1. A. An owner and an operator of a UST system with a field-constructed tank greater than 50,000 gallons or an airport hydrant system may use single-walled piping when installing or replacing piping associated with the UST system.
2. B. An owner and an operator of a UST system with a field-constructed tank less than or equal to 50,000 gallons that is not part of an airport hydrant system shall meet the piping performance standards and secondary containment requirements of COMAR 26.10.03.02 when installing or replacing piping.

Authority: Environment Article, §§4-401, 4-402, 4-405, 4-407—4-411.2, 4-415.1, 4-417, 4-701 et seq., and 7-201 et seq., Annotated Code of Maryland

Effective date: February 15, 1993 (20:3 Md. R. 259)

Regulation .01 amended effective February 18, 2002 (29:3 Md. R. 224)

Regulation .04F amended effective December 6, 1993 (20:24 Md. R. 1865); July 15, 1996 (23:14 Md. R. 1011)

Regulation .04G amended effective July 15, 1996 (23:14 Md. R. 1011)

Regulation .05C, D amended effective December 6, 1993 (20:24 Md. R. 1865)

Regulation .06D amended effective July 15, 1996 (23:14 Md. R. 1011)

Regulation .07B amended effective July 15, 1996 (23:14 Md. R. 1011)

Regulation .08A, B amended effective December 6, 1993 (20:24 Md. R. 1865)

Regulations .01—.15 repealed and new Regulations .01—.07 adopted effective June 13, 2022 (49:12 Md. R. 642)