Harte, P.T.; https://orcid.org/0000-0002-7718-1204 Blake, J.M.T.; https://orcid.org/0000-0003-4667-0096 Becher, K.D.; https://orcid.org/0000-0002-3947-0793 Thomas, J.V.; https://orcid.org/0000-0003-0903-9713 Stengel, V.G.; https://orcid.org/0000-0003-0481-3159 20180823 tabular digital data Pembroke, New Hampshire U.S. Geological Survey, New England Water Science Center Harte, P.T., Becher, K.D. Blake, J.M.T., Thomas, J.V., and Stengel, V.G., 2018, Water-Quality and Borehole Geophysical Data Associated with Uranium Background Concentrations at the Homestake Superfund Site near Milan, New Mexico: 2016 (ver. 1.2) https://doi.org/10.5066/F7CR5RJS Harte, P.T., Blake, J.M., and Becher, K.D. 20180630 https://pubs.er.usgs.gov/preview/ofr20181055 Pembroke, New Hampshire U.S. Geological Survey, New England Water Science Center https://pubs.er.usgs.gov/preview/ofr20181055 The datasets contained herein were collected as part of a cooperative U.S. Geological Survey (USGS) and U.S. Environmental Protection Agency (EPA) project entitled "Field Investigations to Help Support the Assessment of Background Concentrations for Uranium at the Homestake Mining Company, Superfund Site near Milan, New Mexico, July 2016." Groundwater samples were collected from pre-selected wells and analyzed for metals (including uranium), alkalinity, ammonia, common ions, nitrogen, gross alpha/beta, radium isotopes, Radon-22, uranium isotopes, stable isotopes, sulfur isotopes, nitrogen isotopes, helium-4, dissolved gases, tritium/helium-3, carbon-14 and chlorofluorocarbons. Groundwater samples were collected using micropurge, volumetric, and passive samplers. Seven different laboratories analyzed the samples; separate datasets containing the results from each laboratory are provided in this data release. Microsoft excel .xlsx, xml, and tab-delimited text files are included for most dataset. A subset of the files are in .csv format. This data release documents water-quality data collected in August-October 2016 to help characterize groundwater resources near Milan, New Mexico. Specifically, these data can be used to identify chemical signatures (also called geochemical fingerprinting) of groundwater in the alluvial and Chinle aquifers at and near the Homestake Mining Company Superfund Site near Milan. In addition to groundwater sampling, borehole geophysical data were collected on selected wells and are included in this data release. 20160808 20161009 ground condition In work As needed -107.88969 -107.836308 35.268274 35.210418 USGS Thesaurus carbon isotope analysis radiometric dating radium uranium None isotopes radchem USGS Metadata Identifier USGS:58dc3627e4b0ee37af29ee1f Geographic Names Information System (GNIS) Milan Cibola County New Mexico none 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. This database has been approved for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the database is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Philip T. Harte USGS mailing and physical

331 Commerce Way

Pembroke New Hampshire 03275 USA 803-750-6113 ptharte@usgs.gov Project was performed in cooperation with the U.S. Environmental Protection Agency. A spreadsheet was used to facilitate sample tracking by comparing sample names, dates, and times with sample IDs and analyses. Laboratory data attributes were verified by looking at laboratory reports and lab results were checked using a QA/QC process that included duplicates and blanks. The laboratory results were compared to reporting and method detection limits. Relative percent difference calculations were done on duplicate samples. Matrix spikes were conducted by spiking random samples of media for various analytical methods at a frequency of 1 sample per batch of 20. Results of these were checked to ensure there were no matrix effects. Laboratory standards were used by each laboratory and results were checked for percent recovery. Comparison of lab results to reporting and method detection limits was done to verify that no results are below the detection limits. 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. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. The project included data from 7 different laboratories. After the data were received, the data were verified and any transcription errors were fixed by comparing to field notes. All data were combined into a spreadsheet to streamline formatting. Blank columns were deleted and headings were edited to agree with data release formats. Once the data were cleaned up, they were exported into tab-delimited text files for the data release. The metadata was processed by Kent Becher and Johanna Blake over a period of time. 20170515 Samples were sent to the following laboratories: (1) RTI Laboratory for general chemistry and metals; (2) the EPA Region 6 Laboratory for uranium; (3) PACE Analytics for radiochemistry; (4) USGS Stable Isotopes lab for stable isotopes; (5) the University of Utah for dissolved gases, CFCs and tritium; (6) the USGS Groundwater Dating Lab for helium-4 analysis; and (7) the WHOI National Ocean Sciences Accelerator Mass Spectrometry Facility for carbon-14. 20170515 Groundwater samples were collected in October 2016 by volumetric sampling, micropurge pumping, and passive samplers (which were deployed in August 2016). Each sample was collected in bottles or copper tubing and preserved according to USGS sampling protocol (U.S. Geological Survey, Field Manual). Samples were kept on ice if necessary for preservation and shipped to the appropriate laboratory for analysis. Nineteen wells were sampled volumetrically between October 4, 2016 and October 8, 2016. Six wells had passive samplers deployed in August 2016 at varying depths described in the Well_field_data_parms.txt file. The samplers had a 120 micron screen size. These samplers were collected during the same October timeframe as the volumetric samples. The same six wells with passive samplers were sampled with a micropurge pump setting at variable depths in October 2016. 201610 Spatial data were used from public reports on the site. 1.0E-5 1.0E-5 Decimal degrees Unspecified datum as reported in site reports 1.0 feet Explicit elevation coordinate included with horizontal coordinates Well depth below land surface or measuring point 0.1 feet Attribute values RTI_General_Chem.txt, RTI_General_Chem.xlsx Data include inorganic groundwater data collected from selected wells at the site. RTI analyzed the samples and sent the data to the USGS. USGS verified data and formatted the data for release. SampID RTI Laboratory sample set ID number RTI Laboratory Internal sample identification assigned by RTI Laboratory ClientSampID USGS well ID followed by well name USGS project defined USGS defined well ID followed by well name DateCollected Date the sample was collected on site USGS Field Staff 10/4/2016 10/7/2016 mm/dd/yyyy TimeCollected Time sample was collected in military time (mountain time) USGS Field Staff 00:00 24:00 Time in military time Method Analytical method used by laboratory to analyze samples Project Quality Assurance Project Plan EPA analytical methods https://www.epa.gov/cwa-methods CAS Chemical abstract service, defines chemical substance information Division of the American Chemical Society CAS https://www.cas.org/ Analyte Name of specific analyte Project defined Inorganic chemistry results, Alkalinity-Total, Alkalinity Hydroxide(as CaCO3), Alkalinity Carbonate(as CaCO3), Alkalinity Bicarbonate(as CaCO3), Antimony, Antimony Dissolved, Arsenic, Arsenic Dissolved, Barium, Barium Dissolved, Bromide, Cadmium, Cadmium Dissolved, Calcium, Calcium Dissolved, Chloride, Chromium, Chromium Dissolved, Cobalt, Cobalt Dissolved, Copper, Copper Dissolved, Fluoride, Iron, Iron Dissolved, Lead, Lead Dissolved, Magnesium, Magnesium Dissolved, Manganese, Manganese Dissolved, Molybdenum, Molybdenum Dissolved, Nickel, Nickel Dissolved, Nitrogen Ammonia (as N) Dissolved, Nitrogen Nitrate-Nitrite Dissolved, Potassium, Potassium Dissolved, Selenium, Selenium Dissolved, Sodium, Sodium Dissolved, Sulfate, Tin, Tin Dissolved, Titanium, Titanium Dissolved, Total Dissolved Solids (Residue,Filtered), Vanadium, Vanadium Dissolved, Zinc, Zinc Dissolved : Domain cannot be represented Result Numerical value or ND=non detection (value is below method detection level) RTI Laboratory 0.0012 980,000 Variable units Units units of analytical measurement ug/L; micrograms per liter. mg/L milligrams per liter Standard metric units metric system metric system Qualifier Data qualifier, U, value is lower than method detection limit, J, the value is considered an estimate and is somewhere between laboratory reporting limit and method detection limit Producer defined Standard laboratory data qualifiers RTI laboratories MDL Method detection limit- detection limit established by standard method https://www.epa.gov/cwa-methods 0.0012 58,000 LOD limit of