Benzene concentrations (ppb) at one background and one downgradient well (eight monthly measures at each well).
EPA.09.Ex.16.2.benzene.df
A data frame with 16 observations on the following 3 variables.
Month
a factor indicating the month of collection
Well.type
a factor indicating the well type (background vs. downgradient)
Benzene.ppb
a numeric vector of benzene concentrations (ppb)