RCRA Subtitle C and D statistical analysis software for ground-water monitoring

ChemStat is a Windows 95/NT-based program for fast and accurate analysis of ground-water monitoring data at RCRA facilities. Analysis methods in ChemStat comply with 1989 and 1992 US EPA statistical guidance documents (included with the program). ChemStat is not a converted DOS program but is written as a 32-bit Windows 95/NT program from the first line of code. ChemStat is fast and powerful. The number of samples and number of wells are limited only by available computer memory. ChemStat has been tested on data sets with up to 5,000 samples.

ChemStat Features
ChemStat Analysis Methods
ChemStat Requirements


ChemStat includes easy-to-use Windows 95 interface features such as context-sensitive on-line help, Tip of the Day screen on startup, recent file lists, customizable printing with print-preview, spin buttons for numerical data entry, and more. Parameters and wells for analysis are selected from a drop-down list box on the main window tool bar.

ChemStat is not a database, but is designed specifically for statistical analysis of data. Data is imported from tab-delimited ASCII text files. Utilities to convert data from GRITS/STAT and ChemPoint formats are included. Importing accommodates filtering by start and end date, facility ID, and parameter suite. It also accepts comparison levels such as MCL for each parameter.

To reduce data set size, ChemStat has options to exclude all parameters with 100% non-detects. Results can be averaged for multiple samples on the same date (duplicates and replicates). Wells can be classified as up-gradient, down-gradient, or unused, and the well gradient can be changed.

ChemStat can perform any analysis on the original data or the natural log of the data. Easily represent non-detects by DL, 1/2 DL, 1, or 0. Normality tests can be used on the actual data or the residuals as required for parametric ANOVA.

ChemStat includes an Advisor Window which provides information about the selected method. If the data set is not suitable for the selected method such as too few samples or too many non-detects, the Advisor Window displays warnings or such unsuitability.


ChemStat includes a highly-customizable Control Chart for intra-well comparisons.

ChemStat Features

ChemStat is powerful. . .

ChemStat is easy to learn. . .

ChemStat data acquisition. . .