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 11-5-2-280.4 - GUIDELINES FOR THE PERMANENT CLOSURE OF PETROLEUM UNDERGROUND STORAGE TANK SYSTEMS
Section 11-5-2-280.4-5 - SAMPLING LOCATIONS FOR DISPENSER ISLANDS & PIPING
Section 11-5-2-280.4-5.1 - General Requirements
When performing a UST system closure, all piping must be removed from the ground or properly closed in place. However, if new underground tanks are installed to replace the tanks being closed, the existing piping may be utilized provided it is constructed of non-corrodible materials or coated and cathodically protected steel. If aboveground tanks are being installed, the existing piping may be utilized if it meets the corrosion protection requirements and all soil/groundwater sampling required for a piping closure in place is accomplished.
When closing piping in place, the goal is to render the piping unusable. Therefore, provided the piping is no longer usable, filling of all voids in the piping is not necessary. Pump a concrete slurry or other suitable inert solid material in the piping as full as practical and cap each end of the piping.
Below are several procedure examples to follow when you are only replacing piping or abandoning a dispenser island.
* I am only abandoning an island - the facility will remain operating as a UST facility. In this case, you must submit the "Notice of Intent to Permanently Close a UST System" and indicate on the form that only piping is being closed. The section of piping that supplied the abandoned dispenser island must also be closed in accordance with the requirements of this document.
* I am only replacing the piping - the facility will remain operating as a UST facility and all of the new piping will utilize the existing trenches/dispenser islands. In this case, you must submit the "Notice of Intent to Permanently Close a UST System" and indicate on the form that only piping is being removed. All dispenser islands/piping trenches must be closed in accordance with the requirements of this document.
* I am only replacing the tanks - the existing piping will be utilized. In this case, you must submit the "Notice of Intent to Permanently Close a UST System" and indicate on the form that only tanks are being closed. The tanks must be closed in accordance with the requirements of this document.
* I am only repairing the piping (please refer to Appendix H for the definition of "repair"). Repairs of piping are not subject to any of the UST closure requirements. However, if you discover contaminated soils and/or groundwater while conducting the repairs you must collect the appropriate soil and/or groundwater samples for laboratory analysis.
