<?xml version='1.0' encoding='UTF-8'?>
<metadata xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <idinfo>
    <citation>
      <citeinfo>
        <origin>Mitchell A McAdoo</origin>
        <origin>Douglas B Chambers</origin>
        <origin>Christopher A Mason</origin>
        <origin>Samuel A Miller</origin>
        <origin>John D Jastram</origin>
        <pubdate>20221103</pubdate>
        <title>Environmental Sampling of Per- and Polyfluoroalkyl Substances in the Middle Chickahominy River Watershed, Virginia, 2021-2022 (ver. 2.0, September 2023)</title>
        <geoform>Tabular digital data</geoform>
        <pubinfo>
          <pubplace>Reston, VA</pubplace>
          <publish>U.S. Geological Survey</publish>
        </pubinfo>
        <onlink>https://doi.org/10.5066/P9LCSF2J</onlink>
      </citeinfo>
    </citation>
    <descript>
      <abstract>These data were collected to understand the occurrence of per- and polyfluoroalkyl substances (PFAS) in the middle Chickahominy River watershed. Specifically, this effort was initiated to: 
1. Determine concentrations of PFAS in surface water at select locations in the middle Chickahominy River watershed; 
2. Determine concentrations of PFAS in edible portions of fish at select locations in the middle Chickahominy River watershed; 
3. Determine concentrations of PFAS in bed sediment at select locations in the middle Chickahominy River watershed; and 
4. Quality Assure all data collected in accordance with USGS policies and publicly release those data as a citable USGS Data Series. 
These data are available in four Excel (.xlsx) files that contain water-quality and quality-assurance results. The Excel files are duplicated as tab-delimited text files to increase accessibility to nonproprietary formats. The files titled Middle_Chickahominy_Fish_Tissue_Results contain analytical results for PFAS in tissue samples collected from various fish species at different locations. The files titled Middle_Chickahominy_Sediment_Results contain analytical results for PFAS in sediments collected at four locations in the watershed. The files titled Middle_Chickahominy_Surface_Water_Results contain analytical results for PFAS in surface water collected at eleven locations in the watershed.
These files also contain associated field blanks, lab blanks, and replicates used for quality control. Lab blanks are used to assess contamination imparted by the analytical process. Field blanks were collected using certified analyte-free water at the sampling point and used to assess possible cross contamination from sampling materials and sampling technique in the field. Field replicates were collected concurrently with the environmental sample and used to understand the variability of results.  
The attached XML file titled Middle_Chickahominy_Metadata contains metadata explaining the provenance of the data and should be thoroughly read to understand data structure and limitations. The files titled Data_Dictionary may be used as a reference to explain codes, terms, and abbreviations used in these datasets. The files titled Ongoing_Precision_and_Recovery contain quality assurance samples reported by the lab which establishes additional confidence in results over time.</abstract>
      <purpose>The purpose of these data is to verify existing information and understand the occurrence of per- and polyfluoroalkyl substances in the middle Chickahominy River watershed in the context of potential human exposure.</purpose>
    </descript>
    <timeperd>
      <timeinfo>
        <rngdates>
          <begdate>20211116</begdate>
          <enddate>20211221</enddate>
        </rngdates>
      </timeinfo>
      <current>ground condition</current>
    </timeperd>
    <status>
      <progress>Complete</progress>
      <update>As needed</update>
    </status>
    <spdom>
      <bounding>
        <westbc>-77.3584318254143</westbc>
        <eastbc>-76.927218446508</eastbc>
        <northbc>37.363612315009</northbc>
        <southbc>37.5413144748221</southbc>
      </bounding>
    </spdom>
    <keywords>
      <theme>
        <themekt>USGS Thesaurus</themekt>
        <themekey>water quality</themekey>
        <themekey>per- and polyfluoroalkyl substances</themekey>
        <themekey>PFAS</themekey>
      </theme>
      <theme>
        <themekt>USGS Metadata Identifier</themekt>
        <themekey>USGS:62965dfad34ec53d276bb1b3</themekey>
      </theme>
      <place>
        <placekt>Geographic Names Information System (GNIS)</placekt>
        <placekey>Chickahominy River</placekey>
        <placekey>Virginia</placekey>
      </place>
    </keywords>
    <accconst>none</accconst>
    <useconst>none</useconst>
    <ptcontac>
      <cntinfo>
        <cntperp>
          <cntper>McAdoo, Mitchell A.</cntper>
          <cntorg>North Atlantic Appalachian Region: Virginia and West Virginia Water Science Center</cntorg>
        </cntperp>
        <cntpos>Hydrologist</cntpos>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>11 Dunbar St</address>
          <city>Charleston</city>
          <state>WV</state>
          <postal>25301</postal>
          <country>US</country>
        </cntaddr>
        <cntvoice>304-347-5130</cntvoice>
        <cntemail>mmcadoo@usgs.gov</cntemail>
      </cntinfo>
    </ptcontac>
  </idinfo>
  <dataqual>
    <attracc>
      <attraccr>No formal attribute accuracy tests were conducted</attraccr>
    </attracc>
    <logic>No formal logical accuracy tests were conducted</logic>
    <complete>Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.</complete>
    <posacc>
      <horizpa>
        <horizpar>No formal positional accuracy tests were conducted</horizpar>
      </horizpa>
      <vertacc>
        <vertaccr>No formal positional accuracy tests were conducted</vertaccr>
      </vertacc>
    </posacc>
    <lineage>
      <procstep>
        <procdesc>Data were received from the analytical laboratory SGS-AXYS by the U.S. Geological Survey (USGS) National Water Quality Laboratory's primary contract laboratory RTI. Data were coded according to standard USGS reporting procedures. Data were delivered to the USGS Virginia and West Virginia Water science center for review and approval. After review, data were uploaded to science base as excel files and tab delimited text files.</procdesc>
        <procdate>20220615</procdate>
      </procstep>
    </lineage>
  </dataqual>
  <eainfo>
    <detailed>
      <enttyp>
        <enttypl>Middle_Chickahominy_Surface_Water_Results</enttypl>
        <enttypd>Excel file and text file containing attribute information associated with the data set.</enttypd>
