Suzanne Paschke M. Alisa Mast 20240503 shapefiles and rasters Denver, Colorado U.S. Geological Survey data release https://doi.org/10.5066/P9CJQDDU Paschke, Suzanne S. Mast, M. Alisa Gardner, Philip M. Newman, Connor P. Watts, Kenneth R. 2024 publication Scientific Investigations Report 2023–5094 Denver, Colorado U.S. Geological Survey 58 p. https://doi.org/10.3133/sir20235094 Geospatial datasets were developed to estimate the altitude of the top of bedrock, altitude of the top of the Paradox salt, altitude of the water table in the alluvial aquifer, and the thickness and extent of saturated alluvium in the Paradox Valley in western Colorado. This study was completed by the U.S. Geological Survey (USGS) in cooperation with the Bureau of Reclamation for modeling of brine discharge to the Dolores River (Heywood and others, 2024; Paschke and others, 2024). One point dataset and 11 surfaces (shapefiles or rasters) are published in this data release. The point dataset (Paradox_well_data.zip) contains water-level and geologic data for groundwater, observation, test, and production wells in the Paradox Valley compiled from several sources in 2010. Five of the surfaces (breccia_extent.zip, brsurface.zip, topbrcontour.zip, topsaltcontour.zip, and valley_alluvium.zip) were derived from published geologic maps and well logs and provide a hydrogeologic framework for the valley. The remaining six surfaces (alluvium_sat_bndy.zip, alluvium_sat_ci5m.zip, alt_wl_krig.zip, paa_sat.zip, wlalt_dwr_m.zip, and wlalt_ed_smooth.zip) were derived from the well dataset and mainly describe the thickness and extent of saturated alluvium in the valley floor. Details of how these geospatial datasets were created are provided in the 'process step' section of the metadata file associated with this data release. In addition to the geospatial datasets, this data release also includes a drilling report and results of several aquifer tests. The text file 'JensenBrineWell#2log.txt' contains the drilling report for Brine Well #2 from an unpublished report titled "Prospectus for Paradox Salt Company, Appendix F" by Jensen and Sorensen, Inc., 1959. The text file 'Specific_capacity_tests_pvu.txt' contains the results of 36 specific-capacity aquifer tests conducted by the Bureau of Reclamation between 1977 and 1984. The geospatial datasets in this data release were developed to support conceptual (Paschke and others, 2024) and numerical (Heywood and others, 2024) models of groundwater flow and brine discharge to the Dolores River in the Paradox Valley, Colorado. 1965 2010 observed Complete None planned -109.0092 -108.6408 38.4238 38.1937 ISO 19115 Topic Category geoscientificInformation USGS Thesaurus groundwater model Paradox Formation bedrock surface water-table surface saturated alluvium brine discharge USGS Metadata Identifier USGS:60e787ccd34e2a7685d131c1 Geographic Names Information System (GNIS) Colorado Montrose County Paradox Valley Dolores River 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. Suzanne Paschke U.S. Geological Survey, ROCKY MOUNTAIN REGION Supervisory Hydrologist mailing address

Mail Stop 415, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-6904 303-236-4912 spaschke@usgs.gov Cooperative funding for this project was provided by the Bureau of Reclamation Esri ArcMap software version 6.2, Build 9200 was used the produce the geospatial datasets Heywood, Charles Paschke, Suzanne S. Mast , M. Alisa Watts, Kenneth R. 2024 publication Scientific Investigations Report 2024-5038 Denver, Colorado U.S. Geological Survey https://doi.org/10.3133/sir20245038 Locations and altitudes of many water wells and of older abandoned oil-gas wells generally were reported to the center of 40-acre tracts and have maximum possible location errors of about 933 feet. When altitude of the land surface was not reported for a control point, the altitude was estimated using a 10-meter digital elevation model (USGS, 2021). Consequently, wells with poor location accuracy also have poor altitude accuracy. Because there is little recent groundwater-level data for the study area, except at the Paradox Valley Unit and the Piñon Ridge uranium-mill site, groundwater levels used in mapping the water-table surface included