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)
Rule 11-5-2.4 - Leak Detection
Section 11-5-2.4-280.41 - Requirements for petroleum UST systems

Universal Citation: MS Code of Rules 11-5-2.4-280.41

Current through September 24, 2024

Owners and operators of petroleum UST systems must provide leak detection for tanks, piping, and ancillary equipment within secondary containment sumps as follows:

(a) Tanks. Tanks installed on or after October 1, 2008, must be monitored at least every 30 days for leaks in accordance with § 280.43(g). Tanks installed before October 1, 2008, must be monitored at least every 30 days for leaks using one of the methods listed in § 280.43(d) through (h) except that:

(1) UST systems that meet the performance standards in § 280.20 or § 280.21, and the monthly inventory control requirements in § 280.43(a) or (b), may use tank tightness testing (conducted in accordance with § 280.43(c)) at least every 5 years until December 22, 1998, or until 10 years after the tank is installed or upgraded under § 280.21(b), whichever is later;

(2) Tanks with capacity of 550 gallons or less may use weekly tank gauging (conducted in accordance with § 280.43(b) ).

(b) Piping. Underground piping that routinely contains regulated substances must be monitored for leaks in a manner that meets one of the following requirements:

(1) Pressurized piping. Underground piping that conveys regulated substances under pressure must be equipped with an automatic line leak detector conducted in accordance with § 280.44(a) except for life safety/critical function UST systems, in which case, an alternative method of leak detection must be approved by MDEQ; and

(i) Pressurized piping installed before October 1, 2008, must have an annual line tightness test conducted in accordance with § 280.44(b) or have monthly monitoring conducted in accordance with § 280.44(c) or § 280.44(d).

(ii) Pressurized piping installed on or after October 1, 2008, must be monitored at least once every 30 days for leaks in accordance with § 280.44(c).

(2) Suction piping. Underground piping that conveys regulated substances under suction must:

(i) Have a line tightness test conducted at least every 3 years and in accordance with § 280.44(b), or use a monthly monitoring method conducted in accordance with § 280.44(c) or § 280.44(d) if it was installed before October 1, 2008.

No release detection is required for suction piping that is designed and constructed to meet the following standards:

(A) The below-grade piping operates at less than atmospheric pressure;

(B) The below-grade piping is sloped so that the contents of the pipe will drain back into the storage tank if the suction is released;

(D) The check valve is located directly below and as close as practical to the suction pump; and

(E) A method is provided that allows compliance with paragraphs (b)(2)(iii) (B)-(D) of this rule to be readily determined.

(ii) Must be monitored at least every 30 days for leaks in accordance with § 280.44(c) if it was installed on or after October 1, 2008.

(c) Ancillary equipment in secondary containment sumps. Ancillary equipment with in secondary containment sumps where the containment sumps were installed on or after October 1, 2008, must be monitored at least every 30 day for leaks or ingress of water in accordance with § 280.45.

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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