The Waste Analysis Sampling, Testing and Evaluation (WASTE) Program is a multi-year, multi-disciplinary program designed to elicit the source and fate of environmentally significant trace materials as solid waste progresses through management processes. One of the runs involved the intentional introduction of lead acid batteries; a second, the introduction of high cadmium PVC pellets; a third, introduction of cadmium benzoate solution; and a fourth, the simultaneous introduction of all tree materials along with the MSW feed. Comparison of the residue and stack emissions between the six baseline cases and the spiking runs shows that most of the lead reports to the grate sifting with a slight increase discernable in the boiler hoppers. The measure lead and cadmium increases were not quantitative (based on mass balances) indicating metal hang-up in either the boiler tube bands or grate siftings system.