We provide several pages with free downloads:

Applied Environmental Statistics course textbook

Software for handling nondetect data (Version 4.3 of the NADA package for Minitab v17)

NADA for R. Software for the R statistical system for handling nondetect data

Much more is available when you take any of our courses, including software for partial plots, the quantile test, trend analysis (made easy), additional software for Kaplan-Meier and other methods for nondetects, and enhanced biplots. Look for one of our upcoming classes.