detection- the lowest detection limit for a set of analyses based on calibrations of the analytical equipment RTI Laboratories 0.0024 250,000 LOQ Limit of Quantitation (aka reporting limit) RTI Laboratories 0.10 10,000 Total or Dissolved T indicates the sample was not filtered in field, D indicates the sample was filtered through a .45 micron capsule filter USGS field staff. Field contains a T or a D to represent unfiltered or filtered. Pace-Radchem.txt, Pace-Radchem.xlsx All radchem collected from groundwater wells at site and analyzed by Pace Laboratories. Pace Laboratories. InternalID Sample identification assigned PACE Laboratory PACE Laboratory PACE Laboratory internal sample number Well_name Well names given to wells by Homestake and contractors Homestake Well names given to wells by Homestake and contractors ClientID USGS well ID and QA/QC identifier (if provided) USGS Field Team USGS well ID and QA/QC identifier (if provided) defined by the USGS Field Team SampleDate Date the sample was collected on site USGS Field Team 10/4/16 10/8/2016 Date in mm/dd/yyyy SampleTime Time sample was collected in military time (mountain time) USGS Field Team 00:00 24:00 Time in military time Isotope Isotope name Project defined Radon, Gross Alpha, Gross Beta, Uranium-234, Uranium-235, Uranium-238, Radium-226, Radium-228 Method This is the laboratory method used by PACE Laboratory for each constituent The EPA methods can be located at https://www.epa.gov/cwa-methods, HSL method is an internal PACE method, standard method 7500 is located at standardmethods.org/Store/ProductView.cfm?ProductID=370 standardmethods.org/Store/ProductView.cfm?ProductID=370, https://www.epa.gov/cwa-methods Result Numeric result by each isotope PACE Laboratory 0.063 8,853 pCi/L Uncertainty Safe drinking water act = 1.96 sigma count uncertainty, all other matrices = expanded uncertainty (955 confidence interval), Gamma Spec = Expanded Uncertainty (95.4% confidence level) PACE Laboratory 0.157 1,595 ReportUnits pCi/L picocuries per liter PACE laboratory Units are reported in pCi/L (picocuries per liter). RL Reporting level PACE Laboratory 0.063 106 pci/L MDC Minimum detectable concentration PACE Laboratory 0.063 106 pCi/L LabQualifier H, sample missed holding time PACE Laboratory Value is added if there is an issue with the sample or analysis. PACE Laboratory identified some samples that were analyzed after the defined holding time. CAS Chemical abstract service, defines chemical substance information Division of the American Chemical Society CAS https://www.cas.org/ Bench_test.txt, Bench_test.xlsx Data provides uranium and selenium concentrations for an equipment blank and bench test of passive sampler efficiency RTI Laboratory SampID SampleID provided by RTI Laboratory RTI laboratory defined The field contains lab provided sample identifiers ClientSampID USGS standard station location name based on latitude and longitude. Includes description of the sample USGS and producer defined Field contains a standard USGS latitude and longitude station ID as well as a sample description ProjectName USGS project name Producer defined Field contains project name DateCollected Date the sample was collected on site Producer defined Date in mm/dd/yyyy format TimeCollected Time sample was collected in military time (eastern time) Producer defined Time in military time DateReceived The date the laboratory received the sample Producer defined Date in mm/dd/yyyy AnalysisDate The date RTI laboratory analyzed the sample Producer defined Date in mm/dd/yyyy Method RTI laboratory method code; Based upon USEPA method code USEPA defined EPA Analytical methods https://www.epa.gov/cwa-methods CAS Chemical abstract service, defines chemical substance information Division of American Chemical Society CAS http://www.cas.org/ Analyte The analyte of selenium RTI laboratory definted Analyte name, selenium Result The concentration result from RTI laboratory. ND is non-detect. RTI laboratory defined 2.9 85,000 ug/L Units Units of concentration in ug/L RTI laboratory defined Concentration units of ug/L Qualifier Qualifier of data from RTI laboratory. J: Analyte concentration is reported, and is less than the practical quantitation limit (PQL) and greater than or equal to the established MDL. Greater uncertainty is associated with this result and data reported is estimated. These analytes are not routinely reviewed nor narrated as to their potential for being laboratory artifacts. RTI laboratory The field represents a qualified result based upon laboratory detection limits. MDL MDL: Method Detection Limit; The lowest concentration of analyte that can be detected by the method in the applicable matrix. RTI laboratory 1.3 6,700 ug/L LOD limit of detection- the lowest detection limit for a set of analyses based on calibrations of the analytical equipment RTI laboratory defined Values are assigned during analysis LOQ Limit of Quantitation (aka reporting limit) RTI laboratory defined Laboratory defined SampType Sample type defined by RTI laboratory RTI laboratory defined Text description of sample type defined by laboratory TotalOrDissolved Total (unfiltered) sample or dissolved (<0.45 um filter) sample. Producer defined T- Total (unfiltered), D-Dissolved (filtered) USGS_Stable_Isotopes.txt, USGS_Stable_Isotopes.xlsx Data for stable isotopes of water USGS Reston Stable Isotope Laboratory (RSIL) OurLabID RSIL lab ID RSIL produced Laboratory sample ID Field_ID USGS standard station location name based on latitude and longitude and includes sample date and time. USGS standard location and producer defined date and time StationID_Date_time Delta_2H_permil Delta 2Hydrogen per mil RSIL defined -84 -60 per mil Delta_18O_permil Delta 18 oxygen per mil RSIL defined -11 -7 per mil Lab_Schedule Lab schedule code for analytical constituents. Sch 1142 is a USGS schedule for both stable hydrogen isotopes (2H/1H) and stable oxygen isotopes (18O/16O) of water by mass spectrometer USGS defined Field describes analytical code. NWQL_Code National water quality laboratory code for type of sample. WG= groundwater; WGQ= groundwater replicate. Codes were checked by multiple team members. NWQL defined Codes relate to water type Station_Name Well name Producer defined Field contains well ID names Station_No USGS standard station location name based on latitude and longitude. USGS defined Field represents a station number based on latitude and longitude location of sample site. State_Code A two-digit ANSI code. Numerical value of state where samples were collected. 35= New Mexico American National Standards Institute American National Standards Institute (ANSI) Codes for States https://www.census.gov/geo/reference/ansi_statetables.html Collection_Date-Time_(Start) The date and start time of sample collection Producer defined Date and time of sample collection. Sample_Type A numerical value for sample type based on defined values from the National Water Quality Laboratory (NWQL). 9= regular sample; 7= replicate sample NWQL defined Sample Type Code https://help.waterdata.usgs.gov/codes-and-parameters USGS_Sulfur_isotopes.txt, USGS_Sulfur_isotopes.xlsx Sulfur isotope results USGS Reston Stable Isotope Laboratory (RSIL) OurLabID Reston Stable Isotope Laboratory (RSIL) lab ID Laboratory defined Laboratory sample ID USGS_Site_ID USGS standard station location name based on latitude and longitude USGS defined. Value is a site ID based upon latitude and longitude of sample location Sample_date Date the sample was collected on site Producer defined Date of sample collection Sample_Time Time sample was collected in military time (mountain time) Producer defined. Time in military time Well_ID Name of well. Producer defined. Name of well Delta_34S_permil Delta 34 Sulfur value in per mil RSIL defined -32 7 per mil Mass_Fraction_S Percent or fraction of the total mass analyzed that is sulfur RSIL defined 13 14 percent (%) Delta_18O_permil Delta 18 oxygen value in per mil RSIL defined 2 11 per mil Mass_Fraction_O Percent or fraction of the total mass analyzed that is oxygen RSIL defined 26 28 percent (%) District_Code Code for USGS district USGS defined State name https://www.census.gov/geo/reference/ansi_statetables.html Lab_Schedule Lab schedule code for analytical constituents. Lab schedule code for analytical constituents. Sch 1951 is a USGS schedule for Stable sulfur isotopes (34S/32S) of dissolved sulfate in water at concentrations of > 20 mg/L by mass spectrometer. USGS defined. Lab analytical code. NWQL_Code Sample medium type where WG= groundwater; WGQ= groundwater replicate USGS Defined Sample Medium Code https://help.waterdata.usgs.gov/codes-and-parameters State_Code Two-digit ANSI number for state of New Mexico American National Standards Institute (ANSI) Codes for States American National Standards Institute (ANSI) Codes for States https://www.census.gov/geo/reference/ansi_statetables.html Sample_Type A numerical value for sample type based on defined values from the National Water Quality Laboratory (NWQL). 