Christopher Kephart
Hydrologist, Ohio-Kentucky-Indiana Water Science Center
Science and Products
Filter Total Items: 23
Assessment of water quality and fecal contamination sources at Hook Pond, East Hampton, New York
SummaryThe U.S. Geological Survey, in cooperation with the Village of East Hampton, New York, conducted a 1-year study from August 2017 to August 2018 to provide data necessary to improve understanding of the sources of nutrients and pathogens to Hook Pond watershed to allow for possible mitigation or reduction of loads. Chronic eutrophication and recent concern over harmful cyanobacteria in Hook
Authors
Shawn C. Fisher, Brendan A. McCarthy, Christopher M. Kephart, Dale W. Griffin
Spatial and temporal distribution of bacterial indicators and microbial-source tracking within Tumacácori National Historical Park and the upper Santa Cruz River, southern Arizona and northern Mexico, 2015–2016
Tumacácori National Historical Park (TUMA) in southern Arizona protects the culturally important Mission San José de Tumacácori, while also managing a part of the ecologically diverse riparian corridor of the Santa Cruz River. The quality of the water flowing through depends solely on upstream watershed activities, and among the water-quality issues concerning TUMA is the microbiological pathogens
Authors
Nicholas V. Paretti, Christopher M. Kephart, Thomas J. Porter, Edyth Hermosillo, Jay R. Cederberg, Justine P. Mayo, Bruce Gungle, Alissa L. Coes, Rachel S. Tucci, Laura M. Norman
Escherichia coli and microbial source tracking marker concentrations in and near a constructed wetland in Maumee Bay State Park, Oregon, Ohio, 2015–16
Elevated Escherichia coli (E. coli) concentrations at the Maumee Bay State Park (MBSP) Lake Erie beach have resulted in frequent recreational water-quality advisories. After the construction of a wetland along Berger Ditch in Maumee Bay State Park, Oregon, Ohio, samples were collected and analyzed for concentrations of E. coli and microbial source tracking (MST) markers. This study was done by the
Authors
Christopher M. Kephart, Amie M.G. Brady, Ryan W. Jackwood
Collection methods and quality assessment for Escherichia coli, water quality, and microbial source tracking data within Tumacácori National Historical Park and the upper Santa Cruz River, Arizona, 2015-16
Tumacácori National Historical Park protects the culturally important Mission, San José de Tumacácori, while also managing a portion of the ecologically diverse riparian corridor of the Santa Cruz River. This report describes the methods and quality assurance procedures used in the collection of water samples for the analysis of Escherichia coli (E. coli), microbial source tracking markers, suspen
Authors
Nicholas V. Paretti, Alissa L. Coes, Christopher M. Kephart, Justine P. Mayo
Comparing rapid and culture indicator bacteria methods at inland lake beaches
A rapid method, quantitative polymerase chain reaction (qPCR), for quantifying indicator bacteria in recreational waters is desirable for public health protection. We report that replacing current Escherichia coli standards with new US Environmental Protection Agency beach action values (BAVs) for enterococci by culture or qPCR may result in more advisories being posted at inland recreational lake
Authors
Donna S. Francy, Rebecca N. Bushon, Amie M. G. Brady, Christopher M. Kephart
Results of an evaluation of the effectiveness of chlorine dioxide as a disinfectant for onsite household sewage treatment systems
No abstract available.
