The client owns and operates a 10,000 gallon aboveground storage tank for fuel oil that was installed in 1968 when the facility was used by another company as a distribution warehouse. The AST provided fuel to the boiler system used to heat an unoccupied warehouse area. In accordance with 502 CMR 5.00, all ASTs that are greater than 10,000 gallons in capacity are required to undergo an annual inspection by a qualified tank inspector. CAPACCIO determined that the AST was a shop fabricated, Steel Tank Institute (STi) Category 1 that had been installed for at least 20 years, and was required to undergo formal external inspection, including ultrasonic thickness testing (UTT). The State Fire Marshal’s Office allows shop fabricated tanks to be inspected either by STi or API standards. The STi standards require external UTT every 20 years while API standards, originally developed for field fabricated oil tanks require internal inspection every 10 years. CAPACCIO recommended the STi standards inspection approach. The tanks were found to be in compliance and the necessary reports were filed. There was no record of an annual inspection or UTT tank inspection. CAPACCIO’S Massachusetts Registered Professional Engineer (PE) inspected the AST under 502 CMR 5.00, “Permit Requirements and Annual Inspection of Aboveground Storage Tanks or Containers of More Than Ten-Thousand Gallons Capacity.” CAPACCIO invited representatives of the local fire department and State Fire Marshal’s Office to witness the inspections and also submitted the completed forms with the required fees to the Massachusetts Office of the State Fire Marshal as required.