAMA Priority Basin Project Status and understanding of groundwater quality in the northern San Joaquin Basin, 2005: California GAMA Priority Basin Project
Groundwater quality in the 2,079 square mile Northern San Joaquin Basin (Northern San Joaquin) study unit was investigated from December 2004 through February 2005 as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Project was developed in response to the Groundwater Quality Monitoring Act of 2001 that was...
Authors
George L. V Bennett, Miranda S. Fram, Kenneth Belitz, Bryant C. Jurgens
Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States
Depth-dependent water-quality and borehole flow data were used to determine where and how contamination enters public-supply wells (PSWs) at study sites in different principal aquifers of the United States. At each of three study sites, depth-dependent samples and wellbore flow data were collected from multiple depths in selected PSWs under pumping conditions. The chemistry of these...
Authors
Matthew K. Landon, Bryant C. Jurgens, Brian G. Katz, Sandra M. Eberts, Karen R. Burow, Christy A. Crandall
Status and understanding of groundwater quality in the central-eastside San Joaquin Basin, 2006: California GAMA Priority Basin Project Status and understanding of groundwater quality in the central-eastside San Joaquin Basin, 2006: California GAMA Priority Basin Project
Groundwater quality in the approximately 1,695-square-mile Central Eastside San Joaquin Basin (Central Eastside) study unit was investigated as part of the Priority Basin Project (PBP) of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA PBP was developed in response to the California Groundwater Quality Monitoring Act of 2001, and is being conducted by the...
Authors
Matthew K. Landon, Kenneth Belitz, Bryant C. Jurgens, Justin T. Kulongoski, Tyler D. Johnson
Estimation of aquifer scale proportion using equal area grids: assessment of regional scale groundwater quality Estimation of aquifer scale proportion using equal area grids: assessment of regional scale groundwater quality
The proportion of an aquifer with constituent concentrations above a specified threshold (high concentrations) is taken as a nondimensional measure of regional scale water quality. If computed on the basis of area, it can be referred to as the aquifer scale proportion. A spatially unbiased estimate of aquifer scale proportion and a confidence interval for that estimate are obtained...
Authors
Kenneth Belitz, Bryant C. Jurgens, Matthew K. Landon, Miranda S. Fram, Tyler D. Johnson
Redox Conditions in Selected Principal Aquifers of the United States Redox Conditions in Selected Principal Aquifers of the United States
Reduction/oxidation (redox) processes affect the quality of groundwater in all aquifer systems. Redox processes can alternately mobilize or immobilize potentially toxic metals associated with naturally occurring aquifer materials, contribute to the degradation or preservation of anthropogenic contami-nants, and generate undesirable byproducts, such as dissolved manganese (Mn2+), ferrous...
Authors
P.B. McMahon, T.K. Cowdery, F. H. Chapelle, B.C. Jurgens