reported values from well-construction and test reports submitted to Colorado Division of Water Resources over a span of nearly 50 years. Consequently, groundwater-level measurements used in preparing this map are not contemporaneous, and the water-table surface and extent of the saturated alluvium are generalized. Bedrock contours were reviewed to verify that values accurately represented well-log data, were within the expected range, and were consistent with the available geologic maps. Water-level contours were reviewed to verify that values represented the water-level data, were within the expected range, and were consistent with the land-surface altitude. The extent of the saturated alluvium was reviewed to verify that it was consistent with published geologic maps, water-level data, topography, and areas of irrigated land in the valley. Dataset 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. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted. Altitude data referenced to the North American Vertical Datum of 1988 (NAVD88) Colorado Division of Water Resources and Colorado Water Conservation Board 2010 application/service https://cdss.colorado.gov/ Digital and/or Hardcopy 1965 2009 observed Colorado Division of Water Resources (2010) downloaded well permit, construction, and water-level data from the on-line database in 2010 Colorado Oil and Gas Conservation Commission 2010 application/service https://cogcc.state.co.us/#/home Digital and/or Hardcopy 2010 publication date Colorado Oil and Gas Conservation Commission (2010) oil and gas well data downloaded from the on-line database in 2010 Esri 2010 software https://www.esri.com/en-us/home Digital and/or Hardcopy 2010 2012 publication date Esri (2010) version 6.2 of the ArcGIS software was used over the life of the project U.S. Geological Survey 2010 application/service https://doi.org/10.5066/F7P55KJN Digital and/or Hardcopy 2010 publication date USGS (2010) downloaded water-level and well construction information from NWIS in 2010 Day, W.C. Green, G.N. Knepper, D.H., Jr. Phillips, R.C. 1999 publication Open-File Report OF-99-427 Denver, Colorado U.S. Geological Survey U.S. Geological Survey Open-File Report OF-99-427 https://doi.org/10.3133/ofr99427 Digital and/or Hardcopy 1999 publication date Day and others (1999) publication and spatial datasets downloaded from online database Bureau of Reclamation 2010 application/service website with links to online reports for the Paradox Valley Unit https://www.usbr.gov/uc/progact/paradox/index.html Digital and/or Hardcopy 1970 2010 publication date Bureau of Reclamation (2010) data and reports downloaded from this website Elston, D.P. Shoemaker, E.M. 1961 publication Oil and Gas Investigations Map OM-209 Denver, Colorado U.S. Geological Survey Oil and Gas Investigations Map OM-209 Map Scale: 1:250,000 https://ngmdb.usgs.gov/Prodesc/proddesc_5363.htm Digital and/or Hardcopy 1961 publication date Elston and Shoemaker (1961) hardcopy of map scanned then used for digitizing U.S. Geological Survey 2021 application/service https://elevation.nationalmap.gov/arcgis/rest/services/3DEPElevation/ImageServer Digital and/or Hardcopy 2010 publication date USGS (2021) DEM datasets obtained from USGS in 2010 Department of Energy, Office of Science 2010 publication https://www.energyfrontier.us/ Digital and/or Hardcopy 2010 publication date EFRC (2010) well data obtained from Zach Rogers of EFRC on March 30, 2010 and Kleinfelder of EFRC on June 9, 2009 Macmillan College Publishing Company, New York 1994 3rd Edition publication 691 p. Digital and/or Hardcopy 1994 publication date Fetter (1994) used equations for computing hydraulic conductivity based on specific capacity aquifer tests Compilation of well dataset: To compile the dataset Paradox_well_data.zip, well construction and test reports and locations for permitted wells were compiled from the Colorado Division of Water Resources on-line well-permit database (Colorado Division of Water Resources, 2010). Locations, drilling reports, and geophysical logs of oil and gas test wells in and near the Paradox Valley were retrieved from the Colorado Oil and Gas Information System (Colorado Oil and Gas Conservation Commission, 2010). Documents, reports, and