Tyler D. Johnson Elise Watson Ken Belitz 2018 Vector Digital Data Set (Polygon) https://doi.org/10.5066/F79Z93CN Belitz, Kenneth Fram, M.S. Johnson, T.D. 20150626 Publication (Journal) Environmental Science & Technology 49 (14), 8330-8338 United States ACS withheld The California Groundwater Ambient Monitoring and Assessment Program (GAMA) is a statewide, comprehensive assessment of groundwater quality designed to help better understand and identify risks to groundwater resources. GAMA is being implemented by the California State Water Resources Control Board. The USGS is the technical lead for the Priority Basin Project (PBP), one of the components of the GAMA Program. The initial focus of the GAMA Priority Basin Project in 2004 to 2012 was on assessment of water-quality in groundwater resources used for public drinking water supply (Belitz and others, 2003; 2015). Groundwater basins and sub-basins (472 in total) were prioritized based upon a number of factors (Belitz and others 2003). Two hundred and twenty-seven of these basins and additional areas outside of basins were subsequently grouped into 35 study units comprising 87 Study Areas. The basin and sub-basin boundaries, local geology, local knowledge, and watershed data were used to define the Study Areas. The Study Areas each were divided into equal-area grid cells collectively referred as a "study area grid". The number and size of cells generated for each Study Area was based upon the size of the area being sampled, and the number of public-supply wells available to sample. Three Study Areas contained an insufficient number of public-supply wells for division into a study area grid and were instead directly sampled. The number of cells in a study area grid ranged from 7 to 122 (median 20), and the size of the cells ranged from 4 to 471 km2 (median 25 km2). Additional information about the design of individual study area grids can be found in the reports listed below. The 87 Study Areas are collected and assembled here into one GIS dataset. This digital data set was created as part of the study design for a statewide, comprehensive ground-water monitoring and assessment program (Belitz and others, 2003; 2015; California State Water Resources Control Board, 2003). This data set contains grid cells that are spatially distributed across study areas, providing a basis for equal area sampling of selected groundwater basins. These study area grids were used in Belitz and others (2015); this Data Release provides them as a GIS dataset. For more information on sampling design, see the individual Study Unit reports (listed in the Entity and Attribute Information section). 20060101 20141231 ground condition Complete None planned -124.4445 -113.7503 42.0432 32.4890 USGS Thesaurus water-quality Groundwater None GAMA Priority Basin Project Public supply drinking water USGS Metadata Identifier USGS:5936e071e4b0f6c2d0d884c8 Common geographic areas California United States None Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. U.S. Geological Survey, PACIFIC REGION Tyler Johnson Geographer mailing address

4165 SPRUANCE ROAD

San Diego CA 92101 619-225-6100 619-225-6101 tyjohns@usgs.gov US Geological Survey California Water Science Center Groundwater Ambient Monitoring and Assessment Program Esri ArcGIS 10.5 (Build 6491) Service Pack N/A (Build N/A) No formal attribute accuracy tests were conducted. While Scott(1990) does create a topology of grid cells within the selected study area, topology does not exist outside of the study area. Thus, gaps or slight overlaps may exist between grids of neighboring study areas. