Format
A data frame with 19 observations on the following 4 variables.
Date
- a Date object indicating the date of collection
Chloride.ppm
- a numeric vector of chloride concentrations (ppm)
Elapsed.Days
- a numeric vector indicating the number of days since January 1, 2002
Residuals
- a numeric vector of residuals from a linear regression trend fit
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.17-26. 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.