        <enttypds>Producer defined</enttypds>
      </enttyp>
      <attr>
        <attrlabl>Sample_ID</attrlabl>
        <attrdef>The sample ID assigned by the contract laboratory</attrdef>
        <attrdefs>user defined</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>2202111-1</rdommin>
            <rdommax>2202086-16</rdommax>
            <attrunit>alphanumeric</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_ID</attrlabl>
        <attrdef>USGS site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>02042440</rdommin>
            <rdommax>0204271247</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_Name</attrlabl>
        <attrdef>Site name established for the Site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <udom>Text describing the site location</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Latitude</attrlabl>
        <attrdef>Latitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>37.41406</rdommin>
            <rdommax>37.55208985</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Longitude</attrlabl>
        <attrdef>Longitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>-77.0162</rdommin>
            <rdommax>-77.27108798</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Date_Time</attrlabl>
        <attrdef>Date and time the sample was collected</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>202112201210</rdommin>
            <rdommax>202112211045</rdommax>
            <attrunit>yyyymmddhhmm</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Medium_code</attrlabl>
        <attrdef>Medium Code for the Sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>WS</edomv>
            <edomvd>Surface water - Regular Environmental Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>OAQ</edomv>
            <edomvd>Blank - Surface water Quality Assuarance Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Type</attrlabl>
        <attrdef>Code used to distinguish the type of sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>Regular</edomv>
            <edomvd>A regular sample collected in the field</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>Field Blank</edomv>
            <edomvd>A blank sample collected in the field.</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Collection_Agency</attrlabl>
        <attrdef>Agency responsible for the collection of the sample.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>USGS</edomv>
            <edomvd>U.S. Geological Survey</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanoate (PFBA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanoate (PFPeA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanoate (PFHxA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanoate (PFHpA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanoate (PFOA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanoate (PFNA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanoate (PFDA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFUnA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroundecanoate (PFUnDA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanoate (PFDoDA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTrDA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotridecanoate (PFTrDA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTeDA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotetradecanoate (PFTeDA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanesulfonate (PFBS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanesulfonate (PFPeS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanesulfonate (PFHxS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanesulfonate (PFHpS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonate (PFOS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanesulfonate (PFNS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanesulfonate (PFDS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanesulfonate (PFDoDS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>4:2 FTS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 4:2 Fluorotelomersulfonate (4:2 FTS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>6:2 FTS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 6:2 Fluorotelomersulfonate (6:2 FTS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>8:2 FTS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 8:2 Fluorotelomersulfonate (8:2 FTS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOSA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonamide (PFOSA, also called FOSA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamide (N-MeFOSA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamide (N-EtFOSA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>MeFOSAA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoacetate (N-MeFOSAA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>EtFOSAA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoacetate (N-EtFOSAA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSE_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoethanol (N-MeFOSE), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSE_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoethanol (N-EtFOSE), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>HFPO-DA_nanograms per liter</attrlabl>
        <attrdef>Perfluoro-2-propoxypropanoate (HFPO-DA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>ADONA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 4,8-Dioxa-3H-perfluorononanoate (ADONA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>9Cl-PF3ONS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonate (9Cl-PF3ONS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>11Cl-PF3OUdS_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonate (11Cl-PF3OUdS), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>3:3 FTCA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoropropyl propanoic acid (3:3 FTCA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>5:3 FTCA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>7:3 FTCA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoroheptyl propanoic acid (7:3 FTCA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFEESA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMPA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-3-methoxypropanoic acid (PFMPA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMBA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-4-methoxybutanoic acid (PFMBA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>NFDHA_nanograms per liter</attrlabl>
