The CONTAM User Guide and Program Documentation is available via the Help menu of the ContamW interface and as a downloadable PDF on the following page of this website (CONTAM Documentation).
Press the F1 key when running ContamW to activate the context-sensitive help system. This will jump directly to the appropriate section of the CONTAM User Guide that is packaged with ContamW. You can also use the search feature to find a word within all the topics of the program-based help.
See the CONTAM User Group page.