The U.S. Geological Survey and the Geological Survey of Canada recently completed a continental-scale pilot study for a proposed geochemical survey of North American soils. This survey will provide baseline soil chemistry data against which future changes in soil composition can be measured and that can be used by Federal, State/Provincial, and local agencies when making risk-assessment and land-use decisions.
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USGS Numbered Series
Natural and Man-Made Chemicals in North American Soils--Continental-Scale Pilot Study Completed