        <attrdef>Numerical value representing the concentration of Nonafluoro-3,6-dioxaheptanoic acid (NFDHA), linear and branched, water, unfiltered, recoverable, nanograms per liter</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per liter</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFBA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C4]butanoic acid (13C4-PFBA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFPeA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C5]pentanoic acid (13C5-PFPeA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFHxA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,6-13C5]hexanoic acid (13C5-PFHxA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFHpA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4-13C4]heptanoic acid (13C4-PFHpA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C8]octanoic acid (13C8-PFOA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C9-PFNA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C9]nonanoic acid (13C9-PFNA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C6-PFDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6-13C6]decanoic acid (13C6-PFDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C7-PFUnA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6,7-13C7]undecanoic acid (13C7-PFUnA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFDoA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]dodecanoic acid (13C2-PFDoA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFTeDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]tetradecanoic acid (13C2-PFTeDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFBS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[2,3,4-13C3]butanesulfonic acid (13C3-PFBS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFHxS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[1,2,3-13C3]hexanesulfonic acid (13C3-PFHxS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonic acid (13C8-PFOS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-4:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]hexanesulfonicacid (13C2-4:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-6:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]octanesulfonicacid (13C2-6:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-8:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]decanesulfonicacid (13C2-8:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonamide (13C8-PFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-N-MeFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamide (D3-N-MeFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-N-EtFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamide (D5-N-EtFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-MeFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamidoacetic acid (D3-MeFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-EtFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamidoacetic acid (D5-EtFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D7-NMe-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d7-perfluorooctanesulfonamidoethanol (D7-NMe-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D9-NEt-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d9-perfluorooctanesulfonamidoethanol (D9-NEt-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-HFPO-DA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Tetrafluoro-2-heptafluoropropoxy-13C3-propanoic acid (13C3-HFPO-DA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
    </detailed>
    <detailed>
      <enttyp>
        <enttypl>Middle_Chickahominy_Sediment_Results</enttypl>
        <enttypd>Excel file and text file containing attribute information associated with the data set.</enttypd>
        <enttypds>Producer defined</enttypds>
      </enttyp>
      <attr>
        <attrlabl>Sample_ID</attrlabl>
        <attrdef>The sample ID assigned by the contract laboratory</attrdef>
        <attrdefs>user defined</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>2202111-1</rdommin>
            <rdommax>2202086-16</rdommax>
            <attrunit>alphanumeric</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_ID</attrlabl>
        <attrdef>USGS site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>02042440</rdommin>
            <rdommax>0204271247</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_Name</attrlabl>
        <attrdef>Site name established for the Site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <udom>Text describing the site location</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Latitude</attrlabl>
        <attrdef>Latitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>37.41406</rdommin>
            <rdommax>37.55208985</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Longitude</attrlabl>
        <attrdef>Longitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>-77.0162</rdommin>
            <rdommax>-77.27108798</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Date_Time</attrlabl>
        <attrdef>Date and time the sample was collected</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>202112201210</rdommin>
            <rdommax>202112211045</rdommax>
            <attrunit>yyyymmddhhmm</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Medium_code</attrlabl>
        <attrdef>Medium Code for the Sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>SB</edomv>
            <edomvd>Sediment - Regular Environmental Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>SBQ</edomv>
            <edomvd>Replicate - Sediment Quality Assuarance Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Type</attrlabl>
        <attrdef>Code used to distinguish the type of sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>Regular</edomv>
            <edomvd>A regular sample collected in the field</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>Field Replicate</edomv>
            <edomvd>A replicate of the environmental sample take at the time of sampling.</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Collection_Agency</attrlabl>
        <attrdef>Agency responsible for the collection of the sample.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>USGS</edomv>
