Paul M Bradley
Introduction: Research Hydrologist/Ecologist with the South Atlantic Water Science Center focused on understanding environmental contaminant mixture exposures and real versus perceived effects to human and environmental health.
Paul is project lead, along with Kelly Smalling, of the Drinking-Water and Wastewater Infrastructure Integrated Science Team of the Ecosystems Mission, Environmental Health Program. His research focuses on human exposures to and potential effects of inorganic, organic, and microbial contaminant mixtures in drinking water at the point of use and on anthropogenic contaminant mixtures as ecosystem stressors.
Professional Experience
1988–present: Research Ecologist/Hydrologist, U.S. Geological Survey
Expertise:
• Contaminant mixtures
• Drinking water
• Water quality
• Environmental health
Education and Certifications
B.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
M.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
Ph.D., Physiological Ecology, University of South Carolina, Columbia, South Carolina
Science and Products
Optimizing fish sampling for fish - mercury bioaccumulation factors
Design and methods of the Southeast Stream Quality Assessment (SESQA), 2014
Chemical mixtures and environmental effects: a pilot study to assess ecological exposure and effects in streams
Scaling up watershed model parameters--Flow and load simulations of the Edisto River Basin
An empirical approach to modeling methylmercury concentrations in an Adirondack stream watershed
Riverbank filtration potential of pharmaceuticals in a wastewater-impacted stream
Scaling up watershed model parameters: flow and load simulations of the Edisto River Basin, South Carolina, 2007-09
Effect of light on biodegradation of Estrone, 17β-estradiol, and 17α-ethinylestradiol in stream sediment
Assessment of endocrine-disrupting chemicals attenuation in a coastal plain stream prior to wastewater treatment plant closure
Mercury in the soil of two contrasting watersheds in the eastern United States
Mercury and methylmercury stream concentrations in a Coastal Plain watershed: A multi-scale simulation analysis
Organic wastewater compounds in water and sediment in and near restored wetlands, Great Marsh, Indiana Dunes National Lakeshore, 2009–11
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Optimizing fish sampling for fish - mercury bioaccumulation factors
Fish Bioaccumulation Factors (BAFs; ratios of mercury (Hg) in fish (Hgfish) and water (Hgwater)) are used to develop Total Maximum Daily Load and water quality criteria for Hg-impaired waters. Both applications require representative Hgfish estimates and, thus, are sensitive to sampling and data-treatment methods. Data collected by fixed protocol from 11 streams in 5 states distributed across theAuthorsBarbara C. Scudder Eikenberry, Karen Riva-Murray, Christopher D. Knightes, Celeste A. Journey, Lia C. Chasar, Mark E. Brigham, Paul M. BradleyDesign and methods of the Southeast Stream Quality Assessment (SESQA), 2014
During 2014, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) assessed stream quality across the Piedmont and southern Appalachian Mountain regions of the southeastern United States. This Southeast Stream Quality Assessment (SESQA) simultaneously characterized watershed and stream-reach water-quality stressors along with instream biological conditions, in order tAuthorsCeleste A. Journey, Peter C. Van Metre, Amanda H. Bell, Jessica D. Garrett, Daniel T. Button, Naomi Nakagaki, Sharon L. Qi, Paul M. BradleyChemical mixtures and environmental effects: a pilot study to assess ecological exposure and effects in streams
Assessment and management of the risks of exposure to complex chemical mixtures in streams are priorities for human and environmental health organizations around the world. The current lack of information on the composition and variability of environmental mixtures and a limited understanding of their combined effects are fundamental obstacles to timely identification and prevention of adverse humAuthorsHerbert T. Buxton, Timothy J. Reilly, Kathryn Kuivila, Dana W. Kolpin, Paul M. Bradley, Daniel L. Villeneuve, Marc A. MillsScaling up watershed model parameters--Flow and load simulations of the Edisto River Basin
The Edisto River is the longest and largest river system completely contained in South Carolina and is one of the longest free flowing blackwater rivers in the United States. The Edisto River basin also has fish-tissue mercury concentrations that are some of the highest recorded in the United States. As part of an effort by the U.S. Geological Survey to expand the understanding of relations amongAuthorsToby D. Feaster, Stephen T. Benedict, Jimmy M. Clark, Paul M. Bradley, Paul ConradsAn empirical approach to modeling methylmercury concentrations in an Adirondack stream watershed