9= regular sample; 7= replicate sample USGS defined Sample Type https://help.waterdata.usgs.gov/codes-and-parameters USGS_Nitrogen_Isotopes.txt, USGS_Nitrogen_Isotopes.xlsx Nitrogen isotope data USGS Reston Stable Isotope Laboratory (RSIL) OurLabID RSIL sample ID. RSIL defined Lab identifiers from RSIL. Field_ID A combination of USGS standard station location name based on latitude and longitude and date and time of sample collection. USGS and Producer defined Station ID, date, and time Delta_15N_permil Delta 15 Nitrogen data in per mil. Non-detect (ND) RSIL defined 8.26 33 per mil Delta_15N_Comment Comment on Delta 15N results. In this case, 'o,' means that the nitrate concentration was below detection to analyze for Nitrogen stable isotopes. RSIL defined. Code defined by RSIL Delta_18O_permil Delta 18 oxygen value in per mil RSIL produced -0.03 16 per mil Delta_18O_Comment Comment on Delta 18O results. In this case, 'o,' means that the nitrate concentration was below detection to analyze for Oxygen stable isotopes. RSIL defined. RSIL defined code District_Code Two letter district code, which is the State abbreviation for New Mexico USGS Defined from FIPS State code FIPS state code https://www.census.gov/geo/reference/ansi_statetables.html Lab_Schedule Lab schedule code that defines the requested analysis. Lab schedule code for analytical constituents. SLC 2900 is a USGS schedule for both stable nitrogen isotopes (15N/14N) and stable oxygen isotopes (18O/16O) of dissolved nitrate in water by mass spectrometer USGS defined. USGS defined laboratory analysis schedule NWQL_Code USGS Sample medium type; In this case, WG= groundwater, WGQ= Groundwater replicate. USGS defined Sample medium type https://help.waterdata.usgs.gov/codes-and-parameters Well_ID Name of well. Producer defined Specific name of well Station_No USGS standard station location name based on latitude and longitude. USGS defined Specific value based upon site location latitude and longitude State_Code Two-digit ANSI code for state American National Standards Institute (ANSI) Codes for States American National Standards Institute (ANSI) Codes for States https://www.census.gov/geo/reference/ansi_statetables.html Collection_Date-Time_(Start) Date and time (military) of sample collection (mountain time). Producer defined Date and time Sample_Type USGS defined code for type of sample where 9=regular and 7=replicate. USGS defined Sample type https://help.waterdata.usgs.gov/codes-and-parameters USGS_He-4.txt, USGS_He-4.xlsx Helium-4 results. The last three rows for the last 4 columns are empty because these columns are specific to each other related to temperature. USGS Reston Groundwater Dating Laboratory (RGDL) Name Well ID for sample Producer defined. Specific well ID Site_ID USGS standard station location name based on latitude and longitude. USGS defined Site ID based upon sample location latitude and longitude. Date Date the sample was collected on site Producer defined. Date in mm/dd/yyyy format. Time Time sample was collected in military time (mountain time) Prodcer defined Time in military time (He)_NanoMol/kg_in_H20 Helium concentration in nano mol per kilogram in water RGDL defined 3 600 nanoMol/kg in water (H2)_NanoMol/kg_in_H20 H2 concentration in nano mol per kilogram in water RGDL defined 0 1.13 nanoMol/kg in water (Ne)_NanoMol/kg_in_H20 Ne concentration in nano mol per kilogram in water RGDL defined 7.9 16.7 nanoMol/kg in water (He)_cc/g_of_H2O_at_STP_x109 He concentration in cc/g of water at standard temperature and pressure times 109 RGDL defined 77 13318 cc/g of water at standard temperature and pressure times 109 (H2)_cc/g_of_H2O_at_STP_x109 H2 concentration as cc/g of water at standard temperature and pressure times 109 RGDL defined 0 25 cc/g of water at standard temperature and pressure times 109 (Ne)_cc/g_of_H2O_at_STP_x109 Ne concentration in units of cc/g of water at standard temperature and pressure times 109 RGDL defined. 177 374 cc/g of water at standard temperature and pressure times 109 Equilibrium_concentration_of_gas_ with_water_Temperature_oC Temperature range for equilibrium concentrations of gases with water The last three rows for the last 4 columns are empty because these columns are specific to each other related to temperature. RGDL defined 0 30 degrees celcius Equilibrium_concentration_of_gas_ with_water_(He)_nanoMol/kg He concentrations at varying temperatures. he last three rows for the last 4 columns are empty because these columns are specific to each other related to temperature. RGDL defined 2.02 2.20 nanoMol/kg Equilibrium_concentration_of_gas_ with_water_(H2)_nanoMol/kg H2 concentrations at varying temperatures. The last three rows for the last 4 columns are empty because these columns are specific to each other related to temperature. RGDL defined 0.38 0.49 nanoMol/kg Equilibrium_concentration_of_gas_ with_water_(Ne)_nanoMol/kg Ne concentrations at varying temperatures. The last three rows for the last 4 columns are empty because these columns are specific to each other related to temperature. RGDL defined 8.02 10.12 nanoMol/kg Well_field_data_parms.txt, Well_field_data_parms.xlsx Detailed information about well location, well construction, aquifer, sample dates and times, field parameters, and water levels. Blank cells indicate that no data were collected. The well labeled 'injectate' is the water being re-injected at the site. There is no well depth or purging time associated with the 'injectate' site. USGS and producer defined Station_number USGS standard station location name based on latitude and longitude. USGS defined Station number based on latitude and longitude of well location Well_name Name of well based upon Homestake names Producer defined Names of wells based upon Homestake names Date Date the sample was collected on site Producer defined Date in yyyymmdd format TimeCollected Time sample was collected in military time (mountain time) Producer defined 0000 2400 Time in military time Sample_time_datum Time datum of sample collection time in mountain daylight savings time (MDT) Producer defined Mountain daylight savings time Collecting_agency Agency that collected the samples; In this case, USGS collected all samples USGS defined Agency that collected the samples Sample_collection Sample collection method. Volumetric= pumping 3 well volumes of water prior to sampling, Passive= deployment of passive sampling bottles, Micropurge= slow purge rate and small volume withdrawn. Producer defined Type of sample collection method Passive_start_date Date that passive sampler was deployed. NA indicates that the sample was collected by micorpurge or volumetrically. Producer defined Date in yyyymmdd format Passive_start_time Time of day that passive samplers were deployed in military time format in Mountain Time. NA indicates that the sample was collected by micorpurge or volumetrically. Producer defined 0000 2400 Time in military time Passive_end_date Date of collection of passive sampler samples. NA indicates that the sample was collected by micorpurge or volumetrically. Producer defined Date of passive sample collection in yyyymmdd format Passive_end_time Time of day of collection of passive samplers in military time in Mountain Time. NA indicates that the sample was collected by micorpurge or volumetrically. Producer defined 0000 2400 Time in military time Horizontal_datum Geographic Information System horizontal datum USGS defined Reference datum for horizontal spatial projection, NAD83. Hydrologic_unit_code A 12-digit number showing the hydrologic unit where the sample is located. USGS defined 12-digit HUC https://water.usgs.gov/GIS/huc.html Latitude_dec_deg Latitude in decimal degrees USGS defined. Latitude in decimal degrees Longitude_dec_deg Longitude in decimal degrees USGS defined Longitude in decimal degrees Local_identifier The information includes township, range, section, and the well name. USGS defined Local name. Medium_name Type of sample medium. Producer defined Type of sample; In this case, groundwater. Aquifer Aquifer name, https://ngmdb.usgs.gov/Geolex/search Producer defined Name of geologic aquifer unit Elev_ft_above_datum Elevation of well at land surface above mean sea level (msl) Producer defined Well elevation in feet above msl. Range from 6553 feet to 6625 feet. NWIS_Record_number Number specific to sample location, date, and time. Helpful if you need to contact the NM Water Science Center for more information about the sample. USGS defined. USGS defined based upon number of samples in a database Field_comment Comments provided by field team for more details of the sample collection. Passive sampler and micropurge depths are listed. NA indicates that the sampler was collected volumetrically. Producer defined Notes provided by the field team Site_type_code Code for the type of site or sample being collected, GW means groundwater, FA-WIW means waste injectate USGS defined Sample medium type https://help.waterdata.usgs.gov/code/medium_cd_query?fmt=html Site_type Name that corresponds to the site type code USGS defined Medium name https://help.waterdata.usgs.gov/code/medium_cd_query?fmt=html Sample_type Sample type code such as regular, replicate, or blank USGS defined Sample type codes https://help.waterdata.usgs.gov/codes-and-parameters Altitude_datum Datum of altitude of well NOAA's National Geodetic Survey (NGS) Unspecified datum Air_temperature_degrees_celcius Temperature of air at time of sampling. