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Summary Table of Underground Storage Tank (UST) Leak Prevention & Enforcement Provisions of AB 2481 (Statutes 2002, Chapter 999) Effective January 1, 2003 UST Systems Installed After July 1, 2003 NOTE: Items 1 —6 apply only to UST systems installed after July 1,2003. Item Summary of Requirement Citation(s) 1 Primary and secondary containment must be "product H&S Code §25290.1(a), (c)(1), tight." "Product tight'means impervious to the liquid (c)(2) and vapor of the stored substance,to prevent seepage from containment. 2 Secondary containment must be constructed to prevent H&S Code §25290.1(c)(3) water intrusion into the UST system by precipitation, infiltration, or surface runoff. 3 The UST system must be designed and constructed with a H&S Code §25290.1(d) continuous monitoring system capable of(1)detecting entry of the liquid or vapor-phase substance stored in the primary containment into the secondary containment and (2)detecting water intrusion into the secondary containment. 4 The interstitial space of the UST must be maintained H&S Code §25290.1(e) under constant vacuum or pressure to detect a breach in the primary or secondary containment before the liquid or vapor of the stored substance is released to the environment. Interstitial liquid level measurement methods satisfy this requirement. (Note: Annual line tightness testing on pressurized piping will no longer be re uired for UST systems installed after July 1,2003. 5 Vent lines,vapor recovery lines, and fill pipes that are H&S Code §25290.1(k) beneath the surface of the ground are defined as pipe and therefore part of the UST system,which means they must have secondary containment. 6 The UST must be tested after installation(but before H&S Code §25290.10) being put into service)using one of the following: enhanced leak detection(ELD),an inert gas pressure test certified by a third-party and approved by the State Water Resources Control Board(SWRCB),or a test method deemed equivalent to ELD and approved by the SWRCB in regulation. (Note: The UST tightness test at start-up will no longer be required for UST systems installed after July 1,2003. PLEASE NOTE the difference between the terms"UST"and"UST System." UST means tanks and piping used for the storage of a hazardous substance [H&S Code, §25281(x)(1)]. UST system means an underground storage tank,connected piping,ancillary equipment and containment systems[H&S Code,§25281(y)]. SWRCB Summary of AB 2481 1 of 4 12/11/02 Statutes 2002,Chapter 999