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 11-5-2-280.4-6.2 - Backfill Handling Options
Current through September 24, 2024
Typically, all backfill material is contaminated and should be handled as such until laboratory analysis proves otherwise. The following are the options allowed for handling the backfill material:
a. Dispose of in an approved landfill (Appendix B).
Conduct any sampling that may be required by the landfill and receive permission from the landfill you wish to utilize.
b. Stockpile on site and await the lab results of sampling.
All backfill material should be placed on and covered with an impervious material (plastic sheeting). If the analytical results of the backfill material are below the action levels of the UST Branch, the backfill material may be placed back into the excavation. If the results are above our limits, your options are as described in paragraphs a, d or e of this rule.
c. Sample the backfill material and return it to the excavation.
The backfill material may be returned to the excavation before the analytical results are obtained with the understanding that the backfill material may have to be re-excavated if the analytical results arc above the action levels of the UST Branch. If the results are above the action levels of the UST Branch, your options are as described in paragraphs a, d or e of this rule.
d. Aerate the backfill material on site.
If the analytical results indicate concentrations above the action levels of the UST Branch and the owner does not want to dispose of the backfill material in an approved sanitary landfill, the backfill material may be aerated on site. To aerate the backfill material, place the backfill material on an impervious material (plastic sheeting), spread the backfill material approximately one foot thick. Build a berm around the soil that will retain any rainwater and prevent any contamination from spreading. Cover the soil on rainy days; uncover the soil on sunny days. Disc or till the soil weekly. Contact a UST Branch Project Manager for instructions before initiating the aeration process.
e. Stockpile the backfill material at a different location.
Before this is done, approval must be obtained from the MDEQ Groundwater Division-Special Waste Section.
