Dissolved arsenic concentrations in ground water of U.S.
This dataset is a random selection of dissolved arsenic analyses taken during the U.S. Geological Survey's National Water Quality Assessment program (NAWQA).
data(Arsenic)
A list containing 50 observations with items ‘As’, ‘AsCen’, ‘Aquifer’. ‘As’ is a numeric vector of all arsenic observations (both censored and uncensored). ‘AsCen’ is a logical vector indicating where an element of ‘As’ is censored (a less-than value). ‘Aquifer’ is a grouping factor of hypothetical hydrologic sources for the data.
U.S. Geological Survey National Water Quality Assessment Data Warehouse
The USGS NAWQA site at http://water.usgs.gov/nawqa
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