Krishangi D. Groover Sarah A. Roberts Jeffery W. McPherson Michael R. Rosen 20220207 tabular digital data U.S. Geological Survey Data Release https://doi.org/10.5066/P9VIK7LK Due to declining water levels and increasing salinity in the Salton Sea which may increase the hazards to wildlife, the U.S. Geological Survey and U.S. Bureau of Reclamation are re-evaluating selenium concentrations in the region. As part of this work, selenium concentrations in water and sediment samples and selected other inorganic constituents were compiled from published reports, public databases, and unpublished archives into a tabulated spreadsheet. This spreadsheet represents a rapid synthesis of available data on selenium concentrations in water and sediment in the region surrounding the Salton Sea, however it does not include all data ever published in the region. Additionally, the data compilation was done with an emphasis on selenium concentrations measured after 2005, therefore earlier selenium data may be under-represented. These data were compiled as part of an effort to assess available data on selenium concentrations and data gaps in science regarding selenium in and around the Salton Sea. This project was done in response to rapidly forming wetlands on the margins of the Salton Sea caused by declines in water level elevation. This data release contains both published and previously unpublished data focusing on concentrations of selenium in water and sediment samples collected in and near the Salton Sea, California, 1966-2020, as well as some other constituents such as total dissolved solids, lead, and mercury. These data have not been quality assured to account for differences in reporting limits or analytical methods between data sources. Result values were not rounded or censored and are presented as documented in original publication sources. Data also have not been checked for duplication of individual result values based on a combination of unique sample type, site, and date across multiple publication sources. The compiled data include samples from different sample mediums (water or sediment) collected at the same location and on the same sample date; these paired samples are not considered duplicates for the purposes of this data release. Sample times available for some samples in the U.S. Geological Survey National Water Information System that are a few minutes or hours apart on the same sample date for the same sample medium also are not considered duplicated. Caution is advised when using this dataset and users are urged to visit original data sources for more information. 1966 2021 See Supplemental Info Complete As needed -116.6426 -114.4260 36.1155 32.4423 ISO 19115 Topic Category environment geoscientificInformation USGS Thesaurus selenium surface water quality groundwater quality unconsolidated deposits chemical analysis USGS Metadata Identifier USGS:5f85e10082cebef40f14c674 Common geographic areas Salton Sea California None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Krishangi Groover U.S. Geological Survey, SOUTHWEST REGION Hydrologist mailing address

4165 Spruance Road

San Diego CA 92101-0812 US 619-225-6144 619-225-6101 kgroover@usgs.gov Unpublished data included in this data release were provided as a courtesy by the U.S. Bureau of Reclamation (J. McPherson), University of California Riverside (C. Amrhein), and U.S. Geological Survey (Columbia Environmental Research Center, T. May, B. Martin, M. Ricca, K. Miles; and California Water Science Center, M.R. Rosen). All other data were compiled from journal articles, agency publications, and public databases. These data were compiled into a Microsoft Excel (tm) spreadsheet file (extension .xlsx), which can be opened using spreadsheeting programs. Additional data information is available in a comma separated value formatted data dictionary, and a tab delimited text file. Any use of trade, firm or product names is for descriptive purposes only and does not constitute endorsement by the U.S. Government. Data are included as reported by publications and individuals contacted for this study. Data from different publication sources represents 1) samples collected using different methods and 2) concentrations of selenium and other chemical constituents measured using different analytical techniques. No quality control evaluations were done to compare data from different sources. Concentration data are reported with the detection limit given by the source of the data, if