6003.1 Each owner or operator of a petroleum UST system shall provide release detection for tanks in accordance with the provisions of this section, except as provided elsewhere in Chapter 60.

6003.2 Each release detection method used to meet the requirements of this section shall be conducted in accordance with the applicable requirements for that method set forth in §§ 6005 through 6012 of this chapter.

6003.3 At least once every thirty (30) days, all tanks shall be monitored for releases using one of the methods listed in §§ 6008 through 6012, except heating oil USTs and tanks with a capacity of 550 gallons or less, may use either tank tightness testing, manual tank gauging or inventory control (statistical inventory reconciliation (SIR)) or any combination of these methods to meet the requirements of this section.

6003.4 A tank with a capacity of five hundred fifty (550) gallons or less may be tested by manual tank gauging, conducted weekly in accordance with § 6006.

6003.5 New or replaced underground storage tank systems, including systems replaced in accordance with the requirements of §§ 5902.5, 5902.6, 5902.7 and 5902.13, shall be constructed to include secondary containment and interstitial monitoring as set forth in §§5701.4, 5701.5, and 5701.6.

6003.6 Secondary containment systems on underground tanks installed or replaced after February 8, 2007 shall be checked for evidence of a release at least once every thirty (30) days using interstitial monitoring.

SOURCE: Final Rulemaking published at 40 DCR 7835, 7869 (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).