Soil and debris from Superfund sites must be treated to minimize their threat to human health and the environment as part of remedial actions at such sites. Studies were conducted on the effectiveness with which five treatment processes removed or immobilized synthetic soils containing volatile and semivolatile organics and metals. The treatment technologies were soil washing, dechlorination with potassium polyethylene glycol (KPEG), incineration, low temperature thermal desorption and solidification/fixation. The paper describes the production of four synthetic soils containing varying levels of contaminants and reports the effectiveness of the five treatment methods.