Copper concentrations (ppb) at two background and one compliance wells (six monthly samples for each well).
EPA.92c.copper1.dfA data frame with 18 observations on the following 4 variables.
Coppera numeric vector of copper concentrations (ppb)
Montha factor indicating the month of collection
Wella factor indicating the well number
Well.typea factor indicating the well type (background vs. compliance)