An option in the program for Long-Term Management of High-Level Idaho Chemical Processing Plant (ICPP) Wastes calls for retrieving calcined waste stored at ICPP and converting it to a more stable, less dispersible form. Waste solidification options include vitrification, pelletization, or conversion to a ceramic form. A calcine inventory, from December 1963 to September 1979, has been prepared based on calciner run and solids storage facilities information which gives the range of chemical compositions of calcined waste stored at ICPP. Information researched includes calciner startup data, waste solution types and volumes calcined, calciner operating schedules, solids storage bin capacities, calcine storage bin distributor systems and solids storage bin thermocouple locations and temperature records. A recommendation for improving calcine inventory control is given.