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable. Scott, Jon C. 1990 Digital and/or Hardcopy Resources Reston, VA U.S. Geological Survey https://pubs.er.usgs.gov/publication/wri904101 Digital and/or Hardcopy Resources 1990 publication date Scott (1990) This program was used to generate equal area grid cells. California Department of Water Resources 05032002 Digital and/or Hardcopy Resources California Department of Water Resources https://www.waterplan.water.ca.gov/ 250000 Digital and/or Hardcopy Resources 2006 ground condition DWR_basins Groundwater basins were used to delineate study areas within each Study Unit. However, this draft version is no longer available, as it has been superseded by the finalized version. There are differences between this draft version and the newer version of bulletin 118 in both the total number of groundwater basins and in the delineation of the groundwater basins. Johnson, Tyler and Kenneth Belitz 2003 Vector Digital Data Set Reston, VA U.S. Geological Survey https://water.usgs.gov/GIS/metadata/usgswrd/XML/ca_provinces.xml 250000 Digital and/or Hardcopy Resources 2004 2012 ground condition Source Input 3 Provinces were used to define the boundaries of certain study areas. Study Units were divided into sub-units (Study Areas) based on hydrogeologic characteristics. If groundwater basin boundaries were not present in an area (for example, the Central Sierras), then a watershed boundary was used. In some areas, a buffer around target wells was used as the boundary. The buffer radius varied between study units, however 3 km was generally used in most areas. See individual reports for further details. Two versions of the Scott (1990) program were used, a polygon based older version, and a newer raster based version. The raster based version produces a stair-stepped pattern along curves and therefore may overlap neighboring study areas slightly. 20130101 Grid cells were generated for each study and then merged into a single polygon shapefile. Note that the Sierra Nevada Regional study area in this dataset and used in the larger work citation (Belitz, K., Johnson, T.D., Fram. M.S., 2015), is different than the study area defined in the original USGS report for the Sierra Nevada Regional study unit (Fram, M.S., and Belitz, Kenneth, 2014). 20130101 Vector Simple FALSE 0 FALSE FALSE coordinate pair 0.6096 0.6096 meters D_North_American_1983 GRS_1980 6378137.0 298.257222101 Attribute Table Table containing attribute information associated with the data set. Producer defined Feature Class 0 FID FID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. SU SU String 254 0 0 Province The province name in which the Study Area is a part of. Producer defined Desert - Basin and Range The study area is located in the Desert - Basin and Range Province Producer defined Klamath Mountains - Cascade Range and Modoc Plateau The study area is located in the Klamath Mountains - Cascade Range Province Producer defined Northern Coast Ranges The study area is located in the Northern Coast Ranges Province Producer defined Sacramento Valley The study area is located in the Sacramento Valley Province Producer defined San Diego Drainages The study area is located in the San Diego Drainages Province Producer defined San Joaquin Valley The study area is located in the San Joaquin Valley Province Producer defined Sierra Nevada The study area is located in the Sierra Nevada Province Producer defined Southern Coast Ranges The study area is located in the Southern Coast Ranges Province Producer defined Transverse and Selected Peninsular Range The study area is located in the Transverse and Selected Peninsular Range Province Producer defined Province String 75 0 0 StudyArea Name of the Study Area Producer defined The name of the Study Area StudyArea String 150 0 0 RockType Identifies whether the study area is identified as either predominantly alluvial or hard rock. Producer defined Alluvial Identifies the study area as having mostly alluvial basin properties. Producer defined Alluvial and Hard Rock Identifies the study area as having a mixture of hard rock and alluvial areas. Producer defined Hard Rock Identifies the study area as having mostly hard rock properties. Producer defined RockType String 40 0 0 CELL Grid cell number. Grid cells are sequentially numbered within each Study Area. A value of 0 indicates that the Study Area was not divided into cells. Producer defined 0 122 CELL Integer 10 10 0 SubGrid_ID Grid Identifier. Includes Province and Study Area. Producer defined Grid Identifier. Includes Province and Study Area. SubGrid_ID String 40 0 0 SubGridCel Unique cell identifier. Producer defined A concatenation of the SubGrid ID + Cell Number. SubGridCel String 50 0 0 AreaSqKm Area in square kilometers Producer defined 4.14655622736 470.653333712 AreaSqKm