Air emissions can take the form of particulate matter, mists, fumes, or gases. Local meteorology is most important for determining those neighboring populations which are most at risk. The substance that was tested for contamination at an NPL site.
Examples are groundwater , surface water , subsurface soil , and leachate .
A source that is not associated with a specific point and is generally unmeasureable. Reports of poundage are based on estimates. Examples include a conveyor belt carrying raw materials or the dirt road network within a facility. Defines what the waste is. Most wastes have more than one code.