# COMAR Title 26 — Department of the Environment

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

### Chapter 17 — Shop-Fabricated Aboveground Storage Tanks

#### Regulation .06 Performance Standards for Piping.

*COMAR 26.10.17.06*

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

A. If installing or relocating a shop-fabricated AST on or after June 13, 2022, install piping that does not penetrate a secondary containment dike, unless otherwise approved by the Department;

B. Ensure an existing shop-fabricated AST meets the following requirements:

  (1) For piping connected to an AST penetrating a secondary containment dike:

    (a) Obtain approval from the Department to leave the piping in place; or

    (b) Properly abandon and replace the piping not later than 1 year after June 13, 2022 with piping that does not penetrate the secondary containment dike; and

  (2) For underground piping connected to an AST, ensure the piping complies with the underground piping requirements in §E of this regulation not later than 1 year after June 13, 2022;

C. Ensure an aboveground piping system connected to a shop-fabricated AST is:

  (1) Constructed of carbon steel, alloy steel, or stainless steel piping;

  (2) Compatible with the type of oil transferred in the piping;

  (3) Designed and constructed in accordance with recognized industry standards;

  (4) Liquid tight;

  (5) Properly supported by permanent bracing to prevent structural weaknesses; and

  (6) Protected against physical damage;

D. Ensure a piping system installed aboveground or inside of a building is not constructed with:

  (1) Low melting point materials, such as aluminum, copper, or brass;

  (2) Materials that soften on fire exposure, such as plastics; or

  (3) Non-ductile materials, such as cast iron;

E. If installing an underground piping system, comply with the following requirements:

  (1) Install the piping system, including containment sumps, in accordance with the performance standards in COMAR 26.10.03.02 and .03A(3);

  (2) Installation of the piping system is performed in the continuous on-site presence and under the direction of a certified UST system technician, as required under COMAR 26.10.02.03D;

  (3) Test the piping system for tightness in accordance with COMAR 26.10.03.05 and 26.10.05.02D;

  (4) Test the containment sumps for tightness in accordance with COMAR 26.10.03.03A(3);

  (5) Provide a method of leak detection in accordance with COMAR 26.10.05.02D;

  (6) Maintain the containment sumps clean and free of liquid; and

  (7) If a test for tightness conducted in accordance with §E(3) or (4) of this regulation results in a failed test result or a leak is found:

    (a) Report the failed test result to the Department within 2 hours in accordance with COMAR 26.10.08.01; and

    (b) Follow the investigation and confirmation procedures in COMAR 26.10.08.03, including making repairs and retesting the piping system and containment sumps for tightness.