Inverse empirical models can inform and improve more complex process-based models by quantifying the principal factors that control water quality variation. Here we developed a multiple regression model that explains 81% of the variation in filtered methylmercury (FMeHg) concentrations in Fishing Brook, a fourth-order stream in the Adirondack Mountains, New York, a known “hot spot” of Hg bioaccumuAuthorsDouglas A. Burns, Elizabeth A. Nystrom, David M. Wolock, Paul M. Bradley, Karen Riva-MurrayRiverbank filtration potential of pharmaceuticals in a wastewater-impacted stream
Pharmaceutical contamination of shallow groundwater is a substantial concern in effluent-dominated streams, due to high aqueous mobility, designed bioactivity, and effluent-driven hydraulic gradients. In October and December 2012, effluent contributed approximately 99% and 71%, respectively, to downstream flow in Fourmile Creek, Iowa, USA. Strong hydrologic connectivity was observed between surfacAuthorsPaul M. Bradley, Larry B. Barber, Joseph W. Duris, William T. Foreman, Edward T. Furlong, Laura E. Hubbard, Kasey J. Hutchinson, Steffanie H. Keefe, Dana W. KolpinScaling up watershed model parameters: flow and load simulations of the Edisto River Basin, South Carolina, 2007-09
As part of an ongoing effort by the U.S. Geological Survey to expand the understanding of relations among hydrologic, geochemical, and ecological processes that affect fish-tissue mercury concentrations within the Edisto River Basin, analyses and simulations of the hydrology of the Edisto River Basin were made using the topography-based hydrological model (TOPMODEL). A primary focus of the investiAuthorsToby D. Feaster, Stephen T. Benedict, Jimmy M. Clark, Paul M. Bradley, Paul ConradsEffect of light on biodegradation of Estrone, 17β-estradiol, and 17α-ethinylestradiol in stream sediment
Biodegradation of [A-ring 14C] Estrone (E1), 17β-estradiol (E2), and 17α-ethinylestradiol (EE2) to 14CO2 was investigated under light and dark conditions in microcosms containing epilithon or sediment collected from Boulder Creek, Colorado. Mineralization of the estrogen A-ring was observed in all sediment treatments, but not epilithon treatments. No difference in net mineralization between lightAuthorsPaul M. Bradley, Jeffrey H. WriterAssessment of endocrine-disrupting chemicals attenuation in a coastal plain stream prior to wastewater treatment plant closure
The U.S. Geological Survey is conducting a combined pre/post-closure assessment at a long-term wastewater treatment plant (WWTP) site at Fort Gordon near Augusta, Georgia. Here, we assess select endocrine-active chemicals and benthic macroinvertebrate community structure prior to closure of the WWTP. Substantial downstream transport and limited instream attenuation of endocrine-disrupting chemicalAuthorsPaul M. Bradley, Celeste A. JourneyMercury in the soil of two contrasting watersheds in the eastern United States
Soil represents the largest store of mercury (Hg) in terrestrial ecosystems, and further study of the factors associated with soil Hg storage is needed to address concerns about the magnitude and persistence of global environmental Hg bioaccumulation. To address this need, we compared total Hg and methyl Hg concentrations and stores in the soil of different landscapes in two watersheds in differenAuthorsDouglas A. Burns, Laurel G. Woodruff, Paul M. Bradley, William F. CannonMercury and methylmercury stream concentrations in a Coastal Plain watershed: A multi-scale simulation analysis
Mercury is a ubiquitous global environmental toxicant responsible for most US fish advisories. Processes governing mercury concentrations in rivers and streams are not well understood, particularly at multiple spatial scales. We investigate how insights gained from reach-scale mercury data and model simulations can be applied at broader watershed scales using a spatially and temporally explicit waAuthorsChristopher D. Knightes, Heather E. Golden, Celeste A. Journey, Gary M. Davis, Paul Conrads, Mark Marvin-DiPasquale, Mark E. Brigham, Paul M. BradleyOrganic wastewater compounds in water and sediment in and near restored wetlands, Great Marsh, Indiana Dunes National Lakeshore, 2009–11
A cooperative investigation between the U.S. Geological Survey and the National Park Service was completed from 2009 through 2011 to understand the occurrence, distribution, and environmental processes affecting concentrations of organic wastewater compounds in water and sediment in and near Great Marsh at the Indiana Dunes National Lakeshore in Beverly Shores, Indiana. Sampling sites were selecteAuthorsAmanda L. Egler, Martin R. Risch, David A. Alvarez, Paul M. Bradley - Web Tools
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