Arsenic {NADA}

Dissolved arsenic concentrations in ground water of U.S.

Description

This dataset is a random selection of dissolved arsenic analyses taken during the U.S. Geological Survey's National Water Quality Assessment program (NAWQA).

Usage

    data(Arsenic)

Format

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.

Source

U.S. Geological Survey National Water Quality Assessment Data Warehouse

References

The USGS NAWQA site at http://water.usgs.gov/nawqa