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
Section 11-5-2-280.4-5.3.1 - Removal of Piping - No Sidewall Contamination Apparent
Prior to beginning any sampling activity, all backfill materials must be removed from the piping trench excavation. If no contamination of the sidewalls is apparent, soil samples must be collected from the floor of the excavation. The samples must be collected from the floor of the piping trench at least one foot into the native soil. The samples must be collected from the areas of the floor that appears to be the most contaminated although no more than 50 feet may exist between any two sampling locations. If no area of the floor appears contaminated or if it is uniformly contaminated, the samples must be collected along the length of the piping trench such that no more than 50 feet exists between any two sampling locations as shown in Figure 11.
