The Consolidated Human Activity Database (CHAD) User Guide offers a short tutorial about CHAD Access; background on the CHAD Databases; background on individual studies in CHAD; and information about using CHAD data, caveats, known problems, notes, and database design and development.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- CHAD User's guide, June 2000 (PDF)(54 pp, 705 K, June 2000)