California Code of Regulations › Title 23 - Waters › Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards › Chapter 16 - Underground Tank Regulations › Article 3 - New Underground Storage Tank Design, Construction, and Monitoring Requirements › Section 2635 - Installation and Testing Requirements for All New Underground Storage Tanks

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
				  Primary and secondary containment systems shall be designed, constructed,
				  tested, and certified to comply, as applicable, with all of the following
				  requirements:
(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 once every 36
				  months 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 every 60
				  days to ensure that they are in proper working order. On and after October 1,
				  2018, cathodic protection systems shall be tested within six months of the date
				  of the completion of a repair to the cathodic protection system.
(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.
				  Pre-engineered corrosion protection systems with sacrificial anodes shall be
				  checked once every 36 months in accordance with the manufacturer's
				  instructions. On and after October 1, 2018, corrosion protection systems with
				  sacrificial anodes shall be checked within six months of the date of the
				  completion of a repair to the cathodic protection system.
(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 three pounds per square inch (20.68 kilopascals) and not more than
				  five pounds per square inch (34.48 kilopascals). 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 manufacturer's 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 subdivision (f) 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.