Sulfate concentrations (mg/L) at four background wells.
A data frame with 25 observations on the following 7 variables.
a factor indicating the well number
a numeric vector indicating the month of collection
a numeric vector indicating the day of the month of collection
a numeric vector indicating the year of collection
a Date object indicating the date of collection
a numeric vector of sulfate concentrations (mg/L)
a numeric vector of log-transformed sulfate concentrations (mg/L)
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.19-17.
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.