Double 19 0 0 SIR_Ref References the USGS Scientific Investigation Report (SIR) that includes more information about the Study Area. Producer defined na Not Available Producer defined S1 Landon, M.K., Belitz, Kenneth, Jurgens, B.C., Kulongoski, J.T., and Johnson, T.D., 2010, Status and understanding of groundwater quality in the Central–Eastside San Joaquin Basin, 2006: California GAMA Priority Basin project: U.S. Geological Survey Scientific Investigations Report 2009–5266, 97 p. https://pubs.usgs.gov/sir/2009/5266/ Producer defined S10 Burton, C.A., Shelton, J.L., and Belitz, Kenneth, 2012, Status and understanding of groundwater quality in the two southern San Joaquin Valley study units, 2005–2006—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5218, 150 p. https://pubs.usgs.gov/sir/2011/5218/ Producer defined S11 Dawson, B.J.M., and Belitz, Kenneth, 2012, Status of groundwater quality in the California Desert Region, 2006–2008—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012–5040, 110 p. https://pubs.usgs.gov/sir/2012/5040/ Producer defined S12 Goldrath, Dara, Fram, M.S., Land, Michael, and Belitz, Kenneth, 2012, Status of groundwater quality in the Coastal Los Angeles Basin, 2006—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012–5048, 64 p. https://pubs.usgs.gov/sir/2012/5048/ Producer defined S13 Kent, Robert, and Belitz, Kenneth, 2012, Status of groundwater quality in the Upper Santa Ana Watershed, November 2006–March 2007—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012–5052, 88 p. https://pubs.usgs.gov/sir/2012/5052/ Producer defined S14 Shelton, J.L., Fram, M.S., Belitz, Kenneth, and Jurgens, B.C., 2013, Status and understanding of groundwater quality in the Madera-Chowchilla Study Unit, 2008—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012–5094, 86 p. https://pubs.usgs.gov/sir/2012/5094 Producer defined S15 Parsons, M.C., Kulongoski, J.T., and Belitz, Kenneth, 2013, Status and understanding of groundwater quality in the San Francisco Bay groundwater basins, 2007—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2012–5248, 76 p. https://pubs.usgs.gov/sir/2012/5248/ Producer defined S16 Burton, C.A., Land, M.T., and Belitz, Kenneth, 2013, Status and understanding of groundwater quality in the South Coast Range–Coastal study unit, 2008—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2013–5053, 86 p. https://pubs.usgs.gov/sir/2013/5053/ Producer defined S17 Parsons, M.C., Hancock, T.C., Kulongoski, J.T., and Belitz, Kenneth, 2014, Status of groundwater quality in the Borrego Valley, Central Desert, and Low-Use Basins of the Mojave and Sonoran Deserts study unit, 2008–2010—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014–5001, 88 p. https://pubs.usgs.gov/sir/2014/5001/ Producer defined S18 Parsons, M.C., Kulongoski, J.T., and Belitz, Kenneth, 2014, Status and understanding of groundwater quality in the South Coast Interior groundwater basins, 2008—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014–5023, 68 p. https://pubs.usgs.gov/sir/2014/5023/ Producer defined S19 Bennett, G.L., V, Fram, M.S., and Belitz, Kenneth, 2014, Status and understanding of groundwater quality in the Klamath Mountains study unit, 2010—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014–5065, 58 p. https://dx.doi.org/10.3133/sir20145065 Producer defined S2 Kulongoski, Justin T., Belitz, Kenneth, Landon, M.K, Farrar, Christopher, 2010, Status and understanding of groundwater quality in the North San Francisco Bay groundwater basins, 2004: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2010-5089, 88p. https://pubs.usgs.gov/sir/2010/5089/ Producer defined S20 Fram, M.S., and Belitz, Kenneth, 2014, Status and understanding of groundwater quality in the Sierra Nevada Regional study unit, 2008—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014-5174, 118 p. https://dx.doi.org/10.3133/20145174 Producer defined S21 Fram, M.S., and Shelton, J.L., 2015, Status and understanding of groundwater quality in the Cascade Range and Modoc Plateau study unit, 2010—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014-5238, 131 p. https://dx.doi.org/10.3133/sir20145238 Producer defined S22 Mathany, T.M. and Belitz, Kenneth, 