(Adopted May 21, 1992; Amended November 18, 1992; Amended December 17, 1992; Amended February 17, 1994; Amended June 18, 1998)

1.0 Purpose
The purpose of this rule is to limit emissions of gasoline vapors from the transfer of gasoline into motor vehicle fuel tanks.

2.0 Applicability
This rule applies to any gasoline storage and dispensing facility at which gasoline is transferred into motor vehicle fuel tanks except as provided in Section 4.0.

3.0 Definitions
For the purpose of this rule, the following definitions shall apply:
3.1 Balance System: A certified Phase II vapor recovery system that operates on the principle of vapor displacement.

3.2 Certified Phase II Vapor Recovery System: a vapor recovery system which has been certified by the California Air Resources Board (CARB) pursuant to Section 41954 of the California Health and Safety Code. For the purpose of this rule the term certified shall refer to CARB certification.

3.3 Existing Dispensing Facility: a gasoline dispensing facility which was in existence on or before May 21, 1992.

3.4 Gasoline: any petroleum distillate, or petroleum distillate/alcohol blend or alcohol having a Reid vapor pressure of four (4) pounds per square inch or greater, which is used as a motor vehicle fuel, or any fuel which is commonly or commercially known or sold as gasoline.

3.5 Gasoline Storage and Dispensing Facility: an aggregate of one or more stationary storage containers, any of which is subject to the provisions of Rule 4621 (Gasoline Transfer into Stationary Storage Containers, Delivery Vessels, and Bulk Plants) and this rule together with dispensers and control equipment required by the rules.

3.6 Gasoline Vapors: the organic compounds in the displaced vapors including any entrained liquid gasoline.

3.7 Hold-Open Latch: the integral component of a gasoline dispensing nozzle which permits the nozzle to remain open without a sustained effort on the part of the refueler.

3.8 Leak: the dripping of liquid volatile organic compounds at a rate of three or more drops per minute, or vapor volatile organic compounds in excess of 10,000 ppm as equivalent methane as determined by the test method in Section 6.3.3.

3.9 Motor Vehicle: any self-propelled vehicle registered for use on the highways.

3.10 Retail Service Station: any new or existing motor vehicle fueling service station subject to payment of California sales tax on gasoline sales.

3.11 Topping Off: to attempt to dispense gasoline to a motor vehicle fuel tank after a vapor recovery dispensing nozzle has shut off automatically. The filling of a vehicle tank which can be filled only after the seal between the fill pipe and the nozzle is broken, due to the nature and configuration of the fill pipe which causes premature shut-off of the dispensing nozzle, shall not be considered topping off.

4.0 Exemptions

5.0 Requirements 6.0 Administrative Requirements  
Number of gasoline dispensing nozzles per facility
Test Year
12 or more
6 to 11
3 to 5
  7.0 Compliance Schedule due to Loss of Exemption
Any person who becomes subject to the requirements of this rule through loss of exemption shall comply with the following increments of progress: