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 11-5-2-280.4-6 - BACKFILL SAMPLING
Section 11-5-2-280.4-6.1 - General Requirements

All excavated backfill material must be sampled unless it is disposed of in an approved sanitary landfill. This is because the soil samples collected from the native soil of the tank excavation may not be representative of the contamination levels of the backfill materials.

A minimum of one soil sample is required to be collected for each 100 cubic yards of material. Sample the backfill material as soon as possible after stockpiling. The samples must be collected at a point at least one foot into the stockpile following the same sample collection procedures as for any other soil sampling. The backfill samples must be analyzed for the same constituents as the tank excavation samples.