PURPOSE: This rule contains the requirements for corrosion protection systems.

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. (1) All owners and operators of steel underground storage tank (UST) systems with corrosion protection must comply with the following requirements to ensure that releases due to corrosion are prevented for as long as the UST system is used to store regulated substances.

   1. (A) All corrosion protection systems must be operated and maintained to continuously provide corrosion protection to the metal components of that portion of the tank and piping that routinely contain regulated substances and are in contact with the ground.

   2. (B) All UST systems equipped with cathodic protection systems must be inspected for proper operation by a qualified cathodic protection tester in accordance with the following requirements:

      1. 1. Frequency. All cathodic protection

systems must be tested within six (6) months of installation and at least every three (3) years after that or according to another reasonable time frame established by the department; and

1. 2. Inspection criteria. The criteria that

are used to determine that cathodic protection is adequate as required by this section must be in accordance with a code of practice developed by a nationally recognized association listed in section (2) of this rule.

1. (C) UST systems with impressed current cathodic protection systems must also be inspected every sixty (60) days to ensure the equipment is running properly; and

2. (D) For UST systems using cathodic protection, records of the operation of the cathodic protection must be maintained (in accordance with 10 CSR 20-10.034) to demonstrate compliance with the performance standards in this rule. These records must provide the following:

   1. 1. The results of the last three (3)

inspections required in subsection (1)(C) of this rule; and

1. 2. The results of testing from the last

two (2) inspections required in subsection (1)(B) of this rule.

1. (2) National Association of Corrosion Engineers Standard RP-02-85, Control of External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid Storage Systems, may be used to comply with paragraph (1)(B)2. of this rule.

AUTHORITY: sections 319.105, RSMo (Cum. Supp. 1989) and 644.041, RSMo (1986).* Original rule filed April 2, 1990, effective Sept. 28, 1990. 10 CSR 20-10

*Original authority: 319.105, RSMo (1989) and 644.041, RSMo (1972), amended 1973.