Trichloroethylene Concentrations from Example 18-3 of 2009 USEPA Guidance Document

Trichloroethylene (TCE) concentrations (ppb) at three background wells and one compliance well. Six monthly measures at each background well, three monthly measures at the compliance well.

EPA.09.Ex.18.3.TCE.df

Format

A data frame with 24 observations on the following 6 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)

TCE.ppb.orig

a character vector of original TCE concentrations (ppb)

TCE.ppb

a numeric vector of TCE concentrations (ppb) with nondetects set to their detection limit

Censored

a logical vector indicating which observations are censored

Source

USEPA. (2009). Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Unified Guidance. EPA 530/R-09-007, March 2009. Office of Resource Conservation and Recovery Program Implementation and Information Division. U.S. Environmental Protection Agency, Washington, D.C. p.18-19.

USEPA. (2010). Errata Sheet - March 2009 Unified Guidance. EPA 530/R-09-007a, August 9, 2010. Office of Resource Conservation and Recovery, Program Information and Implementation Division. U.S. Environmental Protection Agency, Washington, D.C.