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 11-5-2.5 - Leak Reporting, Release Reporting, Investigation, and Confirmation
Section 11-5-2.5-280.50 - Reporting of leaks and suspected releases

(a) The discovery by owners and operators or others of released regulated substances at the UST site or in the surrounding area (such as the presence of free product or vapors in soils, basements, sewer and utility lines, and nearby surface water);

(b) The discovery by owners and operators or others of regulated substances within the interstitial space of a double-walled tank or pipe. In the case of containment sumps, reporting is required only if the amount of regulated substances is equal to or greater than one eighth inch or if there is evidence of a leak and it appears the containment sump is not liquid tight;

(c) Unusual operating conditions observed by owners and operators (such as the erratic behavior of product dispensing equipment, the sudden loss of product from the UST system, or an unexplained presence of water in the tank), unless system equipment is found to be defective but not leaking, and is immediately repaired or replaced;

(d) The discovery by owners and operators or others of failures of UST system equipment (such as failed spill buckets, failed line leak detectors, failed sensors, etc.), if the failed UST system equipment is not repaired and re-tested within 24 hours of the discovery of the failure; and

(e) Monitoring results from a leak detection method required under § 280.41 and § 280.42 that indicate a leak may have occurred unless: