Mississippi Administrative Code › Title 11 - Mississippi Department of Environmental Quality › Part 5 - Underground Storage Tank Regulations › Chapter 2 - Mississippi Commission on Environmental Quality Underground Storage Tanks Regulations Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks (UST) (Adopted March 22, 1989; Amended August 25, 2011, Last Amended August 23, 2018) › Appendix 11-5-2-280.1 - GUIDELINES FOR THE EVALUATION OF UNDERGROUND STORAGE TANK CATHODIC PROTECTION SYSTEMS › Section 11-5-2-280.1-2 - REGULATIONS › Section 11-5-2-280.1-2-2.1 - Rules

Current through June 25, 2024
Federal and state laws require that any component of a
						UST system that routinely contains product and is in contact with the soil must
						be protected from corrosion. If the UST component in question is of metallic
						construction and it is in contact with the soil and/or water, it must be
						cathodically protected. If it is cathodically protected it must also be coated
						with a suitable dielectric material if the metallic component in question was
						installed after December 22, 1988.
The rules also require that all cathodic protection
						systems must be evaluated within six months of installation/repair and once
						every three years thereafter. Consideration should be given to evaluating
						impressed current systems on an annual basis since these types of systems are
						more susceptible to failure or may be in need of adjustment on a more frequent
						basis in order to provide adequate cathodic protection.
The MDEQ UST regulations reference several industry
						codes and practices and a listing of these may be found in Appendix A of this
						document. Following are the pertinent paragraphs the UST rules that are related
						to cathodic protection:
280.12 Definitions
"Cathodic Protection" is a technique to prevent
						corrosion of a metal surface by making that surface the cathode of an
						electrochemical cell. For example, a tank system can be cathodically protected
						through the application of either galvanic anodes or impressed current.
"Cathodic protection tester" means a person who can
						demonstrate an understanding of the principles and measurements of all common
						types of cathodic protection systems as applied to buried or submerged metal
						piping and tank systems. At a minimum, such persons must have education and
						experience in soil resistivity, stray current, structure-to-soil potential, and
						component electrical isolation measurements of buried metal piping and tank
						systems.
"Corrosion expert" means a person who, by reason of
						thorough knowledge of the physical sciences and the principles of engineering
						and mathematics acquired by a professional education and related practical
						experience, is qualified to engage in the practice of corrosion control on
						buried or submerged metal piping systems and metal tanks. Such a person must be
						accredited or certified as being qualified by the National Association of
						Corrosion Engineers (NACE) or be a registered professional engineer who has
						certification or licensing that includes education and experience in corrosion
						control of buried or submerged metal piping systems and metal tanks.
Performance Standards for New UST Systems
(a)
(2) The
					 tank is constructed of steel and cathodically protected in the following
					 manner:
(i) The tank is coated with a
					 suitable dielectric material;
(ii)
					 Field-installed cathodic protection systems are designed by a corrosion expert;
(iii) Impressed current systems
					 are designed to allow determination of current operating status as required in
					 280.32 (c); and
(iv) Cathodic
					 protection systems are operated and maintained in accordance with 280.32.
Operation and Maintenance of Corrosion Protection
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.
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) Frequency. All cathodic protection
					 systems must be tested within 6 months of installation and at least every 3
					 years thereafter.
(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.