EPA.89b.lead.df.RdLead concentrations (ppm) at two background and four compliance wells (four monthly samples for each well).
EPA.89b.lead.dfA data frame with 24 observations on the following 4 variables.
LeadLead concentrations (ppm)
Montha factor indicating the month of collection
Wella factor indicating the well number
Well.typea factor indicating the well type (background vs. compliance)
USEPA. (1989b). Statistical Analysis of Ground-Water Monitoring Data at RCRA Facilities, Interim Final Guidance. EPA/530-SW-89-026. Office of Solid Waste, U.S. Environmental Protection Agency, Washington, D.C. p.5-23.