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 18.3 18.3 degrees celcius Depth_to_water_level_feet_below _land_surface Depth to the water surface in feet below the land surface measured by electric tape. NA indicates that the depth to water is unknown. Producer Depth in feet Dissolved_oxygen_value_qualifier Qualifier for dissolved oxygen data. In this column, < means below a detection limit of 1 mg/L Probe manufacturer defined < symbol stands for less than a detection limit of 1 mg/L Dissolved_oxygen_water_Sonde_unfiltered_milligrams_per_liter Dissolved oxygen concentration with dissolved oxygen sonde. Concentrations are reported in mg/L. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 1 14.5 mg/L pH_value_qualifier Qualifier of pH data; In this case, E means that the probe may not have been functioning properly Producer defined E means that the probe may not have been functioning properly pH_water_unfiltered_field_standard_units pH value measured in the field on unfiltered samples. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 5.3 8.5 pH units Specific_conductance_water_unfiltered_microsiemens_per_centimeter_at_25_degrees_Celsius Specific conductance measured in the field on unfiltered water. Units are uS/cm at 25 degrees C. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 729 10300 uS/cm Temperature_water_degrees_Celsius Water temperature measured in degrees Celsius. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 12.7 15.8 degrees C Turbidity_water_nephelometric_turbidity_units_(NTU) Turbidity of water in NTU. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 0.3 2.2 NTU Altitude_of_land_surface_feet Altitude of the land surface a the well location Producer defined Altitude in feet Depth_of_well_feet_below_land_surface_datum Total depth of well below the land surface altitude in feet. Not measured indicates that it was not possible to measure this information. Producer defined Depth of well in feet Sampling_depth_blsd Depth of water sample in well. In depth below land surface datum in feet. Not measured indicates that it was not possible to measure this information. Producer defined Depth in feet Screened_Interval_(ft) The range of depth below land surface datum of the screened interval of the well. Depths are provided in feet. NA means not-applicable, or not measured. Producer defined Range of depths provided in feet Length_of_Screen_(ft) The length of the screened interval in the well. Length is provided in feet. Not measured indicates that it was not possible to measure this information. Producer defined Length of screened interval is provided in feet MP_abv_LSD_ft The measuring point on the well casing above the land surface datum. Measuring point is provided in feet. NA means not-applicable as is the case with four of the wells. These wells did not have MP values. Producer defined Measuring point is provided in feet Pump_rate_gal/min The rate of pumping in gallons per minute. NA indicates that the sample is from a passive sampler and no pumping occurred. Producer defined The pumping rate for the duration of purging and sampling. Pumping_duration_min The length of time in minutes that pumping occurred prior to sampling. NA means not-applicable, or not measured. Producer defined Number of minutes of pumping prior to groundwater sampling. WL_during_pump_blw_MP_ft The water level, or depth to water, during pumping below the measuring point. This depth is provided in feet. NA indicates that the sample is from a passive sampler and no pumping occurred. Producer defined Depth to water below the measuring point (in feet) during pumping. Ferrous_iron_data_qualifier Qualifier for ferrous iron data results. In this case, < means that data are below the method detection level of 0.2 mg/L. Producer defined Results are either blank or < Ferrous_iron_mg/L Results of ferrous iron measurements in mg/L. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 0.2 0.2 (which is the method detection level) mg/L Sulfide_data_qualifier Qualifier for sulfide data results; In this case, < means that data are below the method detection level of 0.05 mg/L. Producer defined. Values are either blank or < Sulfide_mg/L Sulfide concentrations in mg/L. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 0.05 0.05 (which is the method detection level) mg/L EH_mv Measurement of eH, a redox parameter, in millivolts. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined Values are in millivolts dissolved_oxygen_kit_data_qualifier Qualifier for dissolved oxygen kit. Method detection limit is 1 mg/L. < qualifies the result in the next cell. Producer defined field is blank or < Dissolved _oxygen_field_kit_mg/L Results of dissolved oxygen concentration from field kit in mg/L. The method detection limit is 1 mg/L. Not measured indicates that the particular sample was not analyzed for this parameter. Producer defined 1 5.5 mg/L Pump_type The type of pump used for sampling. NA means not-applicable, in cases where the pump is from the mill company. Producer defined No pump was used for passive samplers Sampler_material The type of material used in sampling mechanisms. NA means not-applicable, in cases where the sampler material is from the mill company. Producer defined Typically stainless steel or a poly bottle in the case of the passive sampling. Tubing_material The type of tubing material used during pumping and sampling. NA means not-applicable, in cases where the tubing is from the mill company. Producer defined typically teflon, poly, or copper Filter_type the type of filter used for filtered samples. Producer defined All filters were 0.45um capsule filters. Well_casing_material The type of material the well casing is made of. NA means not-applicable, in cases where the well casing material is from the mill company. Producer defined All known well casing types are PVC Casing/well_diameter_in The diameter of the well casing in inches. Producer defined The diameter of the well casing in inches DissolvedGasesTritium.txt, DissolvedGasesTritium.xlsx Results of dissolved gas and tritium analyses including calculated age and calculated parameters University of Utah Dissolved and Noble Gas Laboratory Sample_ID The sample ID as defined by USGS. Includes replicate samples USGS defined Well identifiers University_of_Utah_lab_ID Sample ID for University of Utah database University of Utah Laboratory defined Numerical ID defined by the University of Utah Laboratory for their database. Dissolved_Gas_Collection_Date Date the sample was collected on site. USGS project team defined Date in mm/dd/yyyy Ar_total_(ccSTP/g) Concentration of argon at standard temperature and pressure (STP) units are in ccSTP/g University of Utah Dissolved and Noble Gas Lab defined. 2.05E-04 9.47E-04 ccSTP/g Ne_total_(ccSTP/g) Concentration of neon at standard temperature and pressure (STP) units are in ccSTP/g University of Utah Dissolved and Noble Gas Lab defined. 