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UNDERGROUND STORAGE TANK SYSTEM SECONDARY CONTAINMENT TESTING REQUIREMENTS Authority Cited: California Health and Safety Code (HSC); Title 23 California Code of Regulations (23 CCR) A. Scope This document addresses periodic testing of underground storage tank (UST) secondary containment systems. It supplements State Water Resources Control Board (SWRCB) Local Guidance Letter LG‐160, which is available online at www.waterboards.ca.gov/water_issues/programs/ust/leak_prevention/lgs/. For compliance purposes, refer to the actual text of the regulations since the wording in this document summarizes requirements. All Unidocs forms and documents are available at www.unidocs.org. B. General Requirements for Secondary Containment Testing 1.Secondary containment must be tested for tightness upon installation, six months after installation1 and every 36 months thereafter, within 30 days of completion of a repair to a secondary containment component, and within 30 days of the date of discontinuing the use of a method of continuous monitoring that automatically monitors the integrity of both the primary and secondary containment such as components that are hydrostatically monitored or under constant vacuum or pressure. [23 CCR §2637(a)(1)] 2.Periodic testing must be completed anytime before or during the month the testing is required. 2 [23 CCR §2620(e)] 3.Secondary containment equipped with continuous interstitial monitoring that automatically monitors both primary and secondary containment, such as systems that are hydrostatically monitored or under constant vacuum or pressure, is not required to be periodically tested. [23 CCR §2637(a)(2)] 4.Testing must be performed by a UST Service Technician meeting the requirements of 23 CCR §2715(f). [23 CCR §2637(d)] 5.For UST Service Technicians conducting secondary containment testing, the requirement to be trained and certified by the equipment manufacturer may be obtained through certification by the manufacturer of the secondary containment system being tested or through the developer of the testing equipment or test method being used. [23 CCR §2715(f)(2)(A)] 6.In the event that no training or certification exists that would satisfy the above criteria, the local UST Program Unified Program Agency (UPA) may approve comparable alternate training or certification. [23 CCR §2715(f)(2)(E)] 7.Testing of the following secondary containment components is recommended but not required: Secondary containment for tank riser pipes and underground vent lines connected to a UST installed between July 2, 1987 and June 30, 2003, where the tank is equipped with overfill prevention in accordance with 23 CCR §2635(c)(1)(B) or (C).3 [23 CCR §2636(a)(1)] 1 Per SWRCB guidance, the six month re‐test is required after installation of piping, sumps, under dispenser containment (UDC), or other components that require “breaking concrete.” Components, such as replacement penetration fittings where all installation work is done inside containment sumps, do not require the six month re‐test. 2 A UST owner or operator may change the due date of the test by performing testing early, but a test conducted late will not change the due date. A UST owner or operator that performs a test early may not return to the original due date and must perform the next test before the end of the new 36 calendar month period. 3 Refer to the Unidocs Underground Storage Tank System Overfill Prevention Equipment Inspection Requirements (UN‐117) for details.