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A core sample was collected from the uppermost saturated portion of the sandy aquifer using the "freezing drive shoe" technology developed by USGS scientists at the National Crude Oil Spill Fate and Natural Attenuation Research Site.
A core sample was collected from the uppermost saturated portion of the sandy aquifer using the "freezing drive shoe" technology developed by USGS scientists at the National Crude Oil Spill Fate and Natural Attenuation Research Site.
Dr. Isabelle M. Cozzarellli (far right) and her colleagues pause for a photograph at the National Crude Oil Spill Fate and Natural Attenuation Research Site, Bemidji, Minnesota. They are holding a core sample collected with "freezing drive shoe" technology developed by U.S.
Dr. Isabelle M. Cozzarellli (far right) and her colleagues pause for a photograph at the National Crude Oil Spill Fate and Natural Attenuation Research Site, Bemidji, Minnesota. They are holding a core sample collected with "freezing drive shoe" technology developed by U.S.
A scientist completes anaerobic processing of sediment from selected core depths prior to geochemical analyses.
A scientist completes anaerobic processing of sediment from selected core depths prior to geochemical analyses.
To help understand the geochemical conditions that control arsenic mobilization in the subsurface a USGS scientist uses a syringe to withdraw water from a core for analysis.
To help understand the geochemical conditions that control arsenic mobilization in the subsurface a USGS scientist uses a syringe to withdraw water from a core for analysis.
To help understand the geochemical conditions that control arsenic mobilization in the subsurface a U.S. Geological Survey scientist uses a syringe to withdraw water from a core for analysis.
To help understand the geochemical conditions that control arsenic mobilization in the subsurface a U.S. Geological Survey scientist uses a syringe to withdraw water from a core for analysis.
Tundra swans that nest in Alaska are exposed to lead on their wintering grounds along the Atlantic Coast.
Tundra swans that nest in Alaska are exposed to lead on their wintering grounds along the Atlantic Coast.
U.S. Geological Survey (USGS) scientists collecting soil samples on the Canyon Mine property, Arizona. The mine's headframe and mine workshop are visible in the background.
U.S. Geological Survey (USGS) scientists collecting soil samples on the Canyon Mine property, Arizona. The mine's headframe and mine workshop are visible in the background.
USGS scientists collecting soil samples at Canyon Mine.
USGS scientists collecting soil samples at Canyon Mine.
Wetlands in an arid western landscape.
Wetlands in an arid western landscape.
Chesapeake Bay watershed, outlined in blue. Modified from USGS poster.The Chesapeake Bay Watershed.
Chesapeake Bay watershed, outlined in blue. Modified from USGS poster.The Chesapeake Bay Watershed.
USGS and USFS scientists installing dust collectors at the Pinyon Plain uranium mine. Photo: Mike Duniway. 4/9/2013.
USGS and USFS scientists installing dust collectors at the Pinyon Plain uranium mine. Photo: Mike Duniway. 4/9/2013.
Spigot sticking out of a pipe in a drinking-water treatment plant
Spigot sticking out of a pipe in a drinking-water treatment plant
Wellhead inside of a drinking-water plant
A USGS scientist collecting a water-quality sample from Boulder Creek, Colorado.
A USGS scientist collecting a water-quality sample from Boulder Creek, Colorado.
Left: USGS Employee L. Windham-Myers showing a surface water sample collected in acid-cleaned mason jar (deployed for 24 hours) for a mercury study conducted at the Cosumnes River Nature Preserve (CA). Photographer: M. Marvin-DiPasquale. Date: 10/29/2014.
Left: USGS Employee L. Windham-Myers showing a surface water sample collected in acid-cleaned mason jar (deployed for 24 hours) for a mercury study conducted at the Cosumnes River Nature Preserve (CA). Photographer: M. Marvin-DiPasquale. Date: 10/29/2014.
An Appalachian Mountain Stream in the Spring. Photographed by Samuel H Austin
An Appalachian Mountain Stream in the Spring. Photographed by Samuel H Austin
Flower in Big Meadows, Virginia.
A U.S. Geological Survey analyst performs DNA extractions on enriched cultures of water from the study area. Once the DNA was extracted it was used to detect pathogen gene markers using polymerase chain reaction (PCR).
A U.S. Geological Survey analyst performs DNA extractions on enriched cultures of water from the study area. Once the DNA was extracted it was used to detect pathogen gene markers using polymerase chain reaction (PCR).
USGS Scientist collecting a water-quality sample from the South Fork Zumbro River, MN
USGS Scientist collecting a water-quality sample from the South Fork Zumbro River, MN
USGS scientists recording information on water-quality samples and field water-quality parameters
USGS scientists recording information on water-quality samples and field water-quality parameters
Microbial-Contaminant Interactions Laboratory — Boulder, Colorado. Bacteria contained in filter chambers placed in downgradient observation wells were exposed to sulfamethoxazole for 30 days as it traveled past the wells.
Microbial-Contaminant Interactions Laboratory — Boulder, Colorado. Bacteria contained in filter chambers placed in downgradient observation wells were exposed to sulfamethoxazole for 30 days as it traveled past the wells.