Peter B McMahon (Former Employee)
Science and Products
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The quality of our Nation's waters: Water quality in principal aquifers of the United States, 1991-2010 The quality of our Nation's waters: Water quality in principal aquifers of the United States, 1991-2010
About 130 million people in the United States rely on groundwater for drinking water, and the need for high-quality drinking-water supplies becomes more urgent as our population grows. Although groundwater is a safe, reliable source of drinking water for millions of people nationwide, high concentrations of some chemical constituents can pose potential human-health concerns. Some of...
Authors
Leslie A. DeSimone, Peter McMahon, Michael Rosen
Quality and age of shallow groundwater in the Bakken Formation production area, Williston Basin, Montana and North Dakota Quality and age of shallow groundwater in the Bakken Formation production area, Williston Basin, Montana and North Dakota
The quality and age of shallow groundwater in the Bakken Formation production area were characterized using data from 30 randomly distributed domestic wells screened in the upper Fort Union Formation. Comparison of inorganic and organic chemical concentrations to health based drinking-water standards, correlation analysis of concentrations with oil and gas well locations, and isotopic...
Authors
Peter McMahon, Rodney Caldwell, Joel Galloway, Joshua F. Valder, Andrew Hunt
Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado
Reliably identifying the effects of energy development on groundwater quality can be difficult because baseline assessments of water quality completed before the onset of energy development are rare and because interactions between hydrocarbon reservoirs and aquifers can be complex, involving both natural and human processes. Groundwater age and mixing data can strengthen interpretations...
Authors
Peter McMahon, Judith Thomas, Andrew Hunt
Chemistry and age of groundwater in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2010-12 Chemistry and age of groundwater in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2010-12
Fourteen monitoring wells completed in the Uinta and Green River Formations in the Piceance Creek and Yellow Creek watersheds in Rio Blanco County, Colorado, were sampled for chemical, isotopic, and groundwater-age tracers to provide information on the overall groundwater quality, the occurrence and distribution of chemicals that could be related to the development of underlying natural...
Authors
P.B. McMahon, J.C. Thomas, A.G. Hunt
Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12 Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12
Fourteen monitoring wells were sampled by the U.S. Geological Survey, in cooperation with the Bureau of Land Management, to better understand the chemistry and age of groundwater in the Piceance structural basin in Rio Blanco County, Colorado, and how they may relate to the development of underlying natural-gas reservoirs. Natural gas extraction in the area has been ongoing since at...
Authors
Peter McMahon, Judith Thomas, Andrew Hunt
Transport of nitrate in the Mississippi river in July-August 1999 Transport of nitrate in the Mississippi river in July-August 1999
Lagrangian sampling was conducted on the Mississippi River in late July through early August 1999 to test the hypothesis that nitrate (NO3-) is transported conservatively in the Mississippi River. Three different approaches were pursued to test the hypothesis: (1) a mass balance for NO3- was evaluated for evidence of net gains and losses, (2) stable isotopes of NO3- were measured (δ15N...
Authors
Richard Coupe, Donald Goolsby, William Battaglin, John Bohlke, Peter McMahon, Carol Kendall
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 118
The quality of our Nation's waters: Water quality in principal aquifers of the United States, 1991-2010 The quality of our Nation's waters: Water quality in principal aquifers of the United States, 1991-2010
About 130 million people in the United States rely on groundwater for drinking water, and the need for high-quality drinking-water supplies becomes more urgent as our population grows. Although groundwater is a safe, reliable source of drinking water for millions of people nationwide, high concentrations of some chemical constituents can pose potential human-health concerns. Some of...
Authors
Leslie A. DeSimone, Peter McMahon, Michael Rosen
Quality and age of shallow groundwater in the Bakken Formation production area, Williston Basin, Montana and North Dakota Quality and age of shallow groundwater in the Bakken Formation production area, Williston Basin, Montana and North Dakota
The quality and age of shallow groundwater in the Bakken Formation production area were characterized using data from 30 randomly distributed domestic wells screened in the upper Fort Union Formation. Comparison of inorganic and organic chemical concentrations to health based drinking-water standards, correlation analysis of concentrations with oil and gas well locations, and isotopic...
Authors
Peter McMahon, Rodney Caldwell, Joel Galloway, Joshua F. Valder, Andrew Hunt
Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado
Reliably identifying the effects of energy development on groundwater quality can be difficult because baseline assessments of water quality completed before the onset of energy development are rare and because interactions between hydrocarbon reservoirs and aquifers can be complex, involving both natural and human processes. Groundwater age and mixing data can strengthen interpretations...
Authors
Peter McMahon, Judith Thomas, Andrew Hunt
Chemistry and age of groundwater in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2010-12 Chemistry and age of groundwater in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2010-12
Fourteen monitoring wells completed in the Uinta and Green River Formations in the Piceance Creek and Yellow Creek watersheds in Rio Blanco County, Colorado, were sampled for chemical, isotopic, and groundwater-age tracers to provide information on the overall groundwater quality, the occurrence and distribution of chemicals that could be related to the development of underlying natural...
Authors
P.B. McMahon, J.C. Thomas, A.G. Hunt
Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12 Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12
Fourteen monitoring wells were sampled by the U.S. Geological Survey, in cooperation with the Bureau of Land Management, to better understand the chemistry and age of groundwater in the Piceance structural basin in Rio Blanco County, Colorado, and how they may relate to the development of underlying natural-gas reservoirs. Natural gas extraction in the area has been ongoing since at...
Authors
Peter McMahon, Judith Thomas, Andrew Hunt
Transport of nitrate in the Mississippi river in July-August 1999 Transport of nitrate in the Mississippi river in July-August 1999
Lagrangian sampling was conducted on the Mississippi River in late July through early August 1999 to test the hypothesis that nitrate (NO3-) is transported conservatively in the Mississippi River. Three different approaches were pursued to test the hypothesis: (1) a mass balance for NO3- was evaluated for evidence of net gains and losses, (2) stable isotopes of NO3- were measured (δ15N...
Authors
Richard Coupe, Donald Goolsby, William Battaglin, John Bohlke, Peter McMahon, Carol Kendall