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) › Rule 11-5-2.2 - UST Systems: Design, Construction, Installation and Notification › Section 11-5-2.2-280.20 - Performance standards for new UST systems

Current through June 25, 2024
In order to prevent leaks due to structural failure,
					 corrosion, or spills and overfills for as long as the UST system is used to
					 store regulated substances, all owners and operators of new UST systems must
					 meet the following requirements.
(a)
Tanks.
Each tank must be properly designed and constructed,
				  and any portion underground that routinely contains product must be protected
				  from corrosion, in accordance with a code of practice developed by a nationally
				  recognized association or independent testing laboratory as specified below and
				  all new or replacement tanks installed on or after October 1, 2008, must have
				  secondary containment in accordance with § 280.20(a)(4):
(1) The tank is constructed of
				  fiberglass-reinforced plastic; or
(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);
(iv)
				  Cathodic protection systems are operated and maintained in accordance with
				  § 280.32; and
(v) The cathodic
				  protection systems meet the MDEQ "Guidance for the Evaluation of Underground
				  Storage Tank Cathodic Protection Systems" document or similar guidance as
				  approved by MDEQ or
(3)
				  The tank is of composite construction (steel clad with fiberglass-reinforced
				  plastic or other polymeric materials); or
(4) The tank is of secondary containment
				  construction. Secondarily contained tanks shall comply with the following:
(i) Prevent the release of regulated
				  substances to the environment for the operational life of the tank;
(ii) Prevent the ingress of water or other
				  external fluids into the interstitial space for the operational life of the
				  tank;
(iii) Allow for monitoring of
				  the interstitial space to detect any leak from the primary tank and ingress of
				  external fluids;
(iv) Be checked
				  for evidence of a leak and ingress of external fluids at least once every 30
				  days in accordance with § 280.43(g) and be repaired within 90 days of an
				  observed failure, or another timeframe as approved by MDEQ; and
(v) Be compatible with the substances stored
				  and external soil/fluids for the operational life of the tank; or
(5) The tank construction and
				  corrosion protection are determined by the MDEQ to be designed to prevent the
				  leak or threatened leak of any stored regulated substance in a manner that is
				  no less protective of human health and the environment than paragraphs (a)(1)
				  through (4) of this rule.