Mercury Concentrations from Example 19-5 of 2009 USEPA Guidance Document

Mercury concentrations (ppb) at four background and two compliance wells.

EPA.09.Ex.19.5.mercury.df

Format

A data frame with 36 observations on the following 6 variables.

Event

a factor indicating the time of collection

Well

a factor indicating the well number

Well.type

a factor indicating the well type (background vs. compliance)

Mercury.ppb.orig

a character vector of original mercury concentrations (ppb)

Mercury.ppb

a numeric vector of mercury 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.19-33.

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.