5703 NEW HEATING OIL UST SYSTEMS

5703.1 Each heating oil tank with a capacity of one thousand one hundred (1,100) gallons or more and was installed after November 12, 1993, whether of single or double-walled construction, shall be constructed of the following:

1. (a) Fiberglass-reinforced plastic;
2. (b) Steel-fiberglass-reinforced plastic composite; or
3. (c) Steel, which must be cathodically protected in accordance with the requirements of § 5703.2.

5703.2 Each steel tank shall be cathodically protected by being coated with a suitable dielectric material, and:

1. (a) The field-installed cathodic protection systems shall be designed by a corrosion expert; and
2. (b) The impressed current cathodic protection system shall be designed to allow determination of current operating status as required by § 5901.5.

5703.3 Each cathodic protection system shall be operated and maintained in accordance with the requirements of § 5901.

5703.4 Each heating oil tank with a capacity of one thousand one hundred (1,100) gallons or more, and installed after November 12, 1993, shall have a secondary containment system that is designed, constructed, and installed in a manner that will:

1. (a) Contain regulated substances released from the tank system until they are detected and removed;
2. (b) Prevent the release of regulated substances to the environment at any time during the operational life of the UST; and
3. (c) Check for evidence of a release at least every thirty (30) days.

5703.5 If continuous monitoring methods are not used, each secondary containment system shall be tested every three (3) years to ensure that the interstitial area is liquid-tight.

5703.6 A tank that is double-walled shall be designed, constructed, and installed in a manner that will:

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

(b) Allow for the detection of the failure of the inner wall.

5703.7 External liner systems, including vaults, shall be designed, constructed, and installed in a manner that will:

(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.

5703.8 An upgrade of a heating oil tank is considered a new installation and shall conform to all new installation provisions in this chapter.

SOURCE: Final Rulemaking published at 40 DCR 7835 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999); as amended by Final Rulemaking published at 56 DCR 6678 (August 21, 2009); as amended by Final Rulemaking published at 67 DCR 1778 (February 21, 2020).