Ellie P Foss Emily H Majcher Taylor M Naglieri Madison B Smith Trevor P Needham Caitlyn M Dugan Michelle M Lorah Jeanne B Jaeschke Isabelle M Cozzarelli 20250415 tabular digital data https://doi.org/10.5066/P9TV3Z2K This metadata record contains 14 tables of biogeochemical data collected to evaluate the fate and transport of chlorinated ethenes in Area B groundwater, Fort Detrick, Frederick, Maryland collected during 2018-2020. Included in the dataset are (1) FtD_All_Constituents_NA_2019: concentrations of all non-VOC constituents analyzed as part of the natural attenuation sampling event in 2019, (2) FtD_All_Constituents_NA_2020: concentrations of all non-VOC constituents analyzed as part of the natural attenuation sampling event in 2020, (3) FtD_All_Constituents_PW_2019: concentrations of all non-VOC constituents analyzed as part of the porewater-surface water sampling event in 2019, (4) FtD_All_Constituents_PW_2020: concentrations of all non-VOC constituents analyzed as part of the porewater-surface water sampling event in 2020, (5) FtD_Concentrations_in_Rock_Matrix_VOC_2020: calculated concentrations of VOCs detected in rock matrix cores, extracted in 2020, (6) FtD_ISM_QuantArray_2020: abundance of microbial communities analyzed as part of the in situ microcosm event in 2020, (7) FtD_ISM_VOC_2020: concentrations of VOCs from the in situ microcosm event in 2020, (8) FtD_ISM_Redox_2020: concentrations of oxidation-reduction (redox) constituents from the in situ microcosm event in 2020, (9) FtD_MeOH_Extract_VOC_2020: concentrations of VOCs in methanol extracts of rock cores, extracted in 2020, (10) FtD_NA_VOC_2019: concentrations of VOCs analyzed as part of the natural attenuation sampling event in 2019, (11) FtD_NA_VOC_2020: concentrations of VOCs analyzed as part of the natural attenuation sampling event in 2020, (12) FtD_PW_VOC_2019: concentrations of VOCs analyzed as part of the porewater-surface water sampling event in 2019, (13) FtD_PW_VOC_2020: concentrations of VOCs analyzed as part of the porewater-surface water sampling event in 2020, and (14) FtD_USGS_Laboratory_evaluation_samples_VOC_2020: concentrations of VOCs analyzed as part of laboratory comparison in 2020. These VOC and other biogeochemical analytical data were collected to assess the fate and transport of chlorinated ethenes in Area B groundwater, Fort Detrick, Frederick, Maryland. Appropriate use of the data includes assessment of VOCs and other biogeochemical parameters in various media, evaluating natural attenuation in groundwater, assessing VOCs in rock matrix, and furthering the understanding of groundwater-surface water interactions. 20190821 20200922 observed Complete None planned Frederick County, Maryland -77.46271 -77.42898 39.44276 39.42323 ISO 19115 Topic Category inlandWaters USGS Metadata Identifier USGS:6243687cd34e22d73748d41d None bioremediation microcosm VOC biogeochemical chlorinated ethenes rock core matrix diffusion natural attenuation volatile organic compound 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. Ellie P Foss U.S. Geological Survey, NORTHEAST REGION Physical Scientist mailing address

5522 Research Park Drive

Catonsville MD 21228 US 443-498-5585 efoss@usgs.gov Data collection was made possible through funding provided by the United States Army Environmental Command. Data included in this release were collected and analyzed by U.S. Geological Survey (USGS), ECC, and Microbial Insights. Quality assurance (QA)/quality control (QC) procedures followed are outlined in Majcher and others (2007) and Lorah and others (2014) and are summarized here for field procedures and analytical methods. Field replicates were collected at least 20 percent of locations and all replicates were analyzed for all constituents. Samples were collected in either duplicate or triplicate. Trip blanks accompanied VOC samples during sample collection days and construction blanks consisting of deionized water used to construct passive diffusion bag (PDB) samplers were analyzed in total. Quality control of VOC data consisted of evaluation of surrogates, internal standards, laboratory blanks, calibration checks and hold times (Majcher and others, 2007). It was completed for all VOC results and included assignment of qualifier flags for situations where the QA was not met. In cases where all QA criteria were met adequately, no qualifiers were assigned. A summary of qualifiers for VOCs and their explanations are as follows: B: Constituent detected in laboratory blank X: Analyzed outside the 14-day hold time H: Constituent may have positive bias based on greater than 30% variation from the calibration check analyzed with the samples L: Constituent may have a negative bias based on greater than 30% variation from the calibration check analyzed with the samples J: Constituent concentration was estimated References: Majcher, E.H., Phelan, D.J., Lorah, M.M., and McGinty, A.L., 2007, Characterization of preferential ground-water seepage from a chlorinated hydrocarbon-contaminated aquifer to West Branch Canal Creek, Aberdeen Proving Ground, Maryland, 2002–04: U.S. Geological Survey Scientific Investigations Report 2006–5233, 59 p. plus appendixes, accessed April 20, 2022, at http://pubs.usgs.gov/sir/2006/5233/. Lorah, M.M., Walker, C.W., Baker, A.C., Teunis, J.A., Majcher, E.H., Brayton, M.J., Raffensperger, J.P., and Cozzarelli, I.M, 2014, Hydrogeologic characterization and assessment of bioremediation of chlorinated benzenes and benzene in wetland areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009–12: U.S. Geological Survey Scientific Investigations Report 2014–5140, 89 p., http://dx.doi.org/10.3133/sir20145140. Analytical values are within the Limits of Quantification. Field replicates were collected for at least 20 percent of sample locations and analyzed in total. Laboratory duplicates were analyzed for at least 20 percent of samples and were used to calculate relative percent difference (or relative standard deviation) between multiple analyses. The data include treatment descriptions for biogeochemical field collection, rock core field collection, and an in-situ microcosm. Sampling of the porewater, surface water, groundwater and rock matrix was conducted in 2019 and 2020 at Fort Detrick Area B and nearby Carroll Creek and analyzed for VOCs and bioegeochemical parameters including oxidation-reduction (redox) constituents and alkalinity by the U.S. Geological Survey (USGS), Maryland-Delaware-District of Columbia Water Science Center (MD-DE-DC WSC); all other biogeochemical parameters (including anions, cations, trace metals, nonvolatile dissolved organic carbon (NVDOC), and volatile fatty acids) were analyzed by the USGS Biogeochemical Laboratory, Reston, Virginia (VA). Rock cores were obtained from drilling in 2019 and analyzed by USGS MD-DE-DC WSC for VOC concentrations in methanol extracts. The time that rock core chips were in contact with methanol ranged from 1 to 5 months. The methods followed for methanol extraction are described in Goode et al. (2014) and in Hewitt (1998). Passive samples were collected using passive diffusion bag (PDB) samplers and were constructed of polyethylene (PE) or dialysis membrane to analyze VOCs and biogeochemical parameters, respectively. The PDB samplers were deployed for at least the minimum time period to reach equilibrium for the desired constituent. To compare methods, groundwater samples were collected using PDBs and a modified low-flow groundwater sampling method and were analyzed for VOCs by USGS MD-DE-DC WSC. To compare laboratories, paired groundwater samples collected by the same low-flow method were analyzed by the Army's contract laboratory and the USGS MD-DE-DC WSC, concurrently VOC analyses were conducted at the USGS MD-DE-DC WSC Research laboratory on a purge and trap gas chromatograph with a mass spectrometer (GC-MS) and a headspace autosampler. A modified purge and trap method that combines components of EPA methods 524.2 (U.S. Environmental Protection Agency, 1995) and 8260C (U.S. Environmental Protection Agency, 2006) was implemented on the GC-MS with modifications outlined in Majcher and others (2007). The GC-MS is equipped with an OI Analytical 4560 sample concentrator and an OI Analytical 4552 headspace autosampler. All samples for ammonia, nitrate, sulfide, and dissolved iron were processed by the USGS MD-DE-DC WSC using colorimetric and spectrophotometric analyses. Ammonia and nitrate samples were analyzed in the field using Hach TNTplus Vial Tests. Sulfide samples were also analyzed in the field using Hach Sulfide 1 Reagent and Sulfide 2 Reagent. Iron (ferrous and total) and dissolved gas samples were analyzed at the USGS MD-DE-DC WSC following the methods described in Baedecker and Cozzarelli (1992). These methods are also described in Lorah and others (2014). An in-situ microcosm was conducted in an existing groundwater sampling location in Area B. VOCs and QuantArray-Chlor microbial community results were analyzed by Microbial Insights, INC. The quality assurance/quality control procedures followed are outlined in Majcher and others (2007). References: Baedecker, M.J., and Cozzarelli, I.M., 1992, The determination and fate of unstable constituents in contaminated groundwater, in Lesage, S., and Jackson, R.E., eds., Groundwater contamination and analysis at hazardous waste sites: New York, Marcel Dekker, p. 425–461. Goode, D.J, Imbrigiotta, T.E., Lacombe, P.J., 2014, High-resolution delineation of chlorinated volatile organic compounds in a dipping, fractured mudstone: Depth- and strata dependent spatial variability, Journal of Contaminant Hydrology, 171(2014):1-11, http://dx.doi.org/10.1016/j.jconhyd.2014.10.005. Hewitt, A.D., 1998. Comparison of sample preparation methods for analysis of volatile organic compounds in soil samples. Solvent extraction vs vapor partitioning. Environ. Sci. Technol. 32 (1), 143–149. Lorah, M.M., Walker, C.W., Baker, A.C., Teunis, J.A., Majcher, E.H., Brayton, M.J., Raffensperger, J.P., and Cozzarelli, I.M, 2014, Hydrogeologic characterization and assessment of bioremediation of chlorinated benzenes and benzene in wetland areas, Standard Chlorine of Delaware, Inc. Superfund Site, New Castle County, Delaware, 2009–12: U.S. Geological Survey Scientific Investigations Report 2014–5140, 89 p., http://dx.doi.org/10.3133/sir20145140. Majcher, E.H., Phelan, D.J., Lorah, M.M., and McGinty, A.L., 2007, Characterization of preferential ground-water seepage from a chlorinated hydrocarbon-contaminated aquifer to West Branch Canal Creek, Aberdeen Proving Ground, Maryland, 2002–04: U.S. Geological Survey Scientific Investigations Report 2006–5233, 59 p. plus appendixes, accessed April 20, 2022, at http://pubs.usgs.gov/sir/2006/5233/. U.S. Environmental Protection Agency (EPA), 1995, Method 524.2: Measurement of purgeable organic compounds in water by capillary column gas chromatography/mass spectrometry: U.S. Environmental Protection Agency, Revision 4.1., 47 p., accessed April 20, 2022, at http://www.epa.gov/sam/pdfs/EPA-524.2.pdf. U.S Environmental Protection Agency (EPA), 2006, Method 8260C (SW-846): Volatile organic compounds by gas chromatography/mass spectrometry (GC/MS): U.S. Environmental Protection Agency, Revision 3, 92 p., accessed April 20, 2022, at http://www.epa.gov/sam/pdfs/EPA-8260c.pdf. 20220420 The following biogeochemical constituents were analyzed by the USGS Biogeochemical Laboratory, Reston, VA following the methods described below: NVDOC: Concentrations were determined by high-temperature combustion using a TOC-Vcsn Total Organic Carbon Analyzer (Shimadzu Corporation, Columbia, MD, USA) equipped with an ASI-V autosampler. The acidified samples were sparged with Ultra Zero grade purified air to remove inorganic carbon. Samples were then injected into a combustion tube containing a platinum catalyst and heated, oxidizing all carbon-containing compounds in the sample to carbon dioxide (CO2) gas. Samples were run in duplicate or triplicate if volumes were sufficiently large. Field samples were analyzed with blanks, certified reference material standards, and calibration/check standards. The method, described by Cozzarelli and others (2017), follows U.S. EPA Method 415.1 (U.S. EPA, 1974). NVDOC concentrations are reported in milligrams per liter (mg/L) of carbon (C). Reported data includes median (run in triplicate), mean (run in duplicate), n (number of analyses), standard deviation (S.D.), and percent relative standard deviation (%RSD). The method detection limit for this instrument was 0.216 mg/L of C. Reporting limits were between 0.6-30 mg/L of C. Alkalinity: Concentrations were measured in mg/L of HCO3- (bicarbonate), using a TIM900 Titration Manager (software version 2.1) and an ABU901 Autoburette (Radiometer Copenhagen, Prinses Beatrixlann 301, Netherlands; Hach, Loveland, Colorado, USA). This analytical system adds a titrant of ~0.00274 N (normality) H2SO4 (sulfuric acid) or ~0.027 N HCl (hydrochloric acid) using a continuous inflection point titration to bring the water sample to a pH of ~4.2; the titration was continuously monitored using a pH meter and electrode. The method used for alkalinity analysis is described in the U.S. Geological Survey Techniques for Water-Resources Investigations (2017). Field collection and analyses are described by Cozzarelli and others (2017). Samples were analyzed along with both field and laboratory blanks. Alkalinity concentration includes median (run in triplicate) or mean (run in duplicate), n (number of samples), S.D. (standard deviation), and %RSD (percent relative standard deviation). The method detection limit was 0.50 mg/L HCO3-. Anions: Concentrations were measured as mg/L using suppressed ion chromatography. A Thermo Dionex ICS 1000 ion chromatograph with an ED50 electrochemical detector and a high capacity AS14 anion-exchange column (Thermo Fisher Scientific, Waltham, Massachusetts, USA) was used. The method employs a carbonate/bicarbonate eluent coupled with suppressed conductivity detection to determine chloride in various sample matrices and meets the performance requirements specified in EPA Method 300.0 (U.S. EPA, 1997). Anion concentrations include median (run in triplicate), mean (run in duplicate), n, S.D., and %RSD. Field collection and analyses are described by Cozzarelli and others (2017). Method detection limits varied by analyte and ranged from 0.043 to 0.196 mg/L; reporting limits were 0.1-125 mg/L. Ammonia: Concentrations were measured as total dissolved NH3-N on an AQ2 Discrete Seal Analyzer (Seal Analytical, Mequon, Wisconsin). Alkaline phenol and hypochlorite react with NH3 to form indophenol blue. Sodium nitroferricyanide dehydrate intensifies the indophenol blue color, and the sample is measured spectrophotometrically at 650-660 nanometers (nm). Reported values of ammonia include median (run in triplicate), mean (run in duplicate), n, S.D., and %RSD. Analyses followed U.S. EPA method 350.1 (U.S. EPA, 1993) and are further described by Cozzarelli and others (2017). The reporting limits were 0.02 to 2 mg/L of N. Cations: Concentrations were measured as mg/L using a Perkin Elmer Optima 4300DV inductively coupled plasma-optical emission spectrometer (ICP-OES) (PerkinElmer, Hopkinton, Massachusetts, USA) following U.S. EPA Method 200.7 (U.S. EPA, 1994). Approximately 80% of the samples analyzed for cation concentrations were run in duplicate with blanks, calibration standards, and certified reference standards. The precision of repetitive measurements with the ICP-OES was typically less than 5%. Internal standards were used to compensate for system drift and analyze complex matrices that might affect instrument performance. Cation concentrations include median (run in triplicate), mean (run in duplicate), n, S.D., and %RSD. Field collection and analyses are described by Cozzarelli and others (2017). The reporting limits were 0.2-200 mg/L for undiluted samples. Trace elements: Trace element concentrations were measured from an aliquot from the cation vial using an Agilent 7900 Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) (Agilent, Santa Clara, California, USA). The procedures used followed EPA Method 200.7 (U.S. EPA, 1994). Approximately 20% of the samples analyzed by ICP-MS were run in duplicate along with blanks and calibration standards. Internal standards were used to compensate for system drift and for analysis of complex matrices which might affect the instrument's performance. The precision of repetitive measurements was typically less than 3%. The detection limits for the ICP-MS analyses ranged from 0.001 to 2.1 micrograms per liter (µg/L), and reporting limits ranged from 0.05 to 200 µg/L, depending on the element. If a sample were diluted for analysis, detection and reporting limits would reflect the dilution factor. Low molecular weight organic acids (LMWOA): Concentrations of monovalent carboxylic acids lactate, acetate, propionate, formate, butyrate, pyruvate, and benzoate were measured as mg/L using a Dionex ICS2100 Ion Chromatograph with an IonPac AS11-HC anion exchange column, a potassium hydroxide gradient pump, and an IonPac AG11-HC on-guard column (Thermo Fisher Scientific, Waltham, Massachusetts). The AG11-HC guard column is packed with a microporous resin with a low binding capacity. The low capacity ensures the optimum long-term performance of the guard column. Analytical methods are described by Akob and others (2015). The method detection limits ranged from 0.114 to 0.792 mg/L, and the reporting limits vary from 0.1 to 8.0 mg/L, depending on the analyte. If a sample were diluted for analysis, detection limits and reporting limits would reflect the dilution factor. References: Akob, D.M., Cozzarelli, I.M., Dunlap, D.S., Rowan, E.L., Lorah, M.M. Organic and inorganic composition and microbiology of produced waters from Pennsylvania shale gas wells. Applied Geochemistry. 60. 116-125. https://doi.org/10.1016/j.apgeochem.2015.04.011 Cozzarelli, I.M., Skalak, K.J, Kent, D.B., Engle, M.A., Benthem, A., Mumford, A.C., Haase, K., Farag, A., Harper, D., Nagel, S.C., Iwanowicz, L.R., Orem, W.H., Akob, D.M., Jaeschke, J.B., Galloway, J., Kohler, M., Stoliker, D.L., Jolly, G.D. Environmental signatures and effects of an oil and gas wastewater spill in the Williston Basin, North Dakota. Science of The Total Environment. 579. 1781-1793. https://doi.org/10.1016/j.scitotenv.2016.11.157 U.S. EPA. 1974. Method 415.1: Organic carbon, total (combustion or oxidation). https://www.nemi.gov/methods/method_summary/5403/ U.S. EPA. 1993. Method 350.1: Determination of ammonia nitrogen by semi-automated colorimetry. https://www.epa.gov/sites/default/files/2015-06/documents/epa-350.1.pdf U.S. EPA. 1994. Method 200.7: Determination of metals and trace elements in water and wastes by inductively coupled plasma-atomic emission spectrometry. https://www.epa.gov/sites/default/files/2015-06/documents/epa-200.7.pdf U.S. EPA. 1997. Method 300.1: Determination of inorganic anions in drinking water by ion chromatography. https://www.epa.gov/sites/default/files/2015-06/documents/epa-300.1.pdf U.S. Geological Survey. 2017. Alkalinity titration: National Research Program, Quality Management System Technical SOP NRP-2017-SOP-01.01.; Rounds, S.A., revised by, 2012, Alkalinity and acid-neutralizing capacity, in the National field manual for the collection of water-quality data: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chap. A6.6, version 4.0 (9/2012), 45 p. 20220524 FtD_PW_VOC_2019.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data in porewater samples collected in 2019. USGS Defined Collection_Date Date passive sampler was collected from the field. USGS Defined -- Date of collection not recorded. USGS Defined 8/21/2019 8/21/2019 Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected porewater. Names are unique per sample, but in some cases several samples were collected from the same site. Field replicates are indicated by "R" in the sample name. A sample name beginning with "CB" stands for Construction Blank created during the sampling event. Sample names beginning with "PW" indicate that a porewater sample was collected. Sample names beginning with "SW" indicate that a surface water sample was collected. Sample names beginning with "SEEP" indicate that a sample was collected from a seep. Sample_ID Unique identification number for the sampled site. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one site. These are represented by .1/.2/.R/.2R etc. Dichlorodifluoromethane Concentration of Dichlorodifluoromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dichlorodifluoromethane_QA Quality assurance information associated with Dichlorodifluoromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Chloromethane Concentration of Chloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloromethane_QA Quality assurance information associated with Chloromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Vinyl.Chloride Concentration of Vinyl Chloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Vinyl.Chloride_QA Quality assurance information associated with Vinyl Chloride concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Bromomethane Concentration of Bromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromomethane_QA Quality assurance information associated with Bromomethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Chloroethane Concentration of Chloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane_QA Quality assurance information associated with Chloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Trichlorofluoromethane Concentration of Trichlorofluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.04 1.25 micrograms per liter Trichlorofluoromethane_QA Quality assurance information associated with Trichlorofluoromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1-Dichloroethene Concentration of 1,1-Dichloroethene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.53 0.61 micrograms per liter 1,1-Dichloroethene_QA Quality assurance information associated with 1,1-Dichloroethene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Methylene.Chloride Concentration of Methylene Chloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Methylene.Chloride_QA Quality assurance information associated with Methylene Chloride concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. trans-1,2-Dichloroethene Concentration of trans-1,2-Dichloroethene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.84 1.84 micrograms per liter trans-1,2-Dichloroethene_QA Quality assurance information associated with trans-1,2-Dichloroethene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1-Dichloroethane Concentration of 1,1-Dichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloroethane_QA Quality assurance information associated with 1,1-Dichloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. cis-1,2-Dichloroethene Concentration of cis-1,2-Dichloroethene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.53 micrograms per liter cis-1,2-Dichloroethene_QA Quality assurance information associated with cis-1,2-Dichloroethene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 2,2-Dichloropropane Concentration of 2,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2,2-Dichloropropane_QA Quality assurance information associated with 2,2-Dichloropropane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Bromochloromethane Concentration of Bromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane_QA Quality assurance information associated with Bromochloromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Chloroform Concentration of Chloroform. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.55 1.5 micrograms per liter Chloroform_QA Quality assurance information associated with Chloroform concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,1-Trichloroethane_QA Quality assurance information associated with 1,1,1-Trichloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1-Dichloropropene Concentration of 1,1-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloropropene_QA Quality assurance information associated with 1,1-Dichloropropene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Carbon.Tetrachloride Concentration of Carbon Tetrachloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride_QA Quality assurance information associated with Carbon Tetrachloride concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Benzene Concentration of Benzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene_QA Quality assurance information associated with Benzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2-Dichloroethane Concentration of 1,2-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.87 0.87 micrograms per liter 1,2-Dichloroethane_QA Quality assurance information associated with 1,2-Dichloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Trichloroethylene Concentration of Trichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.59 6.3 micrograms per liter Trichloroethylene_QA Quality assurance information associated with Trichloroethylene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. The qualifier "B" stands for Blank contamination. This indicates possible positive bias due to suspected laboratory contamination. 1,2-Dichloropropane Concentration of 1,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichloropropane_QA Quality assurance information associated with 1,2-Dichloropropane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Dibromomethane Concentration of Dibromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane_QA Quality assurance information associated with Dibromomethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Bromodichloromethane Concentration of Bromodichloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane_QA Quality assurance information associated with Bromodichloromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene_QA Quality assurance information associated with cis-1,3-Dichloropropene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Toluene Concentration of Toluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene_QA Quality assurance information associated with Toluene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,3-Dichloropropene_QA Quality assurance information associated with trans-1,3-Dichloropropene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane_QA Quality assurance information associated with 1,1,2-Trichloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Tetrachloroethylene Concentration of Tetrachloroethylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tetrachloroethylene_QA Quality assurance information associated with Tetrachloroethylene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,3-Dichloropropane Concentration of 1,3-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichloropropane_QA Quality assurance information associated with 1,3-Dichloropropane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Dibromochloromethane Concentration of Dibromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane_QA Quality assurance information associated with Dibromochloromethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane_QA Quality assurance information associated with 1,2-Dibromoethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Chlorobenzene Concentration of Chlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene_QA Quality assurance information associated with Chlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,1,2-Tetrachloroethane_QA Quality assurance information associated with 1,1,1,2-Tetrachloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Ethylbenzene Concentration of Ethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene_QA Quality assurance information associated with Ethylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. M&P-Xylene Concentration of M&P-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. M&P-Xylene_QA Quality assurance information associated with M&P-Xylene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. O-Xylene Concentration of O-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. O-Xylene_QA Quality assurance information associated with O-Xylene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Styrene Concentration of Styrene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Styrene_QA Quality assurance information associated with Styrene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Bromoform Concentration of Bromoform. