U.S. Geological Survey (USGS) scientist Dr. Diann J. Prosser examining a ruddy shelduck in China. Dr. Diann J. Prosser was awarded the Presidential Early Career Awards for Scientists and Engineers (PECASE).
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Dr. Diann J. Prosser Examining a Ruddy Shelduck
U.S. Geological Survey (USGS) scientist Dr. Diann J. Prosser examining a ruddy shelduck in China. Dr. Diann J. Prosser was awarded the Presidential Early Career Awards for Scientists and Engineers (PECASE).
Deposit of Iron-cemented Stream Gravel (Ferricrete)
Deposit of iron-cemented stream gravel (ferricrete) with embedded wood fragments that can be age dated using radiocarbon to determine the age of the ferricrete deposit. Knowing the age of the ferricretes helps scientists determine if the associated enrichment of metals in streams occurred before or after mining in the watershed started.
Deposit of iron-cemented stream gravel (ferricrete) with embedded wood fragments that can be age dated using radiocarbon to determine the age of the ferricrete deposit. Knowing the age of the ferricretes helps scientists determine if the associated enrichment of metals in streams occurred before or after mining in the watershed started.
Mineral Creek Watershed in Southwestern Colorado
Mineral Creek watershed in southwestern Colorado has natural and mining-related sources of contamination. In the background of this photo is a large naturally occurring seep that discharges acidic, metal-rich water to a tributary of Mineral Creek.
Mineral Creek watershed in southwestern Colorado has natural and mining-related sources of contamination. In the background of this photo is a large naturally occurring seep that discharges acidic, metal-rich water to a tributary of Mineral Creek.
Scientists collecting samples of runoff from a test plot
Scientists collecting samples of runoff from a test plot during a simulated rainfall event. The field received an application of biosolids, and the runoff samples were analyzed for organic chemicals that are commonly used in our everyday lives.
Scientists collecting samples of runoff from a test plot during a simulated rainfall event. The field received an application of biosolids, and the runoff samples were analyzed for organic chemicals that are commonly used in our everyday lives.
Sampling House Dust For PAH Analysis
A USGS researcher uses an ASTM-approved vacuum to collect house dust for analysis.
A USGS researcher uses an ASTM-approved vacuum to collect house dust for analysis.
Dr. David S. Blehert working in a laboratory
Dr. David S. Blehert working in a laboratory
Dr. David S. Blehert working in a laboratory
USGS Scientist Takes a Sample from a Northern Pintail Duck
USGS scientist takes a sample from a northern pintail duck (Anas acuta) to be tested for avian influenza.
USGS scientist takes a sample from a northern pintail duck (Anas acuta) to be tested for avian influenza.
Early life stage white sturgeon
Early life stage white sturgeon swimming in a laboratory tank.
Early life stage white sturgeon swimming in a laboratory tank.
A USGS scientist prepares a tracer solution in a gas-tight bladder
A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into a zone of nitrate-containing groundwater to monitor the production and consumption of nitric oxide dissolved in groundwater.
A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into a zone of nitrate-containing groundwater to monitor the production and consumption of nitric oxide dissolved in groundwater.
Single-well tracer test
Single-well tracer tests involve injecting a tracer solution into one port of a multilevel sampling well, creating a tracer cloud in the groundwater, and then monitoring the water chemistry in the tracer cloud from the same well as the tracer cloud moves away from the well.
Single-well tracer tests involve injecting a tracer solution into one port of a multilevel sampling well, creating a tracer cloud in the groundwater, and then monitoring the water chemistry in the tracer cloud from the same well as the tracer cloud moves away from the well.
Taking surface sediment measurements at Crissy Marsh in San Francisco, CA.
USGS researcher Jennifer Agee taking surface sediment oxidation-reduction and pH measurements at Crissy Marsh, a vegetated saltmarsh near the Golden Gate Bridge (background) in San Francisco, CA. Photographer: L. Windham-Myers.
USGS researcher Jennifer Agee taking surface sediment oxidation-reduction and pH measurements at Crissy Marsh, a vegetated saltmarsh near the Golden Gate Bridge (background) in San Francisco, CA. Photographer: L. Windham-Myers.
Rhizosphere (root zone) of a wetland plant
USGS employee showing the rhizosphere (root zone) of a wetland plant, which is a critical zone for microbiological and biogeochemical processes.
