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 11-5-2-280.4-5.3 - Piping Trenches

Sampling is required whenever a piping trench is taken out of service or piping is replaced. However, repairs (see definition in Appendix H) or small changes to the piping system such as installation of new flex connectors or unions are not subject to the sampling requirements.

When both the tanks and piping are being removed and 50 feet or less of piping trench exists between the dispenser island sampling point and the nearest tank excavation sampling point, no additional sampling is required along the piping trench unless soil contamination along the piping trench is evident as shown in Figure 10.

Click Here To View Image