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Upgrade, New Construction, and Compatibility Requirements California Code of Regulations, Title 23, Division 3, Chapter 16, Sections 2631(1), 2635(d), 2636(f)(5), 2640.1, 2665(b), (c), 2666(b)(2), (e)(2), & (f), 2711(c), & 2712(b)(5) Compatibility Requirements Upon Installation Are additional compatibility documents required prior to constructing a UST system? Yes. For all USTs installed on or after October 1, 2018, the UST owner or operator must demonstrate compatibility at the time of installation for all components of the UST system that may come into contact with the substance stored. The additional components for which compatibility must be demonstrated include, but are not limited to, spill containers, overfill prevention equipment, and ancillary equipment. Compatibly for the above listed components may be demonstrated through a written approval from an independent testing organization, a California registered professional engineer, or the manufacturer of the component. The approval must indicate that the components are compatible with the specific substance to be stored. The documents demonstrating compatibility must be provided to the Unified Program Agency (UPA) as part of the application for a UST operating permit and must be retained by the UST owner or operator for as long as the UST stores that specific substance. The acceptable mechanisms to demonstrate compatibility for each UST component type can be found in the table in Appendix 1 of this document. [References cited: §§ 2631(1) & 2712(b)(5).] Changing the Substance Stored Are compatibility documents required to be submitted prior to changing the substance stored in the UST system? Yes. UST owners or operators must notify the UPA in writing at least 30 days prior to changing the substance stored in the UST and identify the substance to be stored, the date when that substance will begin to be stored, and provide compatibility documentation for all components of the UST system that may come into contact with the substance to be stored. These UST components include, but are not limited to, primary containment, secondary containment, spill containers, overfill prevention equipment, ancillary equipment, and leak detection equipment. The compatibility documentation must be maintained for as long as the specific substance is being stored. The acceptable mechanisms to demonstrate compatibility for each UST component type can be found in the table in Appendix 1 of this document. [References cited: §§ 2711(c) & 2712(b)(5).] Page 3 of 5 January 2019,v 1.0