PURPOSE: This rule prevents releases caused by chemical action on the underground storage tank system by the stored regulated substance.

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

1. (1) Owners and operators must use an underground storage tank (UST) system made of or lined with materials that are compatible with the substance stored in the UST system. If a lining is installed for compatibility purposes, it must be maintained and inspected in accordance with 10 CSR 26-2.021(3)(A).
2. (2) Owners and operators must notify the department at least thirty (30) days prior to switching to a regulated substance containing greater than ten percent (10%) ethanol and/or greater than twenty percent (20%) biodiesel.

3. (3) Owners and operators may use one (1) or more of the following methods to demonstrate UST system compatibility with the regulated substance stored:

   1. (A) Certification or listing of UST system components by a nationally recognized, independent testing laboratory for use with the regulated substance stored; or
   2. (B) Equipment or component manufacturer approval. The manufacturer’s approval must be in writing, indicate an affirmative statement of compatibility and functionality, specify the range of product blends with which the component is compatible, and be from the equipment or component manufacturer; or
   3. (C) Another method determined by the department to be no less protective of human health and the environment than the methods listed in subsection (A) or (B) of this section.

4. (4) Owners and operators storing alcohol blends may use the following codes to comply with this rule:

   1. (A) American Petroleum Institute Recommended Practice 1626, Storing and Handling Ethanol and Gasoline-Ethanol Blends at Distribution Terminals and Service Stations, 2010 Edition with 2012 Addendum. This document is incorporated by reference without any later amendments or modifications. To obtain a copy, contact the American Petroleum Institute, 1220 L Street NW, Washington, DC 20005, (202) 682-8000, www.api.org/standards/; or
   2. (B) Other standards or publications approved by the department.

AUTHORITY: sections 319.105 and 319.137, RSMo 2016.* This rule originally filed as 10 CSR 20-10.032. Original rule filed April 2, 1990, effective Sept. 28, 1990. Moved and amended: Filed April 15, 2011, effective Dec. 30, 2011. Amended: Filed Aug. 15, 2016, effective May 30, 2017. *Original authority: 319.105, RSMo 1989 and 319.137, RSMo 1989, amended 1993, 1995, 2004.