EnvironmentalStats for S Plus® : User’s Manual for Version 2.0 EnvironmentalStats for S PLUS is an add on module to S PLUS and the first comprehensive software package for environmental scientists engineers and regulators. EnvironmentalStats for S PLUS provides a set of powerful yet simple to use pull down menus and functions for performing graphical and statistical analyses of environmental data parameter and quantile estimation methods for dealing with non detects power and sample size calculations prediction and tolerance intervals and probabilistic risk assessment. EnvironmentalStats for S PLUS includes an extensive hypertext help system that explains methods from the environmental literature and regulatory guidance documents along with a glossary of commonly used statistical and environmental terms. This new edition of the Users Manual provides the documentation for Version 2.0 (which runs under S PLUS 6.0) and includes extensive examples using data sets from regulatory guidance documents. All examples show how to produce the results by using the new pull down menus or by calling functions from the command line