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

Current through June 25, 2024
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.