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NHEXAS PHASE I ARIZONA STUDY--METALS IN SOIL ANALYTICAL RESULTS
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NHEXAS PHASE I ARIZONA STUDY--METALS-XRF IN AIR ANALYTICAL RESULTS
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U.S. EPA Human Exposure and Atmospheric Sciences Division
P.O. Box 93478
NHEXAS PHASE I ARIZONA STUDY--QA ANALYTICAL RESULTS FOR METALS IN BLANK SAMPLES
NHEXAS is a rich source of data that EPA encourages you to use for research and analysis. Users must be familiar with data file manipulation and analysis. EPA cannot analyze, check results, debug programs, or review literature for your work. Thoroughly reviewing the documentation on the survey's planning, analytic guidelines, and datasets available through HEDS and EIMS should resolve most questions. If you have questions after reviewing the documentation, please contact the Human Exposure and Atmospheric Sciences Division at 919-541-3184 or email "admin.heds@epa.gov". Please review the data use restrictions in the Notice field and your agreement to comply with these restrictions in using the data.
These data are the result of a probability-based sampling design specific to the population under study. Thus the data may or may not be representative of subsets of this study's population or of other populations. The study was designed to test certain hypotheses, which may limit its applicability for other purposes. When using these data it is important to consider the percentage of non-responses or non-detects in the data as an indicator of its usefulness for other purposes. The U.S. EPA accepts no liability for any errors or omissions in the results included in the data sets, associated information, and/or documentation.
Based on the output format selected by the user and the software into which the data set is imported, users may notice measurements and sampling weights are zero-padded to the right of non-zero decimal digits. These zeroes are a function of the formatting process and the software's acceptance of that format and should not be construed as significant digits in the value. Measurement values are provided with four significant digits; sampling weights are provided with three decimal digits.
Some code values may have been revised from the values on the original questionnaire forms. Check the appropriate code set supplied with the data.