            <edomvd>U.S. Geological Survey</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanoate (PFBA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanoate (PFPeA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanoate (PFHxA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanoate (PFHpA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanoate (PFOA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanoate (PFNA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanoate (PFDA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFUnA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroundecanoate (PFUnDA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanoate (PFDoDA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTrDA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotridecanoate (PFTrDA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTeDA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotetradecanoate (PFTeDA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanesulfonate (PFBS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanesulfonate (PFPeS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanesulfonate (PFHxS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanesulfonate (PFHpS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonate (PFOS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanesulfonate (PFNS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanesulfonate (PFDS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanesulfonate (PFDoDS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>4:2 FTS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 4:2 Fluorotelomersulfonate (4:2 FTS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>6:2 FTS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 6:2 Fluorotelomersulfonate (6:2 FTS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>8:2 FTS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 8:2 Fluorotelomersulfonate (8:2 FTS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOSA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonamide (PFOSA, also called FOSA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamide (N-MeFOSA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamide (N-EtFOSA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>MeFOSAA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoacetate (N-MeFOSAA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>EtFOSAA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoacetate (N-EtFOSAA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSE_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoethanol (N-MeFOSE), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSE_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoethanol (N-EtFOSE), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>HFPO-DA_sediment_nanograms per gram</attrlabl>
        <attrdef>Perfluoro-2-propoxypropanoate (HFPO-DA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>ADONA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 4,8-Dioxa-3H-perfluorononanoate (ADONA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>9Cl-PF3ONS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonate (9Cl-PF3ONS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>11Cl-PF3OUdS_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonate (11Cl-PF3OUdS), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>3:3 FTCA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoropropyl propanoic acid (3:3 FTCA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>5:3 FTCA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>7:3 FTCA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoroheptyl propanoic acid (7:3 FTCA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFEESA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMPA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-3-methoxypropanoic acid (PFMPA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMBA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-4-methoxybutanoic acid (PFMBA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>NFDHA_sediment_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Nonafluoro-3,6-dioxaheptanoic acid (NFDHA), solids, dry weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFBA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C4]butanoic acid (13C4-PFBA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFPeA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C5]pentanoic acid (13C5-PFPeA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFHxA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,6-13C5]hexanoic acid (13C5-PFHxA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFHpA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4-13C4]heptanoic acid (13C4-PFHpA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C8]octanoic acid (13C8-PFOA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C9-PFNA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C9]nonanoic acid (13C9-PFNA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C6-PFDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6-13C6]decanoic acid (13C6-PFDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C7-PFUnA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6,7-13C7]undecanoic acid (13C7-PFUnA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFDoA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]dodecanoic acid (13C2-PFDoA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFTeDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]tetradecanoic acid (13C2-PFTeDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFBS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[2,3,4-13C3]butanesulfonic acid (13C3-PFBS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFHxS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[1,2,3-13C3]hexanesulfonic acid (13C3-PFHxS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonic acid (13C8-PFOS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-4:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]hexanesulfonicacid (13C2-4:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-6:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]octanesulfonicacid (13C2-6:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-8:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]decanesulfonicacid (13C2-8:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonamide (13C8-PFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-N-MeFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamide (D3-N-MeFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-N-EtFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamide (D5-N-EtFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-MeFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamidoacetic acid (D3-MeFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-EtFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamidoacetic acid (D5-EtFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D7-NMe-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d7-perfluorooctanesulfonamidoethanol (D7-NMe-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D9-NEt-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d9-perfluorooctanesulfonamidoethanol (D9-NEt-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-HFPO-DA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Tetrafluoro-2-heptafluoropropoxy-13C3-propanoic acid (13C3-HFPO-DA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
