5701 NEW PETROLEUM UST SYSTEMS

5701.1 Except as provided in § 5700.10, each new petroleum underground storage tank, except for heating oil USTs, shall be constructed of:

(a) Fiberglass-reinforced plastic with double-walled construction or other secondary containment system as set forth in §§ 5701.4, 5701.5, and 5701.6;

(b) Steel-fiberglass-reinforced plastic composite with double wall construction or other secondary containment system as set forth in §§ 5701.4, 5701.5, and 5701.6; or

(c) Steel with double-walled construction or other secondary containment system as set forth in §§ 5701.4, 5701.5 and 5701.6, and the tank shall be cathodically protected in accordance with the requirements of § 5701.2.

5701.2 Each steel tank shall be cathodically protected by being coated with a suitable dielectric material, and in addition:

(a) Field-installed cathodic protection systems shall be designed by a corrosion expert; and

(b) Impressed current cathodic protection systems shall be designed to allow determination of current operating status as required by § 5901.6.

5701.3 Each cathodic protection system shall be operated and maintained in accordance with § 5901.

5701.4 Secondary containment systems shall be designed, constructed, and installed to do the following:

(a) Contain regulated substances released from the tank system until they are detected and removed;

(b) Prevent the release of regulated substances to the environment at any time during the operational life of the UST system; and

(c) Check for evidence of a release at least every thirty-(30) days.

5701.5 Double-walled tanks shall be designed, constructed, and installed to do the following:

(a) Contain a release from any portion of the inner tank within the outer wall; and

(b) Detect the failure of the inner wall.

5701.6 External liner systems (including vaults) shall be designed, constructed, and installed to do the following:

(a) Contain one hundred ten percent (110%) of the capacity of the largest tank within its boundary;

(b) Prevent the interference of precipitation or ground-water intrusion with the ability to contain or detect a release of regulated substances; and

(c) Surround the tank completely and be capable of preventing lateral, as well as vertical migration of regulated substances.

SOURCE: Final Rulemaking published at 40 DCR 7835, 7853 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999).