available, and the compiled data were not re-censored to a uniform detection limit. No logical tests were performed. Data were not checked for duplicates. Data were not rounded. This data release does not include all published data for the Salton Sea region and Colorado River watershed and contains minimal data on the Colorado River. An effort was made to obtain as much published and unpublished data on selenium in the Salton Sea region as possible, however due to time constraints data from several publications-particularly publications pre-dating 2005-may not have been included. When possible data on other constituents reported by the other publication sources were compiled, however less focus was placed on these and this data release may not represent a complete record of these constituents. Latitude and longitudes are presented as reported. Positional accuracies are unknown. Some samples did not have reported latitude and longitudes and just had locations on low resolution maps. Latitude and longitude for these samples were approximated using satellite imagery and topographic maps to determine locations for reporting purposes. No elevation or altitude data are included in this data release. A. Keith Miles Mark A. Ricca Anne Meckstroth Sarah E. Spring 2009 publication U.S. Geological Survey Open-File Report n/a US Geological Survey https://doi.org/10.3133/ofr20091276 Digital and/or Hardcopy 20060401 20081012 observed Miles and others, 2009 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Michael K. Saiki Barbara A. Martin Thomas W. May 2012 publication Environmental Monitoring and Assessment vol. 184, issue 9 n/a Springer Science and Business Media LLC p. 5623-5640 https://doi.org/10.1007/s10661-011-2367-1 Digital and/or Hardcopy 200810 200604 observed Saiki and others, 2012 Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. Richard A. Vogl Ryan N. Henry 2002 publication Hydrobiologia vol. 473, issue 1/3 n/a Springer Science and Business Media LLC p. 47-54 https://doi.org/10.1023/A:1016509113214 Digital and/or Hardcopy 199901 observed Vogl and Henry, 2002 Selenium concentrations in sediment. Please see data file and data dictionary for more information. Paula I. Johnson Richard M. Gersberg Mark Rigby Sujoy Roy 200905 publication Ecological Engineering vol. 35, issue 5 n/a Elsevier BV p. 908-913 https://doi.org/10.1016/j.ecoleng.2008.12.020 Digital and/or Hardcopy 20060601 20070615 observed Johnson and others, 2009 Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. Earl R. Byron Harry M. Ohlendorf 200712 publication Lake and Reservoir Management vol. 23, issue 5 n/a Informa UK Limited p. 630-636 https://doi.org/10.1080/07438140709354042 Digital and/or Hardcopy 20050424 observed Byron and Ohlendorf, 2007 Selenium concentrations in sediment. Please see data file and data dictionary for more information. Amrhein, C. Smith, W. 2010 tabular digital data University of California Riverside, department of Environmental Sciences unpublished report. Permission given for data release none Digital and/or Hardcopy 20100505 20100629 observed Amrhein and Smith, 2010 Selenium concentrations in sediment. Please see data file and data dictionary for more information. California State Water Resources Control Board 2020 application/service California Water Board Surface Water Ambient Monitoring Program (SWAMP) dataset retrieval, accessed August 4, 2020: https://ceden.waterboards.ca.gov/AdvancedQueryTool https://ceden.waterboards.ca.gov/AdvancedQueryTool Digital and/or Hardcopy 20020506 20190411 observed SWAMP CEDEN Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. CH2M Hill 2006 vector digital data Public database and GIS metadata, accessed October 19th, 2020. https://map.dfg.ca.gov/metadata/ds0297.html Digital and/or Hardcopy 20050401 20050405 observed CH2M Hill, 2006, Soil Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. CH2M Hill 2006 vector digital data Public database and GIS metadata, accessed October 19th, 2020. https://map.dfg.ca.gov/metadata/ds0299.html Digital and/or Hardcopy 19890101 20050405 observed CH2M Hill, 2006, Sediment Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. CH2M Hill 2006 tabular digital data Public database and GIS metadata, accessed October 19th, 2020. https://map.dfg.ca.gov/metadata/ds0298.html Digital and/or Hardcopy 19860814 20050615 observed CH2M Hill, 2006, Water Selenium concentrations in water. Please see data file and data dictionary for more information. Zane Tucker Macfarlane 2018 publication