    </detailed>
    <detailed>
      <enttyp>
        <enttypl>Middle_Chickahominy_Fish_Tissue_Results</enttypl>
        <enttypd>Excel file and text file containing attribute information associated with the data set.</enttypd>
        <enttypds>Producer defined</enttypds>
      </enttyp>
      <attr>
        <attrlabl>Sample_ID</attrlabl>
        <attrdef>The sample ID assigned by the contract laboratory</attrdef>
        <attrdefs>user defined</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>2202111-1</rdommin>
            <rdommax>2202086-16</rdommax>
            <attrunit>alphanumeric</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_ID</attrlabl>
        <attrdef>USGS site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>02042440</rdommin>
            <rdommax>0204271247</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Site_Name</attrlabl>
        <attrdef>Site name established for the Site ID in the National Water Information System</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <udom>Text describing the site location</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>VADEQ_Site_Name</attrlabl>
        <attrdef>Site name established for the Site ID by the Virginia Department of Environmental Quality</attrdef>
        <attrdefs>VADEQ</attrdefs>
        <attrdomv>
          <udom>Text describing the site location</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Species</attrlabl>
        <attrdef>The name of the fish species that was analyzed</attrdef>
        <attrdefs>User Defined</attrdefs>
        <attrdomv>
          <udom>Text describing the species of the fish tissue analyzed for the sample. Samples represented composite samples of 3 to 5 individuals.</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Latitude</attrlabl>
        <attrdef>Latitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>37.41406</rdommin>
            <rdommax>37.55208985</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Longitude</attrlabl>
        <attrdef>Longitude coordinate for the site location.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>-77.0162</rdommin>
            <rdommax>-77.27108798</rdommax>
            <attrunit>number</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Date_Time</attrlabl>
        <attrdef>Date and time the sample was collected</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>202112201210</rdommin>
            <rdommax>202112211045</rdommax>
            <attrunit>yyyymmddhhmm</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Medium_code</attrlabl>
        <attrdef>Medium Code for the Sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>BA</edomv>
            <edomvd>tissue - Regular Environmental Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Type</attrlabl>
        <attrdef>Code used to distinguish the type of sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>Environmental</edomv>
            <edomvd>A regular sample collected in the field</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Collection_Agency</attrlabl>
        <attrdef>Agency responsible for the collection of the sample.</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>USGS</edomv>
            <edomvd>U.S. Geological Survey</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanoate (PFBA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanoate (PFPeA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanoate (PFHxA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanoate (PFHpA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanoate (PFOA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanoate (PFNA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanoate (PFDA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFUnA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroundecanoate (PFUnDA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanoate (PFDoDA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTrDA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotridecanoate (PFTrDA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTeDA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorotetradecanoate (PFTeDA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorobutanesulfonate (PFBS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoropentanesulfonate (PFPeS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorohexanesulfonate (PFHxS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoroheptanesulfonate (PFHpS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonate (PFOS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorononanesulfonate (PFNS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorodecanesulfonate (PFDS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorododecanesulfonate (PFDoDS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>4:2 FTS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 4:2 Fluorotelomersulfonate (4:2 FTS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>6:2 FTS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 6:2 Fluorotelomersulfonate (6:2 FTS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>8:2 FTS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 8:2 Fluorotelomersulfonate (8:2 FTS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOSA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluorooctanesulfonamide (PFOSA, also called FOSA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamide (N-MeFOSA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamide (N-EtFOSA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>MeFOSAA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoacetate (N-MeFOSAA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>EtFOSAA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoacetate (N-EtFOSAA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSE_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Methylperfluorooctanesulfonamidoethanol (N-MeFOSE), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSE_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of N-Ethylperfluorooctanesulfonamidoethanol (N-EtFOSE), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>HFPO-DA_tissue_nanograms per gram</attrlabl>
