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                  <gml:endPosition>2010-12-31T00:00:00</gml:endPosition>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>
      <gmd:supplementalInformation>
        <gco:CharacterString>This database includes non-transformed variables representing the Air, Water, Land, Built, and Sociodemographic Domains/environment used for construction of the Air, Water, Land, Built, and Sociodemographic Domains index as well as the overall Environmental Quality Index as part of the USEPA's 2006-2010 EQI project. Refer to the original data source for data limitations. See source data websites for more detail - EPA's Air Quality system (https://aqs.epa.gov/aqsweb/documents/data_mart_welcome.html) and the National-scale Air Toxics Assessment (https://www.epa.gov/nata/); EPA's WATERS (Watershed Assessment, Tracking and Environmental Results) Database (https://www.epa.gov/waters/), the U.S. Geological Survey Estimates of Water Use in the U.S. for 2006 through 2010 (https://water.usgs.gov/watuse/), the National Atmospheric Deposition Program (http://nadp.slh.wisc.edu/), the U.S. Drought Monitor Data (http://droughtmonitor.unl.edu/), the EPA's National Contaminant Occurrence Database (https://water.epa.gov/scitech/datait/databases/drink/ncod/databases-index.cfm), and Safe Drinking Water Information System (SDWIS) (https://ofmpub.epa.gov/apex/sfdw/f?p=108:200::::::); 2007 Census of Agriculture (http://www.agcensus.usda.gov/Publications/2007/index.asp), National Pesticide Use Database (http://pubs.usgs.gov/ds/752/); Web Feature Service for National Priority List (NPL) sites (https://www.epa.gov/superfund/national-priorities-list-npl-sites-state), Mine Safety and Health Administration data (https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp), and Map of Radon Zones (https://www.epa.gov/radon/zonemap.html); Dun and Bradstreet North American Industry Classification System (NAICS) codes (http://www.dnb.com), and Topologically Integrated Geographic Encoding and Referencing (TIGER) (https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html), Fatality Annual Reporting System (FARS) (http://www.nhtsa.gov/FARS), Housing and Urban Development (HUD) (https://pic.hud.gov/pic/haprofiles/haprofilelist.asp), National Land Cover Database (NLCD) (https://www.mrlc.gov/) and Coastal Change Analysis Program (C-CAP) (https://coast.noaa.gov/digitalcoast/), and EPA&#8217;s National Walkability Index (https://www.epa.gov/smartgrowth/smart-location-mapping); United States Census (http://www2.census.gov), the Federal Bureau of Investigation Uniform Crime Reports (http://www.ucrdatatool.gov), the USDA ERS Creative Class County Codes (https://www.ers.usda.gov/data-products/creative-class-county-codes/), and US Election Atlas (https://uselectionatlas.org/RESULTS/national.php?year=2008). Assumptions were made in variable construction/imputation, see report for detailed discussion.</gco:CharacterString>
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        <gco:Date>2022-10-22</gco:Date>
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