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
Section 11-5-2-280.4-5.2.1 - Removal of Dispenser Islands - No Sidewall Contamination Apparent
Prior to beginning any sampling activity, all backfill materials must be removed from the excavation. If no contamination of the sidewalls is apparent, one soil sample must be collected from the floor of the excavation. The sample must be collected at a depth of one foot below the piping trench and into the native soil. The sample must be collected from the area of the floor that appears to be the most contaminated. If no area of the floor appears to be contaminated, the sample must be collected from the center of the excavation when the dispenser island is less than or equal to 50 feet in length as shown if Figure 8.
Two soil samples must be taken below each dispenser island if the island is more than 50 feet in length. The samples must be collected from beneath 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 contaminated although no more than 50 feet may exist between any two sample locations. If no area of the floor appears contaminated, the sample locations must be spaced equally along the length of the island and such that no more than 50 feet exists between any two sampling locations as shown in Figure 8.