1.17E-07 1.26E-06 ccSTP/g Kr_total_(ccSTP/g) Concentration of krypton at standard temperature and pressure (STP) units are in ccSTP/g University of Utah Dissolved and Noble Gas Lab defined 7.26E-08 1.55E-07 ccSTP/g Xe_total_(ccSTP/g) Concentration of xenon at standard temperature and pressure (STP) units are in ccSTP/g University of Utah Dissolved and Noble Gas Lab defined 6.63E-09 1.69E-08 ccSTP/g He4_(ccSTP/g) Concentration of helium 4 at standard temperature and pressure (STP) units are in ccSTP/g University of Utah Dissolved and Noble Gas Lab defined 4.01E-08 4.18E-06 ccSTP/g R/Ra The ratio of He3/He4 (R) measured in the sample and the present-day atmospheric He3/He4 ratio (Ra) University of Utah Dissolved and Noble Gas Lab defined 0.224 1.485 Measured_Tritium_(TU) The measured tritium value in sample. University of Utah Dissolved and Noble Gas Lab defined - where '-' means no data 5.75 TU TU_1-sigma_error(+/-) The 1 sigma error of TU measurement University of Utah Dissolved and Noble Gas Lab defined - where '-' means no data 0.23 Calculated_Age(yr)_Ne_only_model The calculated age of water in years based on the Ne only model. '-' means no data, * means not reporting; poor fit University of Utah Dissolved and Noble Gas Lab defined Calculated age in years based upon Ne model Ne_only_(1-sigma_error_+/-) One sigma error of calculated age based upon Ne only model. '-' means no data, * means not reporting; poor fit, '+' means age error not calculated -monte carlo method not possible University of Utah Dissolved and Noble Gas Lab defined. The field shows the one sigma error of calculated age Calculated_Age(yr)_EA_model Calculated age of water in years using an EA model. '-' means no data, * means not reporting; poor fit University of Utah Dissolved and Noble Gas Lab defined Calculated age of water in years based upon EA model EA_model_(1-sigma_error_+/-) One sigma error of age in EA model. '-' means no data, * means not reporting; poor fit, '+' means age error not calculated -monte carlo method not possible University of Utah Dissolved and Noble Gas Lab defined. One sigma error of calculated age in years Tritiogenic_He3-Ne_only_model_(TU) Tritiogenic He3 values used for the Ne only model (TU) University of Utah Dissolved and Noble Gas Lab defined. Tritiogenic He3 values used for the Ne only model (TU) Tritiogenic_He3-EA_model_(TU) Tritiogenic He3 values used for the EA model (TU) University of Utah Dissolved and Noble Gas Lab defined. Tritiogenic He3 values used for the EA model (TU) Calculated_Recharge_Temp_celsius Recharge temperature used in calculating age. '-' means no data University of Utah Dissolved and Noble Gas Lab defined. -, which means no data 14.6 degrees celcius Gas_Fractionation_(F)_(%) Percentage of gas fractionation. '-' means no data University of Utah Dissolved and Noble Gas Lab defined -, which means no data 0.9 % Excess_Air_(ccSTP/g) Excess air in ccSTP/g. '-' means no data University of Utah Dissolved and Noble Gas Lab defined -, which means no data 0.14 ccSTP/g Chi_squared Chi square of model fit University of Utah Dissolved and Noble Gas Lab defined Chi^ square of model fit Delta_Ne_percent The percent change of neon University of Utah Dissolved and Noble Gas Lab defined The percent change of neon Recharge_Elevation_(m) The elevation of recharge used in the model calculations. 2,000 meters University of Utah Dissolved and Noble Gas Lab defined All samples are set at 2,000m R-terrigenic The terrigenic He3/He4 value. University of Utah Dissolved and Noble Gas Lab defined All samples have R-terrigenic defined as 2.88E-08 NOTES Laboratory notes on status of model and goodness of fit. University of Utah Dissolved and Noble Gas Lab defined Laboratory notes on status of model and goodness of fit CFCdata&results.txt, CFCdata&results.xlsx CFC raw data and calculated results of recharge year of groundwater University of Utah Dissolved and Noble Gas Lab defined SAMPLE_ID ID of sample location, name of well. USGS project team defined USGS project team defined CFC-11_(pmoles/kg) Concentration of CFC-11 in pmoles/kg University of Utah Dissolved and Noble Gas Lab defined. Concentration of CFC-11 in pmoles/kg CFC-12_(pmoles/kg) Concentration of CFC-12 in pmoles/kg University of Utah Dissolved and Noble Gas Lab defined Concentration of CFC-12 in pmoles/kg CFC-113_(pmoles/kg) Concentration of CFC-113 in pmoles/kg University of Utah Dissolved and Noble Gas Lab defined Concentration of CFC-113 in pmoles/kg Salinity_(permil) Salinity of water per mil. University of Utah Dissolved and Noble Gas Lab defined. University of Utah Dissolved and Noble Gas Lab defined Recharge_Elevation._(m) Elevation of recharge to groundwater in meters University of Utah Dissolved and Noble Gas Lab defined Recharge elevation in meters Recharge_Temp_(C) Temperature of recharge in degrees C University of Utah Dissolved and Noble Gas Lab defined Recharge temperature in degrees C Pwater Water factor in equation for recharge year University of Utah Dissolved and Noble Gas Lab defined 0.006 0.0121 Elevation_correction Correction based on elevation University of Utah Dissolved and Noble Gas Lab defined Correction for calculations based on elevation KRT_11 Exponent for 11 calculations University of Utah Dissolved and Noble Gas Lab defined 0.00653 0.01263 KRT_12 Exponent for 12 calculations University of Utah Dissolved and Noble Gas Lab defined 0.00548 0.00942 KRT_113 Exponent for 113 calculations University of Utah Dissolved and Noble Gas Lab defined 0.02113 0.03871 eq._air_conc_11_(ppt) Equilibrium Concentration of Air with CFC 11 in ppt University of Utah Dissolved and Noble Gas Lab defined 0 123 ppt eq._air_conc_12_(ppt) Equilibrium Concentration of Air with CFC 12 in ppt University of Utah Dissolved and Noble Gas Lab defined 0 338 ppt eq._air_conc_113_(ppt) Equilibrium Concentration of Air with CFC 113 in ppt University of Utah Dissolved and Noble Gas Lab defined 0 47.5 ppt CFC-11_Recharge_ year Recharge year calculated from CFC 11 data University of Utah Dissolved and Noble Gas Lab defined Calculated years CFC-12_Recharge_year Recharge year of groundwater calculated from CFC-12 data. Some datasets did not have information to calculate a year in this attribute. These are labeled as #N/A. University of Utah Dissolved and Noble Gas Lab defined. Calculated years CFC-113_Recharge_year Recharge year of groundwater based upon CFC-113 data University of Utah Dissolved and Noble Gas Lab defined Calculated years EPA-uranium.txt, EPA-uranium.xlsx Uranium concentrations from the EPA Region 6 laboratory for volumetric samples. EPA Region 6 Laboratory SampID The laboratory defined sample identification. Producer defined. Laboratory defined sample identification. ClientSampID The USGS defined sample identification. Producer defined. The USGS defined sample identification. DateCollected Date the sample was collected on site USGS Field Staff 10/04/2016 10/07/2016 mm/dd/yyyy TimeCollected Time sample was collected in military time (mountain time) USGS Field Staff 00:00 24:00 Time in military time. DateReceived The date the laboratory received the sample for analysis. Producer defined. 5/4/2017 5/4/2017 mm/dd/yyyy AnalysisDate The date of sample analysis at the laboratory Producer defined 5/10/2017 5/10/2017 mm/dd/yyyy Method CLP ILMO5.3 - ICP/MS he EPA multi-media, multi-concentration, inorganic analytical service for Superfund. CLP= Contract Laboratory Program. ICP/MS= Inductively Coupled Plasma/Mass Spectrometry Producer defined. CLP ILMO5.3 - ICP/MS he EPA multi-media, multi-concentration, inorganic analytical service for Superfund. CLP= Contract Laboratory Program. ICP/MS= Inductively Coupled Plasma/Mass Spectrometry Analyte The analyte measured. This file is entirely uranium. Producer defined. The analyte uranium was measured on these samples. Result The concentration of uranium reported in each sample. U=undetected Laboratory defined. 1 427 Uranium concentrations were measured in micrograms per liter (ug/L) Units The unit of concentration reported. In this file, all concentrations are reported in micrograms per liter (ug/L). Laboratory defined. The unit of concentration reported. In this file, all concentrations are reported in micrograms per liter (ug/L). Qualifier HTS= Sample was prepared and/or analyzed past recommended holding time. Concentrations should be onsidered minimum values. Laboratory defined. HTS= Sample was prepared and/or analyzed past recommended holding time. Concentrations should be onsidered minimum values. LOQ Limit of quantification, which is 1 ug/L for uranium. Laboratory defined. 1 1 Uranium concentrations were measured in micrograms per liter (ug/L). TotalOrDissolved T indicates the sample was not filtered in field, D indicates the sample was filtered through a .45 micron capsule filter USGS Field Staff T indicates the sample was not filtered in field, D indicates the sample was filtered through a .45 micron capsule filter C14.txt, C14.xlsx Carbon-14 values WHOI National Ocean Sciences Accelerator Mass Spectrometry Facility LabID The WHOI laboratory defined identification. Producer defined. The WHOI laboratory defined identification. DateReported The date the analysis was reported Producer defined. 7/25/2017 7/25/2017 mm/dd/yyyy SubmitterIdentification The USGS defined well ID and the USGS Field Staff well name. USGS The USGS defined well ID and the USGS Field Staff well name. Type The type of analysis done to find the carbon-14 value. Producer defined. DIC= dissolved inorganic carbon. Process The process used by the lab to analyze the water for carbon-14. In this case the process was water strip, which is stripping of CO2 from the water. Producer defined. WS= water strip. The process used by the lab to analyze the water for carbon-14. In this case the process was water strip, which is stripping of CO2 from the water. F_modern Fraction modern is a measurement of the deviation of a samples radiocarbon content from that of the modern standard. The Fraction Modern reported requires no further correction for fractionation. Stable isotope delta13C results reported in this data should not be used to post correct. Producer defined. 