Chloride concentrations (mg/L) at 10 compliance wells at a solid waste landfill. One year of quarterly measures at each well.
A data frame with 40 observations on the following 2 variables.
a factor indicating the well number
a numeric vector of chloride 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.19-19.
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.