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s , Cal. Code Regs. Title 23, Division 3, Chapter 16, Underground Tank Regulations (1) All underground storage tanks shall be tested at the factory before being transported.The tests shall determine whether the tanks were constructed in accordance with the applicable sections of the industry code or engineering standard under which they were built. (2) The outer surface of underground storage tanks constructed of steel shall be protected from corrosion as follows, except that primary containment systems installed in a secondary containment system and not backfilled do not need cathodic protection: (A) Field-installed cathodic protection systems shall be designed and certified as adequate by a corrosion specialist. The cathodic protection systems shall be tested by a cathodic protection tester within six months of installation and at least every three years thereafter.The criteria that are used to determine that cathodic protection is adequate as required by this section shall be in accordance with a code of practice developed in accordance with voluntary consensus standards. Impressed-current cathodic protection systems shall also be inspected no less than every 60 calendar days to ensure that they are in proper working order. (B) Underground storage tanks protected with fiberglass-reinforced plastic coatings, composites, or equivalent non-metallic exterior coatings or coverings, including coating/sacrificial anode systems, shall be tested at the installation site using an electric resistance holiday detector.All holidays detected shall be repaired and checked by a factory authorized repair service before installation. During and after installation,care shall be taken to prevent damage to the protective coating or cladding. Preengineered corrosion protection systems with sacrificial anodes shall be checked once every three years in accordance with the manufacturer's instructions. (3) Before installation,the tank shall be tested for tightness at the installation site in accordance with the manufacturer's written guidelines. If there are no guidelines, the primary and secondary containment shall be tested for tightness with air pressure at not less than 3 pounds per square-inch(20.68 k Pa)and not more than 5 pounds per square-inch (34.48 k Pa). In lieu of the above,an equivalent differential pressure test,expressed in inches of mercury vacuum, in the interstitial space of the secondary containment, is acceptable.The pressure(or vacuum in the interstitial space) shall be maintained for a minimum of 30 minutes to determine if the tank is tight. If a tank fails the tightness test, as evidenced by soap bubbles, or water droplets, installation shall be suspended until the tank is replaced or repaired by a factory authorized repair service. Following repair or replacement,the tank shall pass a tightness test. (4) All secondary containment systems shall pass a post-installation test which meets the approval of the local agency. (5) After installation, but before the underground storage tank is placed in service, a tank integrity test shall be conducted to ensure that no damage occurred during installation.The tank integrity test is not required if the tank is equipped with an interstitial monitor certified by a third-party evaluator to meet the performance standards of a"tank integrity test"as defined in section 2611, or if the tank is tested using another method deemed by the State Water Resources Control Board to be equivalent. (6) All underground storage tanks shall be installed according to a code of practice developed in accordance with voluntary consensus standards and the manufacturers written installation instructions.The owner or operator shall certify that the underground storage tank was installed in accordance with the above requirements as required by subsection (d) of this section. (7) All underground storage tanks subject to flotation shall be anchored using methods specified by the manufacturer or, if none exist,shall be anchored according to the best engineering judgment. (b) All underground storage tanks shall be equipped with a spill container and an overfill prevention system as follows: (1) The spill container shall collect any hazardous substances spilled during product delivery operations to prevent the hazardous substance from entering the subsurface environment.The spill container shall meet the following requirements: (A) If it is made of metal,the exterior wall shall be protected from galvanic corrosion. (B) It shall have a minimum capacity of five gallons(19 liters). (C) It shall have a drain valve which allows drainage of the collected spill into the primary container or provide a means to keep the spill container empty. (2) The overfill prevention system shall not allow for manual override and shall meet one of the following requirements: (A) Alert the transfer operator when the tank is 90 percent full by restricting the flow into the tank or triggering an audible and visual alarm; or -19- C