0.4041 0.7271 fraction Fm_Err Fm_Err= The fraction modern error. Producer defined. 0.0011 0.0015 fraction Delta13C_Corr The isotope fractionation correction. * The asterisks indicate that the radiocarbon result was corrected for isotopic fractionation using unreported d13C values measured on the accelerator. Producer defined. * The asterisks indicate that the radiocarbon result was corrected for isotopic fractionation using unreported d13C values measured on the accelerator. Age The carbon-14 amount. The data need to be put in a model to account for dead carbon. Producer defined. 2560 7280 years Age_Err The error of the carbon-14 amount. Producer defined. 15 25 years Delta13C Delta 13 Carbon is the Carbon 13 to Carbon 12 ratio measured by Accelerator Mass Spectrometry (AMS). This value is used to correct for fractionation when calculating the age. Producer defined. -7.94 -2.94 Delta13C is a ratio of Carbon 13 to Carbon 12. Delta13C_Source The source of the Delta13C value. In this case, the WHOI laboratory measured the Delta13C. Producer defined. Measured by WHOI DIC_Conc(mmol/kg) The concentration of dissolved inorganic carbon in units of millimol per kilogram. Producer defined. 2.74 5 mmol/kg pem18-0007_table01_sep11_18_SB.csv Table of well data that contains both reported information from site reports and measured values from USGS Field Staff. Author defined. Local Well Name Name of wells as assigned by site reports. Homestake Mining Co. defined. Names of wells not represented by a domain. Northern Coordinate New Mexico East State Planar value, in feet. Homestake Mining. Co. defined Northern state plane coordinate that varies with each well. Eastern Coordinate New Mexico East State Planar value, in feet Homestake Mining. Co. defined Eastern state plane coordinate that variesss with each well. General location relative to tailings pile . Descriptive location relative to the large tailings pile. Producer defined. Location description that cannot be represented by a domain. Geologic formation Formation coincident with screen interval. Homestake Mining Co. defined Geologic formation names not defined by a domain. Well depth below MP (feet) Depth of well below measurement point in feet as reported in site reports. Homestake Mining Co. defined Depth values vary with well, and cannot be represented by a domain. Casing diameter (in) Diameter of well in inches as reported in site reports. Homestake Mining Co. defined Diameter variesss by well, and cannot be represented by a domain. Date of installation Date well was installed. Homestake Mining Co. defined Reported date of well installation variesss and cannot be represented by a domain. Depth of water level from measurement point, in feet Reported water level depth from measurement point, in feet as reported in site reports. Homestake Mining Co. defined Depth in feet of water variesss by well and cannot be represented by a domain. MP in feet above land surface datum Distance of stickup of well casing above land surface (als), in feet as reported in site reports. Homestake Mining CO. defined Stickup in feet of casing above land surface (als) variesss by well and cannot be represented by a domain. MP elevation in feet above MSL datum Elevation of well casing measurement point above mean sea level datum, in feet as reported in site reports. Homestake Mining Co. defined Elevation variesss by well and cannot be represented by a domain. Depth to base of alluvium, in feet below land surface (bls) Depth to underlying rock, in feet below land surface (bls) as reported in site reports. Homestake Mining Co. defined Thickness of alluvial aquifer variesss by well and cannot represented by a domain. Screen interval in feet below land surface (bls) Depth to top and bottom of screen section below land surface (bls), in feet, as reported in site reports. Homestake Mining Co. defined Screen intervals vary by well and cannot be represented by a domain. Well depth in feet below measurement point Depth measured during borehole logging by the U.S. Geological Survey, in feet below measurement point (MP). During Borehole logging, the well depth is measured in feet below a datum when the probe hits the bottom of the well. Producer defined Well depth variesss and cannot be represented by a domain. USGS reported screen interval, in feet below land surface Depth to top and bottom depths of screen intervals below land surface (bls), in feet, as measured during borehole logging by the U.S. Geological Survey. Producer defined Screen interval variesss by well and cannot be defined by a domain. Top of screen interval, in feet below land surface Top of screen below land surface (bls), in feet, as identified with borehole logging by the U.S. Geological Survey. Producer defined Top of screen variesss by well can cannot be represented by a domain. Measurement point in feet above land surface Stick up of top of casing above land surface (als), in feet. Variations can occur over time from differences in land surface or from measuring at different points of the well. Producer defined Stickup in feet of casing variess by well and cannot be represented by a domain. Pre-deployment water level for passive deployment, in feet below land surface Pre-deployment water-level measurement is collected right before samplers are deployed in well. Water levels measured by U.S. Geological Survey and referenced from below land surface (bls). Producer defined Depth to water level variesss by well and cannot be represented by a domain. Retrieval water level for passive deployment, in feet below land surface Water levels measured by U.S. Geological Survey right before retrieving (pulling out) passive samplers from well. Measured from feet below land surface (bls). Producer defined Water levels vary by well and cannot be represented by a domain. Passive deployment interval, in feet below land surface Range of depths passive samplers were deployed by the U.S. Geological Survey, in feet below land surface. Producer defined Top and bottom depths where passive samplers were deployed in well. In feet below land surface. Comments Comments specific to the well. Producer defined Variable text not represented by a domain. pem18-0007_table02_aug11_18_SB.csv Original uranium results as analyzed by RTI Laboratories. RTI Laboratories Lab sample ID Unique identifier for the lab sample. RTI Laboratories Unique alpha-numeric character assigned by RTI labs. It variesss by well and is not represented by a domain. Client sample identifier NWIS identifier. USGS Field Staff assigned. Combines latitude and longitude with a numeric sequence. Date collected Date water sample was collected. USGS Field Staff Date that variesss with sample. Time collected Time water sample was collected. Uses 24 hour clock. USGS Field Staff 24 hour timestamp that variesss with sample. Date received Day sample was received at laboratory RTI Laboratories Date that variesss with sample. Analysis Date Day when results were computed. RTI Laboratories Date that variesss with sample. Original uncorrected result for Uranium in micrograms per liter. Uncorrected result of RTI Laboratories uranium concentration analysis, in micrograms per liter. RTI Laboratories Numerical value that variesss with sample. Qualifier Conditions associated with results. RTI Laboratories J Estimated RTI Laboratories U Less than detection level. RTI Laboratories MDL Minimum detection level for Uranium established by standard method, in micrograms per liter. RTI Laboratories Numerical value that variesss with analysis method. LOD Limit of detection for Uranium-the lowest detection limit for a set of analyses based on calibrations of the analytical equipment, in micrograms per liter. RTI Laboratories Numerical value that variesss with analysis method. LOQ Limit of quantification for Uranium (aka reporting limit), in micrograms per liter. RTI Laboratories Numerical value that variesss with analysis method. Sample type Describes type of water sample As defined by U.S. Geological Survey and RTI Laboratories. GW-groundwater; Samp-sample; injectate-treated water from plant used for injection; Replicate-replicate sample from same location. Replicate-additional sample Volumetric sample type. Filtered type. Total or dissolved . USGS T-total, unfiltered, raw sample. D-dissolved, filtered with 0.45 micron filter. Sample method Method used to gather the sample. USGS Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. pem18-0007_table03_aug18_18_SB.csv Original selenium concentrations reported by RTI Laboratories. RTI Laboratories analyzed selenium concentrations. Laboratory sample identification number Identifier assigned by RTI lab. RTI Laboratories defined. Unique identifier that cannot be represented by a domain. Client site identifier An identifier that combines latitude and longitude with a numeric sequence to form a unique site identifier