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 11-5-2-280.4-5.2 - Dispenser Islands
Sampling is required whenever a dispenser island is taken out of service or the piping associated with the island is closed or replaced. However, small changes to the piping system such as installation of new flex connectors or pipe nipples in order to set new dispensers are not subject to the sampling requirements. An island is considered to be any dispenser or series of dispensers that are oriented in a straight line. Therefore, several different dispense arrangements may exist that could be considered as one island. You should use your professional judgement to determine the most appropriate sampling scheme.
If the dispensers are located directly above the tanks and the tanks are also being permanently closed, no discreet dispenser island samples are necessary provided all of the dispensers are located within the perimeter of the tank bed.
