Format
A data frame with 16 observations on the following 4 variables.
Month
- a factor indicating the month of collection
Year
- a factor indicating the year of collection
Period
- a factor indicating the period (baseline vs. compliance)
Nickel.ppb
- a numeric vector of nickel concentrations (ppb)
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.20-4. 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.