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform_QA Quality assurance information associated with for Bromoform concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Isopropylbenzene Concentration of Isopropylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropylbenzene_QA Quality assurance information associated with Isopropylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Bromobenzene Concentration of Bromobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromobenzene_QA Quality assurance information associated with Bromobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.54 2.23 micrograms per liter 1,1,2,2-Tetrachloroethane_QA Quality assurance information associated with 1,1,2,2-Tetrachloroethane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "B" stands for Blank contamination. This indicates possible positive bias due to suspected laboratory contamination. The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane. Less than values are under detection range. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichloropropane_QA Quality assurance information associated with 1,2,3-Trichloropropane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. n-Propylbenzene Concentration of n-Propylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene_QA Quality assurance information associated with n-Propylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 2-Chlorotoluene Concentration of 2-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene_QA Quality assurance information associated with 2-Chlorotoluene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 4-Chlorotoluene Concentration of 4-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene_QA Quality assurance information associated with 4-Chlorotoluene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. tert-Butylbenzene Concentration of tert-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene_QA Quality assurance information associated with tert-Butylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene_QA Quality assurance information associated with 1,3,5-Trimethylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. sec-Butylbenzene Concentration of sec-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene_QA Quality assurance information associated with sec-Butylbenzene. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichlorobenzene_QA Quality assurance information associated with 1,3-Dichlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Isopropyltoluene Concentration of Isopropyltoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene_QA Quality assurance information associated with Isopropyltoluene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,4-Dichlorobenzene_QA Quality assurance information associated with 1,4-Dichlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trimethylbenzene_QA Quality assurance information associated with 1,2,4-Trimethylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. n-Butylbenzene Concentration of n-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene_QA Quality assurance information associated with n-Butylbenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichlorobenzene_QA Quality assurance information associated with 1,2-Dichlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 4.95 4.95 micrograms per liter 1,2-Dibromo-3-Chloropropane_QA Quality assurance information associated with 1,2-Dibromo-3-Chloropropane concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene_QA Quality assurance information associated with 1,2,4-Trichlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Hexachlorobutadiene Concentration of Hexachlorobutadiene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Hexachlorobutadiene_QA Quality assurance information associated with Hexachlorobutadiene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. Naphthalene Concentration of Naphthalene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Naphthalene_QA Quality assurance information associated with Naphthalene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichlorobenzene_QA Quality assurance information associated with 1,2,3-Trichlorobenzene concentrations. Concentrations with a qualifier will have one or more letter codes in this field that signify at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "X" indicates that the recommended 14-day holding time was exceeded, which could result in losses for some or all compounds. FtD_PW_VOC_2020.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data in porewater samples collected in 2020. All quality assurance criteria were met and therefore no columns with qualifiers are included in the file. USGS Defined Collection_Date Date passive sampler was collected from the field. USGS Defined 8/6/2020 8/7/2020 Sample_ID Unique identification number for the sampled site. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one site. These are represented by .1 and .2. A sample ID beginning with "TB" indicates that a Trip Blank was collected for the sampling event. Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected sample. Names are unique per sample, but in some cases several samples were collected from the same site. Sample names beginning with "PW" indicate that a porewater sample was collected. Sample names beginning with "SW" indicate that a surface water sample was collected. Sample names beginning with "PWS" indicate that a sample was collected from a seep. If multiple seep samples were collected in the same vicinity, a directional identifier was included in the name to represent the stream side ("W" indicates west, "E" indicates east). Dichlorodifluoromethane Concentration of Dichlorodifluoromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloromethane Concentration of Chloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Vinyl.Chloride Concentration of Vinyl Chloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromomethane Concentration of Bromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane Concentration of Chloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Trichlorofluoromethane Concentration of Trichlorofluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.02 2.49 micrograms per liter 1,1-Dichloroethylene Concentration of 1,1-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.6 micrograms per liter Methylene.Chloride Concentration of Methylene Chloride. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.5 micrograms per liter trans-1,2-Dichloroethylene Concentration of trans-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.5 micrograms per liter 1,1-Dichloroethane Concentration of 1,1-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.5 micrograms per liter cis-1,2-Dichloroethylene Concentration of cis-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.57 0.9 micrograms per liter 2,2-Dichloropropane Concentration of 2,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane Concentration of Bromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroform Concentration of Chloroform. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 1.58 micrograms per liter 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloropropene Concentration of 1,1-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride Concentration of Carbon Tetrachloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene Concentration of Benzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.64 2.28 micrograms per liter 1,2-Dichloroethane Concentration of 1,2-Dichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Trichloroethylene Concentration of Trichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.68 8.03 micrograms per liter 1,2-Dichloropropane Concentration of 1,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane Concentration of Dibromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane Concentration of Bromodichloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene Concentration of Toluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tetrachloroethylene Concentration of Tetrachloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 0.56 micrograms per liter 1,3-Dichloropropane Concentration of 1,3-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane Concentration of Dibromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene Concentration of Chlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene Concentration of Ethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. M&P-Xylene Concentration of M&P-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. O-Xylene Concentration of O-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Styrene Concentration of Styrene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform Concentration of Bromoform. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropylbenzene Concentration of Isopropylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromobenzene Concentration of Bromobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene Concentration of n-Propylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene Concentration of 2-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene Concentration of 4-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene Concentration of tert-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene Concentration of sec-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene Concentration of Isopropyltoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene Concentration of n-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Hexachlorobutadiene Concentration of Hexachlorobutadiene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Naphthalene Concentration of Naphthalene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. FtD_USGS_laboratory_evaluation_samples_VOC_2020.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data from groundwater samples collected in 2020 using a modified low-flow groundwater sampling method for evaluation of the laboratory method. All quality assurance criteria were met and therefore no columns with qualifiers are included in the file. USGS Defined Collection_Date Date that USGS laboratory evaluation groundwater sample was collected from the field. USGS Defined 4/15/2020 6/3/2020 Sample_ID Unique identification number for the sample location. USGS Defined - No sample ID associated with the sample. USGS Defined Each sample is given an identification number that corresponds with the sample name. Sample ID's are unique per sample. Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one sample location. Field replicates are indicated by "REP" in the sample name. Dichlorodifluoromethane Concentration of Dichlorodifluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.85 6.85 micrograms per liter Chloromethane Concentration of Chloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Vinyl.Chloride Concentration of Vinyl Chloride. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). USGS Defined 1.04 78.34 micrograms per liter Bromomethane Concentration of Bromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane Concentration of Chloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Trichlorofluoromethane Concentration of Trichlorofluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.86 702.24 micrograms per liter 1,1-Dichloroethylene Concentration of 1,1-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.81 196.05 micrograms per liter Methylene.Chloride Concentration of Methylene Chloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,2-Dichloroethylene Concentration of trans-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 3.15 3.15 micrograms per liter 1,1-Dichloroethane Concentration of 1,1-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.28 8.69 micrograms per liter cis-1,2-Dichloroethylene Concentration of cis-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.58 899.9 micrograms per liter 2,2-Dichloropropane Concentration of 2,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane Concentration of Bromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroform Concentration of Chloroform. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.58 590.42 micrograms per liter 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.52 43.13 micrograms per liter 1,1-Dichloropropene Concentration of 1,1-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride Concentration of Carbon Tetrachloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene Concentration of Benzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 105.25 105.25 micrograms per liter 1,2-Dichloroethane Concentration of 1,2-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.69 24.04 micrograms per liter Trichloroethylene Concentration of Trichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.22 2581.64 micrograms per liter 1,2-Dichloropropane Concentration of 1,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane Concentration of Dibromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane Concentration of Bromodichloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene Concentration of Toluene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.56 1.56 micrograms per liter trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 2.53 2.53 micrograms per liter Tetrachloroethylene Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 162.75 micrograms per liter 1,3-Dichloropropane Concentration of 1,3-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane Concentration of Dibromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene Concentration of Chlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 10.3 10.3 micrograms per liter 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene Concentration of Ethylbenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 7.64 7.64 micrograms per liter M&P-Xylene Concentration of M&P-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. O-Xylene Concentration of O-Xylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 7.23 7.23 micrograms per liter Styrene Concentration of Styrene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform Concentration of Bromoform. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropylbenzene Concentration of Isopropylbenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 2.92 2.92 micrograms per liter Bromobenzene Concentration of Bromobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 13.27 13.27 micrograms per liter 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.38 1.38 micrograms per liter 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene Concentration of n-Propylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene Concentration of 2-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene Concentration of 4-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene Concentration of tert-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene Concentration of sec-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene Concentration of Isopropyltoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 9.56 9.56 micrograms per liter 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene Concentration of n-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.01 6.01 micrograms per liter 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.57 167.4 micrograms per liter Hexachlorobutadiene Concentration of Hexachlorobutadiene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Naphthalene Concentration of Naphthalene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.79 6.79 micrograms per liter 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.05 3.03 micrograms per liter FtD_NA_VOC_2019.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data in passive samples collected in 2019 for assessment of natural attenuation (NA) in groundwater. Constituents that met all quality assurance criteria do not have associated qualifier columns in the file. USGS Defined Collection_Date Date passive sampler was collected from the field. USGS Defined - Date of collection not recorded. USGS Defined 10/28/2019 11/6/2019 Sample_ID Unique identification number for the sample location. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one sample location. These are represented by .1R and indicate that a field replicate sample was collected at the site. Samples ending in .1 indicate the first sample collected at the site. “Ft D trip blank 1” indicates that the first trip blank was collected during the sampling event. “Ft D trip blank 2” indicates that the second trip blank was collected during the sampling event. “Ft D const blank 1” indicates that one construction blank was collected during the construction of passive diffusion bag (PDB) samplers prior to sampler deployment. Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one sample location. An "R" at the end of the sample name indicates a field replicate sample was collected. “BLANK” indicates that a blank sample was collected. A blank sample could be either a trip blank or a construction blank as specified in the sample ID. Dichlorodifluoromethane Concentration of Dichlorodifluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.64 3.42 micrograms per liter Chloromethane Concentration of Chloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloromethane_QA Quality assurance information associated with Chloromethane concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "B" stands for Blank contamination. This indicates possible positive bias due to suspected laboratory contamination. Vinyl.Chloride Concentration of Vinyl Chloride. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.87 8.13 micrograms per liter Bromomethane Concentration of Bromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromomethane_QA Quality assurance information associated with Bromomethane concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Chloroethane Concentration of Chloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane_QA Quality assurance information associated with Chloroethane concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Trichlorofluoromethane Concentration of Trichlorofluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.82 434.89 micrograms per liter 1,1-Dichloroethylene Concentration of 1,1-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.51 97.19 micrograms per liter Methylene.Chloride Concentration of Methylene Chloride. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.61 0.82 micrograms per liter trans-1,2-Dichloroethylene Concentration of trans-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.99 0.99 micrograms per liter 1,1-Dichloroethane Concentration of 1,1-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.51 6.84 micrograms per liter cis-1,2-Dichloroethylene Concentration of cis-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.55 314.35 micrograms per liter 2,2-Dichloropropane Concentration of 2,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane Concentration of Bromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroform Concentration of Chloroform. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.54 552.25 micrograms per liter 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.11 13.95 micrograms per liter 1,1-Dichloropropene Concentration of 1,1-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride Concentration of Carbon Tetrachloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene Concentration of Benzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 7.97 micrograms per liter 1,2-Dichloroethane Concentration of 1,2-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.89 16.83 micrograms per liter Trichloroethylene Concentration of Trichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.87 881.35 micrograms per liter Trichloroethylene_QA Quality assurance information associated with Trichloroethylene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "B" stands for Blank contamination. This indicates possible positive bias due to suspected laboratory contamination. 1,2-Dichloropropane Concentration of 1,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane Concentration of Dibromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane Concentration of Bromodichloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene Concentration of Toluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tetrachloroethylene Concentration of Tetrachloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 38.43 micrograms per liter 1,3-Dichloropropane Concentration of 1,3-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane Concentration of Dibromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene Concentration of Chlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.62 2.23 micrograms per liter 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene Concentration of Ethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. M&P-Xylene Concentration of M&P-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. O-Xylene Concentration of O-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Styrene Concentration of Styrene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform Concentration of Bromoform. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropylbenzene Concentration of Isopropylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromobenzene Concentration of Bromobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.55 1.72 micrograms per liter 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene Concentration of n-Propylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene Concentration of 2-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene Concentration of 4-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene Concentration of tert-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene Concentration of sec-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene Concentration of Isopropyltoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene Concentration of n-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.55 1.67 micrograms per liter 1,2,4-Trichlorobenzene_QA Quality assurance information associated with 1,2,4-Trichlorobenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Hexachlorobutadiene Concentration of Hexachlorobutadiene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Hexachlorobutadiene_QA Quality assurance information associated with Hexachlorobutadiene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Naphthalene Concentration of Naphthalene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.58 0.58 micrograms per liter 1,2,3-Trichlorobenzene_QA Quality assurance information associated with 1,2,3-Trichlorobenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). FtD_NA_VOC_2020.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data in passive samples collected in 2020 for assessment of natural attenuation (NA) in groundwater. Constituents that met all quality assurance criteria do not have associated qualifier columns in the file. USGS Defined Collection_Date Date passive sampler was collected from the field. USGS Defined 6/23/2020 6/24/2020 Sample_ID Unique identification number for the sample location. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample. Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample. Sample names beginning with "TB" indicate that a trip blank was collected for the sampling event. Dichlorodifluoromethane Concentration of Dichlorodifluoromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloromethane Concentration of Chloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Vinyl.Chloride Concentration of Vinyl Chloride. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 70.3 70.3 micrograms per liter Bromomethane Concentration of Bromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane Concentration of Chloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane_QA Quality assurance information associated with Chloroethane concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "L" indicates possible negative bias, based on an unacceptably low response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Trichlorofluoromethane Concentration of Trichlorofluoromethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 409.77 micrograms per liter 1,1-Dichloroethylene Concentration of 1,1-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.64 169.48 micrograms per liter Methylene.Chloride Concentration of Methylene Chloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,2-Dichloroethylene Concentration of trans-1,2-Dichloroethylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloroethane Concentration of 1,1-Dichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,2-Dichloroethylene Concentration of cis-1,2-Dichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.61 957.24 micrograms per liter 2,2-Dichloropropane Concentration of 2,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane Concentration of Bromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroform Concentration of Chloroform. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.52 523.17 micrograms per liter 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 8.24 33.76 micrograms per liter 1,1-Dichloropropene Concentration of 1,1-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride Concentration of Carbon Tetrachloride. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene Concentration of Benzene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 2.43 91.89 micrograms per liter 1,2-Dichloroethane Concentration of 1,2-Dichloroethane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.91 25.11 micrograms per liter Trichloroethylene Concentration of Trichloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.5 2097.94 micrograms per liter 1,2-Dichloropropane Concentration of 1,2-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane Concentration of Dibromomethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane Concentration of Bromodichloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene Concentration of Toluene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 1.18 1.18 micrograms per liter trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tetrachloroethylene Concentration of Tetrachloroethylene. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 0.51 21.85 micrograms per liter 1,3-Dichloropropane Concentration of 1,3-Dichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane Concentration of Dibromochloromethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene Concentration of Chlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene Concentration of Ethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. M&P-Xylene Concentration of M&P-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. O-Xylene Concentration of O-Xylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Styrene Concentration of Styrene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform Concentration of Bromoform. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropylbenzene Concentration of Isopropylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromobenzene Concentration of Bromobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene Concentration of n-Propylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene Concentration of 2-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene Concentration of 4-Chlorotoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene Concentration of tert-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene Concentration of sec-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene Concentration of Isopropyltoluene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene_QA Quality assurance information associated with Isopropyltoluene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene Concentration of n-Butylbenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Hexachlorobutadiene Concentration of Hexachlorobutadiene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Naphthalene Concentration of Naphthalene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. FtD_ISM_Redox_2020.csv Comma Separated Value (CSV) file containing oxidation-reduction (redox) data from passive samplers contained in the in-situ microcosm (ISM) conducted in 2020. USGS Defined Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater and treatment type. Names are unique per sample, but in some cases several samples were collected from one sample location. "MNA" represents the control sample. "BIOSTIM" stands for the biostimulation treatment. "BIOAUG" stands for the bioaugmentation treatment. Sample_ID Unique identification number for the sample location. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from the same sample location and treatment type. These are represented by .1 and .2. Collection_Date Date that the in-situ microcosm was collected from the field. USGS Defined 9/22/2020 9/22/2020 NVDOC Dissolved organic carbon. USGS Defined NC Sample not collected. USGS Defined 47 74.4 milligrams per liter of Carbon F Concentration of Fluorine. USGS Defined 1.33 3.93 milligrams per liter Cl Concentration of Chlorine. USGS Defined 21.8 23.4 milligrams per liter Br Concentration of Bromine. USGS Defined 1.41 2.37 milligrams per liter NO3 Concentration of Nitrate. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. PO4 Concentration of Phosphate. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. SO4 Concentration of Sulfate. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Ca Concentration of Calcium. USGS Defined 73.7 78.7 milligrams per liter Na Concentration of Sodium. USGS Defined 46.7 65.2 milligrams per liter Mg Concentration of Magnesium. USGS Defined 30.1 32.2 milligrams per liter K Concentration of Potassium. USGS Defined 3.51 3.95 milligrams per liter Si Concentration of Silicon. USGS Defined 6.24 6.81 milligrams per liter Sr Concentration of Strontium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 25.4 61.1 micrograms per liter Al Concentration of Aluminum. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe Concentration of Iron. USGS Defined 22.1 300 micrograms per liter Mn Concentration of Manganese. USGS Defined 113 297 micrograms per liter B Concentration of Boron. USGS Defined 21.3 47.5 micrograms per liter Ba Concentration of Barium. USGS Defined 161 594 micrograms per liter Li Concentration of Lithium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cu Concentration of Copper. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.6 6.9 micrograms per liter Zn Concentration of Zinc. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Be Concentration of Beryllium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. V Concentration of Vanadium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cr Concentration of Chromium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Co Concentration of Cobalt. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ni Concentration of Nickel. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. As Concentration of Arsenic. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Se Concentration of Selenium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Rb Concentration of Rubidium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Mo Concentration of Molybdenum. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ag Concentration of Silver. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cd Concentration of Cadmium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Sb Concentration of Antimony. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. La Concentration of Lanthanum. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ce Concentration of Cerium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tl Concentration of Thallium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Pb Concentration of Lead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. U Concentration of Uranium. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Lactate Concentration of Lactate. Less than values are below the detection limit. USGS Defined NC Sample not collected. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Acetate Concentration of Acetate. USGS Defined NC Sample not collected. USGS Defined 35.9 57.4 milligrams per liter Propionate Concentration of Propionate. USGS Defined NC Sample not collected. USGS Defined 49.9 99 milligrams per liter Formate Concentration of Formate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample not collected. USGS Defined 0.158 0.158 milligrams per liter Butyrate Concentration of Butyrate. USGS Defined NC Sample not collected. USGS Defined 0.345 0.605 milligrams per liter Pyruvate Concentration of Pyruvate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample not collected. USGS Defined 0.128 0.169 milligrams per liter Benzoate Concentration of Benzoate. USGS Defined NC Sample not collected. USGS Defined 0.619 4.02 milligrams per liter CH4 Concentration of Methane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 29.98 53.48 micrograms per liter C2H4 Concentration of Ethylene. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H6 Concentration of Ethane. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe 2+ Concentration of Ferrous Iron. Less than values are below the detection limit. USGS Defined NC Sample not collected. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Fe Total Concentration of Total Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined 0.4 0.43 milligrams per liter S2- Concentration of Sulfide. Less than values are below the detection limit. USGS Defined NC Sample not collected. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. NH3 Concentration of Ammonia. USGS Defined NC Sample not collected. USGS Defined 0.42 0.51 milligrams per liter FtD_ISM_VOC_2020.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data from passive samplers in the in-situ microcosm (ISM) in 2020. For constituents that met all quality assurance criteria or are not qualified, no columns with qualifiers are included in the file. USGS Defined Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater and treatment type. Names are unique per sample, but in some cases several samples were collected from one sample location. "MNA" represents the control sample. "BioStim" stands for the biostimulation treatment. "BioAug" stands for the bioaugmentation treatment. Extraction_Date The date that passive samplers within the in-situ microcosm were collected. USGS Defined 9/22/2020 9/22/2020 Tetrachloroethene Concentration of Tetrachloroethene. USGS Defined 35.6 40.8 micrograms per liter Trichloroethene Concentration of Trichloroethene. USGS Defined 404 503 micrograms per liter cis-1,2-Dichloroethene Concentration of cis-1,2-Dichloroethene. USGS Defined 40.3 64.6 micrograms per liter trans-1,2-Dichloroethene Concentration of trans-1,2-Dichloroethene. USGS Defined 0.3 1.1 micrograms per liter trans-1,2-Dichloroethene_QA Quality assurance information associated with trans-1,2-Dichloroethene concentrations. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "J" indicates an estimated result. Vinyl chloride Concentration of Vinyl chloride. USGS Defined 0.4 3.7 micrograms per liter Vinyl chloride_QA Quality assurance information associated with Vinyl chloride concentrations. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "J" indicates an estimated result. FtD_ISM_QuantArray_2020.csv Comma Separated Value (CSV) file containing microbial QuantArray data from the in-situ microcosm (ISM) in 2020. All genes that met all quality assurance criteria or are not qualified do not include columns for qualifiers in the file. USGS Defined Sample_Name Origin of sample. USGS Defined Each sample is named according to the origin of the collected groundwater and treatment type. Names are unique per sample. "MNA" represents the control sample. "BioStim" stands for the biostimulation treatment. "BioAug" stands for the bioaugmentation treatment. Extraction_Date The date that microbial samples were collected from the in-situ microcosm (ISM). USGS Defined 9/22/2020 9/22/2020 sulfate reducing bacteria The number of sulfate reducing bacteria cells per bead. USGS Defined 362000 575000 cells per bead BAV1 Vinyl Chloride Reductase The number of BAV1 Vinyl Chloride Reductase cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 6 4390 cells per bead BAV1 Vinyl Chloride Reductase_QA Quality assurance information associated with BAV1 Vinyl Chloride Reductase cells. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "J" stands for estimated gene copies. cerA Reductase The number of cerA Reductase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Chloroform Reductase The number of Chloroform Reductase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. 1,1 DCA Reductase The number of 1,1 DCA Reductase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. 1,2 DCA Reductase The number of 1,2 DCA Reductase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Dehalobacter DCM The number of Dehalobacter DCM cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Dichloromethane Dehalogenase The number of Dichloromethane Dehalogenase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Dehalobium chlorocoercia The number of Dehalobium chlorocoercia cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 9150 10100 cells per bead Dehalobacter spp. The number of Dehalobacter spp. cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Dehalococcoides The number of Dehalococcoides cells per bead. Less than values are below the detection limit. USGS Defined 33.2 38500 cells per bead Dehalogenimonas spp. The number of Dehalogenimonas spp. cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 144000 144000 cells per bead Desulfitobacterium spp. The number of Desulfitobacterium spp. cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Desulfuromonas spp. The number of Desulfuromonas spp. cells per bead. Less than values are below the detection limit. USGS Defined 1650 2670 cells per bead Total Eubacteria The number of Total Eubacteria cells per bead. Less than values are below the detection limit. USGS Defined 3820000 42700000 cells per bead Ethene Monooxygenase The number of Ethene Monooxygenase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Epoxyalkane Transferase The number of Epoxyalkane Transferase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Methanogens The number of Methanogen cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 10.7 3450 cells per bead Methanogens_QA Quality assurance information associated with Methanogen cells. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "J" stands for estimated gene copies. PCE Reductase The number of PCE Reductase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Phenol Hydroxylase The number of Phenol Hydroxylase cells per bead. USGS Defined 4130 12000 cells per bead Toluene Monooxygenase2 The number of Toluene Monooxygenase 2 cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 5310 5310 cells per bead Toluene Monooxygenase The number of Toluene Monooxygenase cells per bead. USGS Defined 591 1860 cells per bead Soluble Methane Monooxygenase The number of Soluble Methane Monooxygenase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Trichlorobenzene Dioxygenase The number of Trichlorobenzene Dioxygenase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. tceA Reductase The number of tceA Reductase cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 1100 1100 cells per bead trans-1,2-DCE reductase The number of trans-1,2-DCE reductase cells per bead. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. USGS Defined 103000 103000 cells per bead Toluene Dioxygenase The number of Toluene Dioxygenase cells per bead. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in cells per bead. Vinyl Chloride Reductase The number of Vinyl Chloride Reductase cells per bead. Less than values are below the detection limit. USGS Defined 12.4 11700 cells per bead Vinyl Chloride Reductase_QA Quality assurance information associated with Vinyl Chloride Reductase cells. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "J" stands for estimated gene copies. FtD_All_Constituents_NA_2019.csv Comma Separated Value (CSV) file containing oxidation-reduction data from passive samplers in groundwater in 2019 to assess natural attenuation (NA). USGS Defined Sample_Name Sample location. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one sample location. Sample names with "Rep" indicate a field replicate was collected. Sample_ID Unique identification number for the sample. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one sample location. These are represented by .1/.2/.1R/.2R etc. A sample ID with "R" indicates a field replicate was collected. Collection_Date Date passive sampler was collected from the field. USGS Defined 10/28/2019 10/29/2019 NVDOC Dissolved organic carbon. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.38 42.9 milligrams per liter of carbon Alkalinity Alkalinity. USGS Defined NC Sample was not collected for analysis. USGS Defined 67.12 523.5 milligrams per liter of bicarbonate F Concentration of Fluorine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.24 0.24 milligrams per liter Cl Concentration of Chlorine. USGS Defined NC Sample was not collected for analysis. USGS Defined 4.74 59.4 milligrams per liter Br Concentration of Bromine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.21 0.41 milligrams per liter NO3 Concentration of Nitrate. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.2 22.3 milligrams per liter PO4 Concentration of Phosphate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. SO4 Concentration of Sulfate. USGS Defined NC Sample was not collected for analysis. USGS Defined 4.39 83.7 milligrams per liter Ca Concentration of Calcium. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.615 135 milligrams per liter Na Concentration of Sodium. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.39 91 milligrams per liter Mg Concentration of Magnesium. USGS Defined NC Sample was not collected for analysis. USGS Defined 2.28 36.7 milligrams per liter K Concentration of Potassium. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.09 19.3 milligrams per liter Si Concentration of Silicon. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.92 11 milligrams per liter Sr Concentration of Strontium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 20.1 491 micrograms per liter Al Concentration of Aluminum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 51 118 micrograms per liter Fe Concentration of Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 43.9 2200 micrograms per liter Mn Concentration of Manganese. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 21.7 1050 micrograms per liter B Concentration of Boron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 22.3 39 micrograms per liter Ba Concentration of Barium. USGS Defined NC Sample was not collected for analysis. USGS Defined 22.4 393.6 micrograms per liter Li Concentration of Lithium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.32 28.1 micrograms per liter Cu Concentration of Copper. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 8.73 486 micrograms per liter Zn Concentration of Zinc. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 23.5 119 micrograms per liter Be Concentration of Beryllium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. V Concentration of Vanadium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 23.8 25.2 micrograms per liter Cr Concentration of Chromium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 6.76 7.13 micrograms per liter Co Concentration of Cobalt. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ni Concentration of Nickel. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.03 364 micrograms per liter As Concentration of Arsenic. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Se Concentration of Selenium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Mo Concentration of Molybdenum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 11.7 39.5 micrograms per liter Ag Concentration of Silver. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cd Concentration of Cadmium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Sb Concentration of Antimony. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tl Concentration of Thallium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Pb Concentration of Lead. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. U Concentration of Uranium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Lactate Concentration of Lactate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.94 1.94 milligrams per liter Acetate Concentration of Acetate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.8 4.93 milligrams per liter Propionate Concentration of Propionate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 3.04 6.93 milligrams per liter Formate Concentration of Formate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.2 0.77 milligrams per liter Butyrate Concentration of Butyrate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Pyruvate Concentration of Pyruvate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Benzoate Concentration of Benzoate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 3.02 3.02 milligrams per liter CH4 Concentration of Methane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 52.94 56.82 micrograms per liter C2H4 Concentration of Ethylene. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H6 Concentration of Ethane. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe2+ Concentration of Ferrous Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.1 2.4 milligrams per liter Fe_Total Concentration of Total Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.1 2.8 milligrams per liter S2 Concentration of Sulfide. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 186 186 milligrams per liter NH3 Concentration of Ammonia. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.019 0.575 milligrams per liter FtD_All_Constituents_NA_2020.csv Comma Separated Value (CSV) file containing oxidation-reduction (redox) data in passive samplers in groundwater collected in 2020 to assess natural attenuation (NA). For constituents that met all quality assurance criteria or are not qualified, no columns with qualifiers are included in the file. USGS Defined Sample_Name Sample location. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one sample location. Sample names with "Rep" indicate a field replicate was collected. Sample_ID Unique identification number for the sample. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one sample location. These are represented by .1/.2/.1R/.2R etc. A sample ID with "R" indicates a field replicate was collected. Collection_Date Date passive sampler was collected from the field. USGS Defined 6/23/2020 6/24/2020 NVDOC Dissolved organic carbon. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.13 41.1 milligrams per liter of Carbon Alkalinity Alkalinity. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter of Bicarbonate. USGS Defined NC Sample was not collected for analysis. USGS Defined 169 942 milligrams per liter of Bicarbonate F Concentration of Fluorine. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Cl Concentration of Chlorine. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.9 57.6 milligrams per liter Br Concentration of Bromine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.123 0.721 milligrams per liter NO3 Concentration of Nitrate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.42 19.9 milligrams per liter PO4 Concentration of Phosphate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. SO4 Concentration of Sulfate. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.07 534 milligrams per liter Ca Concentration of Calcium. USGS Defined NC Sample was not collected for analysis. USGS Defined 2.37 208 milligrams per liter Na Concentration of Sodium. USGS Defined NC Sample was not collected for analysis. USGS Defined 3.45 460 milligrams per liter Mg Concentration of Magnesium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 2.9 30.6 milligrams per liter K Concentration of Potassium. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.07 38.7 milligrams per liter Si Concentration of Silicon. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.659 7.44 milligrams per liter Sr Concentration of Strontium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 33.1 5440 micrograms per liter Al Concentration of Aluminum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 63.8 140 micrograms per liter Fe Concentration of Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 20.4 5100 micrograms per liter Mn Concentration of Manganese. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 20.5 474 micrograms per liter B Concentration of Boron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 21 145 micrograms per liter Ba Concentration of Barium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 42.3 317 micrograms per liter Li Concentration of Lithium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 6.68 134 micrograms per liter Cu Concentration of Copper. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Zn Concentration of Zinc. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 65 65 micrograms per liter Be Concentration of Beryllium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. V Concentration of Vanadium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cr Concentration of Chromium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 6.11 6.11 micrograms per liter Co Concentration of Cobalt. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.3 7.62 micrograms per liter Ni Concentration of Nickel. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.45 1440 micrograms per liter As Concentration of Arsenic. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Se Concentration of Selenium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Rb Concentration of Rubidium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 24.6 129 micrograms per liter Mo Concentration of Molybdenum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 8.96 29.6 micrograms per liter Ag Concentration of Silver. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cd Concentration of Cadmium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Sb Concentration of Antimony. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. La Concentration of Lanthanum. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ce Concentration of Cerium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tl Concentration of Thallium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Pb Concentration of Lead. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. U Concentration of Uranium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Lactate Concentration of Lactate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.271 3.22 milligrams per liter Acetate Concentration of Acetate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.554 11.3 milligrams per liter Acetate_QA Quality assurance information associated with Acetate concentrations. USGS Defined - No Qualifier USGS defined P Preservation Issue USGS defined Propionate Concentration of Propionate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.14 12.6 milligrams per liter Propionate_QA Quality assurance information associated with Propionate concentrations. USGS Defined - No Qualifier USGS defined P Preservation issue USGS defined Formate Concentration of Formate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.192 0.302 milligrams per liter Formate_QA Quality assurance information associated with Formate concentrations. USGS Defined - No Qualifier USGS defined P Preservation Issue USGS defined Butyrate Concentration of Butyrate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Butyrate_QA Quality assurance information associated with Butyrate concentrations. USGS Defined - No Qualifier USGS defined P Preservation Issue USGS defined Pyruvate Concentration of Pyruvate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Pyruvate_QA Quality assurance information associated with Pyruvate concentrations. USGS Defined - No Qualifier USGS defined P Preservation issue USGS defined Benzoate Concentration of Benzoate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.225 17.8 milligrams per liter Benzoate_QA Quality assurance information associated with Benzoate concentrations. USGS Defined - No Qualifier USGS defined P Preservation Issue USGS defined CH4 Concentration of Methane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 32.78 2460 micrograms per liter C2H4 Concentration of Ethylene. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H6 Concentration of Ethane. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe2+ Concentration of Ferrous Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.01 5.08 milligrams per liter Fe Total Concentration of Total Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.04 5.19 milligrams per liter NH3 Concentration of Ammonia. