Gasoline vapors are released to the atmosphere
every time a fuel tank is filled with gasoline. This happens with the filling
a large underground storage tank as well as the fuel tank of a motor vehicle.
Vermont has adopted regulations that require the control of these vapor
Stage I vapor recovery refers to the capture
of gasoline vapors generated when a tank truck delivers gasoline to a
storage tank at a gasoline station. As the storage tank is filled, the
vapors are transferred to the tank truck, which then carries the vapors
to the gasoline distribution terminal. At the terminal, the vapors are
condensed into liquid gasoline or are incinerated.
Stage II vapor recovery refers to the capture
of gasoline vapors generated when a motor vehicle fuel tank is filled
at a gasoline station. Using a specially designed nozzle, the vapors are
transferred from the fuel tank in the vehicle to the storage tank at the
station as the vehicle fuel tank is filled.
Owners of stations with Stage II vapor recovery
are required to test the equipment to ensure proper operation when the
vapor control equipment is installed, and every five years after that.
These tests are typically observed by Compliance Section staff. Compliance
Section staff also perform compliance inspections of stations with Stage
I or Stage II vapor recovery equipment.
Phase-out of Stage II Vapor Recovery
Beginning with the 1998 model year, a federal law established a phase-in schedule requiring gasoline powered motor vehicles to incorporate on-board equipment to capture the gasoline vapor emissions from refueling. These controls, referred to as on-board refueling vapor recovery (ORVR), have been required on the vast majority of gasoline powered motor vehicles since the 2006 model year. When most of the vehicles on the road are equipped with ORVR, Stage II vapor recovery can be discontinued without a significant impact on emissions.
A law was passed by the Legislature in 2009 that sets a date (January 1, 2013) after which gasoline stations in Vermont will no longer be required to have and operate Stage II vapor controls. In many cases, Stage II controls will not need to be installed or stations can stop using them before January 1, 2013. See Phase-out of Stage II Vapor Recovery for additional information.
An underground tank at a gasoline
station is being filled, and the gasoline vapors are being returned
to the tank truck.
||A nozzle at a gasoline station is being tested to
ensure that it captures gasoline vapors.
last update 2/27/15