Time series of trichloroethene (TCE) concentrations (mg/L) taken at 2 separate
wells. Some observations are annotated with a data qualifier of U (nondetect)
or J (estimated detected concentration).
EPA.09.Table.9.1.TCE.dfA data frame with 30 observations on the following 5 variables.
Date.Collecteda factor indicating the date of collection
Datea Date object indicating the date of collection
Wella factor indicating the well number
TCE.mg.per.La numeric vector indicating the TCE concnetrations (mg/L)
Data.Qualifiera factor indicating the data qualifier