data collected during planning, testing, and operation of the Paradox Valley Unit (PVU) were supplied by the Bureau of Reclamation (Bureau of Reclamation, 2010). Well-construction, groundwater levels, and water-quality data for groundwater sites in and near the study area also were retrieved from the USGS National Water Information System database (USGS, 2010). Altitude in feet referenced to the NAVD88 for the top of bedrock, top of salt, and bottom of the alluvium were computed based on the well-log information and added as attributes to the shapefile. Colorado Division of Water Resources (2010) Colorado Oil and Gas Conservation Commission (2010) USGS (2010) 2010 Steps in creating hydrogeologic datasets: The aerial extent of the alluvial cover on the floor of the Paradox Valley (valley_alluvium.zip) was prepared using the Esri ArcMap software version 6.2, Build 9200 (Esri, 2010). Spatial geologic data from Day and others (1999) was used to compile a polygon of bedrock formations surrounding the valley, which provided a mask for generating a new polygon representing the extent of alluvial cover on the floor of the Paradox Valley (valley_alluvium.zip). A raster representing the altitude of the top of bedrock (brsurface.zip) was created using the Alt_Br altitude points in Paradox_well_data.zip with the valley_alluvium.zip as a boundary. The raster was generated in ArcGIS using the 'Topo to Raster' tool in the Spatial Analyst package. The raster surface was contoured using the 'contour' tool in Spatial Analyst to create the contour map topbrcontour.zip. Some manual edits were made to the contours to match boundaries and honor data points. The surface breccia_extent.zip represents the extent of brecciated caprock under the alluvial aquifer adjacent to the Dolores River. The surface was delineated by extracting the 1,500-meter (4,920-foot) contour from topbrcontour.zip and converting the line to a polygon. The altitude of 1,500 meters was selected because well logs for many of the PVU production wells indicate the altitude at the top of the breccia is the range of 1,480 to 1,490 meters above NAVD88 (Bureau of Reclamation, 2010). The dataset topsaltcontour.zip is a structural contour map of the top of the salt in the Paradox Formation. It was digitized from a paper map by Elston and Shoemaker (1961) and recontoured to change the contour interval from 1,000 to 250 feet. Day and others (1999) Esri (2010) Elston and Shoemaker (1961) Bureau of Reclamation (2010) 2010 Steps in creating alluvial aquifer datasets: Colorado Division of Water Resources water-level data compiled in Paradox_well_data.zip were contoured using kriging in ArcMap to produce a contour map of the water-table surface (alt_wl_krig.zip). Some manual edits and smoothing were made to match boundaries and honor data points. Using ArcGIS tools in Spatial Analyst (Esri, 2010), the contour map was converted to a raster (wlalt_dwr_m.zip) representing the water-table altitude in meters NAVD88. The bedrock surface (brsurface.zip) was converted to meters then subtracted from the water-table surface using the raster calculator in ArcGIS to generate a raster representing the thickness of the saturated alluvium (paa_sat.zip). This surface was then contoured in ArcGIS to produce alluvium_sat_ci5m.zip, which is a contour map of the thickness of the saturated alluvium with 5-meter contours. The extent of the saturated alluvium (alluvial_sat_bndy.zip) was created by extracting the 0-meter contour from alluvium_sat_ci5m.zip, smoothing the line, and converting it to a polygon. The water-table surface was further refined by clipping it to the boundary of saturated alluvium (alluvial_sat_bndy.zip) and increasing the contour interval to 10 feet (3.05 meters) yielding the dataset wlalt_ed_smooth.zip. Esri (2010) 2010 Specific capacity aquifer tests: The Bureau of Reclamation conducted 36 specific capacity aquifer tests at 21 well sites between 1977 and 1984. The static water level (swl), final pumping water level (pwl), sustained yield (Q), length of test (t), and depth to bedrock for each test were obtained from the well permits, which are available from the Colorado Division of Water Resources (CODWR) on-line well-permit database (Colorado Division of Water Resources, 2010) using the CODWR permit number. The following properties were computed from the published test data based on equations from Fetter (1994): 1. Drawdown (s) in feet: s = pwl - swl 2. Specific capacity (Q/s) in cubic feet per day per foot of drawdown: Q/s = Q ÷ s * 1440 ÷ 7.48 3. Saturated thickness (bo) in feet: bo = depth to bedrock - swl 4. Corrected drawdown (s') in feet: s' = s - (s*s ÷ 2*bo) 5. Transmissivity derived from specific capacity (Tsc) in cubic feet per day per foot of drawdown: Tsc = Q ÷ s' * 1440 ÷ 7.48 6. Hydraulic conductivity derived from specific capacity (Ksc) in cubic feet per day per foot of drawdown per foot of saturated thickness: Ksc = Q ÷ s ÷ b Colorado Division of Water Resources (2010) Fetter (1994) 2010 Vector G-polygon 1 Universal Transverse Mercator 13 0.9996 -105.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North American Veritical Datum 1988 (NAVD88) GRS_1980 6378137.0 298.257222101 valley_alluvium.dbf The valley_alluvium.dbf file in valley_alluvium.zip folder contains attribute information associated with the valley_alluvium shapefile, which delineates the extent of alluvium on the floor of the Paradox Valley. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. Id Internal identification number Producer Defined Sequential unique whole numbers that are automatically generated. Paradox_well_data.dbf The Paradox_well_data.dbf file in the Paradox_well_data.zip folder contains data for groundwater wells compiled from several different sources and subsequently used to derive some of the surfaces presented in the data release. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. DATASOURCE Source of well information Producer Defined COGCC Colorado Oil and Gas Conservation Commission Producer defined DWR Colorado Division of Water Resources Producer defined EFRC Energy Frontier Research Centers, Producer defined USBR Bureau of Reclamation Producer defined SITEID Site identification of well Producer Defined Site identification of well from original data source PERMITNO Permit number from Colorado Division of Water Resources Producer Defined Permit number from Colorado Division of Water Resources. Empty cells indicating unavailable information. OID_ Site name Producer Defined Site name of well from original database. Empty cells indicating unavailable information. GEOPHYSLOG Geophysical Log available Producer Defined << empty cell >> not available Producer defined Y yes Producer defined SITETYPE Type of Well Producer Defined OG Oil and Gas Producer defined GW Groundwater Producer defined SITEUSE Primary site use Producer Defined TH test hole Producer defined W withdrawal Producer defined O observation Producer defined AB all beneficial uses Producer defined WATUSE Primary use of water Producer Defined U unused Producer defined D undefined use Producer defined HUO other use Producer defined MW monitoring well Producer defined S stock Producer defined DS domestic/stock Producer defined IS irrigation/stock Producer defined N industrial Producer defined BRINE Brine well for Paradox Valley Unit Producer defined TEST test well for Paradox Valley Unit Producer defined X easting coordinate in Universal Transverse Mercator (UTM), zone 13N, NAD83 Producer Defined 151506.8 186546.0 meters Y northing coordinate in UTM, zone 13N, NAD83 Producer Defined 4231025.0 4258652.0 meters XYSYSTEM coordinate system for X and Y data Producer Defined UTM83mZ13 Universal Transverse Mercator (UTM), zone 13N, NAD83 Producer defined ELEV Well elevation in feet, datum is in column 'ELEVDATUM' Producer Defined 0 unavailable Producer defined 4838.87 7246.0 feet ELEVREF Reference elevation Producer Defined << empty cell >> unavailable Producer defined Surface surface elevation Producer defined TOC top of contact elevation Producer defined ELEVDATUM Datum for elevation data Producer Defined << empty cell >> unavailable Producer defined NAVD88 North American Vertical Datum of 1988 (NAVD 88) Producer defined NGVD29 North American Vertical Datum of 1929 (NAVD 88) Producer defined XYSOURCE Source of coordinate information Producer Defined COGCC Colorado Oil and Gas Conservation Commission Producer defined CDWR Colorado Division of Water