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Robert Anders

Robert Anders is a Research Hydrologist at the California Water Science Center.

Science and Products

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Standing on the shore line of a pond

Processes Controlling Riverbank Filtration of Pathogens in the Russian River Basin, Sonoma County, California

The Sonoma County Water Agency (SCWA) supplies drinking water to municipalities and water districts in Sonoma and Marin Counties by diverting water from the alluvial aquifer underlying and adjacent to the Russian River. The U.S. Geological Survey, in cooperation with SCWA, is conducting an ongoing research program on water quality conditions in the Russian River and the physical and geochemical...
By
California Water Science Center
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Processes Controlling Riverbank Filtration of Pathogens in the Russian River Basin, Sonoma County, California

The Sonoma County Water Agency (SCWA) supplies drinking water to municipalities and water districts in Sonoma and Marin Counties by diverting water from the alluvial aquifer underlying and adjacent to the Russian River. The U.S. Geological Survey, in cooperation with SCWA, is conducting an ongoing research program on water quality conditions in the Russian River and the physical and geochemical...
Learn More
link
Looking at a bridge over a river

Enterococcus Surface Protein as an Indicator of Human Fecal Pollution in the Lower Russian River Basin

Preliminary evaluation of water-quality data collected in the Lower Russian River Basin, Sonoma County, California during an on-going program by the U.S. Geological Survey (USGS), in cooperation with Sonoma County Water Agency (SCWA), indicated that there is considerable variability in bacterial concentrations from reach to reach and from year to year. Furthermore, tributaries that maintained...
By
California Water Science Center
link

Enterococcus Surface Protein as an Indicator of Human Fecal Pollution in the Lower Russian River Basin

Preliminary evaluation of water-quality data collected in the Lower Russian River Basin, Sonoma County, California during an on-going program by the U.S. Geological Survey (USGS), in cooperation with Sonoma County Water Agency (SCWA), indicated that there is considerable variability in bacterial concentrations from reach to reach and from year to year. Furthermore, tributaries that maintained...
Learn More

Water chemistry data for samples collected at groundwater sites in the Santa Maria Valley Oil Field study area, July 2018–March 2019, Santa Barbara County, California

The California State Water Resources Control Board (State Water Board) initiated the Oil and Gas Regional Monitoring Program (RMP) to assess effects of oil and gas development on groundwater designated for any beneficial use. The U.S. Geological Survey (USGS) is the technical lead in conducting the RMP through the California Oil, Gas, and Groundwater (COGG) Program, working in cooperation with the
By
California Water Science Center

Groundwater quality near the Placerita Oil Field, California, 2018

Groundwater-quality data and potential fluid-migration pathways near the Placerita Oil Field in Los Angeles County, California, were examined by the U.S. Geological Survey to determine if oil-field fluids (water and gas from oil-producing and non-producing zones) have mixed with groundwater resources. Six of the 13 new groundwater samples collected for this study contained petroleum hydrocarbons,
Authors
Jennifer S. Stanton, Matthew K. Landon, David H. Shimabukuro, Justin T. Kulongoski, Andrew G. Hunt, Peter B. McMahon, Isabelle M. Cozzarelli, Robert Anders, Theron A. Sowers
By
Water Resources Mission Area, California Water Science Center, New England Water Science Center

Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He

Relative risks of groundwater-quality degradation near selected California oil fields are estimated by examining spatial and temporal patterns in chemical and isotopic data in the context of groundwater-age categories defined by tritium and carbon-14. In the Coastal basins, western San Joaquin Valley (SJV), and eastern SJV; 82, 76, and 0% of samples are premodern (pre-1953 recharge), respectively;
Authors
Peter B. McMahon, Matthew K. Landon, Tracy Davis, Michael Wright, Celia Z. Rosecrans, Robert Anders, Michael Land, Justin T. Kulongoski, Andrew G. Hunt
By
Water Resources Mission Area, California Water Science Center, Colorado Water Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Geologic, hydrologic, and water-quality data from multiple-well monitoring sites in the Bunker Hill and Yucaipa Groundwater Subbasins, San Bernardino County, California, 1974–2016

