An area where a hazardous substance may have been deposited, stored, disposed, or placed. Also, soil that may have become contaminated as a result of hazardous substance migration. In general, however, the volumes of air, ground water, surface water, and surface water sediments that may have become contaminated through migration are not considered sources.
Any place or object from which pollutants are released, such as a power plant, factory, tractor, car, or other machines. Mobile sources move (e.g., cars and buses), while stationary sources do not (e.g., factories).