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UST System Secondary Containment Testing Requirements - Page 2 of 3 ❑ Secondary vapor recovery piping connected to a UST installed between July 2, 1987 and June 30, 2003 , if the piping is designed so that it cannot contain liquid - phase product . [23 CCR §2636(a )(2)] ❑ Secondary piping for a product line that has been verified as a safe suction system . [23 CCR §2636(a ) (3)] C . Test Methods and Procedures 1 . Secondary containment testing must be performed as follows : [23CCR §2637(c)] o In accordance with the manufacturer ' s guidelines or standards . ' o Using an applicable method specified in an industry code or engineering standard if there are no manufacturer 's guidelines or standards . o Using a test method approved by a state - registered professional engineer ( PE ) if there are no manufacturer 's guidelines, industry codes, or engineering standards . o Periodic testing must be conducted using a test procedure that demonstrates that the system performs at least as well as it did upon installation . For example, if the secondary containment system was tested upon installation by using a test method that applied a pressure of 5 p . s . i . for one hour, then the periodic test must be conducted using a method that tests the system at an equivalent pressure and for the same duration . 2 . Under no circumstances may any primary containment system for flammable or combustible liquids, or secondary containment system holding a potentially explosive atmosphere, be pressurized with air . 3 . When a manufacturer ' s installation guidelines/standards allow a choice between either pressure or vacuum testing of a tank annular space , it is recommended that vacuum testing be performed . If pressure testing is performed , the primary containment shall first be pressurized using nitrogen ( or other approved inert gas ) to a pressure equal to the intended secondary containment test pressure, so as to prevent undue stress to, or structural failure of, primary containment . Pressure shall be maintained on primary containment until pressure is released from the annular space at the conclusion of testing . 4 . When hydrostatic testing is performed , all water must be removed from the secondary containment at the conclusion of testing . Except is cases where water will be reused for additional testing, a hazardous waste determination must be performed to determine whether or not it is hazardous based on ignitability or toxicity ( e . g . , Benzene contamination ) and it must be disposed of properly based on the resu Its . [HSC §25291(e), 22 CCR §66262 . 11] 5 . Water removed from secondary containment systems, even if uncontaminated by hazardous materials, must not be disposed of to the storm water system . [Nonpoint source (Urban Ruoff) ordinances] ° Some manufacturers' test procedures allow for a " Pass" provided that a specified drop in pressure or vacuum is not exceeded . State law requires that UST systems installed after January 1, 1984 and prior to July 1, 2003 be product-tight [ HSC § 25291 ( a ) ( 1) ] , and that UST systems installed on or after July 1, 2003 be both product-tight and vapor-tight [ HSC § §25292 . 1 ( a ), 25292 . 1 ( c) ( 1) , 25290 . 2 ( a ), and 25290 . 2 ( c) ( 1 )] . When statute and regulations conflict, requirements of statute prevail . Unidocs Member Agency interpretation is that the regulatory wording of 23 CCR § 2637 ( c) is superseded by the product-tight and vapor-tight requirements of HSC, so no drop in pressure or vacuum is allowed for a passed secondary containment test. i i I