D.C. Mun. Regs. tit. 20, r. 20-5902
Each owner or operator of an UST shall ensure that repairs are made using the proper materials and techniques, and that repairs will prevent releases due to structural failure or corrosion as long as the UST is used to store regulated substances.
Except as stated in §§ 5902.3 and 5902.4, in complying with the requirements of this section, each owner or operator shall follow one of the following codes of practice, or an alternative industry standard or code of practice approved by the Department in accordance with § 5506:
Repairs to fiberglass-reinforced plastic tanks may be made by the manufacturer's authorized representatives or in accordance with § 5902.2.
Repairs to or replacement of internal tank linings may be made by the manufacturer's authorized representatives or in accordance with § 5902.2.
Metal pipe sections and fittings from which a release of a regulated substance has occurred as a result of corrosion or other damage, or that have incurred corrosion or other damage sufficient to constitute a threat of release, shall be replaced in accordance with § 5704.
Non-corrodible or fiberglass pipes and fittings, or flexible pipes, from which a release of a regulated substance has occurred as a result of damage, or that have incurred damage sufficient to constitute a threat of a release, shall be replaced in accordance with § 5704 and the manufacturer's specifications.
Within thirty (30) days of completing a repair to secondary containment areas of the tanks and piping used for interstitial monitoring, or a repair to containment sumps used for interstitial monitoring of piping, and before using the tank to store regulated substances, the owner or operator shall have the secondary containment tested for liquid-tightness according to the manufacturer's instructions, one of the following codes of practice, or an alternative industry standard or code of practice approved by the Department in accordance with § 5506:
Within thirty (30) days of completing a repair to a tank or piping, other than a repair specified in § 5902.7, and before using the tank to store regulated substances, the owner or operator shall have the tank or piping tested for liquid-tightness in accordance with § 6007, unless one or more of the following actions have been taken:
Within six (6) months following the repair of any cathodically protected UST system, the cathodic protection system shall be tested in accordance with the applicable provisions of §§ 5901.3 through 5901.5 to ensure that it is operating properly.
Each owner or operator shall maintain records of each repair for 10 years, or until the UST system is permanently closed, whichever is longer, in accordance with § 5602.4.
Each owner or operator shall ensure that each UST system is repaired by, or that repairs are supervised by, an UST System Technician certified by the Department in accordance with Chapter 65.
After the completion of any replacement or repair that results in a change in the information on the UST facility notification form, the owner or operator shall ensure that the certified UST System Technician completes the certification of compliance provided on the UST facility notification form required by § 5600.
A repair that involves removing and replacing fifty percent (50%) or more of the piping, excluding connectors, connected to a single underground tank is considered to be a replacement and shall meet the new piping installation requirements in § 5704.
Within thirty (30) days of any repair to spill or overfill prevention equipment, the repaired equipment shall be tested or inspected, as appropriate, in accordance with § 5900 to ensure it is operating properly.
D.C. Mun. Regs. tit. 20, r. 20-5902