An owner and an operator of a UST system shall conduct repairs that: Prevent spills, releases, and discharges due to structural failure or corrosion for the entire period in which a UST system is used to store regulated substances; Comply with the applicable code of practices developed by a nationally recognized association incorporated by reference under COMAR 26.10.01.03; and Meet all of the requirements of this chapter. An owner and an operator of a UST system shall have repairs to the equipment and components of the UST system performed or supervised by a UST system technician certified in accordance with COMAR 26.10.06. Repair Procedures. An owner and an operator of a UST system: Upon approval of the Department, shall have repairs conducted on a fiberglass-reinforced plastic or steel UST: By an authorized representative of the UST manufacturer; or In accordance with a code of practice developed by a nationally recognized association incorporated by reference under COMAR 26.10.01.03; May not repair a UST by installing an internal liner; Shall replace a metal pipe that has sections or fittings in which corrosion or other damage has resulted in: A spill, release, or discharge of a regulated substance; or An imminent threat of a spill, release, or discharge of a regulated substance, as determined by the Department; Shall repair non-corrodible pipes and fittings in accordance with the manufacturer’s specifications; and Shall repair a containment sump with materials rated by the material manufacturer for the regulated substance stored in the UST system. Testing of Repaired UST Systems. An owner and an operator of a repaired UST system shall: Before placing the UST system back into service, conduct a precision tightness test in accordance with COMAR 26.10.03.05 to test the repaired UST and piping; Before placing the UST system back into service, test secondary containment areas of the UST, piping, and containment sumps in accordance with: The manufacturer’s instructions; A code of practice developed by a nationally recognized association incorporated by reference under COMAR 26.10.01.03; or Requirements established by the Department; and Within 6 months of completing a repair on a cathodically protected UST system, test the cathodic protection system: To ensure the cathodic protection system is operating properly; and In accordance with Regulation .02B of this chapter. Recordkeeping. In accordance with Regulation .05 of this chapter, an owner and an operator of a UST system shall maintain records of each repair conducted on the UST system until the UST system is permanently closed or undergoes a change-in-service pursuant to COMAR 26.10.10.02.