Authors
Christopher M. Kephart, Donald M. Stoeckel
Utility of Microbial Source-Tracking Markers for Assessing Fecal Contamination in the Portage River Watershed, Northwestern Ohio, 2008
An influx of concentrated animal feeding operations in northwest Ohio has prompted local agencies to examine the effects of these industrial farms on water quality in the upper Portage River watershed. The utility of microbial source-tracking (MST) tools as a means of characterizing sources of fecal contamination in the watershed was evaluated. From 2007 to 2008, scientists with the U.S. Geologica
Authors
Christopher M. Kephart, Rebecca N. Bushon
Evaluation of Real-Time Quantitative Polymerase Chain Reaction (qPCR) to Determine Escherichia coli Concentrations at Two Lake Erie Beaches
During the recreational seasons of 2006 and 2007, the quantitative polymerase chain reaction (qPCR) method was used to determine Escherichia coli (E. coli) concentrations in samples from two Lake Erie beaches. Results from the qPCR method were compared to those obtained by traditional culturing on modified mTEC agar. Regression analysis showed strong, statistically significant correlations between
Authors
Christopher M. Kephart, Rebecca N. Bushon
Performance of Traditional and Molecular Methods for Detecting Biological Agents in Drinking Water
To reduce the impact from a possible bioterrorist attack on drinking-water supplies, analytical methods are needed to rapidly detect the presence of biological agents in water. To this end, 13 drinking-water samples were collected at 9 water-treatment plants in Ohio to assess the performance of a molecular method in comparison to traditional analytical methods that take longer to perform. Two 100-
Authors
Donna S. Francy, Rebecca N. Bushon, Amie M. G. Brady, Erin E. Bertke, Christopher M. Kephart, Christina A. Likirdopulos, Brian E. Mailot, Frank W. Schaefer, H.D. Alan Lindquist
Use of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches
Source-tracking tools were used to identify potential sources of fecal contamination at two Lake Erie bathing beaches: an urban beach (Edgewater in Cleveland, Ohio) and a beach in a small city (Lakeshore in Ashtabula, Ohio). These tools included identifying spatial patterns of Escherichia coli (E. coli) concentrations in each area, determining weather patterns that caused elevated E. coli, and app
Authors
Donna S. Francy, Erin E. Bertke, Dennis P. Finnegan, Christopher M. Kephart, Rodney A. Sheets, John Rhoades, Lester Stumpe
Bacteriological water quality in the Lake Pontchartrain basin, Louisiana, following Hurricanes Katrina and Rita, September 2005
The U.S. Geological Survey (USGS), in collaboration with the Louisiana Department of Environmental Quality, monitored bacteriological quality of water at 22 sites in and around Lake Pontchartrain, La., for three consecutive weeks beginning September 13, 2005, following hurricanes Katrina and Rita and the associated flooding. Samples were collected and analyzed by USGS personnel from the USGS Louis
Authors
Donald M. Stoeckel, Rebecca N. Bushon, Dennis K. Demcheck, Stanley C. Skrobialowski, Christopher M. Kephart, Erin E. Bertke, Brian E. Mailot, Scott V. Mize, Robert B. Fendick
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Filter Total Items: 23
Assessment of water quality and fecal contamination sources at Hook Pond, East Hampton, New York
SummaryThe U.S. Geological Survey, in cooperation with the Village of East Hampton, New York, conducted a 1-year study from August 2017 to August 2018 to provide data necessary to improve understanding of the sources of nutrients and pathogens to Hook Pond watershed to allow for possible mitigation or reduction of loads. Chronic eutrophication and recent concern over harmful cyanobacteria in Hook
AuthorsShawn C. Fisher, Brendan A. McCarthy, Christopher M. Kephart, Dale W. GriffinSpatial and temporal distribution of bacterial indicators and microbial-source tracking within Tumacácori National Historical Park and the upper Santa Cruz River, southern Arizona and northern Mexico, 2015–2016
Tumacácori National Historical Park (TUMA) in southern Arizona protects the culturally important Mission San José de Tumacácori, while also managing a part of the ecologically diverse riparian corridor of the Santa Cruz River. The quality of the water flowing through depends solely on upstream watershed activities, and among the water-quality issues concerning TUMA is the microbiological pathogens
AuthorsNicholas V. Paretti, Christopher M. Kephart, Thomas J. Porter, Edyth Hermosillo, Jay R. Cederberg, Justine P. Mayo, Bruce Gungle, Alissa L. Coes, Rachel S. Tucci, Laura M. NormanEscherichia coli and microbial source tracking marker concentrations in and near a constructed wetland in Maumee Bay State Park, Oregon, Ohio, 2015–16
