PURPOSE: This rule contains the options for upgrading existing underground storage tanks for continued operation after December 22, 1998.

Editor’s Note: The secretary of state has determined that the publication of this rule in its entirety would be unduly cumbersome or expensive. The entire text of the material referenced has been filed with the secretary of state. This material may be found at the Office of the Secretary of State or at the headquarters of the agency and is available to any interested person at a cost established by state law. (1) Alternatives Allowed. No later than December 22, 1998, all existing underground storage tank (UST) systems must comply with one (1) of the following requirements:

1. (A) New UST system performance standards in 10 CSR 20-10.020;
2. (B) The upgrading requirements in sections (2)—(4) of this rule; or
3. (C) Closure requirements in 10 CSR 20-10.070—10 CSR 20-10.074, including applicable requirements for corrective action in 10 CSR 20-10.060—10 CSR 20-10.067.

1. (2) Tank Upgrading Requirements. Steel tanks must be upgraded to meet one (1) of the following requirements in accordance with a code of practice developed by a nationallyrecognized association or independent testing laboratory:

   1. (A) Interior Lining. A tank may be upgraded by internal lining if—

      1. 1. The lining is installed in accordance

with the requirements of 10 CSR 20-10.033; and

1. 2. Within ten (10) years after lining, and

every five (5) years after that, the lined tank is internally inspected and found to be structurally sound with the lining still performing in accordance with original design specifications;

1. (B) Cathodic Protection. A tank may be upgraded by cathodic protection if the cathodic protection system meets the requirements of the performance standards for new UST systems in 10 CSR 20-10.020(1)(A)2. B.—D. and the integrity of the tank is ensured using one (1) of the following methods:

   1. 1. The tank is internally inspected and

assessed to ensure that the tank is structurally sound and free of corrosion holes prior to installing the cathodic protection system;

1. 2. The tank has been installed for less

than ten (10) years and is monitored monthly for releases in accordance with release detection methods 10 CSR 20-10.043(1)(D)—(H);

1. 3. The tank has been installed for less

than ten (10) years and is assessed for corrosion holes by conducting two (2) tightness tests that meet the requirements of release detection method 10 CSR 20-10.043(1)(C). The first tightness test must be conducted prior to installing the cathodic protection system. The second tightness test must be conducted between three and six (3—6) months following the first operation of the cathodic protection system; or

1. 4. The tank is assessed for corrosion

holes by a method that is determined by the department to prevent releases in a manner that is no less protective of human health and the environment than paragraphs (2)(B)1.—3. of this rule; and

1. (C) Internal Lining Combined With Cathodic Protection. A tank may be upgraded by both internal lining and cathodic protection if—

   1. 1. The lining is installed in accordance

with the requirements of 10 CSR 20-10.033; and

1. 2. The cathodic protection system meets

the requirements of 10 CSR 20-10.020(1)(A) 2.B.—D. (3) Piping Upgrading Requirements. Metal piping that routinely contains regulated substances and is in contact with the ground must be cathodically protected in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory and must meet the requirements of 10 CSR 20-10.020(1)(B)3.B.—D.

1. (4) Spill and Overfill Prevention Equipment. To prevent spilling and overfilling associated with product transfer to the UST system, all existing UST systems must comply with new UST system spill and overfill prevention equipment requirements specified in 10 CSR 20-10.020(1)(C).

2. (5) The following codes and standards may be used to comply with this rule:

   1. (A) American Petroleum Institute Publication 1631, Recommended Practice for the Interior Lining of Existing Steel Underground Storage Tanks;
   2. (B) National Association of Corrosion Engineers Standard RP-02-85, Control of External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid Storage Systems; and
   3. (C) American Petroleum Institute Publication 1632, Cathodic Protection of Underground Petroleum Storage Tanks and Piping Systems.

AUTHORITY: sections 319.105, RSMo (Cum. Supp. 1989) and 644.026, RSMo (Cum. Supp. 1993).* Original rule filed April 2, 1990, effective Sept. 28, 1990. *Original authority: 319.105, RSMo (1989) and 644.026, RSMo (1972), amended 1973, 1987, 1993.