Log-transformed chrysene concentrations (ppb) at two background and three compliance wells (four monthly measures at each well).
EPA.09.Ex.17.3.log.chrysene.df
A data frame with 20 observations on the following 4 variables.
Month
a factor indicating the month of collection
Well
a factor indicating the well number
Well.type
a factor indicating the well type (background vs. compliance)
Log.Chrysene.ppb
a numeric vector of log-transformed chrysene concentrations (ppb)