Description

Sulfate concentrations (ppm) collected over several years. The date of collection is simply indicated by month and year of collection. The column Date is a Date object where the day of the month has been arbitrarily set to 1.

Usage

Format

A data frame with 23 observations on the following 6 variables.

Sample.No

a numeric vector indicating the sample number

Year

a numeric vector indicating the year of collection

Month

a numeric vector indicating the month of collection

Sampling.Date

a numeric vector indicating the year and month of collection

Date

a Date object indicating the date of collection, where the day of the month is arbitrarily set to 1

Sulfate.ppm

a numeric vector of sulfate concentrations (ppm)

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.17-33.

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.