as entered into the U.S. Geological Survey National Water Information System (NWIS). This report also appends the local well name to this attribute. USGS Field Staff defined. Combines latitude and longitude with a numeric sequence followed by well name that variessd by well cannot be represented by a domain. Date collected Sample date USGS Field Staff assigned date. Calendar day that the sample was collected. Time collected Time that the sample was collected. USGS Field Staff assigned time. Military time that the sample was collected that variessd by well sample and cannot be defined by a domain. Date received Sample day received at laboratory RTI Laboratories provided date that the sample was received. Sample received date variesss and cannot be represented by a domain. Analysis Date Results computed on the date specified. RTI Laboratories Laboratory analysis date Original uncorrected result in micrograms per liter Uncorrected result for selenium concentration. RTI Laboratories analyzed value. Selenium concentration varies by well and cannot be represented by a domain. Qualifier Conditions associated with sample results. RTI Laboratories assigned attribute. J Estimated value. RTI Laboratories U Not detected value. RTI Laboratories MDL in micrograms per liter Minimum detection level for Selenium- detection limit established by standard method in micrograms per liter. RTI Laboratories Minimum detection level is defined by the laboratory and cannot be represented by a domain, LOD Limit of detection for Selenium-the lowest detection limit for a set of analyses based on calibrations of the analytical equipment. RTI Laboratories defined. Limit of detection is defined by the laboratory and cannot be represented by a domain, LOQ Limit of quantification for Selenium (aka reporting limit). RTI Laboratories Limit of quantification is defined by the laboratory and cannot be represented by a domain,Value Sample type Describes type of sample. RTI laboratories GW-groundwater; Samp-sample; injectate-treated water from plant used for injection; Replicate-replicate sample from same location. See list. Total or dissolved Filtered type USGS assigned based on filtering. T-total, unfiltered, raw. D-dissolved, filtered with 0.45 micron filter. Sample method Method used to gather the sample .How the sample was collected and type of sample. USGS defined. Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. pem18-0007_table04_apr11_18_SB.csv Data contains a subset of reanalyzed uranium concentrations by EPA, Region 6 Laboratory from samples originally analyzed by RTI Laboratories. EPA, Region 6 Laboratory. Sample name Local name of well from which sample was collected. Site reports. Alphanumeric characters that vary with each sample and cannot be represented by a domain. Lab sample identification An EPA, Region 6 numeric unique identifier for sample. EPA, Region 6 Laboratory. Numeric codes assigned in sequential order by the lab. Sample date/time Date and time (24 hour clock) of sample collection (mountain time) in daylight savings time. USGS Field Staff. Date in mm/dd/yyyy format and time in hr:min:sec. Preparation date/time Date and time (24 hour clock) of sample preparation (central time) in daylight savings time. EPA Region 6 Staff. Date in mm/dd/yyyy format and time in hr:min:sec. Analysis date/time Date and time (24 hour clock) of analysis (central time) in daylight savings time. EPA Region 6 Staff Date in mm/dd/yyyy format and time in hr:min:sec. Result in micrograms per liter Uranium concentration in micrograms per liter as determined from EPA Region 6 Laboratory. Samples are from dissolved samples originally analyzed by RTI Laboratories. EPA Region 6 Laboratory Numerical value that variesss with sample and cannot be represented by a domain. Reporting limit in micrograms per liter The reporting limit (sometimes referred to as a quantitation limit) is defined as the lowest concentration at which an analyte can be reliably measured and reported without qualification. Reporting limits are adjusted for sample size, dilution, and matrix interference. Concentrations below the reporting limit are reported as non-detects. EPA Region 6 Laboratory 1 1 micrograms per liter Dilution factor Dilution of sample to allow for determination of concentration. EPA, Region 6 Laboratory. 2 2 1 part sample to 2 part diluent pem18-0007_table05_aug18_18_SB.csv Final adjusted uranium concentrations as described in USGS Open-File Report 2018-1055. Original data reported by RTI Laboratories. Final results from EPA Region 6 Laboratory or adjusted by USGS based on relation between RTI and EPA Lab results as described in USGS OFR 2018-1055. Lab sample identifier EPA Region 6 identifier for sample. EPA Region 6 Numeric identifier assigned to sample by EPA Region 6 Staff. Client sample identifier USGS standard station location identifier based on latitude, longitude, sequence number and local well name USGS Alphanumeric characters based on latitude, longitude, a sequence number and the local well name as reported from previous site studies Date collected Date the sample was collected in mountain time and daylight savings time. USGS Field Staff assigned. Format of date in mm/dd/yyyy. Time Collected Time sample was collected in 24 hour clock format. USGS Field Staff 24 hour timestamp reported as HR:MIN. Original uncorrected result, in micrograms per liter RTI Laboratories reported values of Uranium in micrograms per liter. RTI Laboratories. Numerical values that vary with sample that cannot be represented by a domain. Final result, in micrograms per liter Final concentration of Uranium reported as described in USGS OFR 2018-1055. Defined in USGS OFR 2018-1055. Numeric values reported in micrograms per liter that vary by well and cannot be represented by a domain. Data uncertainty level Relative ranking of data uncertainty for reported concentration of Uranium as described in USGS OFR 2018-1055, table 7. Defined in USGS OFR 2018-1055. I IV Relative ranking Total(T) or Dissolved(D) Filtered (D) or unfiltered (T) sample based on filtering with a 0.45 micron filter. USGS Field Staff T = total; D = dissolved Sample Type Describes type of sample USGS Field Staff GW- initial groundwater sample; Injectate-from plant water; Replicate-additional sample. Sample Method How and type of sample collected USGS Field Staff Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. pem18-0007_table06_aug18_18_SB.csv Final adjusted selenium concentrations as described in USGS Open-File Report 2018-1055. Adjustments made based on sampling comparisons between micropurge and passive as described in USGS OFR 2018-1055. Lab sample identifier EPA Region 6 unique numeric identifier for sample. EPA Region 6. Numeric identifier assigned to sample by EPA Region 6 Staff Client sample identifier USGS standard station location based on latitude, longitude, sequence number, and local well name USGS Alphanumeric identifier based on latitude, longitude, sequence number, and the local well name as reported from previous site studies. Date collected Date the sample was collected. USGS Field Staff assigned. Format of date in mm/dd/yyyy. Time Collected Time sample was collected in 24 hour format. USGS Field Staff 24 hour timestamp reported as HH:MM in MDT (mountain daylight savings time) Original Uncorrected Result, in micrograms per liter RTI Laboratories reported values of selenium in micrograms per liter. RTI Laboratories. Numerical values that vary with sample and cannot be represented by a domain. Final Result, in micrograms per liter Final concentration of selenium in micrograms per liter as described in USGS OFR 2018-1055. USGS OFR 2018-1055. Numeric values reported in micrograms per liter and variesss by well and cannot be represented by a domain. Qualifier Conditions associated with analysis results. RTI Laboratories. J Estimated RTI Laboratories. U Below detection levels. RTI Laboratories. Data Uncertainty level (Table 7) Relative ranking of data uncertainty for reported concentration of Selenium as described in USGS OFR 2018-1055. USGS OFR 2018-1055. I IV Relative ranking Total(T) or Dissolved(D) Filtered (D) or unfiltered (T) sample based on filtering with a 0.45 micron filter. USGS Field Staff. T = total; D = dissolved. Sample type Describes type of sample collected. USGS Field Staff. GW- initial groundwater sample; Injectate-from plant water; Replicate-additional sample. Sample method How and type of sample collected USGS Field Staff. Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. pem18-0007_table07_aug18_18.csv Uncertainty ranking for final results of Uranium and Selenium concentrations As defined in USGS OFR 2018-1055. Sample and laboratory group Grouping of samples by sample method and element. As defined in USGS OFR 2018-1055. Classification as reported in USGS OFR 2018-1055. RTI laboratories standard deviation of the replicates (in RPD). Standard deviation reported in RPD (relative percent difference). As defined in USGS OFR 2018-1055. Numeric values that vary with group and cannot be represented by a domain. EPA Region 6 Lab laboratory control sample (LCS) (in RPD) Standard deviation reported in RPD (relative percent difference). As defined in USGS OFR 2018-1055. Numeric values that vary with group and cannot be represented by a domain. Laboratory conversion, standard deviation of the converted to measured (in RPD). Standard deviation reported in RPD (relative percent difference). As defined in USGS OFR 2018-1055. Numeric values that vary with group and cannot be represented by a domain. Sample conversion for passive samplers , standard deviation of the converted to measured (in RPD) Standard deviation reported in relative percent difference (RPD). As defined in USGS OFR 2018-1055. Numeric values that vary with group and cannot be represented by a domain. Combined standard uncertainty (in RPD) Standard deviation reported in percent RPD (relative percent difference). As defined in USGS OFR 2018-1055. Numeric values that vary with group and cannot be represented by a domain. Equation number in report Referenced equation number in USGS OFR 2018-1055. As defined in USGS OFR 2018-1055. Numeric value for equation number. Uncertainty level ranking High (IV) to Low (I) Referenced in report OFR 2018-1055 where low(I) has a relative low uncertainty level and high(IV) has a relatively high uncertainty level. As defined in USGS OFR 2018-1055. Numeric value of relative ranking from low(I) to high(IV). pem18-0007_app1_aug18_18_SB.csv Depths and methods of well sampling. USGS Field Staff. Well identifier Combined site identifier, well name, and type of sampling method. The site identifier includes the latitude, longitude and a sequence number of the well. The well name is the local name. If it is a volumetric sample, no suffix is added. If it is a micropurge, the suffix micropurge is added. If its a passive sample, the depth is provided below land surface in feet. USGS Field Staff. Alphanumeric character that varies with well and cannot be represented by a domain. Sample Type Either total (T) or dissolved (D) based on filtering sample with a 0.45 micron filter. Assigned by USGS Field Staff. Field contains a T or a D to represent unfiltered or filtered. Site Identification number Numeric identifier that consists of a latitude, longitude and sequence number. Assigned by USGS Field Staff. Numeric value that variesss with well and cannot be represented by a domain. Name This is the local well name. Well names are from information as defined in site reports. Alphanumeric characters that vary with well and cannot be represented by a domain. Depth of sample, in feet Depth of sample in feet below land surface of either the pump intake or midpoint of the passive sampler. Assigned by USGS Field Staff. Numerical values that vary with well and cannot be represented by a domain. Sample Method Method used to collected sample. Assigned by USGS Field Staff. Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. pem18-0007_app2_aug18_18_SB.csv Worksheet that contains adjustments to original uranium concentrations as analyzed and reported by RTI laboratories. USGS Staff and USGS OFR 2018-1055. Site identifier Site identifier that consists of a latitude, longitude, and sequence number. Assigned by USGS Field Staff. Numerical characters that vary with well and cannot be represented by a domain. Well Name This is the local well name as defined by site reports. Local site reports. Alphanumeric characters that vary with well and cannot be represented by a domain. RTI laboratories original result (micrograms per liter) Uncorrected uranium concentration in micrograms per liter as determined by RTI Laboratories. RTI Laboratories. Numerical value that variesss with well and cannot be represented by a domain. Sample type Total (T) or Dissolved (D) based on filtering with a 0.45 micron filter Assigned by USGS Field Staff. T = total; D= dissolved. Well name on EPA Region 6 Lab report Well names given by Homestake and contractors Local information from site reports. Alphanumeric values that vary with well and cannot be represented by a domain. EPA Region 6 Lab result (micrograms per liter) Uranium concentrations from re-analyses of samples, in micrograms per liter. Dissolved samples only. EPA Region 6 Laboratory Numerical values that vary with well and cannot be represented by a domain. Comments from EPA analysis Comments on initial sample information. EPA lab Character strings that vary with well and cannot be represented by a domain. Results from corrected equation (micrograms per liter) without blind sample (=0.1814*(POWER((X),1.1096)) Results from a slightly non-linear regression equation that compares uranium values from the RTI and EPA laboratories. Excludes blind sample. USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with site and cannot be represented by a domain. Results from corrected equation (micrograms per liter) with blind sample (=0.3159*(POWER((X),1.0023)) Results from a non-linear regression equation that compares uranium values from the RTI and EPA laboratories. Includes blind sample. USGS Staff Numerical values that vary with site and cannot be represented by a domain. Difference without blind sample EPA result for uranium minus converted value that excludes blind sample, in micrograms per liter. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with site and cannot be represented by a domain. Difference with blind sample for Uranium EPA result for uranium minus converted value that includes blind sample, in micrograms per liter. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with well and cannot be represented by a domain. Percent difference without blind EPA result for uranium minus converted value that excludes blind sample expressed as an absolute percent difference. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with well and cannot be represented by a domain. Percent difference with blind sample EPA result for uranium minus converted value that includes blind sample expressed as an absolute percent difference.. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with well and cannot be represented by a domain. Results from passive conversion of equation y=0.2811x without blind (U converted [micrograms per liter]) Converted uranium value for passive samplers only that excludes blind sample. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with well and cannot be represented by a domain. Results from passive conversion of equation y=0.2811x with blind (U converted [micrograms per liter]). Converted uranium value that includes blind sample. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with well and cannot be represented by a domain. Final U concentration in micrograms per liter Converted uranium concentration, in micrograms per liter, from laboratory or sample adjustment. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Numerical values that vary with sample and cannot be represented by a domain. Final comments Description of assigned final uranium value. Where EPA value available that value was used otherwise converted based on adjustments from laboratory and sample. Assigned by USGS Staff and explained in USGS OFR 2018-1055. Comment strings that vary with sample. pem18-0007_app3_aug18_18_SB.csv Results from a rerun of water samples for uranium concentrations by RTI Laboratories. RTI Laboratories. Well name Local well name as reported in site reports. Homestake Alphanumeric codes that vary with well. Sample Method Sample method used to collect a sample USGS Field Staff Volumetric-standard purge Three well volumes of water extracted prior to groundwater sampling. USGS Field Staff measured volume. Micropurge-Low volume purge Low volume extracted prior to groundwater sampling. Volume extracted equivalent to 1.5 times the volume of water in the sample tube and pump combined. USGS Field Staff measured volume. Passive-non purge, diffusion sample Equilibrium based passive diffusion sampling with nylon screen. USGS Field Staff designed sampler. Sample type Either total (T) or dissolved (D) based on filtering sample with a 0.45 micron filter USGS Field Staff T = total; D = dissolved Original result in micrograms per liter Original uranium value reported by RTI Laboratories in micrograms per liter. RTI Laboratories Numerical values that vary with sample and cannot be represented by a domain. Rerun result in micrograms per liter Results of sample reruns for uranium, in micrograms per liter, to confirm accuracy of reported results as reported by RTI Laboratories RTI Laboratories Numerical values that vary with sample and cannot be represented by a domain. U.S. Geological Survey- Science Base U.S. Geological Survey mailing and physical

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