The New Hampshire Department of Environmental Services (DES) implemented Stage I and Stage II vapor recovery programs starting in 1993. Stage I gasoline vapor recovery systems capture the vapors expelled from underground storage tanks at gasoline stations when being refilled by tank trucks. Stage II systems capture gasoline vapors which would otherwise be vented during individual vehicle refueling at gas stations. Stage I and Stage II systems not only reduce air pollution but also conserve gasoline that would otherwise be lost into the air. These systems also reduce exposure to inhalation of gasoline vapors which contain benzene, a known carcinogen, and other toxic substances.
The following images depict some key points of the vapor recovery program and are from a presentation prepared by the DES Air Resources Division. Click on the pictures to see the full size image. The full presentation can be viewed further down on this page.
For station owners
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View the full Stage I/II Vapor Recovery Presentation. 
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