[en] This report summarizes available information concerning the general identification of hazardous and radioactive contaminated waste material disposed in the Subsurface Disposal Area (SDA) of the Radioactive Waste Management Complex (RWMC) at the Idaho National Engineering Laboratory (INEL). Particular emphasis will be given to the 1952 to 1970 time period since it was during this time that transuranic (TRU) radionuclide contaminated waste was disposed below ground with low-level waste (LLW). This report covers off-site and site-generated waste. Most of the waste disposal information collected to date represents estimates of the amount of waste material disposed of at the SDA. Several task projects were completed in FY-1989. Continuing research in FY-1990 will gain more specific information on the waste disposed of in the SDA. The scope of this report is on the waste generated and buried in the SDA during 1952 through 1970. The waste disposal investigation to date has included: researching records and logbooks; reviewing past photographs and technical drawings; interviewing/debriefing personnel familiar with past waste management practices at the INEL; and analyzing existing data bases. This report is a compilation of information gathered from the FY-1989 efforts as well an extensive amount of information gained from research conducted in the 1970s and early 1980s. 18 refs., 11 figs., 11 tabs