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New Hampshire Department of Environmental Services

Vapor Recovery

NHDES 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 New Hampshire Code of Administrative Rules Env-Or 500 Recovery of Gasoline Vapors was revised. The revised rules provide that, as of January 1, 2012, new gas dispensing facilities are not required to install stage II vapor recovery systems, and that all existing systems in the state must be decommissioned by December 22, 2015. Facilities that continue to use stage II recovery systems must continue to comply with the stage II requirements until the system has been decommissioned.

The following images depict some key points of the vapor recovery program and are from a presentation prepared by the NHDES 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

Benefits of gasoline vapor recovery
Summary of Regulations
Vapor Recovery Cycle
Vapor collection at Station
Vapor Recovery from Vehicle Tank
Most Commonly Found Test Problems

View the full Stage I/II Vapor Recovery Presentation. Adobe Acrobat Reader Symbol



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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
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