Copper and zinc concentrations (mg/L) in shallow ground water from two geological zones (Alluvial Fan and Basin-Trough) in the San Joaquin Valley, CA. There are 68 samples from the Alluvial Fan zone and 50 from the Basin-Trough zone. Some observations are reported as <\(DL\), where \(DL\) denotes a detection limit. There are multiple detection limits for both the copper and zinc data in each of the geological zones.
Millard.Deverel.88.dfA data frame with 118 observations on the following 8 variables.
Cu.origa character vector of original copper concentrations (mg/L)
Cua numeric vector of copper concentrations with nondetects coded to their detection limit
Cu.censoreda logical vector indicating which copper concentrations are censored
Zn.origa character vector of original zinc concentrations (mg/L)
Zna numeric vector of zinc concentrations with nondetects coded to their detection limit
Zn.censoreda logical vector indicating which zinc concentrations are censored
Zonea factor indicating the zone (alluvial fan vs. basin trough)
Locationa numeric vector indicating the sampling location
Deverel, S.J., R.J. Gilliom, R. Fujii, J.A. Izbicki, and J.C. Fields. (1984). Areal Distribution of Selenium and Other Inorganic Constituents in Shallow Ground Water of the San Luis Drain Service Area, San Joaquin, California: A Preliminary Study. U.S. Geological Survey Water Resources Investigative Report 84-4319.