        <attrdef>Perfluoro-2-propoxypropanoate (HFPO-DA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>ADONA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 4,8-Dioxa-3H-perfluorononanoate (ADONA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>9Cl-PF3ONS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonate (9Cl-PF3ONS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>11Cl-PF3OUdS_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonate (11Cl-PF3OUdS), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>3:3 FTCA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoropropyl propanoic acid (3:3 FTCA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>5:3 FTCA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>7:3 FTCA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of 3-Perfluoroheptyl propanoic acid (7:3 FTCA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFEESA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMPA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-3-methoxypropanoic acid (PFMPA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMBA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Perfluoro-4-methoxybutanoic acid (PFMBA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>NFDHA_tissue_nanograms per gram</attrlabl>
        <attrdef>Numerical value representing the concentration of Nonafluoro-3,6-dioxaheptanoic acid (NFDHA), tissue, wet weight, nanograms per gram</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of nanograms per gram</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFBA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C4]butanoic acid (13C4-PFBA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFPeA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C5]pentanoic acid (13C5-PFPeA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFHxA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,6-13C5]hexanoic acid (13C5-PFHxA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFHpA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4-13C4]heptanoic acid (13C4-PFHpA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C8]octanoic acid (13C8-PFOA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C9-PFNA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C9]nonanoic acid (13C9-PFNA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C6-PFDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6-13C6]decanoic acid (13C6-PFDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C7-PFUnA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6,7-13C7]undecanoic acid (13C7-PFUnA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFDoA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]dodecanoic acid (13C2-PFDoA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFTeDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]tetradecanoic acid (13C2-PFTeDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFBS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[2,3,4-13C3]butanesulfonic acid (13C3-PFBS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFHxS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[1,2,3-13C3]hexanesulfonic acid (13C3-PFHxS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonic acid (13C8-PFOS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-4:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]hexanesulfonicacid (13C2-4:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-6:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]octanesulfonicacid (13C2-6:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-8:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]decanesulfonicacid (13C2-8:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonamide (13C8-PFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-N-MeFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamide (D3-N-MeFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-N-EtFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamide (D5-N-EtFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-MeFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamidoacetic acid (D3-MeFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-EtFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamidoacetic acid (D5-EtFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D7-NMe-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d7-perfluorooctanesulfonamidoethanol (D7-NMe-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D9-NEt-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d9-perfluorooctanesulfonamidoethanol (D9-NEt-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-HFPO-DA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Tetrafluoro-2-heptafluoropropoxy-13C3-propanoic acid (13C3-HFPO-DA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
    </detailed>
    <detailed>
      <enttyp>
        <enttypl>Ongoing_Precision_and_Recovery</enttypl>
        <enttypd>Excel file and text file containing attribute information associated with the data set.</enttypd>
        <enttypds>Producer defined</enttypds>
      </enttyp>
      <attr>
        <attrlabl>Sample_ID</attrlabl>
        <attrdef>Unique sample identifier used by the analyzing laboratory.</attrdef>
        <attrdefs>Producer Defined</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>79883101</rdommin>
            <rdommax>81302103</rdommax>
            <attrunit>numeric</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample_Date_Time</attrlabl>
        <attrdef>Date and time the sample was collected</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>202112201215</rdommin>
            <rdommax>202112211230</rdommax>
            <attrunit>yyyymmddhhmm</attrunit>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Medium_Code</attrlabl>
        <attrdef>Medium Code for the Sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>OAQ</edomv>
            <edomvd>Water Quality Assurance Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>SBQ</edomv>
            <edomvd>Sediment Quality Assuarance Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
        <attrdomv>
          <edom>
            <edomv>BAQ</edomv>
            <edomvd>Tissue Quality Assurance Sample</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Sample Type</attrlabl>
        <attrdef>Code used to distinguish the type of sample</attrdef>
        <attrdefs>USGS</attrdefs>
        <attrdomv>
          <edom>
            <edomv>Laboratory Spike</edomv>
