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

PUBLISHER’S NOTE: The secretary of state has determined that the publication of the entire text of the material which is incorporated by reference as a portion of this rule would be unduly cumbersome or expensive. This material as incorporated by reference in this rule shall be maintained by the agency at its headquarters and shall be made available to the public for inspection and copying at no more than the actual cost of reproduction. This note applies only to the Substance Storage Tanks

reference material. The entire text of the rule is printed here.

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 an electrolyte, including but not limited to soil, backfill, and/or water.
   2. (B) All UST systems equipped with cathodic protection systems must be inspected for proper operation by a NACE International certified, Steel Tank Institute certified, or International Code Council

2. (ICC) appropriately certified cathodic protection tester in accordance with the following requirements:

   1. 1. Frequency. To confirm that the system

is operating properly and providing adequate protection, all cathodic protection systems must be tested within six (6) months of installation and at least triennially 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 (CP) 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. A. Inspection reports must document

the testing method used, the testing standard referenced, the CP tester, and the CP tester’s qualifications.

1. B. Inspection reports must include a

site sketch, potential readings, and the location where the readings were made.

1. C. For impressed current systems, the

inspection report must document continuity data and how voltage (IR) drops other than those across the structure/electrolyte interface were considered or accounted for in determining adequate protection.

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.

   1. 1. Rectifier log reports must include rel-

evant system data, including but not limited to amperage readings, voltage readings, hour meter, and indicator light, where available.

1. 2. Any indication of deviations from

previous rectifier logs or rectifier readings or the most recent cathodic protection system inspection of the rectifier or cathodic protection system, such as variances in current reading or indicator light, must be appropriately investigated.

1. (D) For UST systems using cathodic protection, records of the operation of the cathodic protection system must be maintained (in accordance with 10 CSR 26-2.034) 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) The following codes and standards may be used to comply with this rule:

   1. (A) NACE International RP 0285-2002, Corrosion Control of Underground Storage Tank Systems by Cathodic Protection, revised 2002. This document is incorporated by reference without any later amendments or modifications. To obtain a copy, contact NACE International, Box 218340, Houston, TX 77218-8340, (713) 492-0535, www.nace.org; or
   2. (B) NACE International TM0101-2001, Standard Test Method, Measurement Techniques Related to Criteria for Cathodic Protection on Underground or Submerged Metallic Tank Systems, 2001 edition. This document is incorporated by reference without any later amendments or modifications. To obtain a copy, contact NACE International, Box 218340, Houston, TX 77218-8340, (713) 492-0535, www.nace.org; or
   3. (C) Steel Tank Institute Cathodic Protection Testing Procedures for sti-P3 USTs, R051, January 2006. This document is incorporated by reference without any later amendments or modifications. To obtain a copy, contact the Steel Tank Institute, 944 Donata Court, Lake Zurich, IL 60047, (708) 438-8265, www.steeltank.com; or
   4. (D) Steel Tank Institute Recommended Practice for the Addition of Supplemental Anodes to sti-P3 USTs, R972, December 2010. This document is incorporated by reference without any later amendments or modifications. To obtain a copy, contact the Steel Tank Institute, 944 Donata Court, Lake Zurich, IL 60047, (708) 438-8265, www.steeltank.com.

2. (3) If cathodic protection is being used to protect all or part of a UST system from corrosion, and the electric system energizing the cathodic protection has been off, unhooked, or damaged for more than ninety (90) days, the owner/operator must—

   1. (A) Conduct an integrity test, documenting adequate tank shell integrity and thickness, as required in 10 CSR 26-2.021(3)(B); and
   2. (B) Have a corrosion expert or design engineer re-evaluate the UST system, cathodic protection system, and surrounding structures and design and/or make changes to the existing cathodic protection system to meet the standards in 10 CSR 26-2.020(1)(A)2.B.–D.
   3. (C) The owner/operator may request an additional ninety (90) days to repair the systems by submitting a request, including the justification for the extension; or
   4. (D) Permanently close the tank, in accordance with 10 CSR 26-2.060 through 10 CSR 26-2.064.
3. (4) If a cathodic protection system test indicates that the system is not operating properly or does not provide adequate protection, as defined by the testing method used, and the system is not repaired or does not pass a retest within ninety (90) days, or if a required cathodic protection system test is not conducted, the owner/operator must comply with the requirements outlined in section (3) of this rule.

AUTHORITY: sections 319.105 and 319.107, RSMo 2000, and section 319.137, RSMo Supp. 2010.* This rule originally filed as 10 CSR 20-10.031. Original rule filed April 2, 1990, effective Sept. 28, 1990. Moved and amended: Filed April 15, 2011, effective Dec. 30, 2011. *Original authority: 319.105, RSMo 1989; 319.107, RSMo 1989, amended 1994; and 319.137, RSMo 1989, amended 1993, 1995, 2004.