In 1974, the U.S. Geological Survey (USGS), in cooperation with the San Bernardino Valley Municipal Water District, initiated a study to assess the regional groundwater resources in the Bunker Hill Subbasin of the Upper Santa Ana Valley Groundwater Basin in San Bernardino County, California. The study area expanded east into the Yucaipa Subbasin in 1996. This report compiles the geologic (borehole
Authors
Gregory O. Mendez, Robert Anders, Kelly R. McPherson, Wesley R. Danskin
By
Water Resources Mission Area, California Water Science Center

A geochemical approach to determine sources and movement of saline groundwater in a coastal aquifer

Geochemical evaluation of the sources and movement of saline groundwater in coastal aquifers can aid in the initial mapping of the subsurface when geological information is unavailable. Chloride concentrations of groundwater in a coastal aquifer near San Diego, California, range from about 57 to 39,400 mg/L. On the basis of relative proportions of major-ions, the chemical composition is classified
Authors
Robert Anders, Gregory O. Mendez, Kiyoto Futa, Wesley R. Danskin
By
Water Resources Mission Area, California Water Science Center

Water-quality data for the Russian River Basin, Mendocino and Sonoma Counties, California, 2005-2010

Since 2003, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, has been collecting chemical, microbiological, and isotopic data from surface-water and groundwater sites in Mendocino and Sonoma Counties, California. The investigation is being conducted to determine water-quality baseline conditions for the Russian River during the summer months and to characterize the w
Authors
Robert Anders, Karl Davidek, Donald M. Stoeckel
By
Water Resources Mission Area, California Water Science Center

Use of carboxylated microspheres to assess transport potential of Cryptosporidium parvum oocysts at the Russian River water supply facility, Sonoma County, California

Carboxylated microspheres were employed as surrogates to assess the transport potential of Cryptosporidium parvumoocysts during forced- and natural-gradient tests conducted in July and October 2004. The tests involved poorly-sorted, near-surface sediments where groundwater is pumped from an alluvial aquifer underlying the Russian River, Sonoma County, CA. In an off channel infiltration basin and w
Authors
David W. Metge, Ronald W. Harvey, Robert Anders, Donald O. Rosenberry, Donald Seymour, Jay Jasperse
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, California Water Science Center

Water-Quality Data for the Lower Russian River Basin, Sonoma County, California, 2003-2004

In 2003, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, began a study to determine the chemical, microbiological, and isotopic composition of the surface water and ground water in selected areas of the Lower Russian River Basin, Sonoma County, California. This report is a compilation of the hydrologic and water-quality data collected from 10 Russian River sites, 1
Authors
Robert Anders, Karl Davidek, Kathryn M. Koczot

Virus fate and transport during artificial recharge with recycled water

A field‐scale experiment was conducted at a research site using bacterial viruses (bacteriophage) MS2 and PRD1 as surrogates for human viruses, bromide as a conservative tracer, and tertiary‐treated municipal wastewater (recycled water) to investigate the fate and transport of viruses during artificial recharge. Observed virus concentrations were fitted using a mathematical model that simulates vi
Authors
Robert Anders, C.V. Chrysikopoulos
By
Water Resources Mission Area, California Water Science Center

Virus fate and transport during recharge using recycled water at a research field site in the Montebello Forebay, Los Angeles County, California, 1997-2000

Total and fecal coliform bacteria distributions in subsurface water samples collected at a research field site in Los Angeles County were found to increase from nondetectable levels immediately before artificial recharge using tertiary-treated municipal wastewater (recycled water). This rapid increase indicates that bacteria can move through the soil with the percolating recycled water over interv
Authors
Robert Anders, William A. Yanko, Roy A. Schroeder, James L. Jackson

Geohydrology, water quality, and nitrogen geochemistry in the saturated and unsaturated zones beneath various land uses, Riverside and San Bernardino counties, California, 1991-93

The U.S. Geological Survey, in cooperation with the Eastern Municipal Water District, the Metropolitan Water District of Southern California, and the Orange County Water District, has completed a detailed study of the Hemet groundwater basin. The quantity of ground water stored in the basin in August 1992 is estimated to be 327,000 acre-feet. Dissolved-solids concentration ranged from 380 to 700 m
Authors
Terry F. Rees, Daniel J. Bright, Ronald G. Fay, Allen H. Christensen, Robert Anders, Brian S. Baharie, Michael T. Land

