DEEP: Gasoline Dispensing Facilities: Stage I and Stage II

Gasoline Dispensing Facilities

Stage I and Stage II Vapor Recovery

Stage I Stage II
{Image of Stage I Vapor Recovery} {Image of Stage II Vapor Recovery}
Stage I Vapor Control is the control of gasoline vapor emissions that occurs when gasoline is delivered in bulk from tanker trucks to the underground storage tanks located at dispensing stations. Stage I Vapor Recovery is the system used to capture the vapors displaced from the underground storage tanks during these deliveries. The captured vapors are piped back into the empty space within the tanker truck so they can be returned to the terminal for processing. Stage II Vapor Control is the control of gasoline vapor emissions that occurs when vehicles are being fueled at gasoline dispensing stations. Stage II Vapor Recovery is the system used to capture the gasoline vapors at the vehicle fill pipe. The captured vapors are returned to the empty space in the underground storage tank at the dispensing station. The vapors stored in the underground storage tanks will later be transferred to the terminal for processing during the next bulk delivery via the Stage I Vapor Recovery system.  Section 22a-174e of the Connecticut General Statutes requires that all Stage II systems be decommissioned by July 1, 2015.
  Onboard Refueling Vapor Recovery (ORVR)
Onboard Refueling Vapor Recovery (ORVR) captures fuel vapors from the vehicle gas tank during refueling. In vehicles with ORVR, the gas tank and fill pipe are designed so that when refueling the vehicle, fuel vapors in the gas tank travel to an activated carbon packed canister, which adsorbs the vapor. When the engine is in operation, it draws the gasoline vapors into the engine intake manifold to be used as fuel. 
Stage II Vapor Recovery System Decommissioning
July 1, 2015 was the deadline for decommissioning Stage II vapor recovery equipment.
On June 18, 2013, Public Act No. 13-120 was signed into law and immediately became effective. This Act repealed the previous version of Connecticut General Statute Section 22a-174e, which required the Connecticut Department of Energy & Environmental Protection (DEEP) to adopt regulations pertaining to the installation and testing of Stage II vapor recovery systems and replaced it with language that mandates the decommissioning of all Stage II systems by July 1, 2015.
An overview of Public Act No. 13-120 (An Act Concerning Gasoline Vapor Recovery Systems) and what is required to complete the decommissioning of all Stage II systems by July 1, 2015.
Any station with a Stage II system currently in place is in violation of Public Act No. 13-120.  The owner/operator of the station must notify DEEP and decommission their Stage II equipment.  Three forms are needed to complete the decommissioning process:
  • Intent to Decommission Notification (Word , PDF )
  • Pressure Decay Test Notification (Word , PDF
The Pressure Decay Test Notification is required to be used during the decommissioning process. It must also be used for annual Stage I testing.
  • Certification Report for a Decommissioned Stage II Vapor Recovery System (Word , PDF )
Why Decommission? 
Stage II gasoline vapor recovery systems have been a required emissions control measure in ozone nonattainment areas since 1990.  Beginning with model year 1998, ORVR equipment was phased in for new vehicles, and has been a required control on all new vehicles since 2006. Both Stage II vapor recovery and onboard refueling vapor recovery (ORVR) systems recover gasoline vapors during refueling. In 2012, the EPA determined that ORVR is in widespread use throughout the motor vehicle fleet and waived the requirement that states implement Stage II vapor control programs.

Continued operation of vacuum assist Stage II vapor recovery systems will increase gas station emissions due to the incompatibility between vacuum assist Stage II systems and ORVR.  Prior to the promulgation of Public Act No. 13-120, ninety-four percent of gasoline sold in Connecticut was dispensed through incompatible vacuum assist Stage II vapor recovery systems.

Recent Regulatory Changes
New Regulations concerning the control of air emissions during the transfer and dispensing of gasoline took effect on July 8, 2015:

This new regulation consolidates the Stage I vapor recovery requirements previously contained in RCSA sections 22a-174-20(b) and 22a-174-30 and incorporates existing federal requirements for controlling air emissions from gas stations (40 CFR 63 Subpart CCCCCC, Table 1).

Section 22a-174-20(b) - Control of Organic Compound Emissions: loading of gasoline and other volatile organic compounds - Revised 

These revisions remove Stage I requirements from RCSA section 22a-174-2(b) and  incorporate existing federal requirements for controlling air emissions from gasoline delivery vehicles (40 CFR 63 Subpart CCCCCC, Table 2).

Section 22a-174-30 - Dispensing of Gasoline/Stage I and Stage II Vapor Recovery - Repealed

**Please review these regulations to see how your gas station or fuel delivery company is affected.**

Summary of Stage I Vapor Recovery Requirements

  • Gas stations with a monthly throughput of 10,000 gallons or more must install, maintain, and test Stage I vapor recovery equipment.
Note: Applicability requirements have changed.  Stations that have not pumped more than 10,000 gallons per month over the last several years may be exempt from many of the Stage I requirements.   
  • Any newly installed P/V vent cap must be California Air Resource Board (CARB) approved.
  • The following tests must be conducted on a Stage I vapor recovery system at least once per calendar year:
    • CARB TP-201.1E, Leak Rate and Cracking Pressure of Pressure/Vacuum Vent Valves
    • CARB TP-201.3, Determination of 2 Inch WC Static Pressure Performance of Vapor Recovery Systems of Dispensing Facilities
    • CARB TP-201.3C, Determination of Vapor Piping Connections to Underground Gasoline Storage Tanks (Tie-Tank Test)  

Current Certification and Test Procedures (CARB)

  • Pressure Decay Test Notification must be submitted to at least 7 business days prior to testing.
  • Any pressure management or vapor control device installed on a storage tank that is not required as part of a Stage I vapor recovery system must also be tested annually.  A test protocol must be submitted for review and approval at least 60 days prior to conducting such test.
  • Any vapor control equipment that fails any required test must be repaired and re-tested within 60 days.
  • Test results must be submitted to no later than 10 days after testing.
Note: DEEP is in the process of updating all required Stage I forms. Updated Stage I forms will be made available on the Air Compliance Reporting Forms webpage. In the meantime, please use the Pressure Decay Test Notification form provided above and submit all test results along with the station information to

DEEP Air Bureau Contact
Kathleen Rankin
DEEP Air Bureau

Content Last Updated on October 14, 2015