Elevated Escherichia coli (E. coli) concentrations at the Maumee Bay State Park (MBSP) Lake Erie beach have resulted in frequent recreational water-quality advisories. After the construction of a wetland along Berger Ditch in Maumee Bay State Park, Oregon, Ohio, samples were collected and analyzed for concentrations of E. coli and microbial source tracking (MST) markers. This study was done by theAuthorsChristopher M. Kephart, Amie M.G. Brady, Ryan W. JackwoodCollection methods and quality assessment for Escherichia coli, water quality, and microbial source tracking data within Tumacácori National Historical Park and the upper Santa Cruz River, Arizona, 2015-16
Tumacácori National Historical Park protects the culturally important Mission, San José de Tumacácori, while also managing a portion of the ecologically diverse riparian corridor of the Santa Cruz River. This report describes the methods and quality assurance procedures used in the collection of water samples for the analysis of Escherichia coli (E. coli), microbial source tracking markers, suspenAuthorsNicholas V. Paretti, Alissa L. Coes, Christopher M. Kephart, Justine P. MayoComparing rapid and culture indicator bacteria methods at inland lake beaches
A rapid method, quantitative polymerase chain reaction (qPCR), for quantifying indicator bacteria in recreational waters is desirable for public health protection. We report that replacing current Escherichia coli standards with new US Environmental Protection Agency beach action values (BAVs) for enterococci by culture or qPCR may result in more advisories being posted at inland recreational lakeAuthorsDonna S. Francy, Rebecca N. Bushon, Amie M. G. Brady, Christopher M. KephartResults of an evaluation of the effectiveness of chlorine dioxide as a disinfectant for onsite household sewage treatment systems
No abstract available.AuthorsChristopher M. Kephart, Donald M. StoeckelUtility of Microbial Source-Tracking Markers for Assessing Fecal Contamination in the Portage River Watershed, Northwestern Ohio, 2008
An influx of concentrated animal feeding operations in northwest Ohio has prompted local agencies to examine the effects of these industrial farms on water quality in the upper Portage River watershed. The utility of microbial source-tracking (MST) tools as a means of characterizing sources of fecal contamination in the watershed was evaluated. From 2007 to 2008, scientists with the U.S. GeologicaAuthorsChristopher M. Kephart, Rebecca N. BushonEvaluation of Real-Time Quantitative Polymerase Chain Reaction (qPCR) to Determine Escherichia coli Concentrations at Two Lake Erie Beaches
During the recreational seasons of 2006 and 2007, the quantitative polymerase chain reaction (qPCR) method was used to determine Escherichia coli (E. coli) concentrations in samples from two Lake Erie beaches. Results from the qPCR method were compared to those obtained by traditional culturing on modified mTEC agar. Regression analysis showed strong, statistically significant correlations betweenAuthorsChristopher M. Kephart, Rebecca N. BushonPerformance of Traditional and Molecular Methods for Detecting Biological Agents in Drinking Water
To reduce the impact from a possible bioterrorist attack on drinking-water supplies, analytical methods are needed to rapidly detect the presence of biological agents in water. To this end, 13 drinking-water samples were collected at 9 water-treatment plants in Ohio to assess the performance of a molecular method in comparison to traditional analytical methods that take longer to perform. Two 100-AuthorsDonna S. Francy, Rebecca N. Bushon, Amie M. G. Brady, Erin E. Bertke, Christopher M. Kephart, Christina A. Likirdopulos, Brian E. Mailot, Frank W. Schaefer, H.D. Alan LindquistUse of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches
Source-tracking tools were used to identify potential sources of fecal contamination at two Lake Erie bathing beaches: an urban beach (Edgewater in Cleveland, Ohio) and a beach in a small city (Lakeshore in Ashtabula, Ohio). These tools included identifying spatial patterns of Escherichia coli (E. coli) concentrations in each area, determining weather patterns that caused elevated E. coli, and appAuthorsDonna S. Francy, Erin E. Bertke, Dennis P. Finnegan, Christopher M. Kephart, Rodney A. Sheets, John Rhoades, Lester StumpeBacteriological water quality in the Lake Pontchartrain basin, Louisiana, following Hurricanes Katrina and Rita, September 2005
The U.S. Geological Survey (USGS), in collaboration with the Louisiana Department of Environmental Quality, monitored bacteriological quality of water at 22 sites in and around Lake Pontchartrain, La., for three consecutive weeks beginning September 13, 2005, following hurricanes Katrina and Rita and the associated flooding. Samples were collected and analyzed by USGS personnel from the USGS LouisAuthorsDonald M. Stoeckel, Rebecca N. Bushon, Dennis K. Demcheck, Stanley C. Skrobialowski, Christopher M. Kephart, Erin E. Bertke, Brian E. Mailot, Scott V. Mize, Robert B. Fendick