            <edomvd>A spike sample reported by the analyzing laboratory</edomvd>
            <edomvds>USGS</edomvds>
          </edom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBA_percent recovery</attrlabl>
        <attrdef>Perfluorobutanoate (PFBA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeA_percent recovery</attrlabl>
        <attrdef>Perfluoropentanoate (PFPeA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxA_percent recovery</attrlabl>
        <attrdef>Perfluorohexanoate (PFHxA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpA_percent recovery</attrlabl>
        <attrdef>Perfluoroheptanoate (PFHpA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOA_percent recovery</attrlabl>
        <attrdef>Perfluorooctanoate (PFOA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNA_percent recovery</attrlabl>
        <attrdef>Perfluorononanoate (PFNA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDA_percent recovery</attrlabl>
        <attrdef>Perfluorodecanoate (PFDA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFUnA_percent recovery</attrlabl>
        <attrdef>Perfluoroundecanoate (PFUnDA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoA_percent recovery</attrlabl>
        <attrdef>Perfluorododecanoate (PFDoDA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTrDA_percent recovery</attrlabl>
        <attrdef>Perfluorotridecanoate (PFTrDA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFTeDA_percent recovery</attrlabl>
        <attrdef>Perfluorotetradecanoate (PFTeDA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFBS_percent recovery</attrlabl>
        <attrdef>Perfluorobutanesulfonate (PFBS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFPeS_percent recovery</attrlabl>
        <attrdef>Perfluoropentanesulfonate (PFPeS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHxS_percent recovery</attrlabl>
        <attrdef>Perfluorohexanesulfonate (PFHxS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFHpS_percent recovery</attrlabl>
        <attrdef>Perfluoroheptanesulfonate (PFHpS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOS_percent recovery</attrlabl>
        <attrdef>Perfluorooctanesulfonate (PFOS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFNS_percent recovery</attrlabl>
        <attrdef>Perfluorononanesulfonate (PFNS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDS_percent recovery</attrlabl>
        <attrdef>Perfluorodecanesulfonate (PFDS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFDoS_percent recovery</attrlabl>
        <attrdef>Perfluorododecanesulfonate (PFDoDS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>4:2 FTS_percent recovery</attrlabl>
        <attrdef>4:2 Fluorotelomersulfonate (4:2 FTS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>6:2 FTS_percent recovery</attrlabl>
        <attrdef>6:2 Fluorotelomersulfonate (6:2 FTS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>8:2 FTS_percent recovery</attrlabl>
        <attrdef>8:2 Fluorotelomersulfonate (8:2 FTS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFOSA_percent recovery</attrlabl>
        <attrdef>Perfluorooctanesulfonamide (PFOSA, also called FOSA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSA_percent recovery</attrlabl>
        <attrdef>N-Methylperfluorooctanesulfonamide (N-MeFOSA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSA_percent recovery</attrlabl>
        <attrdef>N-Ethylperfluorooctanesulfonamide (N-EtFOSA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>MeFOSAA_percent recovery</attrlabl>
        <attrdef>N-Methylperfluorooctanesulfonamidoacetate (N-MeFOSAA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>EtFOSAA_percent recovery</attrlabl>
        <attrdef>N-Ethylperfluorooctanesulfonamidoacetate (N-EtFOSAA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-MeFOSE_percent recovery</attrlabl>
        <attrdef>N-Methylperfluorooctanesulfonamidoethanol (N-MeFOSE), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>N-EtFOSE_percent recovery</attrlabl>
        <attrdef>N-Ethylperfluorooctanesulfonamidoethanol (N-EtFOSE), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>HFPO-DA_percent recovery</attrlabl>
        <attrdef>Perfluoro-2-propoxypropanoate (HFPO-DA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>ADONA_percent recovery</attrlabl>
        <attrdef>4,8-Dioxa-3H-perfluorononanoate (ADONA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>9Cl-PF3ONS_percent recovery</attrlabl>
        <attrdef>9-Chlorohexadecafluoro-3-oxanonane-1-sulfonate (9Cl-PF3ONS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>11Cl-PF3OUdS_percent recovery</attrlabl>
        <attrdef>11-Chloroeicosafluoro-3-oxaundecane-1-sulfonate (11Cl-PF3OUdS), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>3:3 FTCA_percent recovery</attrlabl>
        <attrdef>3-Perfluoropropyl propanoic acid (3:3 FTCA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>5:3 FTCA_percent recovery</attrlabl>
        <attrdef>2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>7:3 FTCA_percent recovery</attrlabl>
        <attrdef>3-Perfluoroheptyl propanoic acid (7:3 FTCA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFEESA_percent recovery</attrlabl>
        <attrdef>Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMPA_percent recovery</attrlabl>
        <attrdef>Perfluoro-3-methoxypropanoic acid (PFMPA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>PFMBA_percent recovery</attrlabl>
        <attrdef>Perfluoro-4-methoxybutanoic acid (PFMBA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>NFDHA_percent recovery</attrlabl>