USGS employee showing the rhizosphere (root zone) of a wetland plant, which is a critical zone for microbiological and biogeochemical processes.
Sampling Dust From Sealcoated Pavement
USGS researchers collect samples of dust from a sealcoated parking lot for analysis of polycyclic aromatic hydrocarbons (PAHs). PAH concentrations in dust swept from coal-tar-sealcoated parking lots are 100s to 1000s of times higher than those swept from parking lots with other types of surfaces.
USGS researchers collect samples of dust from a sealcoated parking lot for analysis of polycyclic aromatic hydrocarbons (PAHs). PAH concentrations in dust swept from coal-tar-sealcoated parking lots are 100s to 1000s of times higher than those swept from parking lots with other types of surfaces.
Studies of contaminant biogeochemistry and microbial processes in wetland environments.
Left Image: Managed wetland at the Yolo Bypass Wildlife Preserve (California Central Valley) showing mixed flocks of foraging birds. Photographer: M. Marvin-DiPasquale.
Left Image: Managed wetland at the Yolo Bypass Wildlife Preserve (California Central Valley) showing mixed flocks of foraging birds. Photographer: M. Marvin-DiPasquale.
Sealcoated Driveway With Basketball Hoop
A driveway in an upscale residential community in the Lake in the Hills, Ill, is coated with coal-tar-based sealcoat. The driveway has a basketball hoop and a skateboard ramp.
A driveway in an upscale residential community in the Lake in the Hills, Ill, is coated with coal-tar-based sealcoat. The driveway has a basketball hoop and a skateboard ramp.
Residential Driveways With Coal-Tar-Based Sealcoat
Driveways in an upscale residential subdivision in Lake in the Hills, Ill., are coated with black coal-tar-based sealcoat, contrasting with the white cement sidewalk.
Driveways in an upscale residential subdivision in Lake in the Hills, Ill., are coated with black coal-tar-based sealcoat, contrasting with the white cement sidewalk.
Parking Lot With Coal-Tar-Based Sealcoat
Sealcoat particles abraded from a parking lot with coal-tar-based sealcoat collect by the curbside. Also shown is a storm drain, half coated with sealcoat, down which the loose particles will be washed by runoff.
Sealcoat particles abraded from a parking lot with coal-tar-based sealcoat collect by the curbside. Also shown is a storm drain, half coated with sealcoat, down which the loose particles will be washed by runoff.
Three test tubes with filter paper inside
Photograph of iron(III) oxyhydroxides (yellow-brown color in two left-hand tubes collected on folded filter paper) that was produced in iron(II)-containing groundwater by the addition of nitrate. The tube on the right is a filter collected from the same groundwater before nitrate was added.
Photograph of iron(III) oxyhydroxides (yellow-brown color in two left-hand tubes collected on folded filter paper) that was produced in iron(II)-containing groundwater by the addition of nitrate. The tube on the right is a filter collected from the same groundwater before nitrate was added.
Scientists Collecting Bed-Sediment Samples from Suwanee Creek, Georgia
U.S. Geological Survey (USGS) scientists collecting bed-sediment samples from Suwanee Creek, Gwinnett County, Georgia, on May 23, 2007.
U.S. Geological Survey (USGS) scientists collecting bed-sediment samples from Suwanee Creek, Gwinnett County, Georgia, on May 23, 2007.
Soil Sampling in Eastern Colorado
Soil sampling in Eastern Colorado indicated that some chemicals introduced to nonirrigated farmland through biosolids application persisted through 468 days, and some chemicals were sufficiently mobile to be detected in soil as deep as 126 centimeters below land surface.
Soil sampling in Eastern Colorado indicated that some chemicals introduced to nonirrigated farmland through biosolids application persisted through 468 days, and some chemicals were sufficiently mobile to be detected in soil as deep as 126 centimeters below land surface.
Studies of contaminant biogeochemistry and microbial processes in surface sediments.
Left: USGS Employee Sherry Wren removing a square meter of surface sediment in pickleweed dominated marsh along the Petaluma River (California), for a study designed to investigate the role of marsh plant root zone on the cycling of mercury. Photographer: L. Windham-Myers. Date: 4/4/2006
Left: USGS Employee Sherry Wren removing a square meter of surface sediment in pickleweed dominated marsh along the Petaluma River (California), for a study designed to investigate the role of marsh plant root zone on the cycling of mercury. Photographer: L. Windham-Myers. Date: 4/4/2006