Zinc concentrations (ppb) at five background wells
(eight samples for each well). Nondetects reported as
A data frame with 40 observations on the following 5 variables.
a character vector of original zinc concentrations (ppb)
a numeric vector of zinc concentrations with
<7 coded as
a logical vector indicating which observations are censored
a factor indicating the sample number
a factor indicating the well number
USEPA. (1992c). Statistical Analysis of Ground-Water Monitoring Data at RCRA Facilities: Addendum to Interim Final Guidance. Office of Solid Waste, U.S. Environmental Protection Agency, Washington, D.C. p.30.