The follow definitions are used in the description of the cleanup technologies
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|natural attenuation||An approach to cleanup that uses natural processes to contain the spread of contamination from chemical spills and reduce the concentrations and amounts of pollutants in contaminated soil and groundwater. Natural subsurface processes, such as dilution, volatilization, biodegradation, adsorption, and chemical reactions with subsurface materials, are allowed to reduce concentrations of contaminants to acceptable levels. See technology description of Natural Attenuation.|
|non-point source||A term used to identify sources of pollution that are diffuse and do not have a point of origin or that are not introduced into a receiving stream from a specific outlet. Common non-point sources are runoff of rainwater from parking lots. |
|nonaqueous phase liquid (NAPL)||Organic substances that are relatively insoluble in water.|
|NPL||National Priorities List. The EPA's list of high priority sites in the country subject to the Superfund program.|
Note: A majority of the terms and definitions are based on the U.S. Environmental Protection Agency's Brownfields Innovative Technology Glossary . Some definitions have been modified/enhanced to support the Tech Tree text.