Experiments were performed to provide an indication of the amount of material that could be made airborne during soil-working operations in a contaminated area. Contaminated soil was collected, dried, and mixed, and particle size distribution and contamination levels characterized. In a 0.6 × 0.6 m wind tunnel, soil was pumped into an airstream moving at 1.4, 4.6, 6.8, and 8.9 m/s. Airborne mass and particle size samples were collected. The fraction of source soil made airborne increased as a linear function of wind speed. Airborne contamination increased with wind speed at a rate about 4 times the soil mass. Source terms (i.e., fraction of material initially made airborne) can be estimated using the information developed. These can, in turn, be used in diffusion models to estimate downwind contamination levels as required for safety assessments of radioactive or chemical waste sites.