off-gas | Vapors that are emitted from extraction and treatment systems. These vapors can either be discharged directly to the atmosphere or captured or destroyed. |
operation and maintenance (O&M) | O&M activities are conducted to maintain the effectiveness of the remedy. They include operational procedures and routine maintenance. |
organic chemical or compound | A substance produced by animals or plants that contains mainly carbon, hydrogen, and oxygen. |
oxygenate | To treat, combine, or infuse with oxygen. Oxygenates are added to fuel to enhance combustion. |
ozone | A form of oxygen (03) found naturally which provides a protective layer shielding the earth from ultraviolet radiation. Ozone is also produced as a byproduct of combustion and is a major component of smog. Ozone is also used as an oxidizing agent in some treatment technologies. |