Naphthalene concentrations (ppb) at five background wells (five quarterly measures at each well).
EPA.09.Ex.12.4.naphthalene.df
A data frame with 25 observations on the following 3 variables.
Quarter
a numeric vector indicating the quarter the sample was taken
Well
a factor indicating the well number
Naphthalene.ppb
a numeric vector of naphthalene concentrations (ppb)