1. (a) No owner or operator of an UST system shall use or operate any tank or piping that routinely contains product beyond its life expectancy as determined in accordance with this section. Prior to the last day of the life expectancy of any such tank or piping, the owner or operator shall close such tank or piping in accordance with the closure requirements specified in section 22a-449(d)-107 of the UST regulations.

2. (b) From the date of installation, the life expectancy for a tank or piping that routinely contains product shall be as follows:

   1. (1) For a tank or piping constructed of cathodically protected steel, or a flex connector made of steel, life expectancy is 30 years;

   2. (2) For a tank or piping that does not meet the requirements of subdivision (3) of this subsection and is made of fiberglass-reinforced plastic, any other non-metallic material, or a tank constructed of steel and clad or jacketed with a non-corrodible material, life expectancy is 30 years, except that for a tank or piping that meets the following criteria, life expectancy is 40 years:

      1. (A) The tank and piping is used for the storage of petroleum only;
      2. (B) The tank is constructed of:

3. (i) single-walled fiberglass-reinforced plastic or composite steel, or(ii) double-walled fiberglass-reinforced plastic or composite steel;

   1. (C) The tank has a striker plate beneath each access point present since time of installation;
   2. (D) Piping is non-metallic;
   3. (E) The tank or piping has piping containment sumps and under dispenser containment sumps that are liquid tight and monitored;
   4. (F) For a single-walled tank, the tank has passed a tightness test within 12 months, before or after, May 7, 2025, and passes a tightness test annually thereafter until permanently closed;
   5. (G) Except for a double-walled tank using brine and vacuum, the double walled tank has passed an interstitial test within 12 months, before or after May 7, 2025, and passes an interstitial test annually thereafter until permanently closed. Such interstitial test shall meet the requirements of the Petroleum Equipment Institute, Recommended Practice 1200-12;
   6. (H) The tank or piping is not located within an aquifer protection area or within 1,000 feet of a potable well, not including potable wells on the site where the tank is located; and(I) Line leak testing, when required by section 22a-449(d)-104 of the UST regulations, is conducted every 6 months.

   7. (3) For a double-walled tank or double-walled piping made of fiberglass- reinforced plastic, any other non-metallic material, or a tank constructed of steel and clad or jacketed with a non-corrodible material:

      1. (A) Using interstitial monitoring that does not monitor both the primary containment and secondary containment such as a sensor in a dry space, life expectancy is 40 years; or(B) Using continuous interstitial monitoring that monitors both the primary containment and secondary containment such that the inner and outer walls are continuously monitored using technology such as inert gas, or liquid, or under constant vacuum, life expectancy is 45 years; and(4) For a tank or piping constructed of any substance not identified in subdivisions (1) to (3), inclusive, of this subsection, life expectancy is 15 years.

4. (c) If the month and year of the installation of either a tank or piping that routinely contains product cannot be reasonably determined, the owner or operator shall immediately:

   1. (1) Discontinue use of such tank or piping; and(2) Permanently close such tank or piping in accordance with section 22a-449(d)-107 of the UST regulations.
5. (d) Notwithstanding the provisions of subsection (b) of this section, the period of life expectancy for either tanks or piping that routinely contains product, may upon request, or upon the commissioner’s own initiative, be modified by the commissioner. The commissioner may request any information the commissioner deems necessary in responding to a request. Any modification by the commissioner under this subsection may include any conditions the commissioner deems appropriate.

(Effective July 28, 1994; Amended May 7, 2025)