Science and Products

link
Standing on the shore line of a pond

Processes Controlling Riverbank Filtration of Pathogens in the Russian River Basin, Sonoma County, California

The Sonoma County Water Agency (SCWA) supplies drinking water to municipalities and water districts in Sonoma and Marin Counties by diverting water from the alluvial aquifer underlying and adjacent to the Russian River. The U.S. Geological Survey, in cooperation with SCWA, is conducting an ongoing research program on water quality conditions in the Russian River and the physical and geochemical...
By
California Water Science Center
link

Processes Controlling Riverbank Filtration of Pathogens in the Russian River Basin, Sonoma County, California

The Sonoma County Water Agency (SCWA) supplies drinking water to municipalities and water districts in Sonoma and Marin Counties by diverting water from the alluvial aquifer underlying and adjacent to the Russian River. The U.S. Geological Survey, in cooperation with SCWA, is conducting an ongoing research program on water quality conditions in the Russian River and the physical and geochemical...
Learn More
link
Looking at a bridge over a river

Enterococcus Surface Protein as an Indicator of Human Fecal Pollution in the Lower Russian River Basin

Preliminary evaluation of water-quality data collected in the Lower Russian River Basin, Sonoma County, California during an on-going program by the U.S. Geological Survey (USGS), in cooperation with Sonoma County Water Agency (SCWA), indicated that there is considerable variability in bacterial concentrations from reach to reach and from year to year. Furthermore, tributaries that maintained...
By
California Water Science Center
link

Enterococcus Surface Protein as an Indicator of Human Fecal Pollution in the Lower Russian River Basin

Preliminary evaluation of water-quality data collected in the Lower Russian River Basin, Sonoma County, California during an on-going program by the U.S. Geological Survey (USGS), in cooperation with Sonoma County Water Agency (SCWA), indicated that there is considerable variability in bacterial concentrations from reach to reach and from year to year. Furthermore, tributaries that maintained...
Learn More

Water chemistry data for samples collected at groundwater sites in the Santa Maria Valley Oil Field study area, July 2018–March 2019, Santa Barbara County, California

The California State Water Resources Control Board (State Water Board) initiated the Oil and Gas Regional Monitoring Program (RMP) to assess effects of oil and gas development on groundwater designated for any beneficial use. The U.S. Geological Survey (USGS) is the technical lead in conducting the RMP through the California Oil, Gas, and Groundwater (COGG) Program, working in cooperation with the
By
California Water Science Center

Groundwater quality near the Placerita Oil Field, California, 2018

Groundwater-quality data and potential fluid-migration pathways near the Placerita Oil Field in Los Angeles County, California, were examined by the U.S. Geological Survey to determine if oil-field fluids (water and gas from oil-producing and non-producing zones) have mixed with groundwater resources. Six of the 13 new groundwater samples collected for this study contained petroleum hydrocarbons,
Authors
Jennifer S. Stanton, Matthew K. Landon, David H. Shimabukuro, Justin T. Kulongoski, Andrew G. Hunt, Peter B. McMahon, Isabelle M. Cozzarelli, Robert Anders, Theron A. Sowers
By
Water Resources Mission Area, California Water Science Center, New England Water Science Center

Relative risk of groundwater-quality degradation near California (USA) oil fields estimated from 3H, 14C, and 4He

Relative risks of groundwater-quality degradation near selected California oil fields are estimated by examining spatial and temporal patterns in chemical and isotopic data in the context of groundwater-age categories defined by tritium and carbon-14. In the Coastal basins, western San Joaquin Valley (SJV), and eastern SJV; 82, 76, and 0% of samples are premodern (pre-1953 recharge), respectively;
Authors
Peter B. McMahon, Matthew K. Landon, Tracy Davis, Michael Wright, Celia Z. Rosecrans, Robert Anders, Michael Land, Justin T. Kulongoski, Andrew G. Hunt
By
Water Resources Mission Area, California Water Science Center, Colorado Water Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Geologic, hydrologic, and water-quality data from multiple-well monitoring sites in the Bunker Hill and Yucaipa Groundwater Subbasins, San Bernardino County, California, 1974–2016