Resources Producer defined Kleinfelder 06/09/09 EFRC Producer defined EFRC, Zach Rogers, March 30, 2010 Energy Frontier Research Centers, contact information and date Producer defined USBR, shapefile Bureau of Reclamation shapefile Producer defined USBR DPR 1978 map Bureau of Reclamation Definite Plan Reports (DPR) Producer defined USBR DPR 1978 TRS Bureau of Reclamation Technical Reports Series (TRS) Producer defined A. Nicholas, 2010 Andrew Nicholas, Paradox Valley Unit Producer defined HOLE_DEPTH Total depth of well hole Producer Defined 0 unavailable Producer defined 48.1 9533.0 feet WELL_DEPTH Total depth of well in feet Producer Defined empty cell unavailable Producer defined 25.6 484.5 feet TOPPERF Top of perforation in feet Producer Defined empty cell unavailable Producer defined 0 459.6 feet BTMPERF Bottom of perforation in feet Producer Defined empty cell unavailable Producer defined 20 479 feet DWL Depth of water level below land surface, in feet Producer Defined empty cell unavailable Producer defined 6.66 379.43 feet DWL_YR Year of water-level measurement Producer Defined empty cell unavailable Producer defined Year of water-level measurement DWL_AQUIF Aquifer where water level measurement was made Producer Defined << empty cell >> unavailable Producer defined Bedrock Bedrock Producer defined Alluvial Alluvial Producer defined DBA Depth to bottom of alluvium in feet Producer Defined 0.0 176.0 feet DBALITH Lithology at bottom of alluvium Producer Defined empty cell not available Producer defined Lithology at bottom of alluvium DBR Depth at bedrock contact in feet Producer Defined 0.0 176.0 feet DBRLITH Lithology at bedrock contact Producer Defined empty cell not available Producer defined Lithology at bedrock contact DBRFM Formation at bedrock contact Producer Defined << empty cell >> unavailable Producer defined Kd Cretaceous Dakota Sandstone Producer defined Jm Jurassic Morrison Producer defined Ph? Pennsylvania Paradox, uncertain Producer defined TRc Triassic Chinle Producer defined Jw Jurassic Wingate Producer defined Ph Pennsylvanian Paradox Producer defined TRcm Triassic Producer defined PHp Pennsylvanian Hermosa Producer defined DPH Depth to top of Pennsylvanian Paradox Formation in feet Producer Defined 0.0 6815.0 feet DPHSALT Depth to top of salt in feet Producer Defined 0.0 8410.0 feet LSDALT land surface altitude in feet above NADV88 Producer Defined 4838.87 7246.0 feet RASTERVALU land surface altitude from digital elevation model in feet above NADV88 Producer Defined 4930.30517578 7219.33935547 feet alt_BA Altitude at bottom of alluvium in feet above NADV88 Producer Defined -99999.0 unavailable Producer defined 4769 5707.0 feet alt_BR Altitude at top of bedrock contact in feet above NADV88 Producer Defined 4769.0 7246.0 feet alt_PH Altitude at top of Pennsylvanian Paradox Formation in feet above NADV88 Producer Defined -99999.0 unavailable Producer defined -627 5454.0 feet alt_Salt Altitude at top of salt in feet above NADV88 Producer Defined -99999.0 unavailable Producer defined -1992 4371.0 feet alt_WL Altitude at top of water table in feet Producer Defined -99999.0 unavailable Producer defined 4832 6219.0 feet aquif_WL Aquifer at water-table level Producer Defined << empty cell >> unavailable Producer defined Bedrock Bedrock Producer defined Alluvial Alluvial Producer defined rmk_WL Remark associated with water level Producer Defined << empty cell >> unavailable Producer defined DRY well was dry Producer defined sat_BA Thickness of saturated alluvium in feet Producer Defined -99999.0 unavailable Producer defined 0 120.0 feet BRTYPE Bedrock type Producer Defined << empty cell >> unavailable Producer defined MZ Mesozoic Producer defined PH Pennsylvanian Hermosa Formation (also referred to as the Pennsylvanian Paradox Formation) Producer defined topbrcontour.dbf The topbrcontour.dbf file is in the topbrcontour.zip folder and contains attribute information associated with the topbrcontour shapefile, which is a contour map of the altitude in feet above NAVD88 at the top of the bedrock surface in the Paradox Valley. Producer Defined FID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. CONTOUR contour altitude of top of bedrock surface, interval is 50 