2014, Status and understanding of groundwater quality in the Northern Coast Ranges study unit, 2009: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2014-5215, 86 p. https://dx.doi.org/10.3133/sir20145215 Producer defined S23 Fram, M.S., 2017, Groundwater quality in the Western San Joaquin Valley groundwater basins, 2010: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2017-5032, 131 p. https://pubs.er.usgs.gov/publication/sir20175032 Producer defined S24 Davis, T. A. and Kulongoski, J.T., 2016, Status of groundwater quality in the Santa Barbara study unit, 2011: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2016-5112, 70 p. https://dx.doi.org/10.3133/sir20165112 Producer defined S25 Mathany, T.M. and Burton, C.A., 2017, Status and understanding of groundwater quality in the Bear Valley and Lake Arrowhead Hard Rock area study unit, 2010: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2017–5043, 71 p. https://doi.org/10.3133/sir20175043. Producer defined S3 Bennett, G.L., V, Fram, M.S., Belitz, Kenneth, and Jurgens, B.C., 2010, Status and understanding of groundwater quality in the northern San Joaquin Basin, 2005: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2010-5175, 82 p. https://pubs.usgs.gov/sir/2010/5175/ Producer defined S4 Bennett, G.L., V, Fram, M.S., and Belitz, Kenneth, 2011, Status of groundwater quality in the Southern, Middle, and Northern Sacramento Valley study units, 2005–08—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5002, 120 p. https://pubs.usgs.gov/sir/2011/5002/ Producer defined S5 Burton, C.A., Montrella, Joseph, Landon, M.K., and Belitz, Kenneth, 2011, Status and understanding of groundwater quality in the Santa Clara River Valley, 2007—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5052, 86 p. https://pubs.usgs.gov/sir/2011/5052/ Producer defined S6 Kulongoski, J.T., and Belitz, Kenneth, 2011, Status and understanding of groundwater quality in the Monterey Bay and Salinas Valley Basins, 2005—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5058, 84 p. https://pubs.usgs.gov/sir/2011/5058/ Producer defined S7 Wright, M.T., and Belitz, K., 2011, Status and understanding of groundwater quality in the San Diego Drainages Hydrogeologic Province, 2004—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5154, 100 p. https://pubs.usgs.gov/sir/2011/5154/ Producer defined S8 Land, Michael, Kulongoski, J.T., and Belitz, Kenneth, 2012, Status of groundwater quality in the San Fernando–San Gabriel study unit, 2005—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011–5206, 66 p. https://pubs.usgs.gov/sir/2011/5206/ Producer defined S9 Fram, M.S., and Belitz, Kenneth, 2012, Status and Understanding of Groundwater Quality in the Tahoe-Martis, Central Sierra, and Southern Sierra Study Units, 2006–2007—California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2011-5216, 222 p. https://pubs.usgs.gov/sir/2011/5216/ Producer defined SIR_Ref String 3 0 0 The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set. The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Vector Digital Data Set (Polygon) https://doi.org/10.5066/F79Z93CN None. No fees are applicable for obtaining the data set. 20200812 U.S. Geological Survey, PACIFIC REGION Tyler Johnson Geographer mailing address

4165 SPRUANCE ROAD

San Diego CA 92101 619-225-6100 619-225-6101 tyjohns@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time Esri ArcGIS 13.3.0.52636 GAMA_PBP_PSA_Grid_Cells GAMA_PBP_PSA_Grid_Cells 002 0.000 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_Albers <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.3.0'><WKT>PROJCS[&quot;NAD_1983_Albers&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Albers&quot;],PARAMETER[&quot;False_Easting&quot;,0.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-120.0],PARAMETER[&quot;Standard_Parallel_1&quot;,29.5],PARAMETER[&quot;Standard_Parallel_2&quot;,45.5],PARAMETER[&quot;Latitude_Of_Origin&quot;,23.0],UNIT[&quot;Meter&quot;,1.0]]</WKT><XOrigin>-16901100</XOrigin><YOrigin>-6972200</YOrigin><XYScale>266467840.99085236</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision></ProjectedCoordinateSystem> 20240906 15075700 20240906 15075700 Shapefile 0.000 dataset 0 20240906