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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 20. ENVIRONMENT |
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Chapter 20-57. UNDERGROUND STORAGE TANKS - NEW TANK PERFORMANCE STANDARDS |
Section 20-5701. NEW PETROLEUM UST SYSTEMS
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5701.1Except as provided in § 5700.10, each new petroleum underground storage tank, except for heating oil USTs, shall be constructed of:
(a)Fiberglass-reinforced plastic with double-walled construction or other secondary containment system as set forth in §§ 5701.4, 5701.5, and 5701.6;
(b)Steel-fiberglass-reinforced plastic composite with double wall construction or other secondary containment system as set forth in §§ 5701.4, 5701.5, and 5701.6; or
(c)Steel with double-walled construction or other secondary containment system as set forth in §§ 5701.4, 5701.5 and 5701.6, and the tank shall be cathodically protected in accordance with the requirements of § 5701.2.
5701.2Each steel tank shall be cathodically protected by being coated with a suitable dielectric material, and in addition:
(a)Field-installed cathodic protection systems shall be designed by a corrosion expert; and
(b)Impressed current cathodic protection systems shall be designed to allow determination of current operating status as required by § 5901.6.
5701.3Each cathodic protection system shall be operated and maintained in accordance with § 5901.
5701.4Secondary containment systems shall be designed, constructed, and installed to do the following:
(a)Contain regulated substances released from the tank system until they are detected and removed;
(b)Prevent the release of regulated substances to the environment at any time during the operational life of the UST system; and
(c)Check for evidence of a release at least every thirty-(30) days.
5701.5Double-walled tanks shall be designed, constructed, and installed to do the following:
(a)Contain a release from any portion of the inner tank within the outer wall; and
(b)Detect the failure of the inner wall.
5701.6External liner systems (including vaults) shall be designed, constructed, and installed to do the following:
(a)Contain one hundred ten percent (110%) of the capacity of the largest tank within its boundary;
(b)Prevent the interference of precipitation or ground-water intrusion with the ability to contain or detect a release of regulated substances; and
(c)Surround the tank completely and be capable of preventing lateral, as well as vertical migration of regulated substances.
5701.7All new motor fuel dispenser systems shall contain under-dispenser containment.
(a)Under-dispenser containment shall be designed, constructed and installed to prevent leaks from the dispenser from reaching soil or groundwater. Such containment must:
(1)Be liquid-tight on its sides, bottom, and at any penetrations;
(2)Be compatible with the substance conveyed by the piping; and
(3)Allow for visual inspection and access to the components in the containment system and/or be monitored to detect a failure of the containment system.