feet above NAVD88 Producer Defined 4850 5750 feet brsurface.tif The raster brsurface.tif is in the brsurface.zip folder. The raster represents the altitude in feet above NAVD88 of the top of the bedrock surface in the Paradox Valley. Producer Defined Value Unique numeric values contained in each raster cell represent altitude at the top of bedrock surface in feet above NAVD88 Producer Defined 4803.14 6725.71 feet wlalt_dwr_m.tif The raster wlalt_dwr_m.tif is in the wlalt_dwr_m.zip directory. The raster represents the altitude in meters above NAVD88 of the water table in the center of the Paradox Valley. Because water levels included in the underlying dataset are from different time periods, the surface represents a generalize or estimated water table. Producer Defined Value Unique numeric values contained in each raster cell representing altitude of the water table in meters above NADV88 Producer Defined 1497.11 1714.82 meters alt_wl_krig.dbf The alt_wl_krig.dbf file in the alt_wl_krig.zip folder contains attribute information associated with the alt_wl_krig shapefile, which is a contour map of the altitude in feet above NAVD88 at the surface of the water table. Because water levels included in the underlying dataset are from different time periods, the surface represents a generalize or estimated water-table altitude. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. ID Internal identification number Producer Defined 1 23 CONTOUR 50 foot contour intervals representing generalized altitude at the surface of the water table in feet above NAVD88 Producer Defined 4900 5500 feet altwl_ed_smooth.dbf The altwl_ed_smooth.dbf file in the altwl_ed_smooth.zip folder contains attribute information associated with the altwl_ed_smooth shapefile, which is an edited and smoothed contour map of the altitude in feet above NAVD88 at the surface of the water table. Because water levels included in the underlying dataset are from different time periods, the surface represents a generalize or estimated water-table surface. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. ID Internal feature number Producer Defined Internal identification number CONTOUR contour interval of water table surface in saturated areas of the alluvial aquifer, in feet above NAVD88 Producer Defined 4930 5550 feet con_m contour interval of water table surface in saturated areas of the alluvial aquifer, in meters above NAVD88 Producer Defined 1502.67 1691.64 meters paa_sat.tif The raster paa_sat.tif in the paa_sat.zip folder represents the saturated thickness in meters of the alluvial aquifer in the Paradox Valley. Because water levels included in the underlying dataset are from different time periods, the surface represents a generalize or estimated saturated thickness and extent. Negative values are due to error and should be interpreted as zero. Producer Defined Value Unique numeric values contained in each raster cell represents the thickness of the saturated zone of the alluvial aquifer in meters. The values represent a generalize or estimated saturated thickness and extent. Producer Defined -1.08014 80.4224 meters 1 alluvium_sat_ci5m.dbf The alluvium_sat_ci5m.dbf file in the alluvium_sat_ci5m.zip folder contains attribute information associated with the alluvium_sat_ci5m shapefile, which represents 5-meter contours of the thickness of the saturated alluvium. Because water levels included in the underlying dataset are from different time periods, the surface represents a generalize or estimated saturated thickness and extend. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. OBJECTID Object identification number Producer Defined 1 173 ID identification number Producer Defined 0.0 157.0 CONTOUR 5-meter contour interval of the saturated alluvium thickness Producer Defined 0.0 45.0 meter 1 Shape_Leng Length of the contour in meters Producer Defined 80.0343612416 29030.2977506 meters alluvial_sat_bndy.dbf The alluvial_sat_bndy.dbf file located in the alluvial_sat_bndy.zip folder contains attribute information associated with the alluvial_sat_bndy shapefile, which represents the boundary of the saturated alluvium in the Paradox Valley. Because water levels used to the underlying dataset are from different time periods the polygon is a generalize or estimated extent. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. Id Sequential identification number Producer Defined 0 0 breccia_extent.dbf The breccia_extent.dbf file in the breccia_extent.zip folder contains attribute information associated with the breccia_extent shapefile, which represents the spatial extent of brecciated caprock in the vicinity of the Dolores River. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. OBJECTID Sequential object identifier Producer Defined 1 1 ID Sequential identification number Producer Defined 0 0 Shape_Leng Length of polygon perimeter in meters Producer Defined 14864.1256108 14864.1256108 meters Shape_Area Area of polygon in square meters Producer Defined 10354273.5552 10354273.5552 square meters sqkm Area of polygon in square kilometers Producer Defined 10.4 10.4 square kilometers sqmi Area of polygon in square miles Producer Defined 4.01544 4.01544 square miles topsaltcontour.dbf The topsaltcontour.dbf in the topsaltcontour.zip folder contains attribute information associated with the topsaltcontour shapefile, which is a structural contour map of the altitude in feet above NAVD88 of the top of the salt in the Pennsylvanian Paradox Formation. Producer Defined FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry Esri Coordinates defining the features. ID Sequential identification number Producer Defined 1 134 integer CONTOUR 250-foot contour interval of the altitude at the top of the salt in the Pennsylvanian Paradox Formation in feet above NAVD88 Producer Defined -1750 1500 feet JensenBrineWell#2log.txt text file containing the drilling report for Brine Well #2 transcribed from an unpublished report Producer Defined Specific_capacity_tests_pvu.txt tab delimited text file. Producer Defined Well number Well number Producer Defined Well number used by Bureau of Reclamation Aquifer type of aquifer tested Producer Defined 111ALVM Alluvial aquifer Producer defined Date of test Date of aquifer test in mm/dd/yyyy Producer Defined Date of aquifer test in mm/dd/yyyy Static water level (swl), in feet Static water level (swl), in feet Producer Defined 5.85 13.48 feet Final pumping water level (pwl), in feet Final pumping water level (pwl), in feet Producer Defined 15.06 40.83 feet Sustained yield (Q), in gallons per minute Sustained yield (Q), in gallons per minute Producer Defined 5.0 240.0 gallons per minute Length of test (t), in hours Length of test (t), in hours Producer Defined << empty cell >> No Data Producer defined 2 8 hours Drawdown (s), in feet Drawdown (s), in feet Producer Defined 5.21 33.17 feet Depth to bedrock, in feet Depth to bedrock, in feet Producer Defined 46.0 129.0 feet Specific capacity (Q/s), in cubic feet per day per foot of drawdown Specific capacity (Q/s), in cubic feet per day per foot of drawdown Producer Defined 40 3380 cubic feet per day per foot of drawdown Saturated thickness (bo), in feet Saturated thickness (bo), in feet Producer Defined 33.9 120.6 feet Corrected drawdown (s'), in feet Corrected drawdown (s'), in feet Producer Defined 5.0 27.1 feet Tsc, in cubic feet per day per foot of drawdown Transmissivity derived from specific capacity (Tsc), in cubic feet per day per foot of drawdown Producer Defined 50 3570 feet per day per foot of drawdown Ksc, in cubic feet per day per foot of drawdown per foot of saturated thickness Hydraulic conductivity derived from specific capacity (Ksc), in cubic feet per day per foot of drawdown per foot of saturated thickness Producer Defined 1 62 cubic feet per day per foot of drawdown per foot of saturated thickness CODWR permit number CODWR permit number Producer Defined Colorado Division of Water Resources (CODWR) permit number GS ScienceBase U.S. Geological Survey 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 for other purposes, nor on all computer systems ,, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Digital Data https://doi.org/10.5066/P9CJQDDU None 20240503 Suzanne Paschke U.S. Geological Survey, ROCKY MOUNTAIN REGION Supervisory Hydrologist mailing address

Mail Stop 415, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-6904 303-236-4912 spaschke@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998