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 11-5-2-280.4-3 - SAMPLING PROCEDURES
Section 11-5-2-280.4-3-3.4 - Groundwater Sample Collection Procedures
Section 11-5-2-280.4-3-3.4.1 - Collecting Groundwater Samples for Gasoline (BTEX) Analysis

Universal Citation: MS Code of Rules 11-5-2-280.4-3-3.4.1

Current through September 24, 2024

For BTEX groundwater analysis, collect at least three (3) 40-ml samples from each sampling point.

1. Sampling containers should be pre-labeled before any sample collection begins.

2. Decontaminate bailer and use clean new string/line.

NOTE: In general, use a disposable bailer and not one that must be decontaminated between borings or wells in order to lessen the chance of cross-contamination.

3. Slowly lower the bailer into the water. Do not allow the bailer to free-fall.

4. Allow the bailer to go into the water as far as possible without touching the bottom of the boring and/or tank hole.

5. Remove the bailer from the water before it is completely immersed under the water.

6. Collect three aliquots:

a. transfer the sample from the bailer to amber 40-ml glass vials with Teflon-lined septum cap, leaving no head space;

b. each sample should be carefully poured down the inside of the vial to minimize turbulence;

c. verify no headspace by inverting the vial and tapping it gently to check for trapped air bubbles. If any are present, a new sample must be collected;

d. as a rule of thumb, it is best to gently pour the last few drops into the vial so that surface tension holds the water in a "convex meniscus". The cap is then placed on the vial and some overflow is lost, but air space in the bottle is eliminated;

e. Immediately store samples on ice and ship to the laboratory within 24 hours of collection.

Disclaimer: These regulations may not be the most recent version. Mississippi may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.

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