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.021 0.714 milligrams per liter FtD_All_Constituents_PW_2019.csv Comma Separated Value (CSV) file containing oxidation-reduction (redox) data in porewater samples collected in 2019. USGS Defined Sample_Name Sample location. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one site. Sample names with "Rep" indicate a field replicate was collected. Sample_ID Unique identification number for the sample. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one site. These are represented by .1/.2/.1R/.2R etc. A sample ID with "R" indicates a field replicate was collected. Collection_Date Date passive sampler was collected from the field. USGS Defined 8/21/2019 8/21/2019 NVDOC Dissolved organic carbon. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.78 25.7 milligrams per liter of Carbon Alkalinity Alkalinity. USGS Defined NC Sample was not collected for analysis. USGS Defined 203 315 milligrams per liter of Bicarbonate NH3-N Concentration of Ammonia. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.05 0.527 milligrams per liter of Nitrogen F Concentration of Fluorine. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Cl Concentration of Chlorine. USGS Defined 26.4 63.6 milligrams per liter Br Concentration of Bromine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined 0.12 0.292 milligrams per liter NO3 Concentration of Nitrate. USGS Defined 0.336 21.6 milligrams per liter PO4 Concentration of Phosphate. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. SO4 Concentration of Sulfate. USGS Defined 9.08 23.2 milligrams per liter Ca Concentration of Calcium. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 48 94.5 milligrams per liter Na Concentration of Sodium. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 8.2 25.3 milligrams per liter Mg Concentration of Magnesium. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 10.2 16.5 milligrams per liter K Concentration of Potassium. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 0.87 2.49 milligrams per liter Si Concentration of Silicon. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 2.81 6.5 milligrams per liter Sr Concentration of Strontium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 80.5 339 micrograms per liter Al Concentration of Aluminum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 10.3 46.3 micrograms per liter Fe Concentration of Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 104 246 micrograms per liter Mn Concentration of Manganese. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 0.69 1880 micrograms per liter B Concentration of Boron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 88.7 92.6 micrograms per liter Ba Concentration of Barium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 59.4 101 micrograms per liter Li Concentration of Lithium. Less than values are below the detection limit. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cu Concentration of Copper. Less than values are below the detection limit. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Zn Concentration of Zinc. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. The qualifier "M" indicates that the sample was run on the ICP-OES due to insufficient volume to run on the ICP-MS. USGS Defined 10.8 251 micrograms per liter Be Concentration of Beryllium. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. V Concentration of Vanadium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 0.51 0.62 micrograms per liter Cr Concentration of Chromium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 0.51 2.47 micrograms per liter Co Concentration of Cobalt. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 0.92 7.3 micrograms per liter Ni Concentration of Nickel. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 1.02 421 micrograms per liter As Concentration of Arsenic. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Se Concentration of Selenium. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Mo Concentration of Molybdenum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined 0.84 26 micrograms per liter Ag Concentration of Silver. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cd Concentration of Cadmium. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Sb Concentration of Antimony. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tl Concentration of Thallium. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Pb Concentration of Lead. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. U Concentration of Uranium. Less than values are below the detection limit. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Lactate Concentration of Lactate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.74 0.8 milligrams per liter Acetate Concentration of Acetate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 4.42 9.28 milligrams per liter Propionate Concentration of Propionate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.96 12.4 milligrams per liter Formate Concentration of Formate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.49 0.49 milligrams per liter Butyrate Concentration of Butyrate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Pyruvate Concentration of Pyruvate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Benzoate Concentration of Benzoate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. CH4 Concentration of Methane. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H4 Concentration of Ethylene. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H6 Concentration of Ethane. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe 2+ Concentration of Ferrous Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.1 0.2 milligrams per liter Fe Total Concentration of Total Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined - No data available. Sample was collected, but not analyzed for the specific constituent. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.1 1.3 milligrams per liter S2 Concentration of Sulfide. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. NH3 Concentration of Ammonia. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.015 0.11 milligrams per liter FtD_All_Constituents_PW_2020.csv Comma Separated Value (CSV) file containing oxidation-reduction (redox) data in porewater samples collected in 2020. USGS Defined Sample_Name Sample location. USGS Defined Each sample is named according to the origin of the collected groundwater. Names are unique per sample, but in some cases several samples were collected from one site. Sample names with "Rep" indicate a field replicate was collected. Sample_ID Unique identification number for the sampled site. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample, but in some cases several samples were collected from one site. These are represented by .1/.2/.1R/.2R etc. A sample ID with "R" indicates a field replicate was collected. Collection_Date Date passive sampler was collected from the field. USGS Defined 8/6/2020 9/22/2020 NVDOC Dissolved organic carbon. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.64 6.84 milligrams per liter of Carbon Alkalinity Alkalinity. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter of Bicarbonate. USGS Defined NC Sample was not collected for analysis. USGS Defined 231 296 milligrams per liter of Bicarbonate F Concentration of Fluorine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.555 4.15 milligrams per liter Cl Concentration of Chlorine. USGS Defined NC Sample was not collected for analysis. USGS Defined 2.41 67.3 milligrams per liter Br Concentration of Bromine. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.107 0.138 milligrams per liter NO3 Concentration of Nitrate. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.413 29.4 milligrams per liter PO4 Concentration of Phosphate. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. SO4 Concentration of Sulfate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.448 89.9 milligrams per liter Ca Concentration of Calcium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 59.2 81.4 milligrams per liter Na Concentration of Sodium. USGS Defined NC Sample was not collected for analysis. USGS Defined 4.24 38.6 milligrams per liter Mg Concentration of Magnesium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 12.5 17.3 milligrams per liter K Concentration of Potassium. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.28 4.62 milligrams per liter Si Concentration of Silicon. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 3.61 9.06 milligrams per liter Sr Concentration of Strontium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 33.6 199 micrograms per liter Al Concentration of Aluminum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 72.5 172 micrograms per liter Fe Concentration of Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 20.3 674 micrograms per liter Mn Concentration of Manganese. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 71.2 1110 micrograms per liter B Concentration of Boron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 21.1 549 micrograms per liter Ba Concentration of Barium. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 22.6 189 micrograms per liter Li Concentration of Lithium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cu Concentration of Copper. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.1 9.1 micrograms per liter Zn Concentration of Zinc. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 22 129 micrograms per liter Be Concentration of Beryllium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. V Concentration of Vanadium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cr Concentration of Chromium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Co Concentration of Cobalt. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ni Concentration of Nickel. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. As Concentration of Arsenic. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Se Concentration of Selenium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Rb Concentration of Rubidium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Mo Concentration of Molybdenum. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 5.82 17.1 micrograms per liter Ag Concentration of Silver. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Cd Concentration of Cadmium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Sb Concentration of Antimony. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. La Concentration of Lanthanum. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ce Concentration of Cerium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tl Concentration of Thallium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Pb Concentration of Lead. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. U Concentration of Uranium. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Lactate Concentration of Lactate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.494 0.494 milligrams per liter Acetate Concentration of Acetate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined 3.06 5.02 milligrams per liter Propionate Concentration of Propionate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined 1.32 1.32 milligrams per liter Formate Concentration of Formate. Less than values are below the detection limit. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Butyrate Concentration of Butyrate. Less than values are below the detection limit. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Pyruvate Concentration of Pyruvate. Less than values are below the detection limit. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Benzoate Concentration of Benzoate. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. The qualifier "P" stands for Preservation Issue. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.647 0.647 milligrams per liter CH4 Concentration of Methane. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 28.1 73.61 micrograms per liter C2H4 Concentration of Ethylene. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. C2H6 Concentration of Ethane. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Fe 2+ Concentration of Ferrous Iron. Less than values are below the detection limit. USGS Defined NC Sample was not collected for analysis. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. Fe Total Concentration of Total Iron. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.01 1.2 milligrams per liter NH3 Concentration of Ammonia. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in milligrams per liter. USGS Defined NC Sample was not collected for analysis. USGS Defined 0.015 0.745 milligrams per liter FtD_Concentrations_in_Rock_Matrix_VOC_2020.csv Comma Separated Value (CSV) file containing calculated volatile organic compound (VOC) concentrations in rock matrix, based on methanol extract concentration data. USGS Defined Methanol_Aliquot_Collection_Date Date of sampling, when 0.5 milliliter methanol aliquots were removed for sampling and diluted in water (1:10, Methanol:Ultrapure water) at various periods in time. USGS Defined 1/25/2020 7/9/2020 Sample_Bottle_Name Name of sample bottle from which samples were collected for analysis and calculation of VOCs in rock matrix. The sample name includes the monitoring location where the sample was collected and the depth interval (in feet) of the rock core. USGS Defined Unique samples are assigned a unique sample bottle name based on where they were collected from, along with additional information, such as the depth (numerical range, in feet) of rock core retrieved. The date at the end of the sample name is the start date of the experiment, when rock core samples were initially placed in methanol. Sample_ID Unique identification number for the sample bottle. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample bottle. Dichlorodifluoromethane Calculated concentration of Dichlorodifluoromethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below detection limits. Vinyl.Chloride Calculated concentration of Vinyl Chloride in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. Trichlorofluoromethane Calculated concentration of Trichlorofluoromethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. 1,1-Dichloroethylene Calculated concentration of 1,1-Dichloroethylene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. trans-1,2-Dichloroethylene Calculated concentration of trans-1,2-Dichloroethylene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 7.75 68.14 micrograms per kilogram 1,1-Dichloroethane Calculated concentration of 1,1-Dichloroethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. cis-1,2-Dichloroethylene Calculated concentration of cis-1,2-Dichloroethylene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 7.45 8.54 micrograms per kilogram Chloroform Calculated concentration of Chloroform in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. 1,1,1-Trichloroethane Calculated concentration of 1,1,1-Trichloroethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined No values were calculated for this constituent. All concentrations in methanol were below the detection limit. 1,2-Dichloroethane Calculated concentration of 1,2-Dichloroethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 6.01 6.01 micrograms per kilogram Trichloroethylene Calculated concentration of Trichloroethylene in rock, based on methanol extract concentration data. USGS Defined 8.01 394.39 micrograms per kilogram Toluene Calculated concentration of Toluene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 7.75 24.04 micrograms per kilogram Chlorobenzene Calculated concentration of Chlorobenzene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 33.12 50.59 micrograms per kilogram M&P-Xylene Calculated concentration of M&P-Xylene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 14.81 18.68 micrograms per kilogram Styrene Calculated concentration of Styrene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 6.94 7.91 micrograms per kilogram 1,1,2,2-Tetrachloroethane Calculated concentration of 1,1,2,2-Tetrachloroethane in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 7.22 356.6 micrograms per kilogram Isopropyltoluene Calculated concentration of Isopropyltoluene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 18.79 24.87 micrograms per kilogram 1,4-Dichlorobenzene Calculated concentration of 1,4-Dichlorobenzene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 30.85 107.01 micrograms per kilogram 1,2,4-Trimethylbenzene Calculated concentration of 1,2,4-Trimethylbenzene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 9.86 12.41 micrograms per kilogram 1,2-Dichlorobenzene Calculated concentration of 1,2-Dichlorobenzene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 15.11 54.74 micrograms per kilogram 1,2,4-Trichlorobenzene Calculated concentration of 1,2,4-Trichlorobenzene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 6.55 6.55 micrograms per kilogram Naphthalene Calculated concentration of Naphthalene in rock, based on methanol extract concentration data. USGS Defined NC Not calculated, concentration in methanol was below the detection limit. USGS Defined 6.14 9.9 micrograms per kilogram FtD_MeOH_Extract_VOC_2020.csv Comma Separated Value (CSV) file containing volatile organic compound (VOC) concentrations data of methanol extracts of rock core samples analyzed in 2020. Constituents that met all quality assurance criteria were not qualified and do not contain columns for qualifiers in the file. USGS Defined Methanol_Aliquot_Collection_Date Date of sampling, when 0.5 milliliter methanol aliquots were removed for sampling and diluted in water (1:10, Methanol:Ultrapure water) at various periods in time. USGS Defined 1/24/2020 7/10/2020 Sample_Bottle_Name Name of sample bottle from which the methanol aliquot was collected. The sample bottle name includes the monitoring location and the depth (numerical range, in feet) from the rock core. USGS Defined Unique samples are assigned a unique sample name based on the sample bottle from which the methanol aliquot was collected. The sample bottle name includes the monitoring location and the depth (numerical range, in feet) from the rock core. Sample bottle names with "Fridge Blank" indicate an aliquot of methanol was collected and analyzed from a bottle of methanol that was stored with samples during the experiment, either sealed or unsealed (open). The date at the end of the sample name is the start date of the experiment, when rock core samples were initially placed in methanol. Sample_ID Unique identification number for the sample bottle. USGS Defined Each sample is given an identification number that corresponds with the sample name. ID's are unique per sample bottle, but in some cases several samples were collected from one sample bottle. These are represented by .1 and .2. Dichlorodifluoromethane Concentration of Dichlorodifluoromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloromethane Concentration of Chloromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Vinyl.Chloride Concentration of Vinyl Chloride in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromomethane Concentration of Bromomethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroethane Concentration of Chloroethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Trichlorofluoromethane Concentration of Trichlorofluoromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloroethylene Concentration of 1,1-Dichloroethylene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Methylene.Chloride Concentration of Methylene Chloride in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. trans-1,2-Dichloroethylene Concentration of trans-1,2-Dichloroethylene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.45 57.76 micrograms per liter 1,1-Dichloroethane Concentration of 1,1-Dichloroethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,2-Dichloroethylene Concentration of cis-1,2-Dichloroethylene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.5 7.27 micrograms per liter 2,2-Dichloropropane Concentration of 2,2-Dichloropropane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromochloromethane Concentration of Bromochloromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chloroform Concentration of Chloroform in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,1-Trichloroethane Concentration of 1,1,1-Trichloroethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1-Dichloropropene Concentration of 1,1-Dichloropropene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Carbon.Tetrachloride Concentration of Carbon Tetrachloride in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Benzene Concentration of Benzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dichloroethane Concentration of 1,2-Dichloroethane in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.09 5.09 micrograms per liter Trichloroethylene Concentration of Trichloroethylene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 7.73 334.29 micrograms per liter 1,2-Dichloropropane Concentration of 1,2-Dichloropropane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromomethane Concentration of Dibromomethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromodichloromethane Concentration of Bromodichloromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. cis-1,3-Dichloropropene Concentration of cis-1,3-Dichloropropene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Toluene Concentration of Toluene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 6.62 20.7 micrograms per liter trans-1,3-Dichloropropene Concentration of trans-1,3-Dichloropropene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2-Trichloroethane Concentration of 1,1,2-Trichloroethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Tetrachloroethylene Concentration of Tetrachloroethylene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3-Dichloropropane Concentration of 1,3-Dichloropropane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Dibromochloromethane Concentration of Dibromochloromethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2-Dibromoethane Concentration of 1,2-Dibromoethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Chlorobenzene Concentration of Chlorobenzene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 28.28 43.56 micrograms per liter 1,1,1,2-Tetrachloroethane Concentration of 1,1,1,2-Tetrachloroethane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Ethylbenzene Concentration of Ethylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. M&P-Xylene Concentration of M&P-Xylene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 12.37 16.09 micrograms per liter O-Xylene Concentration of O-Xylene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Styrene Concentration of Styrene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.8 6.81 micrograms per liter Bromoform Concentration of Bromoform in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromoform_QA Quality assurance information associated with Bromoform concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). Isopropylbenzene Concentration of Isopropylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Bromobenzene Concentration of Bromobenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,1,2,2-Tetrachloroethane Concentration of 1,1,2,2-Tetrachloroethane in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.66 307.08 micrograms per liter 1,2,3-Trichloropropane Concentration of 1,2,3-Trichloropropane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Propylbenzene Concentration of n-Propylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 2-Chlorotoluene Concentration of 2-Chlorotoluene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 4-Chlorotoluene Concentration of 4-Chlorotoluene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene Concentration of tert-Butylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. tert-Butylbenzene_QA Quality assurance information associated with tert-Butylbenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). 1,3,5-Trimethylbenzene Concentration of 1,3,5-Trimethylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,3,5-Trimethylbenzene_QA Quality assurance information associated with 1,3,5-Trimethylbenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). sec-Butylbenzene Concentration of sec-Butylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. sec-Butylbenzene_QA Quality assurance information associated with sec-Butylbenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). 1,3-Dichlorobenzene Concentration of 1,3-Dichlorobenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Isopropyltoluene Concentration of Isopropyltoluene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 15.7 21.42 micrograms per liter Isopropyltoluene_QA Quality assurance information associated with Isopropyltoluene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). 1,4-Dichlorobenzene Concentration of 1,4-Dichlorobenzene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 25.41 90.7 micrograms per liter 1,2,4-Trimethylbenzene Concentration of 1,2,4-Trimethylbenzene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 8.24 10.69 micrograms per liter 1,2,4-Trimethylbenzene_QA Quality assurance information associated with 1,2,4-Trimethylbenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). n-Butylbenzene Concentration of n-Butylbenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. n-Butylbenzene_QA Quality assurance information associated with n-Butylbenzene concentrations. Concentrations with a qualifier will have a letter code in this field that signifies at least one sample did not fully meet all quality assurance criteria. Concentrations without a qualifier will have "-" in this field. USGS Defined - No qualifier exists for data result. USGS Defined The qualifier "H" indicates possible positive bias, based on an elevated response for this compound in the associated analysis run according to the method described in Majcher and others (2007). 1,2-Dichlorobenzene Concentration of 1,2-Dichlorobenzene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 12.85 45.73 micrograms per liter 1,2-Dibromo-3-Chloropropane Concentration of 1,2-Dibromo-3-Chloropropane in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. 1,2,4-Trichlorobenzene Concentration of 1,2,4-Trichlorobenzene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.47 5.47 micrograms per liter Hexachlorobutadiene Concentration of Hexachlorobutadiene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. Naphthalene Concentration of Naphthalene in methanol. Less than values are below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. USGS Defined 5.36 8.27 micrograms per liter 1,2,3-Trichlorobenzene Concentration of 1,2,3-Trichlorobenzene in methanol. Less than values are below the detection limit. USGS Defined All collected samples were below the detection limit. The detection limit is indicated by the numeric value to the right of the less than symbol. This detection limit is in micrograms per liter. GS ScienceBase U.S. Geological Survey mailing address

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9TV3Z2K None 20250415 Ellie P Foss U.S. Geological Survey, NORTHEAST REGION Physical Scientist mailing address

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