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Cal. Code Regs. Title 23, Division 3, Chapter 16, Underground Tank Regulations Article 3. New Underground Storage Tank Design, Construction, and Monitoring Requirements § 26.30. General Applicability of Article. (a) The requirements in this article apply to owners of new underground storage tanks. In addition, the applicable repair and upgrade requirements in Artielc 6 shall be complied with. (b) Sections 2631 and 2632 specify design, construction, and monitoring requirements for all new underground storage tanks. Sections 2633 and 2634 specify altemate design, construction, and monitoring requirements, in lieu orthose specified in sections 2631 and 2632, for underground storage tanks installed before January 1, 1997 which store only motor vehicle fuel. Underground storage tanks constructed pursuant to the requirements specified in section 2633 in lieu of those specified in section 2631shall be monitored in accordance with section 2634, (c) All new underground storage tanks, piping, and secondary containment systems shall comply with sections 2635 and 2636 (d) All monitoring equipment used to satisfy the requirements of this article shall meet the requirements of section 2643(f) and shall he installed and maintained such that the equipment is capable of detecting a leak at the earliest possible opportunity. Additionally, all monitoring equipment used to satisfy the requirements of this article shall be installed, calibrated, operated, and maintained in accordance with section 2638. Authority: Sections 25299.3 and 25299.7, Health and Safety Code. Reference; Sections 25281, 25284.1, 25291 and 25292.3, Health and Safety Code; 40 CFR 280.20. § 2631. Design and Construction Requirements for New Underground Storage Tanks. (a) All new underground storage tanks including associated piping used for the storage of hazardous substances shall have primary and secondary containment. Primary containment shall be product -tight. Secondary containment may be manufactured as an integral part of the primary containment or it may be constructed as a separate containmeltl system. Secondary containment systems shall be designed and constructed such that the secondary containment system can be periodically tested in accordance with section 2637(a). (b) The design and construction of all primary containment including any integral secondary containment system, shall be approved by an independent testing organization in accordance with industry codes, voluntary consensus standards, or engineering standards. All other components used to construct the primary containment system, such as special accessories, fittings, coatings or linings, monitoring systems and level controls shall also be approved by an independent testing organization. This requirement became effective on July 1, 1991 for underground storage tanks; January 1, 1992 for piping; and shall be effective on January 1, 1995 for all other components. The exterior surface of underground storage tanks shall bear a marking, code stamp, or label showing the following minimum information: (t) Engineering standard used; (2) Nominal diameter in feet; (3) Nominal capacity in gallons; (4) Degree of secondary containment; (5) Useable capacity in gallons; (6) Design pressure in psig; (7) Maximum operating temperature in degrees Fahrenheit; (8) Construction materials; (9) Year manufactured; and (10) Identity of manufacturer. (c) A primary containment system with or without an integral secondary containment system shall have wear plates (striker plates) installed, center to center, below all accessible openings. The plates shall be made of steel or other appropriate material if steel is not compatible with the hazardous substance stored. The width of the plate shall be at least eight inches on each side, or shall be equal to the area of the accessible opening or guide tube, whichever is larger. The thickness of the steel plate shall be at least 118 inch and those made of other materials shall be of sufficient thickness to provide equivalent protection. The plate, if under 114 inch thick, shall be rolled to the contours of the underground storage tank and all plates shall be honded or lack welded in place. A drop tubc-mounted bottom protector may fulfill this requirement.