The Lake Calumet area of southeast Chicago has a lengthy history of hazardous materials-handling activity. Illinois State Museum staff consulted numerous sources and reviewed their contents to compile and produce an electronic data base which will enable researchers to determine where and when particular types of hazardous materials and related activity occurred at specific sites. Archival records, regulatory files, and other sources collected by Museum staff contributed information to the data base. Once collected, the information was formated for entry into the Illinois Geographic Information System (IGIS)--a computer system that enables the geographic and tabular data to be combined, recombined, and analyzed. The report provides instructions for the use of the system by the experienced ARC/INFO user, a summary of the data acquisition and entry procedures, and synopses of each data set.