# COMAR Title 26 — Department of the Environment

## Subtitle 10 — Oil Pollution Control and Storage Tank Management

### Chapter 18 — Field-Erected Aboveground Storage Tanks

#### Regulation .04 Performance Standards for a Field-Erected AST System.

*COMAR 26.10.18.04*

An owner, an operator, and a person in charge of an AST system with a field-erected AST shall:

A. Ensure the field-erected AST is:

  (1) Properly designed for the oil storage application and type of oil to be stored;

  (2) Constructed of welded carbon steel or stainless steel; and

  (3) Constructed to an industry standard, including an API standard for field-erected ASTs incorporated by reference in COMAR 26.10.01.03;

B. Ensure the foundation of the field-erected AST:

  (1) Is designed and constructed in accordance with Annexes B and I of API Standard 650 “Welded Tanks for Oil Storage” to prevent settlement of the foundation and the AST due to soil bearing capacity and other site conditions using:

    (a) Field and laboratory testing; and

    (b) Analyses and other sound engineering practices performed by a professional engineer;

  (2) Is capable of supporting the load of the AST and its contents without excessive differential settlement; and

  (3) Provides positive drainage of water away from the AST base; and

C. Test a new, repaired, or relocated AST system for tightness in accordance with NFPA 30 “Flammable and Combustible Liquids Code”:

  (1) Upon completion of the installation or repair of the AST system; and

  (2) Before placing the AST system in-service