Beginning not later than 90 days after June 13, 2022, an owner and an operator of a UST system shall conduct a periodic operation and maintenance walkthrough inspection in accordance with: The inspection procedures under §B or C of this regulation; and The recordkeeping requirements under §D of this regulation. An owner and an operator of a UST system may meet the inspection requirements in §A(1) of this regulation by, at a minimum, checking: The spill prevention equipment: On a monthly basis or, if the UST system receives deliveries at intervals greater than 30 days, prior to each delivery; and By completing the following tasks: Visually checking the equipment for damage; Removing liquid and debris from the equipment; Checking for and removing obstructions in the fill pipe; Checking the fill cap to ensure the cap is securely on the fill pipe; and For double-walled spill prevention equipment with interstitial monitoring, checking for a release in the interstitial area; On a monthly basis, the release detection equipment to ensure: The equipment is operating with no alarms or other unusual operating conditions present; and The records of release detection testing are reviewed and are current; On an annual basis, the containment sumps by: Visually checking the containment sumps for damage; Checking for a release in the containment area and a spill, release, or discharge to the environment; Removing liquid and debris from the containment sumps; and For double-walled containment sumps with interstitial monitoring, checking for a release in the interstitial area; and On an annual basis, the hand held release detection equipment by checking devices such as storage tank gauging sticks and groundwater bailers for operability and serviceability. An owner and an operator of a UST system may meet the inspection requirements in §A(1) of this regulation by using an alternative procedure: Established in guidance developed by the Department or a standard code of practice developed by a nationally recognized association incorporated by reference under COMAR 26.10.01.03; and That checks equipment comparable to the equipment required to be checked under §B of this regulation. An owner and an operator of a UST system shall maintain records of the operation and maintenance walkthrough inspections: In accordance with Regulation .05 of this chapter; For at least 1 year at the regulated substance storage facility where the UST system is located; For at least 5 years at a location designated by the owner; and That include the following information: A list of each area checked during the inspection; Whether an area inspected was acceptable or needed action taken; If an action was taken to correct an issue, a description of the action taken; and Delivery records if the spill prevention equipment is checked prior to a delivery because deliveries occur at intervals greater than 30 days.