In 1974, the U.S. Geological Survey (USGS), in cooperation with the San Bernardino Valley Municipal Water District, initiated a study to assess the regional groundwater resources in the Bunker Hill Subbasin of the Upper Santa Ana Valley Groundwater Basin in San Bernardino County, California. The study area expanded east into the Yucaipa Subbasin in 1996. This report compiles the geologic (borehole
Authors
Gregory O. Mendez, Robert Anders, Kelly R. McPherson, Wesley R. Danskin
By
Water Resources Mission Area, California Water Science Center

A geochemical approach to determine sources and movement of saline groundwater in a coastal aquifer

Geochemical evaluation of the sources and movement of saline groundwater in coastal aquifers can aid in the initial mapping of the subsurface when geological information is unavailable. Chloride concentrations of groundwater in a coastal aquifer near San Diego, California, range from about 57 to 39,400 mg/L. On the basis of relative proportions of major-ions, the chemical composition is classified
Authors
Robert Anders, Gregory O. Mendez, Kiyoto Futa, Wesley R. Danskin
By
Water Resources Mission Area, California Water Science Center

Water-quality data for the Russian River Basin, Mendocino and Sonoma Counties, California, 2005-2010

Since 2003, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, has been collecting chemical, microbiological, and isotopic data from surface-water and groundwater sites in Mendocino and Sonoma Counties, California. The investigation is being conducted to determine water-quality baseline conditions for the Russian River during the summer months and to characterize the w
Authors
Robert Anders, Karl Davidek, Donald M. Stoeckel
By
Water Resources Mission Area, California Water Science Center

Use of carboxylated microspheres to assess transport potential of Cryptosporidium parvum oocysts at the Russian River water supply facility, Sonoma County, California

Carboxylated microspheres were employed as surrogates to assess the transport potential of Cryptosporidium parvumoocysts during forced- and natural-gradient tests conducted in July and October 2004. The tests involved poorly-sorted, near-surface sediments where groundwater is pumped from an alluvial aquifer underlying the Russian River, Sonoma County, CA. In an off channel infiltration basin and w
Authors
David W. Metge, Ronald W. Harvey, Robert Anders, Donald O. Rosenberry, Donald Seymour, Jay Jasperse
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, California Water Science Center

Water-Quality Data for the Lower Russian River Basin, Sonoma County, California, 2003-2004

In 2003, the U.S. Geological Survey, in cooperation with the Sonoma County Water Agency, began a study to determine the chemical, microbiological, and isotopic composition of the surface water and ground water in selected areas of the Lower Russian River Basin, Sonoma County, California. This report is a compilation of the hydrologic and water-quality data collected from 10 Russian River sites, 1
Authors
Robert Anders, Karl Davidek, Kathryn M. Koczot

Virus fate and transport during artificial recharge with recycled water

A field‐scale experiment was conducted at a research site using bacterial viruses (bacteriophage) MS2 and PRD1 as surrogates for human viruses, bromide as a conservative tracer, and tertiary‐treated municipal wastewater (recycled water) to investigate the fate and transport of viruses during artificial recharge. Observed virus concentrations were fitted using a mathematical model that simulates vi
Authors
Robert Anders, C.V. Chrysikopoulos
By
Water Resources Mission Area, California Water Science Center

Virus fate and transport during recharge using recycled water at a research field site in the Montebello Forebay, Los Angeles County, California, 1997-2000

Total and fecal coliform bacteria distributions in subsurface water samples collected at a research field site in Los Angeles County were found to increase from nondetectable levels immediately before artificial recharge using tertiary-treated municipal wastewater (recycled water). This rapid increase indicates that bacteria can move through the soil with the percolating recycled water over interv
Authors
Robert Anders, William A. Yanko, Roy A. Schroeder, James L. Jackson

Geohydrology, water quality, and nitrogen geochemistry in the saturated and unsaturated zones beneath various land uses, Riverside and San Bernardino counties, California, 1991-93

The U.S. Geological Survey, in cooperation with the Eastern Municipal Water District, the Metropolitan Water District of Southern California, and the Orange County Water District, has completed a detailed study of the Hemet groundwater basin. The quantity of ground water stored in the basin in August 1992 is estimated to be 327,000 acre-feet. Dissolved-solids concentration ranged from 380 to 700 m
Authors
Terry F. Rees, Daniel J. Bright, Ronald G. Fay, Allen H. Christensen, Robert Anders, Brian S. Baharie, Michael T. Land
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