Dissolved iron (Fe) concentrations (ppm) at six upgradient wells (four quarterly measures at each well).
EPA.09.Ex.13.1.iron.dfA data frame with 24 observations on the following 4 variables.
Montha numeric vector indicating the month the sample was taken
Yeara numeric vector indicating the year the sample was taken
Wella factor indicating the well number
Iron.ppma numeric vector if iron concentrations (ppm)