6007.1 A release detection method that uses tank tightness testing shall meet the requirements of this section.

6007.2 An owner or operator may use tank tightness testing as the sole method of release detection only for heating oil tanks.

6007.3 Tank tightness testing shall be capable of detecting a leak rate of one tenth of a gallon per hour (0.1 gal/hr) from any portion of the tank that regularly contains or conveys a regulated substance, and shall account for the effects of the following factors when detecting a leak rate:

(a) Thermal expansion or contraction of the regulated substance;

(b) Vapor pockets;

(c) Tank deformation;

(d) Evaporation and condensation; and

(e) The location of the water table at the facility.

6007.4 An owner or operator shall conduct a tightness test in accordance with this section to satisfy the installation, upgrade, and/or repair requirements set forth in Chapter s 57 through 59 before operating the newly installed, upgraded, and/or repaired UST system.

6007.5 An owner or operator shall use tightness testing in accordance with this section to confirm a suspected release under § 6203.

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 67 DCR 1778 (February 21, 2020).