Sediment samples collected for the National Geochemical Survey (NGS; 1999-2011) which was conceived, designed, and implemented by Andrew Grosz, retired USGS geologist. It was overseen and funded by the Mineral Resources Program. It was “a collaborative effort between government, industry, and academia to map the geochemical landscape of the US (the entire 50 States). The NGS was the first systematic study of its type and magnitude attempted by the USGS with a parallel effort to map North America collaboratively with Mexico and Canada. The survey’s scope provides data for over 60 analytes, and extend[s] to the Atlantic, Gulf of Mexico Coastal Plain Province and adjacent Continental Shelf, Alaska, Hawaii, and the Commonwealth of the [Northern] Mariannas. Over 80,000 analyzed samples of surficial sediment covering about 70% of the US significantly advanced our knowledge about the chemical characteristics of the rocks and soils of the US. The NGS also characterized the nature and magnitude of anthropogenic and geologic arsenic signatures for the US” (https://www.globalmineralsands.com/andrew-grosz). The collection consists of 164 pallets of stream and soil samples collected within the United States. The samples are stored in cloth bags in plastic milk crates. Each pallet has ~27 milk crates on it.