In this chapter: A term in §B of this regulation has the meaning indicated; and A term not defined in §B of this regulation has: The meaning given to the term in a relevant statute or COMAR 26.10.01 or 26.10.02; or If not defined in a relevant statute or COMAR 26.10.01 or 26.10.02, the meaning attributed by common use. Terms Defined. “AST” has the meaning stated in COMAR 26.10.01.02B. “AST system” has the meaning stated in COMAR 26.10.01.02B. “Authorized inspector” means an individual qualified and certified to inspect an AST under API Standard 653 “Tank Inspection, Repair, Alteration, and Reconstruction”. “Coating” means a protective material applied to or bonded to an internal or external AST surface, including paint, protective metals, adhered plastic, or polyolefin materials. Critical High Level. “Critical high level” means the highest level in a field-erected AST that oil can reach without detrimental impacts, such as an overflow of oil from the AST or damage to the AST. “Critical high level” includes the design liquid level of a field-erected AST as determined by the AST manufacturer. “Existing” means the installation or construction of an AST, an AST system, or a secondary containment dike was complete before June 13, 2022. “External inspection” means a formal inspection of an AST to assess all aspects of the storage tank possible without suspending operations or requiring an AST shutdown, performed by or under the supervision of an authorized inspector in accordance with API Standard 653 “Tank Inspection, Repair, Alteration, and Reconstruction” and Regulation .11F of this chapter. Field-erected AST. “Field-erected AST” means an AST that is: Welded carbon steel or stainless steel; Erected or constructed by assembling the AST on-site at an oil storage facility; and Erected or constructed for the purpose of storing oil. “Field-erected AST” includes an AST that: Has a nameplate or other identifier that indicates it is a field-erected AST; or Is not identified as a shop-fabricated AST. “Formal inspection” means a documented external inspection or internal inspection of an AST conducted by or under the supervision of an authorized inspector in accordance with API Standard 653 “Tank Inspection, Repair, Alteration, and Reconstruction” and Regulation .11 of this chapter. “High-high level” means a level in a field-erected AST established under Regulation .07 of this chapter that: Is sufficiently below the critical high level of the AST; and Enables the termination of an oil delivery or transfer before the critical high level in the AST is reached. “Internal inspection” means a formal and complete inspection of an emptied and cleaned AST performed under the supervision of an authorized inspector in accordance with API Standard 653 “Tank Inspection, Repair, Alteration, and Reconstruction” and Regulation .11H of this chapter. Maximum Working Level. “Maximum working level” means a liquid level of a field-erected AST that should not be exceeded during normal filling procedures and is at least 3 inches below the high-high level of the AST. “Maximum working level” includes the normal fill level. “New” means the installation or construction of an AST, an AST system, or a secondary containment dike was complete on or after June 13, 2022. Out-of-Service. “Out-of-service” means an AST system in which the owner, the operator, and the person in charge of the AST system has: Emptied the AST system of all oil and sludge; and Designated the AST system as out-of-service in accordance with Regulation .12 of this chapter. “Out-of-service” includes a change-in-service in which an AST system is emptied of all oil and sludge in order to store a non-oil product. “Overfill” means an occurrence when an AST is filled beyond its critical high level and may result in a spill, release, or discharge of oil. Repair. “Repair” means work necessary to maintain or restore an AST system to a safe operating condition using industry approved standards. “Repair” may include Removing and replacing the roof, shell, or bottom material to maintain AST integrity or ancillary AST equipment; Re-leveling of an AST’s shell, bottom, or roof; Adding or replacing reinforcing plates to existing shell penetrations; and Correcting flaws, such as tears or gouges, by grinding or gouging followed by welding. Secondary Containment Dike. “Secondary containment dike” means a secondary containment system that confines a spill, release, or discharge of oil from an AST or piping within the secondary containment system. “Secondary containment dike” includes diking and a dike. “Storage tank strapping record” means a current, up-to-date storage tank record for a field-erected AST that: Is developed by an owner, an operator, and a person in charge of an AST system; and Identifies, by calculations, the following levels of concern: Maximum working level; High-high level; and Critical high level.