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 11-5-2-280.4-7 - DEVIATIONS FROM MINIMUM SAMPLING REQUIREMENTS
Section 11-5-2-280.4-7.2 - Waiver of Sampling Requirements

While not generally a recommended practice, sampling requirements may be waived if the facility has monitoring wells as the method of leak detection and no evidence of a release has been noted. The UST Branch generally will only consider groundwater monitoring to grant a waiver. In order to request a waiver, submit the previous twelve months of monitoring well records at the same time the "Notice of Intent to Permanently Close UST System(s)" form is submitted and indicate you wish to have the sampling requirements waived.

However, if evidence of petroleum contaminated soil and/or groundwater is found during closure activities, samples must then be collected from the appropriate locations and analyzed as described in this guidance document.