n/a Unpublished PDF from ResearchGate. Undergraduate thesis, Pomona College https://doi.org/10.13140/rg.2.2.29512.47367 Digital and/or Hardcopy 2018 publication date Macfarlane, 2018 Selenium concentrations in sediment. Please see data file and data dictionary for more information. Thomas W. May Mike W. Walther Brumbaugh, W.G. 2006 tabular digital data Unpublished USGS report; data shared with authors on October 26, 2020 Digital and/or Hardcopy 200508 200604 observed May and others, 2006 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Thomas W. May Mike W. Walther William G. Brumbaugh 2007 publication Open-File Report 2007-1113 n/a US Geological Survey https://doi.org/10.3133/ofr20071113 Digital and/or Hardcopy 20061011 20070107 observed May and others, 2007 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Thomas W. May Michael W. Walther Michael K. Saiki William G. Brumbaugh 2009 publication Open-File Report 2009-1011 n/a US Geological Survey https://doi.org/10.3133/ofr20091011 Digital and/or Hardcopy 20080410 20080715 observed May and others, 2009a Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Thomas W. May Michael J. Walther Michael K. Saiki William G. Brumbaugh 2009 publication Open-File Report 2009-1123 n/a US Geological Survey https://doi.org/10.3133/ofr20091123 Digital and/or Hardcopy 20081015 20090111 observed May and others, 2009b Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. Thomas W. May Michael J. Walther Michael K. Saiki William G. Brumbaugh 2009 publication Open-File Report 2009-1230 n/a US Geological Survey https://doi.org/10.3133/ofr20091230 Digital and/or Hardcopy 20090416 20090425 observed May and others, 2009c Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Michael K. Saiki Barbara A. Martin Thomas W. May 2008 publication Open-File Report 2008-1271 n/a US Geological Survey https://doi.org/10.3133/ofr20081271 Digital and/or Hardcopy 20070417 20080115 observed Saiki and others, 2008 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Kathrin Schilling Juan Fernando VillaRomero Céline Pallud 20180906 publication Biogeochemistry vol. 140, issue 3 n/a Springer Science and Business Media LLC p. 285-298 https://doi.org/10.1007/s10533-018-0492-4 Digital and/or Hardcopy 2018 publication date Schilling and others, 2018 Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. Roy A. Schroeder 2004 publication Scientific Investigations Report 2004-5036 n/a US Geological Survey https://doi.org/10.3133/sir20045036 Digital and/or Hardcopy 19980720 19990427 observed Schroeder, 2004 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. R.A. Schroeder Mick Rivera 1993 publication Open-File Report 93-83 n/a U.S. Geological Survey https://doi.org/10.3133/ofr9383 Digital and/or Hardcopy 1989 1990 observed Schroeder and Rivera, 1993 Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. David B. Smith Federico Solano Laurel G. Woodruff William F. Cannon Karl J. Ellefsen 2019 publication n/a US Geological Survey https://doi.org/10.3133/sir20175118 Digital and/or Hardcopy 20100530 20100604 observed Smith and others, 2019 Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. J.M. Tobin 2001 tabular digital data M.S. Thesis, University of California Riverside Digital and/or Hardcopy 20110506 20110519 observed Tobin, 2001 Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. U.S. Bureau of Reclamation 2020 tabular digital data Unpublished data, personal communication, September 3, 2020. Digital and/or Hardcopy 1999 2020 observed USBR data Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. A.K. Miles M.A. Ricca 2018 tabular digital data Unpublished data, personal communication, September 2020 Digital and/or Hardcopy 200604 201606 observed USGS Miles Selenium concentrations in sediment and water. Please see data file and data dictionary for more information. M.R. Rosen 2020 tabular digital data Unpublished data, personal communication, October 27, 2020 Digital and/or Hardcopy 200703 observed USGS Rosen Selenium concentrations in sediment. Please see data file and data dictionary for more information. U.S. Geological Survey 2004 tabular digital data U.S. Geological Survey public database, accessed August 28, 2020 https://mrdata.usgs.gov/nure/sediment/ Digital and/or Hardcopy 1995 publication date USGS NURE, 2004 Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. U.S. Geological Survey 2016 tabular digital data U.S. Geological Survey public database, accessed September 9, 2020 https://mrdata.usgs.gov/ngdb/soil/ Digital and/or Hardcopy 196610 200109 observed USGS MRDATA, 2016 Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. U.S. Geological Survey 2021 tabular digital data U.S. Geological Survey public database, accessed September 17, 2021 https://doi.org/10.5066/F7P55KJN Digital and/or Hardcopy 197302 202003 observed USGS NWIS 09172021 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Juan Fernando VillaRomero Matteo Kausch Céline Pallud 2013 publication Hydrobiologia vol. 709, issue 1 n/a Springer Science and Business Media LLC p. 129-142 https://doi.org/10.1007/s10750-013-1443-7 Digital and/or Hardcopy 201107 observed VillaRomero and others, 2013 Selenium and selected inorganic constituents in sediment. Please see data file and data dictionary for more information. Elvis Genbo Xu Cindy Bui Cassandra Lamerdin Daniel Schlenk 2016 publication Science of The Total Environment vol. 559 n/a Elsevier BV p. 130-140 https://doi.org/10.1016/j.scitotenv.2016.03.144 Digital and/or Hardcopy 20110511 20121017 observed Xu and others, 2016 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. A. Keith Miles Mark A. Ricca 2011 tabular digital data U.S. Geological Survey unpublished annual report, 45 p. Digital and/or Hardcopy 20090415 20101105 observed Miles and Ricca, 2011 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. U.S. Geological Survey 2021 tabular digital data U.S. Geological Survey public database, accessed October 1, 2021 https://doi.org/10.5066/F7P55KJN Digital and/or Hardcopy 1974 2020 ground condition USGS NWIS 10012021 Selenium and selected inorganic constituents in sediment and water. Please see data file and data dictionary for more information. Published reports and public databases were searched for data pertaining to selenium in water and sediment primarily associated with the Salton Sea region. Staff contacts at U.S. Bureau of Reclamation and U.S. Geological Survey provided additional previously unpublished data for inclusion in this data release. Public databases were: California Environmental Data Exchange (CEDEN) for the State Water Boards' Surface Water Ambient Monitoring Program (SWAMP) dataset; California Fish and Wildlife BIOS; U.S. Geological Survey National Water Information System (NWIS); and U.S. Geological Survey Mineral Resource Database System (MRDATA). See the 'citation' column in the 'WaterandSediment_data.xlsx' data file for links to databases and other information on data publication sources. 20201030 Data were compiled with an emphasis on selenium, and some effort was made to include selected other constituents when possible. Data locations were included as reported, however many data points only had map figures with sample locations instead of reported locations. Latitude and longitude for these data were estimated by comparing maps to satellite imagery and topographic maps. Latitude and longitudes are included as columns in the 'WaterandSediment_data.xlsx' data file. Efforts were made to format sample dates for consistency, however not all samples had reported sample dates. Dates for these samples were estimated for plotting purposes and may not represent the actual sample date. Many sources did not report detection limits or analytical methods for data in this compilation. Links to descriptions of analytical techniques are available in the data dictionary associated with this dataset and the supplementary file 'WaterandSediment_methodsexplanation.txt' file. 20201030 Data in the spreadsheet were not checked for duplicates, however an effort was made to check data for errors against original databases. Data were not rounded and are presented as found or retrieved from databases and publication sources. 20201030 Data are compiled into a Microsoft Excel (tm) spreadsheet file called 'WaterandSediment_data.xlsx' for water and sediment. Column information and explanation of abbreviations are available in a data dictionary called 'WaterandSediment_datadictionary.csv'. Explanations of reported analytical methods are in the 'WaterandSediment_methodexplanation.txt' file. All files (data, data dictionary, and methods explanation) are available online at: https://doi.org/10.5066/P9VIK7LK U.S. Geological Survey USGS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9VIK7LK None 20220207 Krishangi Groover U.S. Geological Survey, SOUTHWEST REGION Hydrologist mailing address

4165 Spruance Road

San Diego CA 92101-0812 US 619-225-6144 619-225-6101 kgroover@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998