Peter B McMahon (Former Employee)
Science and Products
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Filter Total Items: 118
Groundwater chemistry and water-level elevations in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2013–16 Groundwater chemistry and water-level elevations in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2013–16
The Piceance and Yellow Creek watersheds in Rio Blanco County, Colorado, are known to contain important energy resources (oil shale and natural gas) and mineral resources (nahcolite). The primary sources of fresh groundwater in the Piceance and Yellow Creek watersheds are bedrock aquifers in the Uinta and Green River Formations. The aquifers are divided into an upper and lower aquifer...
Authors
Judith Thomas, Peter McMahon
Regional patterns in the geochemistry of oil-field water, southern San Joaquin Valley, California, USA Regional patterns in the geochemistry of oil-field water, southern San Joaquin Valley, California, USA
Chemical and isotopic data for water co-extracted with hydrocarbons in oil and gas fields are commonly used to examine the source of the formation water and possible impacts on groundwater in areas of oil and gas development. Understanding the geochemical variability of oil-field water could help to evaluate its origin and delineate possible contamination of shallow aquifers in cases...
Authors
Peter McMahon, Justin Kulongoski, Avner Vengosh, Isabelle Cozzarelli, Matthew Landon, Yousif Kharaka, Janice M. Gillespie, Tracy Davis
Origin of methane and sources of high concentrations in Los Angeles groundwater Origin of methane and sources of high concentrations in Los Angeles groundwater
In 2014, samples from 37 monitoring wells at 17 locations, within or near oil fields, and one site >5 km from oil fields, in the Los Angeles Basin, California, were analyzed for dissolved hydrocarbon gas isotopes and abundances. The wells sample a variety of depths of an aquifer system composed of unconsolidated and semiconsolidated sediments under various conditions of confinement...
Authors
Justin Kulongoski, Peter McMahon, Michael Land, Michael Wright, Theodore Johnson, Matthew Landon
Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA
Site-specific and regional analysis of time-series hydrologic and geochemical data collected from 15 monitoring wells in the Piceance Basin indicated that a leaking gas well contaminated shallow groundwater with thermogenic methane. The gas well was drilled in 1956 and plugged and abandoned in 1990. Chemical and isotopic data showed the thermogenic methane was not from mixing of gas-rich...
Authors
Peter McMahon, Judith Thomas, John Crawford, Mark Dornblaser, Andrew Hunt
Methane in aquifers used for public supply in the United States Methane in aquifers used for public supply in the United States
In 2013 to 2015, 833 public supply wells in 15 Principal aquifers in the U.S. were sampled to identify which aquifers contained high methane concentrations (>1 mg/L) and determine the geologic, hydrologic, and geochemical conditions associated with high concentrations. This study represents the first national assessment of methane in aquifers used for public supply in the U.S. and, as...
Authors
Peter McMahon, Kenneth Belitz, Jeannie Barlow, Bryant Jurgens
Fraction of young water as an indicator of aquifer vulnerability along two regional flow paths in the Mississippi embayment aquifer system, southeastern USA Fraction of young water as an indicator of aquifer vulnerability along two regional flow paths in the Mississippi embayment aquifer system, southeastern USA
Wells along two regional flow paths were sampled to characterize changes in water quality and the vulnerability to contamination of the Memphis aquifer across a range of hydrologic and land-use conditions in the southeastern United States. The flow paths begin in the aquifer outcrop area and end at public supply wells in the confined parts of the aquifer at Memphis, Tennessee. Age-date...
Authors
James Kingsbury, Jeannie Barlow, Bryant Jurgens, Peter McMahon, John Carmichael
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 118
Groundwater chemistry and water-level elevations in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2013–16 Groundwater chemistry and water-level elevations in bedrock aquifers of the Piceance and Yellow Creek watersheds, Rio Blanco County, Colorado, 2013–16
The Piceance and Yellow Creek watersheds in Rio Blanco County, Colorado, are known to contain important energy resources (oil shale and natural gas) and mineral resources (nahcolite). The primary sources of fresh groundwater in the Piceance and Yellow Creek watersheds are bedrock aquifers in the Uinta and Green River Formations. The aquifers are divided into an upper and lower aquifer...
Authors
Judith Thomas, Peter McMahon
Regional patterns in the geochemistry of oil-field water, southern San Joaquin Valley, California, USA Regional patterns in the geochemistry of oil-field water, southern San Joaquin Valley, California, USA
Chemical and isotopic data for water co-extracted with hydrocarbons in oil and gas fields are commonly used to examine the source of the formation water and possible impacts on groundwater in areas of oil and gas development. Understanding the geochemical variability of oil-field water could help to evaluate its origin and delineate possible contamination of shallow aquifers in cases...
Authors
Peter McMahon, Justin Kulongoski, Avner Vengosh, Isabelle Cozzarelli, Matthew Landon, Yousif Kharaka, Janice M. Gillespie, Tracy Davis
Origin of methane and sources of high concentrations in Los Angeles groundwater Origin of methane and sources of high concentrations in Los Angeles groundwater
In 2014, samples from 37 monitoring wells at 17 locations, within or near oil fields, and one site >5 km from oil fields, in the Los Angeles Basin, California, were analyzed for dissolved hydrocarbon gas isotopes and abundances. The wells sample a variety of depths of an aquifer system composed of unconsolidated and semiconsolidated sediments under various conditions of confinement...
Authors
Justin Kulongoski, Peter McMahon, Michael Land, Michael Wright, Theodore Johnson, Matthew Landon
Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA Methane in groundwater from a leaking gas well, Piceance Basin, Colorado, USA
Site-specific and regional analysis of time-series hydrologic and geochemical data collected from 15 monitoring wells in the Piceance Basin indicated that a leaking gas well contaminated shallow groundwater with thermogenic methane. The gas well was drilled in 1956 and plugged and abandoned in 1990. Chemical and isotopic data showed the thermogenic methane was not from mixing of gas-rich...
Authors
Peter McMahon, Judith Thomas, John Crawford, Mark Dornblaser, Andrew Hunt
Methane in aquifers used for public supply in the United States Methane in aquifers used for public supply in the United States
In 2013 to 2015, 833 public supply wells in 15 Principal aquifers in the U.S. were sampled to identify which aquifers contained high methane concentrations (>1 mg/L) and determine the geologic, hydrologic, and geochemical conditions associated with high concentrations. This study represents the first national assessment of methane in aquifers used for public supply in the U.S. and, as...
Authors
Peter McMahon, Kenneth Belitz, Jeannie Barlow, Bryant Jurgens
Fraction of young water as an indicator of aquifer vulnerability along two regional flow paths in the Mississippi embayment aquifer system, southeastern USA Fraction of young water as an indicator of aquifer vulnerability along two regional flow paths in the Mississippi embayment aquifer system, southeastern USA
Wells along two regional flow paths were sampled to characterize changes in water quality and the vulnerability to contamination of the Memphis aquifer across a range of hydrologic and land-use conditions in the southeastern United States. The flow paths begin in the aquifer outcrop area and end at public supply wells in the confined parts of the aquifer at Memphis, Tennessee. Age-date...
Authors
James Kingsbury, Jeannie Barlow, Bryant Jurgens, Peter McMahon, John Carmichael