        <attrdef>Nonafluoro-3,6-dioxaheptanoic acid (NFDHA), laboratory spike sample for ongoing precision and recovery, percent recovery</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFBA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C4]butanoic acid (13C4-PFBA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFPeA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C5]pentanoic acid (13C5-PFPeA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C5-PFHxA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,6-13C5]hexanoic acid (13C5-PFHxA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C4-PFHpA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4-13C4]heptanoic acid (13C4-PFHpA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C8]octanoic acid (13C8-PFOA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C9-PFNA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[13C9]nonanoic acid (13C9-PFNA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C6-PFDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6-13C6]decanoic acid (13C6-PFDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C7-PFUnA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2,3,4,5,6,7-13C7]undecanoic acid (13C7-PFUnA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFDoA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]dodecanoic acid (13C2-PFDoA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-PFTeDA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-n-[1,2-13C2]tetradecanoic acid (13C2-PFTeDA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFBS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[2,3,4-13C3]butanesulfonic acid (13C3-PFBS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-PFHxS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[1,2,3-13C3]hexanesulfonic acid (13C3-PFHxS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonic acid (13C8-PFOS), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-4:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]hexanesulfonicacid (13C2-4:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-6:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]octanesulfonicacid (13C2-6:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C2-8:2 FTS_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for 1H,1H,2H,2H-Perfluoro-1-[1,2-13C2]decanesulfonicacid (13C2-8:2 FTS), recovery, percent"</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C8-PFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Perfluoro-1-[13C8]octanesulfonamide (13C8-PFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-N-MeFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamide (D3-N-MeFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-N-EtFOSA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamide (D5-N-EtFOSA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D3-MeFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d3-perfluoro-1-octanesulfonamidoacetic acid (D3-MeFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D5-EtFOSAA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d5-perfluoro-1-octanesulfonamidoacetic acid (D5-EtFOSAA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D7-NMe-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-methyl-d7-perfluorooctanesulfonamidoethanol (D7-NMe-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>D9-NEt-FOSE_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for N-ethyl-d9-perfluorooctanesulfonamidoethanol (D9-NEt-FOSE), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>13C3-HFPO-DA_percent</attrlabl>
        <attrdef>Extracted internal standard recovery for Tetrafluoro-2-heptafluoropropoxy-13C3-propanoic acid (13C3-HFPO-DA), recovery, percent</attrdef>
        <attrdefs>Producer defined</attrdefs>
        <attrdomv>
          <udom>Numerical value in units of percent</udom>
        </attrdomv>
      </attr>
    </detailed>
    <overview>
      <eaover>These data are available in four Excel (.xlsx) files that contain water-quality results and quality-assurance results. The Excel files are duplicated as tab-delimited text files to increase 
accessibility to nonproprietary formats. The files titled Middle_Chickahominy_Fish_Tissue_Results contain analytical results for PFAS in tissue samples collected from various fish species at different 
locations. The files titled Middle_Chickahominy_Sediment_Results contain analytical results for PFAS in sediments collected at four locations in the watershed. The files titled 
Middle_Chickahominy_Surface_Water_Results contain analytical results for PFAS in surface water collected at eleven locations in the watershed.
These files also contain associated field blanks, lab blanks, and replicates used for quality control. Lab blanks are used to assess contamination imparted by the analytical process. 
Field blanks were collected using certified analyte-free water at the sampling point and used to assess possible cross contamination from sampling materials and sampling technique in the field. 
Field replicates were collected concurrently with the environmental sample and used to understand the variability of results. 
This XML file titled Middle_Chickahominy_Metadata contains metadata explaining the provenance of the data and should be thoroughly read to understand data structure and limitations. 
The files titled Data_Dictionary may be used as a reference to explain codes, terms, and abbreviations used in these datasets. The files titled 
Ongoing_Precision_and_Recovery contain quality assurance samples reported by the lab which establishes additional confidence in results over time. 
These data include text and leading zeros on some numbers which may be misinterpreted when imported into different spreadsheet programs. 
It is preferable that the data are formatted as text to avoid this problem but please ensure data are properly formatted and appear as intended when importing files into different programs.</eaover>
      <eadetcit>U.S. Geological Survey National Water Information System (NWIS) https://help.waterdata.usgs.gov/codes-and-parameters/parameters</eadetcit>
    </overview>
  </eainfo>
  <distinfo>
    <distrib>
      <cntinfo>
        <cntperp>
          <cntper>USGS ScienceBase</cntper>
          <cntorg>U.S. Geological Survey - ScienceBase</cntorg>
        </cntperp>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>Denver Federal Center, Building 810, Mail Stop 302</address>
          <city>Denver</city>
          <state>CO</state>
          <postal>80225</postal>
          <country>United States</country>
        </cntaddr>
        <cntvoice>1-888-275-8747</cntvoice>
        <cntemail>sciencebase@usgs.gov</cntemail>
      </cntinfo>
    </distrib>
    <distliab>Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.</distliab>
  </distinfo>
  <metainfo>
    <metd>20230912</metd>
    <metc>
      <cntinfo>
        <cntperp>
          <cntper>Mitchell A McAdoo</cntper>
          <cntorg>US Geological Survey West Virginia Water Science Center</cntorg>
        </cntperp>
        <cntpos>Hydrologist</cntpos>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>11 Dunbar St</address>
          <city>Charleston</city>
          <state>West Virginia</state>
          <postal>25301</postal>
          <country>US</country>
        </cntaddr>
        <cntvoice>304-347-5130</cntvoice>
        <cntemail>mmcadoo@usgs.gov</cntemail>
      </cntinfo>
    </metc>
    <metstdn>Content Standard for Digital Geospatial Metadata</metstdn>
    <metstdv>FGDC-STD-001-1998</metstdv>
  </metainfo>
</metadata>
